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Home My WebLink About20240732.tiffRECEIVED MAR 27 2024 112 CONSTRUCTION MATERIALS PERMIT AMENDMENT APPLICATION NO.2 (AM -02) FOR DRMS PERMIT NO. M-2015-030 CHAVERS MINING RESOURCE 12367 COUNTY ROAD 8 FORT LUPTON, WELD COUNTY, COLORADO Prepared by: ASPHALT SPECIALTIES CO., INC 10100 DALLAS STREET HENDERSON, COLORADO 80640 303-289-8555 • Fax 303-289-7707 ASPHALT SPECIALTIES CO. March 2024 i?ub\ic. tReoino ems:FLCmt),Au.(7R-1Ko1DAIMK'), toi vzo _ PnLb Jsa 63)a1 1 a4 WELD COUNTY COMMISSIONERS 2024-0732 Chavers Mining Resource DRMS Permit No. M-2015-030 Amendment No. 2 (AM -02) March 2024 Page ii TABLE OF CONTENTS Section Page INTRODUCTION 1 6.4.3 EXHIBIT C - PRE -MINING AND MINING PLAN MAP(S) OF AFFECTED LANDS 2 6.4.4 EXHIBIT D - MINING PLAN 3 6.4.4 (A) DESCRIPTION OF THE METHOD(S) OF MINING 3 6.4.4 (B) EARTHMOVING 3 6.4.4 (C) WATER DIVERSIONS AND IMPOUNDMENTS 3 6.4.4 (D) SIZE OF AREA(S) TO BE WORKED ON AT ANY ONE TIME 4 6.4.4 (E) APPROXIMATE TIMETABLE FOR MINING OPERATION 4 6.4.4 (F) STRATIGRAPHY 5 6.4.4 (F)(i) Nature of Deposit 5 6.4.4 (F)(ii) Nature of Stratum beneath Deposit 5 6.4.4 (G) COMMODITIES MINED/EXTRACTED AND INTENDED USE 5 6.4.4 (H) INCIDENTAL PRODUCTS MINED/EXTRACTED AND INTENDED USE 5 6.4.4 (I) EXPLOSIVES 5 6.4.4 (J) DIMENSIONS OF EXISTING OR PROPOSED ROADS 5 6.4.5 EXHIBIT E - RECLAMATION PLAN 6 6.4.5 (1) PREPARATION OF THE RECLAMATION PLAN 6 6.4.5 (2) RECLAMATION PLAN REQUIREMENTS 6 6.4.5 (2)(a) Description of Reclamation Plan 6 6.4.5 (2)(b) Land Uses in the Vicinity 8 6.4.5 (2)(c) Reclamation Performance Standards 8 6.4.5 (2)(d) Revegetation Plan 13 6.4.5 (2)(e) Schedule for Implementation 14 6.4.5 (2)(f) Description of Reclamation Details 14 6.4.6 EXHIBIT F - RECLAMATION PLAN MAP 16 6.4.7 EXHIBIT G - WATER INFORMATION 17 6.4.7(1) IF OPERATION IS NOT EXPECTED TO DIRECTLY AFFECT SURFACE OR GROUNDWATER 17 6.4.7(2) IF OPERATION IS EXPECTED TO DIRECTLY AFFECT SURFACE OR GROUNDWATER 17 6.4.7(2)(a) Surface Water and Groundwater Systems Affected by Operation 17 6.4.7(2)(b) Known Aquifers 17 6.4.7(2)(c) Dewatering Operations and Runoff 17 6.4.7(3) PROJECT WATER REQUIREMENTS 17 6.4.7(4) REPLACEMENT WATER SOURCES 17 6.4.7(5) NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES) PERMIT 18 Chavers Mining Resource DRMS Permit No. M-2015-030 Amendment No. 2 (AM -02) March 2024 Page iii TABLE OF CONTENTS (CONTINUED) Section Page 6.4.12 EXHIBIT L - RECLAMATION COSTS 19 6.4.12(1) COST ESTIMATE 19 6.4.12(2) ADDITIONAL DATA TO SUBSTANTIATE COST ESTIMATE 20 6.4.13 EXHIBIT M - OTHER PERMITS AND LICENSES 21 6.4.17 EXHIBIT Q - PROOF OF MAILING NOTICES TO BOARD OF COUNTY COMMISSIONERS AND CONSERVATION DISTRICT 22 6.4.18 EXHIBIT R - PROOF OF FILING WITH COUNTY CLERK & RECORDER 23 6.4.18 EXHIBIT S - PERMANENT MAN-MADE STRUCTURES 24 ATTACHMENTS ATTACHMENT 1 AFFIDAVIT FOR CLEAN AND INERT MATERIAL BACKFILL ATTACHMENT 2 GROUNDWATER MONITORING AND MITIGATION PLAN ATTACHMENT 3 INTEGRATED NOXIOUS WEED MANAGEMENT PLAN Chavers Mining Resource DRMS Permit No. M-2015-030 Amendment No. 2 (AM -02) March 2024 Page 1 INTRODUCTION This Amendment No. 2 (AM -02) has been prepared for the Asphalt Specialties Co., Inc. (ASCI) Chavers Mining Resource (Site), Colorado Division of Reclamation, Mining, and Safety (DRMS) Permit No. M-2015-030, to revise the reclamation plan from the currently approved sealed water storage reservoir to rangeland use after backfill and expand the affected area within the permit boundary for surface use disturbances. The Site is located at 12367 County Road 8, Fort Lupton, Weld County, Colorado in Section 18, TIN, R66W. The format is based on the Mineral Rules and Regulations of the Colorado Mined Land Reclamation Board for the Extraction of Construction Materials, Effective July 15, 2019 (Construction Materials Rule, 2019), Rule 6: Permit Application Exhibit Requirements, Section 6.4 Specific Exhibit Requirement -112 Reclamation Operation. The following is a list of the specific exhibits being amended, partially or entirely, in this application. 6.4.3 Exhibit C — Pre -Mining and Mining Plan Map(s) of Affected Lands 6.4.4 Exhibit D — Mining Plan 6.4.5 Exhibit E — Reclamation Plan 6.4.6 Exhibit F — Reclamation Plan Map 6.4.7 Exhibit G — Water Information 6.4.12 Exhibit L — Reclamation Costs 6.4.13 Exhibit M — Other Permits and Licenses 6.4.17 Exhibit Q — Proof of Mailing Notices to Board of County Commissioners and Conservation District 6.4.18 Exhibit R — Proof of Filing with County Clerk & Recorder 6.4.19 Exhibit S — Permanent Man-made Structures Per Construction Materials Rule No. 1, Section 1.10.1(1), applicable information which would duplicate previous submittals has not been included in this application. The following table lists where the currently approved exhibits not being amended can be found: 6.4 Specific Exhibit Requirements -112 Reclamation Operation Current Approved Version 6.4.1 Exhibit A - Legal Description AM -01 (2017) 6.4.2 Exhibit B — Index Map AM -01 (2017) 6.4.8 Exhibit H — Wildlife Information AM -01 (2017) 6.4.9 Exhibit I — Soils Information AM -01 (2017) 6.4.10 Exhibit J — Vegetation Information AM -01 (2017) 6.4.11 Exhibit K — Climate Original Application (2016) 6.4.14 Exhibit N — Source of Legal Right to Enter AM -01 (2017) 6.4.15 Exhibit O - Owners(s) of Record of Affected Land (Surface Area) and Owners of Substance to be Mined AM -01 (2017) 6.4.16 Exhibit P — Municipalities Within Two Miles AM -01 (2017) Chavers Mining Resource DRMS Permit No. M-2015-030 Amendment No. 2 (AM -02) March 2024 Page 2 6.4.3 EXHIBIT C - PRE -MINING AND MINING PLAN MAP(S) OF AFFECTED LANDS The following Exhibit C — Pre -Mining and Mining Plan Map(s) (i.e., Exhibits C -1, C-2, and C-3) of Affected Lands have been revised to reflect updates/changes from the previous submittal based on current conditions, as applicable, for: (a) Updated — All adjoining surface owners of record; (b) Not Applicable — No change/update from previous submittal. (c) Updated — The existing topography of the area with contour lines of sufficient detail to portray the direction and rate of slope of the affected land. (d) Updated — The total area to be involved in the operation, including the area to be mined and the area of affected lands. (e) Not Applicable — No change/update from previous submittal. (f) Not Applicable — No change/update from previous submittal. (g) Updated — Permanent man-made structures contained on the area of affected land and within two hundred (200) feet of the affected land . (h) Not Applicable — No change/update from previous submittal. (i) Not Applicable — No change/update from previous submittal. I -- -.-- 1{nffmnnrrermrlf7mnTrmnrrfimnrtfilT�nnfTiTtinnif�T1rrnalri7ligoirrin �.'--� _ - .0.. 1 \ - -..r" %" \ F CONCRETE L. PL.!<I•ir ' F \ \ \ \ \ \ \\ \ \ \ - I S. • I�r 1 ttttr'f., + errr7 III I'I.:})•�� I.... "`V '441414".411."4444414 I4l44-rH rlrr• rlu:ii+l:1) ,r:; REVISIONS Asphalt Specialties Co., Inc. 345 W. 62nd Ave. Denver, CO 80216 Phone: 303-289-8555 Fax: 303-289-7707 - 1 If r+er,+�rrllr,rr \" tr++ r.Lw U LLUJ u u LI.g,I t u xtu:_ LI Llu,{.1 u LL u.I. CHAVERS MINING RESOURCE REGULAR 112 PERMIT M-2015-030 AM -02 WELD COUNTY. CO ASPHALT SPECIALTIES CO., INC • EXISTING OIL k GAS WELL HEAD EXISTING UTILITY POLE EXISTING BURIED TELEPHONE LINE EXISTING BURIED GAS LINE EXISTING BARBED WIRE FENCE - EXISTING EDGE OF GRAVEL ROAD EXISTING RIVER EXISTING PROPERTY BOUNDARY EXISTING ADJOINING PARCEL BOUNDARY - - EXISTING SECTION LINE EXISTING RIGHT OF WAY LINE EXISTING MAJOR CONTOUR LINE SET EXISTING MINOR CONTOUR LINE 1E1 NE EXISTING 100YR FLOODPLAIN BOUNDARY (FEMA PANEL M080266098]C) • E% I. RIP RAP SPUR DIKE/WEIR ST • RES (COOT) • =El PERMIT BOUI IDARY AM PI AMAMI I TO ME PERMIT AREA PERMANENT MAN-MADE STRUCTURES WITHIN 200FT OF THE AFFECTED AREA EXHIBIT C-1 PRE -MINE PLAN MAP 1 OF 1 7 • • \ \ • \ • • 1 �\ • • • DENVER WATER LUPTON LAKES INLET OUTLET FACILITIES SITE ACCESS t • �ERMIT BOUNDARY 0.0P' 2 X11 • i r e AFFECTED AREA BOUNDARY • I '••••.� I � I ! L i PROPERTY BOUNDARY 440I _.- --,64 i -' .44.X41. 4444 00 •,,400 '4.4 4'/4' l .� le US$411 ILL • • 1 I "hisus' 'WI SE CORNER OF THE SW 1/4 SECTION 18, TIN, R66W REVISIONS DESCRIPTION i ., • — — •r I— 4 *1O4* s` O4 e• tliss �" ,1% **s Mowsmare sae* - • a, +a- _ aI .. less_ EXISTING ALLUVIAL WELL 444 Wash BACKFILL STAGING S. a Plant• , :•_ male•_•_• ._•_._._•...._•_.+ APPROVED ,-.= ...... less -_-...1.. to ••• ♦• .• I. I i iSpU7,4„ // / ,/ 4.6 DISCHARGE OUTFALL 003-A MW�'n rnreerrinmerrnmrrinvrnr rrrrr n•rrrn≥ -- - - -4 „ �i. , 4%r♦ Q S. ♦ r��it 1.401 4 •Ilit ♦ ***Eta_ ya' %604. �•ablij I••••�1wi•_ lornoi .• itak RECYCLE 0.0PERATI0N •. & BACKFILL -•.. al STORAGE r .,..,•. • •AREA •._•less• ......• Imm-•-. • • • 1`111 1111 '�� y_��_ _.. #7 '•• • •. • .• • • We •.• •• • ••• • .• i •• •••. I ••• • • f • .• • • ' most 11111 1.1j11 BACKFILL ' STAGING • ••••5• • • •. $ as aa -- a- hi--Mw-3 au�` 50' �1 `1�Fsu'r----ter I 1 way 7 Total Area of Current Excavation = 26 acres Total Exposed Groundwater In Pit=7.8 acres In Ponds = 1.9 acres • PERMITPERMITIFEMMeAt �. •• • ♦ #4io • • 1•••••.f I11 50' AFFECTED AREA BOUNDARY • bMW-6 • 1• • PROPERTY BOUNDARY MAP LEGEND EXISTING EDGE OF PAVEMENT EXISTING ANADARKO PIPELINES EXISTING OIL & GAS WELL HEAD A EXISTING UTILITY POLE • - EXISTING BURIED TELEPHONE UNE -4i-694- EXISTING BURIED GAS UNE EXISTING BARBED VARE FENCE EXISTING EDGE OF GRAVEL ROAD EXISTING RIVER !- EXISTING DRAINAGE DITCH EXISTING PROPERTY BOUNDARY EXISTING ADJOINING PARCEL BOUNDARY EXISTING SECTION LINE - - - -- - EXISTING RIGHT OF WAY UNE nvoiribitivo EXISTING RIP RAP SPUR DIKE/WEIR STRUCTURES (CDOT) • w am a ot PERMIT BOUNDARY EXTENT OF MINING CELL BOUNDARY hull1111 AFFECTED AREA BOUNDARY PROPOSED DIRECTION OF MINING SERVICE ROADS (GRAVEL) MONITOR WELL EXTENT OF MINING AREA = -75 ACRES AFFECTED AREA = -87 ACRES PERMIT BOUNDARY = -95 ACRES Ej= CURRENT EXCAVATION EXTENT = RECYCLE & BACKFILL MATERIAL STOCKPILES ED = TOPSOIL STOCKPILES I ■ I 1 = MINING COMPLETE Q = DISCHARGE OUTFALL 111111 1 = 400 FEET FROM RIVER LINE I DISCHARGE OUTFALL 001-A /-tee rep // 0' 150' 300' 375' 450' SCALE: 1" = 150' Asphalt Specialties Co., Inc. 345 W. 62nd Ave. Denver, CO 80216 Phone: 303-289-8555 Fax: 303-289-7707 CHAVERS MINING RESOURCE REGULAR 112 PERMIT M-2015-030 AM -02 FORT LUPTON, CO EXHIBIT C-2 MINE PLAN MAP SCALE 1"=150' DWG NO REV 1.0 PREPARED FOR ASPHALT SPECIALTIES CO., INC. DRAWNSY CHECKED BY DATE 3/5/2024 SHEET O DENVER WATER LUPTON LAKES INLET OUTLET FACILITIES SITE ACCESS r �I / 4 7 11 / 1\ 1 II t 7- 1 I I / PROPERTY BOUNDARY AFFECTED AREA BOUNDARY �morn — - • • It_IaISO- •▪ , et 44 / �' de 4* t �tttt�44 fide I 40 'SS,tt 11t1'• `•/t 'PERMIT BOUNDARY e• r .01 S / / / pv i *ad • .,.,__._,_,,• •i .....,. . Backfilled 4 acres CONCRETE PLANT SE CORNER OF THE SW 1/4 SECTION 18, TIN, R66W REVISIONS REV DESCRIPTION DATE APPROVED 4-'A(c�E 11 acres 4-, s0Cf p41TT� MIN-4rr rn'Y'rrTOrrrrr rnnnrrrru rTVIT `�, �„�„� �„� r �„� ,� iii ♦` t ilia 'ye ` ♦ ,` ii•i �• ` i iiii111 ` 1111 ea%•f 4%0 M -5 111111 -16 acres Asphalt Specialties Co., Inc. 345 W. 62nd Ave. Denver, CO 80216 Phone: 303-289-8555 Fax: 303-289-7707 - 2 acres PREPARED FOR RECYCLE OPERATION & BACKFILL STORAGE AREA /iL/d.tiialYaiYm CHAVERS MINING RESOURCE REGULAR 112 PERMIT M-2015-030 AM -02 FORT LUPTON, CO istit magt fairs ftis ` aft outtm Nee " .. ......... 111 1".4 I I I I PROPERTY BOUNDARY J -1 1 PERMIT/ERAIEFAI}f. ♦ ♦♦♦ AFFECTED AREA BOUNDARY ♦♦ ♦ MIEN • ♦♦ 1 • ♦ • • MW -6 �qY++ • �♦• I4 I 50 1 � MAP LEGEND -111 CAS -34 i EXISTING EDGE OF PAVEMENT EXISTING ANADARKO PIPELINES EXISTING OIL & GAS WELL HEAD EXISTING UTIUTY POLE - EXISTING BURIED TELEPHONE LINE - -+-w-4.+- EXISTING BURIED GAS UNE EXISTING BARBED WIRE FENCE EXISTING EDGE OF GRAVEL ROAD EXISTING RIVER - <- <- F- EXISTING DRAINAGE DITCH -- EXISTING PROPERTY BOUNDARY EXISTING ADJOINING PARCEL BOUNDARY EXISTING SECTION UNE EXISTING RIGHT OF WAY UNE EXISTING RIP RAP SPUR DIKE/WEIR STRUCTURES (COOT) - - - - - PERMIT BOUNDARY EXTENT OF MINING CELL BOUNDARY i I rrttiiI AFFECTED AREA BOUNDARY PROPOSED DIRECTION OF MINING SERVICE ROADS (CRAWL) • MONITOR WELL EXTENT OF MINING AREA = -75 ACRES AFFECTED AREA = -87 ACRES PERMIT BOUNDARY = -95 ACRES = Current Excavation To Be Backfilled = Current Mining Area To Remain Open = 400 Feet From River Line - Areas to be backfilled within one (1) year of excavation = Future Excavation Area 1 = Future Excavation Area 2 = Future Excavation Area 3 = Anticipated General Direction of Mining // f r U1 0' 150' 300' 375' 450' SCALE: 1" = 150' EXHIBIT C-3 GENERAL DIRECTION OF MINING MAP SCALE 1"=150' DWG NO REV ASPHALT SPECIALTIES CO., INC. DRAWN BY CHECKED BY DATE 2/15/2024 SHEET 1 OF 1 Chavers Mining Resource DRMS Permit No. M-2015-030 Amendment No. 2 (AM -02) March 2024 Page 3 6.4.4 EXHIBIT D - MINING PLAN 6.4.4 (A) DESCRIPTION OF THE METHOD(S) OF MINING Mining conducted employs conventional aggregate mining techniques including the use of excavators and loaders to excavate topsoil, overburden, and aggregate material. Mining is accomplished by utilizing dewatering trenches around the perimeter of the toe of mining slope to facilitate dry mining. Haul trucks move materials to be processed at a fixed gravel plant located on -site. Finished materials are stockpiled where they are loaded into trucks for removal off -site or to the concrete plant located in the southeastern corner of the site. 6.4.4 (B) EARTHMOVING The mining operation strips topsoil and overburden to expose the underlying raw aggregate material deposit. Topsoil is stockpiled on -site and seeded to establish a vegetated cover to minimize erosion until future reclamation use. Overburden material will be utilized as part of the mine backfill. Overburden material will typically be stockpiled temporarily (i.e., less than one [1] year) and used as backfill of earlier mine excavation areas. However, should mining operations call for overburden materials to be stored over one (1) year, the stockpiles will be seeded with reclamation seed mix to establish a vegetated cover to minimize erosion until future backfill use. The exposed raw aggregate material deposit will be excavated and processed. The equipment used to conduct the earthmoving activities may include dozers, loaders, excavators, articulated haul trucks, water trucks, and scrapers for the mining and earth moving operations. Aggregate processing equipment includes feeders, a fixed plant gravel plant with crusher and screens, sand screw, wash plant, conveyors, stackers, and other miscellaneous processing equipment. 6.4.4 (C) WATER DIVERSIONS AND IMPOUNDMENTS The following discusses water diversions and impoundments at the Site: Mine Pit Dewatering: Mining of the Site utilizes dewatering trenches around the perimeter of the toe of mining slope to facilitate dry mining. Water is directed into a pump basin (i.e., sedimentation pond) within the pit to settle out fines prior to being pumped for discharge (via enclosed pipe or dewatering trench) to the South Platte River at approved Outfalls 001-A or 003-A. Wash Plant: Wash plant water is recycled in a continuous loop using on -site sedimentation ponds. Water for the wash plant is pumped from an on -site sedimentation pond. The used wash plant water is directed to another on -site sedimentation pond to allow suspended sediment to settle out. The settled wash plant water is then transferred back to the initial sedimentation pond to be re -used by the wash plant. Settled fines from used wash plant process water sedimentation pond will be excavated and used as backfill. Chavers Mining Resource DRMS Permit No. M-2015-030 Amendment No. 2 (AM -02) March 2024 Page 4 Industrial Well: In addition to sand and gravel pit mining, a concrete production plant is located at the Site. The concrete production plant utilizes groundwater from the on -site industrial alluvial well (Well Permit No. 80120-F) located near the southeast corner of the Site. ASCI maintains annual replacement water lease(s) and Substitute Water Supply Plan (SWSP) approved by the Division of Water Resources (DWR) to account for out -of -priority depletions resulting from the water diversions and impoundments. 6.4.4 (D) SIZE OF AREA(S) TO BE WORKED ON AT ANY ONE TIME The maximum pit size to be worked on at any one-time is approximately 26 acres (i.e., current extent of the pit). The current depth of the excavation ranges between 19 to 28 feet below ground surface (ft bgs). Backfilling will occur concurrently with mining activities. The historic high groundwater elevation is 4,910.33 feet above mean sea level (ft amsl) in monitoring well MW -3 which is located near the midpoint of the Site. This indicates that a midpoint baseline backfill elevation of 4,912 ft amsl will provide sufficient coverage to eliminate exposed groundwater in the pit (i.e., 1.67 feet). Cut and fill calculations to balance the affected area to the midpoint backfill elevation of 4,912 ft amsl are presented in the table below. Cut/Fill Calculation to Eliminate Exposed Groundwater Fill Volume (Required) 764,398 CYs Cut Volume (Currently On -Site) 680,718 CYs Off -site Material Required 83,680 CYs The primary source of backfill material will be clean, uncontaminated material consistent with the Construction Material Rule No. 1, Section 1.1 (22) that will be imported from off -site. ASCI obtains this material from contractors who generate the material as part of construction projects in the vicinity (e.g., excavations for new housing). Based on 2022, ASCI will obtain sufficient off - site material to offset the volume required to eliminate exposed groundwater in approximately one (1) year; however, annual off -site volumes are expected to increase as construction continues to expand in the Northern Front Range area. Off -site material received will be temporarily stored at backfill staging areas around the excavation (e.g., typically no longer than one to two weeks) or processed as part of the recycling operation on -site prior to being placed in the pit. Backfill material will be managed separately from topsoil and overburden stockpiles at the Site. 6.4.4 (E) APPROXIMATE TIMETABLE FOR MINING OPERATION Approximately 75 of the 87 acres of affected area at the Chavers Mining Resource are mineable. Of the 75 mineable acres, approximately 53 acres have been or are currently being mined. The Chavers Mining Resource DRMS Permit No. M-2015-030 Amendment No. 2 (AM -02) March 2024 Page 5 mining operation is estimated to last for another 6 to 8 years; however, this could vary depending upon market conditions. The current excavation is shown on Exhibit C-2. The extents of excavation for the northern half of the Site have been reached. Current excavation areas within 400 feet of the South Platte River will be backfilled within one (1) year of approval of AM -02. As shown on Exhibit C-3, backfill of the pit will occur on the northern portion of the Site while the anticipated general direction of mining will occur on the southern half of the Site. Future mining excavations within 400 feet of the South Platte River will be backfilled within one (1) year of excavation. 6.4.4 (F) STRATIGRAPHY 6.4.4 (F)(i) Nature of Deposit The average overburden thickness is approximately 3.5 to 4.0 ft. The topsoil portion of the overburden typically ranges from 12 to 24 -inches in depth. The sand and gravel deposit varies in thickness, but the average thickness is approximately 28 feet. It varies from sandy lean clay in the upper zones, to coarse clayey sand and sand with gravel nearer the bedrock. The gravel typically found in this area has a history for being processed into high -quality aggregate construction materials including concrete and asphalt. 6.4.4 (F)(ii) Nature of Stratum beneath Deposit The strata underlying the sand and gravel deposit is a claystone bedrock. 6.4.4 (G) COMMODITIES MINED/EXTRACTED AND INTENDED USE The primary commodity is sand and gravel to be used for the construction industry. 6.4.4 (H) INCIDENTAL PRODUCTS MINED/EXTRACTED AND INTENDED USE There are no incidental commodities. 6.4.4 (I) EXPLOSIVES No explosives will be used for the mining operation. 6.4.4 (J) DIMENSIONS OF EXISTING OR PROPOSED ROADS No existing or proposed roads are associated with the mining operation. Chavers Mining Resource DRMS Permit No. M-2015-030 Amendment No. 2 (AM -02) March 2024 Page 6 6.4.5 EXHIBIT E - RECLAMATION PLAN 6.4.5 (1) PREPARATION OF THE RECLAMATION PLAN This revised reclamation plan includes specific details related to final reclamation of the Site as rangeland use after backfilling. Specific information contained in this document includes final grading, seeding, fertilizing, revegetation, topsoiling, and weed control. 6.4.5 (2) RECLAMATION PLAN REQUIREMENTS 6.4.5 (2)(a) Description of Reclamation Plan Reclamation of the Site will return the land to rangeland use after backfilling. The benefits of this plan include: Creating usable property for rangeland use. Increasing the visual attractiveness of the Site and surrounding area. Providing private entities an alternative for disposal of clean materials (e.g., basement over -excavations for housing developments). Increased employment opportunities created by the backfill operations and reclamation of this Site. Should ASCI decide to sell the property, this reclamation plan will allow for long-term flexibility when evaluating future development options. This could result in revenue to the City of Fort Lupton and the State in future taxes pending the redevelopment plan by a new owner. Of the 95 -acre permit area for the Chavers Mining Resource, approximately 75 of the acres are mineable. ASCI is expanding the affected area from ±75 acres to ±87 acres for additional surface use disturbances only (no change to the ±75 acres to be mined). With this amendment (AM -02), reclamation of all ±75 acres will be backfilled and the entire ±87 acres will be reclaimed for rangeland use. Backfill Material: Backfill material will consist of on -site overburden, on -site crusher fines, wash plant fines, and imported clean, uncontaminated material consistent with the Construction Material Rule No. 1, Section 1.1 (22). It is ASCI's intention to use primarily native/natural earth and aggregate materials (e.g., sand, gravel, and rock) for backfill material. It is especially important to ASCI that only clean, uncontaminated materials are delivered to the Site. All backfill materials generated off -site will be delivered by reputable pre -approved contractors that have a history of working with ASCI and will adhere to the Site rules and guidelines. ASCI will collaborate with the contractors to obtain assurances that backfill materials are free of contaminants and are native or natural materials. ASCI will exercise every effort to learn as much as Chavers Mining Resource DRMS Permit No. M-2015-030 Amendment No. 2 (AM -02) March 2024 Page 7 reasonably possible about the backfill materials received at the Site to ensure that those materials are free of contaminants. All backfill materials will be inspected upon entry to the Site and while being unloaded using visual and/or olfactory methods to ensure no potentially contaminated materials are received. If evidence of possible contamination is observed, loads will be rejected and material will not be allowed to be left on -site by the contractor. No contaminated materials will be accepted or allowed on -site. Any asphalt or concrete materials received will continue to be diverted to the recycled aggregate materials operation at the Site. Backfilling Process: The reclamation plan for the Chavers Mining Resource is to backfill the Site at least to the minimum requirement of one (1) foot above the historic high measured water table elevation, but not to exceed pre -mining elevations. After an area of the property has been mined of sand and gravel, backfilling operations will begin once they can be safely conducted. ASCI will conduct backfill operations concurrent with mining operations whenever possible. The exposed pit area will constantly shift as concurrent mining and backfill operations occur, but ASCI will not exceed an exposed active mining and backfill pit area of approximately 26 acres at any one-time. The time to complete backfill will vary upon market conditions but is anticipated to be completed within approximately three (3) years after mining is complete. Groundwater will continuously be pumped until backfill above static water level is complete. Backfill material will be imported to the Site with articulated dump trucks and/or highway dump trucks. Backfill material will be temporarily stored at backfill staging areas around the excavation (e.g., typically no longer than one to two weeks) or processed as part of the recycling operation on -site prior to being placed in the pit. Backfill material will be pushed into the excavation and/or placed and spread in one (1) to two (2) -foot lifts using haul trucks, bulldozers, excavators, and/or loaders. Compaction will take place during the filling process, as haul trucks and heavy equipment traverse over the fill material. Temporary excavation slopes and temporary stockpiled material slopes may range from 1:1 to 3:1 depending on soil conditions in the mine. All slopes will be maintained for site safety and to minimize material erosion. Backfill will be complete when the entire Site is within approximately 1 - 2 feet of final grade as indicated by ASC1 survey (rough grade). Grading and Topsoil: Once the backfill is near rough grade across the Site, the surface contours of the affected area will be graded to approximately twelve (12) inches below the final grade across the Site. After contour grading is complete, a minimum topsoil cover twelve (12) inches thick will be placed on top of the backfill to reach topographic elevations at least one (1) foot above the historic groundwater high, but not to exceed pre - mining elevations (i.e., final grade). The final grade will control water runoff, erosion, and siltation to protect all areas outside the mine and allow surface drainage to flow gently as sheet flow to the northeast, consistent with pre -development drainage. Chavers Mining Resource DRMS Permit No. M-2015-030 Amendment No. 2 (AM -02) March 2024 Page 8 To ensure grading requirements are met, elevations will be checked periodically by ASCI during the reclamation process. This will continue until the final grade is achieved with backfill materials and topsoil cover. A final topography survey will be conducted by ASCI after topsoil has been placed, but before seeding occurs to ensure that the general Site topography does not exceed pre -mining elevations and is sloped for positive drainage. All surveys will be conducted by aerial drone. The allowable vertical variation will be approximately one (1) foot given that the final topography will be slightly undulating in areas to mimic the original landform. Once topography across the Site is within acceptable limits, ASCI will proceed with the revegetation process. The approximate maximum final contours of the Site are shown on Exhibit F - Reclamation Plan Map. Seeding and Growth Monitoring: The topsoil layer will be seeded with a native grass seed mix to return the property to rangeland use. Growth of the grass will be monitored quarterly until established to ensure a successful transition back to rangeland use. 6.4.5 (2)(b) Land Uses in the Vicinity Reclamation to rangeland land is a positive and useful post -closure land use that is compatible with surrounding uses which include multiple sand and gravel mines, oil and gas industry sites, and other rangeland/agricultural lands. 6.4.5 (2)(c) Reclamation Performance Standards The following sections describe how this reclamation plan meets applicable requirements of Construction Materials Rule No. 3, Section 3.1 Reclamation Performance Standards. RULE 3: Section 3.1- Reclamation Performance Standards 3.1.1 Establish Post Mining Land Use: The post -mining land use shall return the property to rangeland use. The Site is currently zoned Agricultural by the City of Fort Lupton. 3.1.2 Reclaiming Substituted Land: Not Applicable 3.1.3 Time Limited and Phased Reclamation: A phased reclamation approach will be implemented. Reclamation will occur in two (2) phases: Reclamation Phase 1: Backfill — Reclamation Phase 1 will backfill excavated with on -site overburden, crusher fines, wash plant fines, and imported clean, uncontaminated material. Backfill will occur concurrently with mining whenever possible; however, backfill will continue after mining is complete. Reclamation Phase 1 will be complete when backfill of the entire Site is within approximately 1 - 2 feet of final grade as indicated by ASCI survey. Based on the current estimates, Reclamation Phase 1: Backfill is anticipated to be complete within approximately three (3) years after mining is complete; however, this is subject to change pending Chavers Mining Resource DRMS Permit No. M-2015-030 Amendment No. 2 (AM -02) March 2024 Page 9 future market conditions. ASCI will complete backfill to the minimum requirement of one (1) foot above the historic high measured water table elevation, but not to exceed pre -mining elevations within 5 -years of the date the extraction of material and stockpile removal is complete. Should completion of Reclamation Phase 1 not be feasible within five (5) years from the date ASCI informs the DRMS that all material extraction and stockpile removal is complete, an extension will be submitted based on the remaining backfill volume required at that time. ■ Reclamation Phase 2: Grading, Topsoil, Seeding, and Growth Monitoring — In Reclamation Phase 2, any existing structures will be removed, Site contours for the ±87 acres of affected area will be graded to approximately 1 - 2 feet below final grade, and a minimum final cover topsoil layer twelve (12) inches thick will be placed across the affected area. Changes to topography will be made as necessary until the final grade is within acceptable limits (a minimum of one [1] foot above the historic high measured water table elevation, but not to exceed pre -mining elevations). Once final grade is achieved, site seeding, fertilizing, and mulching will occur in the subsequent fall season. Growth and progress of the grass will be monitored quarterly to ensure a successful transition back to rangeland use. It is anticipated that a successful transition to rangeland will occur within five (5) years from the date ASCI informs the DRMS that Reclamation Phase 2 has commenced. 3.1.4 Public Use: The public will not be allowed on the land while mining and reclamation activities are in progress. After reclamation is complete and the bond released, the public will only have access to the land adjacent to the South Platte River that will be dedicated to the City of Fort Lupton. 3.1.5 Reclamation Measures — Materials Handling: Measures will be taken to meet the following requirements. (1) The Site will be graded to a minimum of one (1) foot above the historic high measured water table elevation, but not to exceed pre -mining elevations. The approximate maximum final contours are shown on Exhibit F - Reclamation Plan Map. (2) No toxic or acid-forming materials will be included in backfill material. All backfill materials will be compacted during the filling process. (3) Grading will be done to control erosion and siltation on the affected lands and protect outside areas from slides. No high walls will be left exposed. (4) Once backfill activities are complete at the Site, grading will occur as quickly as feasible. (5) No acid-forming or toxic producing materials are associated with materials mined at the Site. On -site refuse is maintained by contracted vendors to control unsightliness and protect the South Platte River drainage system. Chavers Mining Resource DRMS Permit No. M-2015-030 Amendment No. 2 (AM -02) March 2024 Page 10 (6) No drill or auger holes, adits, or shafts are associated with the mining operation. All monitoring wells will be properly abandoned prior to completing reclamation. (7) Contouring of the Site will result in maximum slope(s) that are compatible with surrounding conditions and selected land use. (8) The grade of the land will allow for use of farm machinery to traverse the Site. (9) This document, Amendment No. 2 (AM -02), serves as ASCI's notice of intent to backfill using clean, uncontaminated materials generated outside of the approved permit area in addition to materials generated within the permitted area. (a) The location of backfill sourced off -site will occur in the remaining ±71 mineable acres. (b) The approximate maximum total volume of backfill material is estimated to be ± 3.0 million cubic yards. (c) A signed affidavit certifying that the material is clean and inert, as defined by Rule 1.1(22) is provided as Attachment 1 of this document. (d) Backfill of material generated off -site will commence in 2022/2023 and end at the completion of Reclamation Phase 1. (e) The backfilled Site will result in a post -mining configuration that is compatible with the post -mining land use (i.e., rangeland) being requested for approval by this Amendment No. 2 (AM -02). (f) Backfill material will be pushed into the excavation and/or placed and spread in one (1) to two (2) -foot lifts using haul trucks, bulldozers, excavators, and/or loaders. Compaction will take place during the filling process, as haul trucks and heavy equipment traverse over the fill material. (10) All mined material not compatible for off -site use (e.g., fines) will be backfilled to prevent any release of unauthorized fine material to the surface drainage system. (11) No unauthorized release of pollutants to groundwater will occur from materials mined, handled, or used as backfill within the permit area. No toxic or acid producing materials are used in the mining process. 3.1.6 Water — General Requirements: ASCI will minimize disturbances to the prevailing hydrologic balance and water quality of systems (surface and groundwater) both during and after mining and reclamation phases. (1) Hydrology and Water Quality: ASCI will continue to comply with applicable Colorado water laws and regulations to ensure no injury occurs to existing water rights and maintain water quality standards of the Water Quality Control Commission (WQCC). ASCI will continue to maintain the appropriate permits and plans (e.g., CDPS Discharge Permit and approved SWSPs) along with replacement water lease(s) Chavers Mining Resource DRMS Permit No. M-2015-030 Amendment No. 2 (AM -02) March 2024 Page 11 sufficient to cover out -of -priority depletions throughout the mining and reclamation process. Additional details regarding hydrology & water quality are provided in the Groundwater Monitoring and Mitigation Plan (Attachment 2). (2) No earthen dams will need to be constructed. (3) All surface areas, including spoil piles, will be stabilized to effectively control erosion using appropriate erosion control measures. 3.1.7 Groundwater — Specific Requirements: (1) The Site is located within Classified Area: City of Fort Lupton Wellfield, Weld County (WQCC Regulation No. 42). Water quality standards applicable to the Site are presented in the Groundwater Monitoring and Mitigation Plan (Attachment 2). (2) Not Applicable - The Site is located within a classified area. (3) Not Applicable - The Site is located within classified area. (4) Procedures for establishing compliance with standards promulgated by the WQCC are presented in the Groundwater Monitoring and Mitigation Plan (Attachment 2). (5) Details of the groundwater quality monitoring program for the Site are presented in the Groundwater Monitoring and Mitigation Plan (Attachment 2). (6) Monitoring wells MW -4, MW -5, and MW -6 will serve as the Point of Compliance wells for the Site. Details of the groundwater quality monitoring program for the Site are presented in the Groundwater Monitoring and Mitigation Plan (Attachment 2). (7) Details of the groundwater quality monitoring program for the Site are presented in the Groundwater Monitoring and Mitigation Plan (Attachment 2). (8) By implementing the groundwater quality monitoring program for the Site presented in the Groundwater Monitoring and Mitigation Plan (Attachment 2), ASCI will be able to demonstrate existing and reasonably potential future uses of groundwater are protected. (9) As detailed in the Groundwater Monitoring and Mitigation Plan (Attachment 2), ASCI will provide a written report within five (5) working days when there is evidence of groundwater discharges exceeding applicable groundwater standards or permit conditions imposed to protect groundwater quality. 3.1.8 Wildlife: No threatened or endangered species are present at the Site. (1) Wildlife habitat types currently present include pastureland and the South Platte River riparian corridor. The riparian corridor is outside the mining and backfill areas. (2) Neither habitat creation nor habitat management is part of the reclamation. The land will be returned to rangeland use. Chavers Mining Resource DRMS Permit No. M-2015-030 Amendment No. 2 (AM -02) March 2024 Page 12 3.1.9 Topsoiling 116(4)(g): (1) Topsoil is maintained on the Site in locations segregated from other spoil piles. All current and future topsoil stockpiles will maintain a vegetative cover to prevent erosion. (2) No woody vegetation is present within affected areas. (3) Topsoil stockpiles are in locations and configurations to minimize erosion and disturbance. (4) If necessary, relocation of topsoil stockpiles will be submitted for approval by way of technical revision. (5) Topsoil will be replaced and graded to mimic pre -mining conditions. No graded slopes with the potential for slippage zones are planned. (6) ASCI is following MLRB and DRMS requirements regarding topsoil suitability at the Site. (7) Reclamation of the Site to rangeland will utilize fertilizers and/or soils amendments, as needed. (8) Vegetative piles will be removed from the Site as part of final reclamation. 3.1.10 Revegetation 116(4)(f): (1) All areas will be revegetated for long-lasting coverage that is capable of self - regeneration using native grasses and forbs. Additional details are provided in Section 6.4.5 (2)(d) Revegetation Plan. (2) Reclamation will not include forest planting. (3) Land will be restored to slopes commensurate for rangeland use and capable for livestock to traverse. (4) Revegetation will consist of native grasses and forbs to provide for the greatest probability of success. Grazing will not occur until revegetation has been established. (5) ASCI will employ appropriate techniques of site preparation to ensure a diverse and long-lasting vegetative cover (e.g., discing, crimping, ripping, mowing, mulching, soil amendments, cover crops, and/or fertilizers). (6) ASCI will monitor progress of revegetation and implement weed control practices as appropriate for any areas infested by noxious weed species. (7) As necessary, temporary dirt access roads and/or fire lanes will be constructed through areas to be planted for planting crews, supervision, and inspection. (8) ASCI will implement final reclamation planting after all other uses of the property are complete. Chavers Mining Resource DRMS Permit No. M-2015-030 Amendment No. 2 (AM -02) March 2024 Page 13 (9) If adverse characteristics of the surface, not feasibly remedied by artificial measures, would seriously inhibit plant growth, planting may be delayed depending upon natural corrective processes over a ten-year period. 3.1.11 Buildings and Structures 116(4)(r): No building or structures are anticipated to be left on -site or constructed as part of the reclamation plan. 3.1.12 Signs and Markers: (1) Throughout the reclamation process, ASCI will maintain a sign at the entrance to the facility and clearly visible from the road with the following information: 1) Name of Operator; 2) Statement that a reclamation permit has been issued by the MLRB; and 3) Permit Number. (2) Throughout the reclamation process, ASCI will maintain monuments/markers clearly identifying the affected area boundaries (3) No alternative plan for identifying affected area boundaries is anticipated. 3.1.13 Spill Reporting: ASCI will notify DRMS of any toxic or hazardous substance spills, including spills of petroleum products, within the permit area that would also be required to be reported to Colorado Department of Public Health and Environment (CDPHE) or other federal, state, and/or local government agency. (1) ASCI will notify DRMS within 24 -hours from when any spill is reported to other agency(ies) with authority over the spill. (2) ASCI will include any relevant information known at the time to assist DRMS in assessing the seriousness of spill impacts. 6.4.5 (2)(d) Revegetation Plan The anticipated method of revegetation seeding will be by drill seeding. The recommended species composition for the reclamation seed mixture is presented below. Species (Variety) Rate (pis/acre) Native or Introduced Warm or Cool Season Grass Thickspike wheatgrass (Critana) 8.0 to 10.0 Native Cool Sideoats grams (Vaughn) 5.0 to 7.0 Native Warm Switchgrass (Nebraska -28) 4.0 to 6.0 Native Warm Alfalfa (Nomad) 3.0 to 5.0 Introduced N/A Total 20.0 to 28.0 Both Both Notes: pls = Pure Live Seed Chavers Mining Resource DBMS Permit No. M-2015-030 Amendment No. 2 (AM -02) March 2024 Page 14 Based on this seed mixture, an application rate of approximately 20.0 to 28.0 pls/ac will be used. Due to the common use of these grass species in the area, the availability of viable seeds in sufficient quantities is not considered to be an issue. Soil will be disced prior to seeding. Fertilizer be utilized in conjunction with seeding. A standard application of fertilizer will be used and applied at an appropriate rate (e.g., 250 lbs./acre). The total area to be seeded and fertilized is approximately 75 acres. Seeding and fertilizing will be completed as soon as possible after the overburden soil is backfilled, smoothed to conform to the reclamation topography, and the final layer of topsoil is placed and disced. Optimal periods of seeding are in the fall, before the first freeze (before November 1st) or in the spring from late -March up to April 30th. A standard application of straw mulch will be used and applied at an appropriate rate (e.g., 2 tons/acre) to the approximately 75 acres. Following revegetation, weed management strategies will be implemented to facilitate and achieve native grassland. Quarterly inspections to monitor revegetation progress and identify weed infestations will be conducted until the reclamation bond is released. ASCI will implement cultural, mechanical, and biological control methods including an aggressive mowing program to prevent the growth and establishment of weeds as mandated by Colorado State Law (C.R.S. Title 35 Article 5.5 Colorado Noxious Weed Act). If needed, chemical/herbicide application will be applied to further control weed infestations. 6.4.5 (2)(e) Schedule for Implementation Reclamation backfill will occur concurrently with mining wherever possible to backfill material into previously mined areas. Temporary stockpiling of backfill materials may occur for short durations. Reclamation Phase 1: Backfill will be completed as soon as possible after mining is complete, but no later than 5 -years from notifying DRMS that extraction of material and stockpile removal is complete. Based on the current estimates, Reclamation Phase 1: Backfill is anticipated to be complete within approximately three (3) years after mining is complete; however, this is subject to change pending future market conditions. ASCI will complete backfill within 5 -years of the date the extraction of material and stockpile removal is complete. Reclamation Phase 2: Grading, Topsoil, Seeding, and Growth Monitoring will be completed as soon as possible after backfilling is complete, but no later than 5 -years from notifying DRMS that backfill Reclamation Phase 1: Backfill is complete. 6.4.5 (2)(f) Description of Reclamation Details (i) Final Grading — Reclamation of affected lands at the Site will be graded to the minimum requirement of one (1) foot above the historic high measured water table elevation, but not to exceed pre -mining elevations. The slope gradient is anticipated to range from 0.1% (minimum) to 1% (maximum). The approximate maximum final contours of the site are shown on Exhibit F - Reclamation Plan Map. Chavers Mining Resource DRMS Permit No. M-2015-030 Amendment No. 2 (AM -02) March 2024 Page 15 (ii) Seeding — Information regarding seeding (e.g., types, mixtures, quantities, and expected times for seeding) is presented in Section 6.4.5 (2)(d) Revegetation Plan. (iii) Fertilization — Information regarding fertilization (e.g., type, mixtures, quantities, and time of application) is presented in Section 6.4.5 (2)(d) Revegetation Plan. (iv) Revegetation — Information regarding revegetation (e.g., type of grasses, location, etc.) is presented in Section 6.4.5 (2)(d) Revegetation Plan. (v) Topsoil — A minimum of twelve (12) inches of topsoil will be placed across the affected area and re -seeded as part of the Site reclamation. Chavers Mining Resource DRMS Permit No. M-2015-030 Amendment No. 2 (AM -02) March 2024 Page 16 6.4.6 EXHIBIT F - RECLAMATION PLAN MAP The following Exhibit F - Reclamation Plan Map has been revised to show: (a) The expected physical appearance of the area of the affected lands after reclamation is complete including topographic contour lines after final grading to return the affected lands to the maximum extent of pre -mining elevations. (b) Portrayal of the final land use as rangeland. { •1 PROPERTY EKAJNUARY SO' s�GaFf .7,7:40 •- .. —--'ZImmlmmprim RRTnllrcm.QT111n1 TIV0IMl7I'RI.'�L:?PIrP?!IISIffiI}nl IIIbRfnLItIL111LT'$LEp)IyryImmTTift l v — \ l \ err'. FACILITIES DENVER WATER LUPTON ��• ,',,` ,� • ' w ••• ,•I• �� f'RO!'E T1V LAKES INLET AND OUTLET �� •`, E3=711N17ARY 111, IIII]��Jl'I wr i-1 .II _ I,rl.iryrryll r 1 i iE1�u,1.0 W � TRAIL DEDICATION Slope = 0.001 Mt w - �,,• TO CITY OF FORIF LUPTON 1 w w w W NI, 4, 4 I OU W J w POTENTIAL FUTURE w OIL & GAS WELL �. 1 Rangeland Use _4 - 0I 14 1 � • ICI 1 I. J El I I _ I -.-_ _ W _ �� = w — ,.1... _ ery�IyuTMUMi1 r+Iu..Iwuuw"L' -- " STATE JIIC1fWAY 85 —_ SE CORNER OF THE SW 1/4 llll SmCtIEfl IK, 11H, R66M w1l DRAINAGE FLOW PATH — w;°w •PrROPOSED CULVERT REV REVISIONS DESCRIPTION DATE APPROVED ASPHALT SPECIALTIES CO., INC. 345 W. 62nd Ave. Denver, CO 80216 Phone: 303-289-8555 Fax: 303-289-7707 PREPARED FOR - wPOTENTIAL FUTURE OIL Sc GAS WELL w Rangeland Use DRAINAGE FLOW PATH -- .7 I . CHAVERS MINING RESOURCE 112 CONSTRUCTION MATERIALS PERMIT AMENDMENT FORT LUPTON, CO ASPHALT SPECIALTIES CO., INC. PER T4I DOI.INTARY MAP LEGEND EXISTING EDGE OF PAVEMENT EXISTING KERR MCGEE PIPELINES N EXISTING OIL & GAS WELL HEAD Al- EXISTING UTILITY POLE --•-•-•- EXISTING BURIED TELEPHONE UNE -4.-- °"- EXISTING BURIED GAS UNE EXISTING BARBED WIRE FENCE - - EXISTING EDGE OF GRAVEL ROAD EXISTING RIVER • ) EXISTING RIP RAP SPUR DIKE/WEIR • ''STRUCTURES (COOT) - - -EXISTING PROPERTY BOUNDARY -----EXISTING ADJOINING PARCEL BOUNDARY - EXISTING SECTION UNE - - - - - - EXISTING RIGHT OF WAY UNE -EXISTING MAJOR CONTOUR ONE 10FT EXISTING MINOR CONTOUR UNE 2FT A MONITOR WELLS LUPTON LAKES INLET AND OUTLET FACILITY STRUCTURE (DENVER WATER) PROPOSED PERMIT BOUNDARY - - PROPOSED MINING OMIT - BOUNDARY PROPOSED MAJOR CONTOUR - 1DFT PROPOSED MINOR CONTOUR - 2FT PROPOSED TRAIL DEDICATION TO CITY OF FORT LUPTON 11111111111111111, Al TFCTT D..1...11,1,041E f - - PRCPOSEC, T0PSOL. Rf9L,LI NEIII RE -VEGETATION AREA (-74 ACRES) - RECLAMATION NOTES 1 BACKFILL OIL R GAS OPERATION CONCURRENTLY IMTH MINING OPERATIONS 2 REPLACE TOPSOIL TO APPROXIMATE DEPTH OF 12 INCHES 3 RE -SEED SOIL REPLACEMENT AREAS WITH MIX INDICATED IN EXHIBIT E 4 IMPLEMENT WEED CONTROL AS INDICATED IN EXHIBIT E O' 150' 150' 375' 450' SCALE) 1" F 150' EXHIBIT F RECLAMATION PLAN MAP 1"=150' DRAWN BY GRG DWG NO 2/1/2024 Chavers Mining Resource DRMS Permit No. M-2015-030 Amendment No. 2 (AM -02) March 2024 Page 17 6.4.7 EXHIBIT G - WATER INFORMATION 6.4.7(1) IF OPERATION IS NOT EXPECTED TO DIRECTLY AFFECT SURFACE OR GROUNDWATER Not applicable. 6.4.7(2) IF OPERATION IS EXPECTED TO DIRECTLY AFFECT SURFACE OR GROUNDWATER 6.4.7(2)(a) Surface Water and Groundwater Systems Affected by Operation With this Amendment (AM -02), no change will occur to the surface water and groundwater systems directly affected previously identified. Operations at the Chavers Mining Resource affect both surface water associated with the South Platte River located to the west of the mine and groundwater associated with the South Platte River alluvial aquifer (i.e., uppermost aquifer). Details of the groundwater quantity and quality monitoring program for the Site are presented in the Groundwater Monitoring and Mitigation Plan (Attachment 2). 6.4.7(2)(b) Known Aquifers South Platte River alluvial aquifer (unnamed aquifer). 6.4.7(2)(c) Dewatering Operations and Runoff Mine process water, which includes groundwater from the dewatering operations and stormwater that collects in the mine pit, is directed into a settling basin within the pit to allow fine sediments to settle out before being pumped for discharge to the South Platte River. ASCI will maintain a topography at the Site to direct stormwater runoff from disturbed areas, piled material, and operating surfaces that is not collected in the mine pit to areas within the permit boundary where the water can percolate into the ground. 6.4.7(3) PROJECT WATER REQUIREMENTS ASCI submits SWSPs annually to the Colorado Division of Water Resources (DWR) for approval to refine the estimated project water requirements each year based upon the anticipated site conditions as mining and/or reclamation progresses. The current SWSP is approved through July 31, 2024. Estimated project water requirements were 83.87 acre-feet over the 12 -month period covered by the plan (August 2023 to July 2024). 6.4.7(4) REPLACEMENT WATER SOURCES ASCI utilizes a long-standing relationship with the City of Aurora to supply the project water requirements. Currently, ASCI holds a water lease with the City of Aurora to supply replacement water for the Site from 2022 through 2026. ASCI will continue to utilize this relationship throughout mining and reclamation of the mine. Chavers Mining Resource DRMS Permit No. M-2015-030 Amendment No. 2 (AM -02) March 2024 Page 18 6.4.7(5) NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES) PERMIT ASCI has acquired a National Pollutant Discharge Elimination System (NPDES) permit from the Colorado Department of Public Health and Environment (CDPHE) — Water Quality Control Division (WQCD). The Certification Number for the Chavers Mining Resource is COG501603. Chavers Mining Resource DRMS Permit No. M-2015-030 Amendment No. 2 (AM -02) March 2024 Page 19 6.4.12 EXHIBIT L - RECLAMATION COSTS 6.4.12(1) COST ESTIMATE The reclamation plan for the Chavers Mining Resource is to backfill the Site at least to the minimum requirement of one (1) foot above the historic high measured water table elevation as a worst -case reclamation scenario. The pre -mining surface topography of the Site gently sloped from the south to the north. The historic high groundwater elevation is 4,910.33 ft amsl in monitoring well MW -3 which is located near the midpoint of the Site. This indicates that a midpoint baseline backfill elevation of 4,912 ft amsl will provide sufficient coverage (i.e., 1.67 feet). In February 2024, photogrammetry was conducted to document current topography of the Site. ASCI utilized Propeller software to map site contours and perform the earthwork cut/fill volume calculations to balance the affected area to the midpoint backfill elevation of 4,912 ft amsl (actual backfill will smoothly transition from south to the north). The contour map generated by Propeller is presented in Exhibit L-1. The material volumes generated by Propeller are presented in the following table. Earthwork Volumes to Balance the Site to 4,912 ft amsl Fill Material Required (Total) 764,398 CYs Cut Material On -site 680,718 CYs Required Fill Material to be Imported from Off -site 83,680 CYs Based on the photogrammetry conducted, 83,680 CYs of material is required to be imported from off -site to balance the Site. To determine the cost to import this material, ASCI obtained three (3) quotes, each valid for 12 -months, from area operators to purchase, load, and haul (includes freight and fuel charge) the backfill material to the Site (Exhibit L-2). A conversion factor of 1.5 was used to convert tons to CYs. The average cost of the three (3) quotes was used when calculating the reclamation bond required for the Site. The average push distance for a dozer to push material dumped at the pit crest is approximately 150 feet. Exhibit L-3 presents the costs that would be incurred by the state, broken down into the various major phases of reclamation, to complete reclamation of the Site as geotechnically stable, non - erosive, properly draining, and weed -free. To ensure the reclamation bond remains sufficient, ASCI commits to re-evaluating earthwork volumes to determine the amount of backfill material required to be imported from off -site annually. In addition, if a permitted mine site operated by ASCI is not specified as the source for off -site backfill material, ASCI will obtain revised cost estimates to purchase, load, and haul the required volume of backfill material to be imported from area operators. This information will be submitted to DRMS as part of the Annual Report each Chavers Mining Resource DRMS Permit No. M-2015-030 Amendment No. 2 (AM -02) March 2024 Page 20 year beginning in 2025. If a revised liability amount exceeds the performance bond currently held, ASCI will submit additional bond within 60 days of DRMS confirming the amount required. 6.4.12(2) ADDITIONAL DATA TO SUBSTANTIATE COST ESTIMATE ASCI will provide additional, reasonable data to substantiate the estimate of the cost of reclamation for all Affected Lands, if requested. LEGEND I = Cut = Fill Quantity to Balance Affected Area to 4,912 ft amsl: Cut = 680,718 CYs Fill = 764,398 CYs Net = 83,680 CYs to be imported from off -site. Major Contour Line = 10 feet Minor Contour Line = 2 feet 710ftus ASPHALT SPECIALTIES CO. Exhibit L-1 Chavers Mining Resource Regular 112 Permit (AM -02) Permit No. M-2015-030 • ■ • :propeller Exhibit L-2: Cost Estimates to Import Backfill Material from Off -Site Chavers Mining Resource Regular 112 Permit (AM -02) DRMS Permit No. M-2015-030 NON, allrimmw MAIN OFFICE 9075 WCR 10' Fort Lupton, 80821 PHONE: (303)-857-1754 FAX (303)-857-2933 Bennett PIT 10992 CR 23' Fort Lupton, CO 80821 2024 NCC Pricing DISPATCH 303-857-173 Fax e: Submitted to: Lewicki on behalf of Asphalt Specialties Attn: Ynnie Contact N: Project: Chavers Reclamation Project No. Bid Date: 3/18/2024 kern Sand 8 Gravel Products Est STY. Unit F.O.B. Bennett Pit Tandem 25 ton Trailer F.O.B.. 1 1 1/2" WASHED ROCK AS NEEDED TON 2 3/4" WASHED ROCK AS NEEDED TON 3 "3" - 8" UNWASHED COBBLE AS NEEDED TON 4 3/8" PEA GRAVEL AS NEEDED TON 5 3/4" ROAD BASE AS NEEDED TON 6 SQUEEGEE"' AS NEEDED TON 7 C33 CONCRETE SAND AS NEEDED TON 8 PIT RUN AS NEEDED TON 9 SCREENED TOPSOIL AS NEEDED TON 10 UNSCREENED TOPSOIL AS NEEDED TON 11 FILL DIRT/OVERBURDEN 150,000 TON $3.50 $5.50 $9.00 Installation Pricing I Quoted to: Inclusions: Exclusions: workers comp. and liability insurance bond mobilization (H required) landscaping dispose of material restoration (reseeding) taxes permits, fees, traffic control, surveying restoration (reseeding) dispose of material taxes testing es: $125.001 hour= standing time Access is required to be safe and suitable for trucks entering and exiting sites. Fuel Surcharge: Base Rate is good for diesel price of $4.25/ton, diesel price from $4.25 - $5.00 will increase rate 10% When Available Quoted By: Northam Colorado Constructors Inc. Chad Linker Accepted: Company: Signature: Title: Sz•,�?s9 fr?e4 (O, Ga 5o Date: 3�pft- J� Q¢s cety lhp.e yr AGGREGATE MATERIALS QUOTE BURNCO Customer: Asphalt Specialties Co., Inc. Account Contact : Greg Geras Contact #: 720-322-7055 BURNCO COLORADO LLC 10100 Dallas St. Henderson, CO 80640 Job Name : Material Supply Address: Hwy 85 & CR 8 City -State: Ft Lupton, CO Email: Eff. Date: 3/13/2024 Freight Billed to: BURNCO Tax Exempt: Please send all tax exempts and building permits to: taxexempt.co@burnco.com Bid MG11937 Product Code Material Description Est Tons Firestone Inouye Ewing Nissen Trailer (per ton)Current Fuel Surcharge Included "Total Price AG001400 Overburden 150,000 $2.50 $3.65 $6.15 A0001400 Overburden 150,000 62.50 $3.65 $6.15 Fuel Surcharges may apply and are subject to change depending upon fuel prices. Terms & Conditippns: if quote is accepted vnthm i5 days, prices are valid through 3/19/2025. Material will be available for the next 12 months at the above price. REVOCAVON OF PRICING: Your credit account (i applicable) is conditional & may be laced on credit hold/Cash 0e Delivery (C.O.D.) terms if BURNCO Colorado, LLC deems it necessay While on C.O.D. status, your quoted prices will be null & void until your account is removed from the C.O.D. status. QUOTATION EXPIIiATjONS AND DELAY: This quotation ma be withdrawn or modified by BURNCO Colorado, LLC d not confirmed within 15 days from quotation date. Deliveryof products or performance of services herein quoted are subject to delays occasioned by circumstances beyond our control. Therefore, we do not guarantee availability of products. Prices are valid only at the specified locations, unless the specified product is not available and other arrangements have been made. Ran ion does not indude sales tax and taxes are used where applicable. QtIANTInES: nn�nl quantities are approximate and are for bidding purposes only. Final payments will be made on actual quantities picked up or delivered and by the unit price bid. Any and all discrepancies must be brought to our attention within 60 days from the date of the original invoice. **DELIVERY/FREIGHT RATES: BURNCO Colorado, LLC will quote freight rates and schedule any applicable delivery. Freight rates are based upon fuel and material prices, and may increase as necessary. Trailers rate are priced per ton. Tandem rates are priced per load. Tandems and Trailers must be unloaded within 15 minutes of arrival time or orders are subject to $100.00 per hour wait time. Fuel Surcharge: effective ay $3.00 per gallon incremental increase of $0.25 thereof 4% will be added to the freight cost. This will be adjusted monthly. Accepted By: Dispatch & Orders Signature: 970-587-6710 Date of Acceptance: 3/w/7)T MILLIKEN JEFFCO Inouye 315 FRONTIER COURT 10888 HIGHWAY 93 12210 CR 14.5 BM Schell MILLIKEN, CO 80543 GOLDEN, CO 80403 Ft. Lupton, CO 80621 Aggregate Sales Manager Pit 970-587-6694 Pit 970-587-6695 Pit 970-587-6695 Phone: 970-587-7283 Fax: 970-587-7334 Ewing Corp HQ Nissen Cell: 970-539.1418 7501 S Hwy 85 10100 Dallas St. WCR 58 & 47.5 email: Bdl.Schell@Bumeo.com Fort Lupton, CO 80621 Henderson, CO 80640 Greeley, CO 80631 General Sales Fax: 970-587-7245 Pit 970-587-6695 970-587-7200 Pit 970-587-6694 Exhibit L-3: Reclamation Costs Chavers Mining Resource Regular 112 Permit (AM -02) DRMS Permit No. M-2015-030 DIRECT COSTS Item 1 Mobilization/Demobilization Task Description 2 Dewatering Operation 3 Push Existing On -site Fill into Excavated Area 4 Import Backfill Material to Site (Quote Avg. - includes trucking and fuel surcharge) 5 Push imported fill into excataed areas 6 Topsoil Replacement 87 acres @ 1' Depth 7 Revegetate Disturbed Area 87 acres Hours Volume Area Cost Extension [hrs./ /yd 3 ] (acres) [$✓) 1$] 4.44 $1,393.92 $6,189.00 1440.00 $22.80 $32,832.00 1557.12 $882.17 $1,373,644.55 83,680 $10.65 $891,192.00 82.40 $882.14 $72,688.34 241.03 $1,002.70 $241,680.78 16.00 87 $2,324.96 $202,271.52 8 Total Direct Costs $2,820,498.19 INDIRECT COSTS OVERHEAD AND PROFIT 1 Liability Insurance (2.02%) $56,974.06 2 Performance Bond (1.05%) $29,615.23 3 Job Superintendent Costs $67,691.96 4 Profit (10%) $282,049.82 5 Total Overhead and Profit $436,331.07 6 Contract Amount (Direct Costs plus Overhead and Profit) $3,256,829.26 LEGAL - ENGINEERING - PROJECT MANAGEMENT 7 Financial Warranty Processing (Legal/Related Costs) 8 Engineering Work and/or Contract/Bid Preparation (4.61%) 9 Reclamation Management and/or Administration (5.00%) 10 Contingency @ 3.00% $500.00 $150,139.83 $162,841.46 $84,614.95 11 Total Indirect Costs $834,427.31 TOTAL BOND AMOUNT (DIRECT v INDIRECT) = $3,654,925.50 Chavers Mining Resource DRMS Permit No. M-2015-030 Amendment No. 2 (AM -02) March 2024 Page 21 6.4.13 EXHIBIT M - OTHER PERMITS AND LICENSES The following table provides an updated list of permits and approvals ASCI holds to conduct mining and reclamation operations. Permit / Approved Plan Permit No. / Approval Date DRMS Permit M-2015-030 CDPS Discharge Permit COG501603 APCD Mine Permit 16WE0619F APCD Recycling Center 17WE0810F DWR Gravel Pit Well Permit 80121-F DWR Industrial Well Permit 80120-F DWR SWSP Plan Year 2023 - 2024 (approved August 29, 2023) Fort Lupton Special Use Permit Resolution No. 2019R043 Fort Lupton Annexation Ordinance Nos. 2015-993 & 2019-1051 Fort Lupton Zoning Ordinance No. 2019-1052 Chavers Mining Resource DRMS Permit No. M-2015-030 Amendment No. 2 (AM -02) March 2024 Page 22 6.4.17 EXHIBIT Q - PROOF OF MAILING NOTICES TO BOARD OF COUNTY COMMISSIONERS AND CONSERVATION DISTRICT The following documentation is proof that notice of the permit amendment application was sent to the Board of County Commissioners and to the Board of Supervisors of the local Conservation District, pursuant to Rule 1.6.2(1)(a)(ii). NOTICE OF FILING AMENDMENT APPLICATION FOR COLORADO MINED LAND RECLAMATION PERMIT FOR A REGULAR (112) CONSTRUCTION MATERIALS EXTRACTION OPERATION NOTICE TO THE BOARD OF COUNTY COMMISSIONERS Weld COUNTY Asphalt Specialties Co., Inc. (the "Applicant/Operator") has applied for an amendment to the Regular (112) reclamation permit from the Colorado Mined Land Reclamation Board (the "Board") to conduct the extraction of construction materials operations in Weld County. The attached information is being provided to notify you of the location and nature of the proposed amendment. All changes to the existing permit are on file with the Division of Reclamation, Mining, and Safety (the "Division") and the local county clerk and recorder. The applicant/operator proposes to reclaim the affected land to rangeland use. Pursuant to Section 34-32.5-116(4)(m), C.R.S., the Board may confer with the local Board of County Commissioners before approving ofthepost-mining land use. Accordingly, the Board would appreciate your comments on the proposed operation. Please note that, in order to preserve your right to a hearing before the Board on this application, you must submit written comments on the application within twenty (20) days of the date of last publication of notice pursuant to Section 34-32.5-112(10), C.R.S. If you would like to discuss the proposed post -mining land use, or any other issue regarding this amendment application, please contact the Division of Reclamation, Mining, and Safety, 1313 Sherman Street, Room 215, Denver, Colorado 80203, (303) 866-3567. I, (Printed Name) received the above notification and the associated application on behalf of the Weld County Board of Commissioners on , 2024. , 2024 Signature RECEIVED MAR 27 2024 WELD COUNTY COMMISSIONERS NOTICE OF FILING AMENDMENT APPLICATION FOR COLORADO MINED LAND RECLAMATION PERMIT FOR A REGULAR (112) CONSTRUCTION MATERIALS EXTRACTION OPERATION NOTICE TO THE BOARD OF SUPERVISORS OF THE LOCAL CONSERVATION DISTRICT PLATTE VALLEY CONERVATION DISTRICT Asphalt Specialties Co., Inc. (the "Applicant/Operator") has applied for an amendment to the Regular (112) reclamation permit from the Colorado Mined Land Reclamation Board (the "Board") to conduct the extraction of construction materials operations in Weld County. The attached information is being provided to notify you of the location and nature of the proposed amendment. All changes to the existing permit are on file with the Division of Reclamation, Mining, and Safety (the "Division") and the local county clerk and recorder. The applicant/operator proposes to reclaim the affected land to rangeland use. Pursuant to Section 34-32.5-116(4)(m), C.R.S., the Board may confer with the local Conservation District before approving of the post -mining land use. Accordingly, the Board would appreciate your comments on the proposed operation. Please note that, in order to preserve your right to a hearing before the Board on this application, you must submit written comments on the application within twenty (20) days of the date of last publication of notice pursuant to Section 34-32.5-112(10), C.R.S. If you would like to discuss the proposed post -mining land use, or any other issue regarding this amendment application, please contact the Division of Reclamation, Mining, and Safety, 1313 Sherman Street, Room 215, Denver, Colorado 80203, (303) 866-3567. I, To (0*A t 1,5 e, (Printed Name) received the above notification and the associated application on behalf of the Board of Supervisors of the Platte Valley Conservation District on /2.--4"-- , 2024. Signature -/ 2-4- , 2024 Chavers Mining Resource DRMS Permit No. M-2015-030 Amendment No. 2 (AM -02) March 2024 Page 23 6.4.18 EXHIBIT R — PROOF OF FILING WITH COUNTY CLERK & RECORDER The following affidavit/receipt indicates the date on which the application was placed with the local County Clerk and Recorder for public review, pursuant to Rule1.6.2(1)(c). NOTICE OF FILING AMENDMENT APPLICATION FOR COLORADO MINED LAND RECLAMATION PERMIT FOR A REGULAR (112) CONSTRUCTION MATERIALS EXTRACTION OPERATION Filing for Public Inspection with the Weld County Clerk and Recorders Office The attached information is being provided for public review of the location and nature of the proposed amendment to the operation. All changes to the existing permit are on file with the Division of Reclamation, Mining, and Safety (the "Division") and the Weld County Clerk and Recorder. PUBLIC NOTICE Asphalt Specialties Co., Inc. whose address and phone number is 10100 Dallas Street, Henderson, Colorado 80640 / (303) 289-8555 has filed an amendment application to the existing Regular (112) Construction Materials Operation Reclamation Permit from the Colorado Mined Land Reclamation Board under provisions of the Colorado Land Reclamation Act for the Extraction of Construction Materials. The mine is known as the Chavers Mining Resource and is located at or near Section 18, Township 1 North, Range 66 West, 6th Prime Meridian in Weld County, Colorado. The mine commenced operation in July 2016, and the proposed date of completion is November 2044. The proposed future use of the land is rangeland. Additional information and tentative decision date may be obtained from the Division of Reclamation, Mining, and Safety, 1313 Sherman Street, Room 215, Denver, Colorado 80203, (303) 866-3567, or at the Weld County Clerk and Recorder's office at 1250 H Street, Greeley, Colorado 80631, or the above -named applicant. I, (Printed Name) received the above notification and the associated application on behalf of the Weld County Clerk and Recorder on , 2024. , 2024 Signature Chavers Mining Resource DRMS Permit No. M-2015-030 Amendment No. 2 (AM -02) March 2024 Page 24 6.4.18 EXHIBIT S - PERMANENT MAN-MADE STRUCTURES One (1) additional structure, the Denver Water Lupton Lakes Inlet and Outlet Facility, has been constructed within 200 feet of the affected land requiring a structure agreement. No change to previous structure agreements are required. The following is a copy of the Structure Agreement between ASCI and Denver Water. Structure Agreement This letter has been provided to you as the owner of a structure on or within two hundred (200) feet of a mine site. The State of Colorado, Division of Reclamation, Mining and Safety ("Division") requires that where a mining operation will adversely affect the stability of any significant, valuable and permanent man-made structure located within two hundred (200) feet of the affected land, the Applicant shall either: a) Provide a notarized agreement between the Applicant and the Person(s) having an interest in the structure, that the Applicant is to provide compensation for any damage to the structure; or b) Where such an agreement cannot be reached, the Applicant shall provide an appropriate engineering evaluation that demonstrates that such structure shall not be damaged by activities occurring at the mining operation; or c) Where such structure is a utility, the Applicant may supply a notarized letter, on utility letterhead, from the owner(s) of the utility that the mining and reclamation activities, as proposed, will have "no negative effect" on their utility. (Construction Materials Rule 6.3.12 and Rule 6.4.19 & Hard Rock/Metal Mining Rule 6.3.12 and Rule 6.4.20) The Colorado Mined Land Reclamation Board ("Board') has determined that this form, if properly executed, represents an agreement that complies with Construction Materials Rule 6.3.12(a), Rule 6.4.19(a), and C.R.S. § 34-32.5-115(4)(e) and with Hard Rock/Metal Mining Rule 6.3.12(a), Rule 6.4.20(a), and C.R.S. § 34-32-115(4)(d). This form is for the sole purpose of ensuring compliance with the Rules and Regulations and shall not make the Board or Division a necessary party to any private civil lawsuit to en force the terms of the agreement or create any enforcement obligations in the Board or the Division. The following structures are located on or within 200 feet of the proposed affected area: 1. Denver Water — Lupton Lakes Inlet and Outlet Facility 2. 3. 4. 5. (Please list additional structures on a separate page) CERTIFICATION The Applicant, Asphalt Specialties. Co., Inc.. by Daniel W. Hunt, as President. does hereby certify that Denver Water shall be compensated for any damage from the proposed mining operation to the above listed structure(s) located on or within 200 feet of the proposed affected area described within Exhibit A, of the Reclamation Permit Application for Chavers Mining Resource, File Number M-2015-030. This form has been approved by the Colorado Mined Land Reclamation Board pursuant to its authority under the Colorado Land Reclamation Act for the Extraction of Construction Materials and the Colorado Mined Land Reclamation Act for Hard Rock, Metal, and Designated Mining Operations. Any alteration or modification to this form shall result in voiding this form. NOTARY FOR PERMIT APPLICANT ACKNOWLEGED BY: Applicant Y\ Representative Name p6, n i I W. N c c► Date A/odew.be►s- )7, Ac, STATE OF Coto Ka r.v ) ss. COUNTY OF A of cersi 5 ) Title Pesrr1enr' The foregoing was acknowledged before me this l 7°'day of ,A/o v e m lae yr, 20 , by e_ J VV. P.-4- as , g-t,S cx y7'j of f{sehri C . Notary Public JAN NELSON NOTARY PUBLIC STATE OF COLORADO NOTARY ID 10994030527 My Commission Expires April 29.2024 My Commission Expires: ,4,jzt..'. - NOTARY FOR STRUCTURE OWNER ACKNOWLEGED : Structure Own r 4 ci 4F ` --- Date ei — NU '` _ .,,:).---- STATE OF C.o) ss. COUNTY OF .12), :Y, ) Name �v^y {-tElbEMk Title O 1ALc fZt - op C-N6,N g i/A -PROP xThe foregoing was acknowledged before me this day of fu VR M.L.S1,P , 20 22, by �1,., b;✓� ��-�r Cif � ,s2 as n�, 2 �,�- f : opof l ��r.v �' WO- • —P" My Commission Expires: c).- L -'I i Public GINA BECKY NOTARY PUBLIC STATE OF COLORADO NOTARY ID 20144002 MY COMMISSION EYPRRES FEBRUARY 24, 2028 ATTACHMENT 1 AFFIDAVIT FOR CLEAN MATERIAL BACKFILL AFFIDAVIT I, Daniel W. Hunt of Asphalt Specialties Co., Inc. (ASCI) hereby certify that only clean and inert material will be imported at Chavers Mining Resource (DRMS Permit No. M- 2015-030). All material will adhere to the Division's definition of Inert Material as defined in Rule 1.1(22). Daniel W. Hunt, President Asphalt Specialties Co., Inc. State of Colorado ) )ss County of ) The foregoing instrument was acknowledged before me this ) Sly of /Yc , 202L-, by T )r n , e j F),,,-) as PKe Notar Public My Commission expires: /t . ,^�.r1 JAN NELSON NOTARY PUBLIC STATE OF COLORADO NOTARY ID 19994030527 MY Commission Expires April 29, 2024 ATTACHMENT 2 GROUNDWATER MONITORING AND MITIGATION PLAN GROUNDWATER MONITORING AND MITIGATION PLAN FOR CHAVERS MINING RESOURCE DRMS PERMIT NO. M-2015-030 12367 COUNTY ROAD 8 FORT LUPTON, WELD COUNTY, COLORADO Prepared by: ASPHALT SPECIALTIES CO., INC 10100 DALLAS STREET HENDERSON. COLORADO 80640 303-289-8555 • Fax 303-289-7707 ASPHALT NINIME=Ilk SPECIALTIES CO. March 2024 Chavers Mining Resource Groundwater Monitoring and Mitigation Plan March 2024 Page ii TABLE OF CONTENTS Section Page 1.0 BACKGROUND INFORMATION 1 1.1 SITE DESCRIPTION I 2.0 BASELINE GROUNDWATER CHARACTERIZATION 1 2.1 MONITORING WELL NETWORK 2 2.1.1 Groundwater Point of Compliance Wells 2 2.2 BASELINE GROUNDWATER QUANTITY 2 2.2.1 Predicted Impacts to Hydrologic Balance 2 2.3 BASELINE GROUNDWATER QUALITY 3 2.3.1 Groundwater Quality Standards 3 2.3.2 Baseline Groundwater Quality Sampling Results 3 3.0 GROUNDWATER MONITORING AND MITIGATION PLAN 4 3.1 GROUNDWATER QUANTITY 4 3.1.1 Groundwater Measurement Schedule 4 3.1.2 Groundwater Quantity Data Evaluation and Trigger Levels 4 3.1.3 Evaluating Impacts to the Hydrologic Balance and Mitigation Measures 4 3.1.4 Reporting 5 3.2 GROUNDWATER QUALITY 5 3.2.1 Groundwater Sampling Schedule 5 3.2.2 Groundwater Sample Collection Procedures 5 3.2.3 Laboratory Analysis of Groundwater Samples 6 3.2.4 Groundwater Quality Data Evaluation and Trigger Levels 6 3.2.5 Evaluating Impacts to Groundwater Quality and Mitigation Measures 6 3.2.6 Reporting 7 LIST OF FIGURES FIGURE I FIGURE 2 FIGURE 3 SITE LOCATION MAP GROUNDWATER MONITORING WELL LOCATION MAP BASELINE GROUNDWATER WELL ELEVATIONS LIST OF TABLES TABLE 1 TABLE 2 TABLE 3 MONITORING WELL CONSTRUCTION INFORMATION AND BASELINE GROUNDWATER ELEVATIONS GROUNDWATER QUALITY STANDARDS BASELINE GROUNDWATER QUALITY RESULTS- FIRST FIVE (5) QUARTERS OF DATA Chavers Mining Resource Groundwater Monitoring and Mitigation Plan March 2024 Page iii LIST OF TABLES (CONTINUED) TABLE 4 BASELINE GROUNDWATER QUALITY RESULTS - LAST THREE (3) QUARTERS OF DATA LIST OF APPENDICES APPENDIX A MONITORING WELL CONSTRUCTION LOGS LIST OF ACRONYMS ASCI Asphalt Specialties Co.. Inc. CDSS Colorado's Decision Support System DRMS Division of Reclamation. Mining. and Safety DWR Division of Water Resources ft amsl feet above mean sea level ft bgs feet below ground surface gpd/ft gallons per day per foot HSA hollow stem auger POC Point of Compliance INS Interim Narrative Standards QA/QC quality assurance/quality control TDS total dissolved solids WQCC Water Quality Control Commission (havers Mining Resource Groundwater Monitoring and Mitigation Plan March 2024 Page l 1.0 BACKGROUND INFORMATION Asphalt Specialties Co., Inc. (ASCII) has prepared this Groundwater Monitoring and Mitigation Plan for the Chavers Mining Resource (Site) located at 12367 County Road 8. Fort Lupton. Weld County, Colorado (Figure 1). This plan details the results of the baseline groundwater characterization conducted and future monitoring activities to protect the existing and reasonably potential future uses of groundwater. This plan has been developed in accordance with the requirements set forth in the Construction Materials Rule No. 3. Section 3.1.7. and based on correspondence with Division of Reclamation. Mining. and Safety (DRMS) to ensure the appropriate data required for protection of groundwater quality and quantity is obtained. 1.1 SITE DESCRIPTION Mining activities at the Site occur within the unconfined alluvial aquifer of the South Platte River. The average thickness of the overburden is approximately 3.5 to 4 feet below ground surface (ft bgs). Beneath the overburden. are low terrace alluvial deposits of the South Platte River. The deposits vary from sandy lean clay in the upper zones, to coarse clayey sand and sand with gravel nearer the bedrock. The sand and gravel deposits vary in thickness but averages approximately 28 feet across the Site. Beneath the sand and gravel deposit is the underlying Denver Formation which is a consolidated bedrock stratum composed primarily of generally impermeable shale and claystone approximately 550 — 600 feet thick. Surrounding land uses in the area include multiple other sand and gravel mines. oil and gas industry sites, and rangeland/agricultural lands. Sand and gravel mining operations have been conducted at the Site since 2016 and the affected area is approx. 87 acres. Groundwater in the alluvial aquifer at the Site flows to the north-northwest towards the South Platte River. Per the Division of Water Resources (DWR) Colorado's Decision Support System (CDSS) website. the alluvial aquifer has rapid permeability with a transmissivity of approximately 85.000 gallons per day per toot (gpd/ft) and specific yield of 0.2. The estimated coefficient of storage is I.5x IV to 3.1 x 10` . The Site is located within the City of Fort Lupton Wellfield as classified by the Water Quality Control Commission (WQCC) Regulation 42. 2.0 BASELINE GROUNDWATER CHARACTERIZATION To characterize baseline groundwater conditions. ASC'I collected data for eight (8) consecutive quarters beginning in the I' Quarter of 2022. Data collected included monthly groundwater elevations (for groundwater quantity) and quarterly groundwater sampling events (for groundwater quality). For the first five (5) quarters. data was collected from the two (2) up -gradient monitoring wells (MW -2 and MW -3) as they were the only monitoring wells installed at the Site during this portion of the baseline data collection period. For the last three (3) quarters. data was collected from all five (5) monitoring wells (M W-2 through M W-6). The total data sets used to characterize baseline groundwater conditions included 26 months of groundwater elevations and eight (8) consecutive quarters of groundwater sample laboratory results during the data collection period (i.e.. 1st Quarter 2022 through 4th Quarter 2023). Chavers Mining Resource Groundwater Monitoring and Mitigation Plan March 2024 Page 2 2.1 MONITORING WELL NETWORK To monitor groundwater quantity and quality at the Site. ASCI utilizes a network of (5) groundwater wells that have been completed within the unconsolidated alluvial at the Site (i.e.. MW -2 through MW -6). Borings were installed utilizing 4-1/4" ID hollow stem auger (HSA) drilling method from ground surface to the top of underlying bedrock. Monitoring wells were completed at a depth slightly above the top of bedrock encountered. Monitoring wells are constructed of two (2) -inch diameter Schedule 40 PVC with factory slotted 0.010" slot size for the screened portions. The filter packs consist of 10/20 silica sand and extend approximately two (2) - feet above the top of the well screen. A bentonite seal (chips) was installed from the top of the filter pack to ground surface. At the surface. concrete pads were installed along with a four (4) - inch square steel well cover with hinged locking cap to protect the above ground riser. Monitoring well construction details are presented in Table 1. Copies of the monitoring well construction logs are provided in Appendix A. 2.1.1 Groundwater Point of Compliance Wells Two (2) of the monitoring wells (MW -2 and MW -3) are located hydraulically up -gradient along the eastern boundary of the Site. Up -gradient monitoring wells M W-2 and M W-3 were installed in November 2016. Three (3) monitoring wells (MW -4, MW -5. and MW -6) are located hydraulically down -gradient along the western and northern permit boundaries of the Site. Down - gradient monitoring wells MW -4 through MW -6 were installed in June 2023. Down -gradient wells (MW -4 through MW -6) will serve as the designated 'Points of Compliance'' (POC) wells in accordance with Rule 3.1.7(6)(b)(ii)(A). The locations of the monitoring wells are shown on Figure 2. 2.2 BASELINE GROUNDWATER QUANTITY All groundwater elevations collected from the monitoring wells at the Site (including abandoned monitoring well M W-1) are presented in Table 1. The maximum change in groundwater elevation for any well during the baseline collection period between January 2022 through February 2024 occurred in MW -3 at 5.76 feet and the minimum change occurred in MW -5 at 4.50 feet. The average change in groundwater elevation from all wells across the Site during the baseline collection period was 5.13 feet. A graph depicting the fluctuation in groundwater elevation for each well during the baseline monitoring period is presented in Figure 3. The groundwater high and low elevations identified for each well during the baseline collection period will be used as the basis for comparison for future groundwater measurements collected to demonstrate protections of groundwater quantity throughout the operational life of the mine until reclamation has been achieved (i.e.. when release of reclamation liability occurs). 2.2.1 Predicted Impacts to Hydrologic Balance Groundwater elevations at the Site prior to the start of mining are not available. To facilitate dry mining at the Site. groundwater has been pumped since 2016. Due to the influence of pumping the pit. the hydrologic balance within the alluvial aquifer at the Site is affected. However. as a result of the area -wide industrial development east of the South Platte River in the vicinity of the Chavers Mining Resource Groundwater Monitoring and Mitigation Plan March 2024 Page 3 Site. there are multiple other factors present which impact the hydrologic balance in the area (e.g.. other sand and gravel mines. slurry walls. and/or lined water storage). No wells are located within 600 feet of the dewatering pump location at the Site east of the South Platte River. Due to a lack of groundwater elevations prior to the industrial development of the area and the start of pumping at the Site, the extent of impacts to the hydrologic balance at and beyond the Site boundaries cannot be determined. ASCI will continue to monitor groundwater levels at the Site boundaries to identify any potential adverse off -site impact to the hydrologic balance when compared against data collected during the baseline characterization period. 2.3 BASELINE GROUNDWATER QUALITY 2.3.1 Groundwater Quality Standards The objective of the baseline groundwater sampling was to document the baseline groundwater quality for applicable analytes and establish the groundwater quality standards for the Site. Per WQCC Regulation No. 42 "Site -specific Water Quality Classifications and Standards for Groundwater". the Site is located within the specified area of the City of Fort Lupton Wellfield. The groundwater classifications in this area are Domestic Use -Quality and Agricultural Use - Quality. The groundwater quality standards assigned to confined and unconfined groundwater in the City of Fort Lupton Wellfield are WQCC Regulation 41 Interim Narrative Standards (INS) Tables 1 — 4 (5 CCR 1002-41). These are the same standards presented in the DRMS guidance document "Groundwater Monitoring: Sampling and Analysis Plan Guidance, Construction Materials and Hard Rock Sites" (DBMS. September 2023). Per Rule 3.1.7(2)(c)(ii) and through correspondence with DRMS. the lowest WQCC Regulation 41 INS Tables 1 — 4 standard for applicable analytes is utilized as the default numeric protection value benchmark (i.e.. groundwater quality standard). except for analytes where the baseline groundwater concentration exceed these values. For these analytes, the highest concentration reported during the baseline groundwater sampling period is be used as a site -specific groundwater quality standard. A complete list of the groundwater quality standards for the Site is presented in Table 2. These standards will be used for comparison against future groundwater sampling event results to demonstrate protection of existing and reasonably potential future uses of groundwater throughout the operational life of the mine until reclamation has been achieved (i.e.. when release of reclamation liability occurs). Any change to the analytes on the list (e.g.. reduction of analytes) or groundwater quality standard values will be submitted to DRMS via Technical Revision for approval prior to implementing. 2.3.2 Baseline Groundwater Quality Sampling Results Results of the eight (8) quarters of baseline groundwater sampling events used to determine the groundwater quality standards for the Site are presented in Tables 3 and 4. Results are compared against the lowest WQCC Regulation 41 INS Tables 1 — 4 standards for applicable analytes. As shown in Tables 3 and 4. results for two (2) analytes during the baseline monitoring period (Manganese and Sulfate) exceeded the lowest WQCC Regulation 41 INS Tables I — 4 standards. Therefore, the highest concentration reported for Manganese and Sulfate during the eight (8) Chavers Mining Resource Groundwater Monitoring and Mitigation Plan March 2024 Page 4 quarters of baseline groundwater sampling will be used as the site -specific groundwater quality standard. Results for all other analytes were below their respective WQCC Regulation 41 INS Tables I — 4 standards. 3.0 GROUNDWATER MONITORING AND MITIGATION PLAN The following activities will be conducted by ASCI to monitor groundwater quantity and quality throudiout the operational life of the mine until reclamation is complete. 3.1 GROUNDWATER QUANTITY 3.1.1 Groundwater Measurement Schedule ASCI will collect monthly groundwater elevation readings from monitoring wells MW -2 through MW -6. ASCI will compare monthly groundwater levels against the baseline groundwater level data for each well within one (1) week of collection to determine if any impact to the hydrologic balance have occurred. Groundwater measurements will continue for a minimum of 12 additional months (i.e.. March 2024 to February 2025). Any change to the groundwater level monitoring schedule (i.e.. reduction in measurement frequency) will be submitted to DRMS via Technical Revision for approval prior to implementing. 3.1.2 Groundwater Quantity Data Evaluation and Trigger Levels Groundwater elevations naturally fluctuate throughout the year based on the season but can also be influenced by a variety of unusual conditions at any one time (e.g.. persistent rain or drought). The primary trigger for evaluating if potentially adverse impacts to the hydrologic balance have occurred will be if the groundwater level in any well either increases two (2) feet above the baseline high measurement or decreases two (2) feet below the baseline love measurement. The trigger measurements for each well are provided in the following table. Well ID Baseline GW Elevation — High (ft amsl) Trigger Elevation for Evaluating High GW Impacts (ft amsl) Baseline GW Elevation — Low (ft amsl) Trigger Elevation for Evaluating Low GW Impacts (ft amsl) MW -2 4909.62 4911.62 4904.48 4902.48 M W-3 4904.64 4906.64 4898.88 4896.88 MW -4 4907.23 4909.23 4902.29 4900.29 MW -5 4912.89 4914.89 4908.39 4906.39 M W-6 4909.11 4911.11 4903.80 4901.80 Notes: ft amsl = feet above mean sea level 3.1.3 Evaluating Impacts to the Hydrologic Balance and Mitigation Measures Should groundwater elevations increase two (2) feet above the baseline high measurement or decrease two (2) feet below the baseline low measurement in any monitoring well. ASCI will Chavers Mining Resource Groundwater Monitoring and Mitigation Plan March 2024 Page 5 contact DRMS within five (5) days of discovery to discuss the path forward. Potential mitigation measures may include: ■ Increase groundwater measurement frequency to determine if impacts are anomalous and/or temporary. ■ Determine if impacts to the hydrologic balance can be sourced to changes in the mining operation implemented at the Site. ■ Evaluate the existing data set to determine if any trends are present in up -gradient and down -gradient wells. ASCI will work with DRMS to assess whether impacts may potentially be adverse and/or if additional mitigation measures are appropriate based upon the situation encountered at that time. 3.1.4 Reporting Unless impacts to the hydrologic balance are identified as described in Sections 3.1.2 and 3.1.3. ASCI will continue to report groundwater level data to DRMS as supplemental information with the annual report for the Site each year as is the current practice. 3.2 GROUNDWATER QUALITY 3.2.1 Groundwater Sampling Schedule ASCI will conduct quarterly groundwater sampling at the Site for a minimum of four (4) consecutive quarters (i.e., l0 Quarter 2024 to 4111 Quarter 2024). For each sampling event. groundwater samples will be collected from each of the five (5) monitoring wells (MW -2 through MW -6) and submitted for laboratory analysis. In addition. a duplicate quality assurance/quality control (QA/QC) groundwater sample will be collected from one of the monitoring wells per event (six [6] total samples per event). Additional QA/QC samples (e.g.. method blanks, laboratory control samples, matrix spikes, etc.) will be analyzed by the laboratory during batch analyses with results provided in the final laboratory reports. Any change to the groundwater quality monitoring schedule (i.e., reduction in sampling frequency) will be submitted to DRMS via Technical Revision for approval prior to implementing. 3.2.2 Groundwater Sample Collection Procedures Prior to sampling each well, depth to groundwater and total well depth measurements will be collected using a water level indicator to the nearest 0.01 foot. Groundwater will then be purged from the well utilizing a submersible pump with dedicated tubing or hand -bailed with a dedicated bailer. All non -dedicated equipment used to collect groundwater measurements and samples will he decontaminated with a detergent (e.g.. Alconox®O Detergent Powder) and distilled water solution prior to use at each monitoring well. A new pair of clean. disposable nitrile gloves will be utilized for sample collection at each well. Purged water will be collected in five (5) gallon buckets where water quality parameter readings for temperature, pH. specific conductivity, and total dissolved solids (TDS) will be collected. The total purge volume from the well will be recorded. Once groundwater stabilization is achieved (i.e., three consecutive readings within ten percent of Chavers Mining Resource Groundwater Monitoring and Mitigation Plan March 2024 Page 6 each other for all stabilization parameters) and/or a minimum of three (3) well volumes are removed, groundwater will be collected directly into laboratory -supplied containers with the preservative appropriate for the analysis requested. as applicable. The samples will be labeled, placed in a cooler with ice (cooled to 4°C). and stored until delivery to the laboratory accompanied by chain -of -custody documentation. 3.2.3 Laboratory Analysis of Groundwater Samples Groundwater samples submitted to the laboratory will be analyzed for thirty (30) applicable WQCC Regulation 41 INS Tables 1 —4 analytes. The following analytical methods (or comparable methods) will be utilized by the laboratory to report water quality results. Nineteen (19) Metals (Dissolved) by EPA Method 200.8 Two (2) Metals (Dissolved) by EPA Method 200.7 Six (6) Inorganic Anions by EPA Method 300.0 + Calculation Chromium by Standard Method (SM) 3500-Cr B + Calculation pH by SM 4500 -H -B TDS by SM 2540-C 3.2.4 Groundwater Quality Data Evaluation and Trigger Levels ASCI will compare laboratory results against the groundwater quality standards developed for the Site (Table 2) within one (1) week of receipt to determine if any exceedance(s) of the groundwater quality standards has occurred. The primary trigger for evaluating if potentially adverse impacts to groundwater have occurred will be if results for any analytes exceed their site -specific groundwater quality standard. 3.2.5 Evaluating Impacts to Groundwater Quality and Mitigation Measures If analyte exceedance(s) of site -specific groundwater quality standards are reported in up -gradient monitoring wells (MW -2 through MW -3). this would indicate the impact to groundwater quality is potentially from an off -site source. Should analyte exceedance(s) occur in up -gradient wells only. ASCI will monitor results from subsequent groundwater monitoring sampling events to determine if elevated concentration(s) of the analyte(s) persist and/or if migration to down -gradient POC wells (MW -4 through MW -6) occurs. If exceedance(s) of site -specific groundwater quality standards occur in POC wells (MW -4 through MW -6). ASCI will contact DRMS within five (5) days of discovery to discuss the path forward. Potential mitigation measures may include: • Conduct confirmation sampling of well(s) to verify results. • Evaluate the existing data set to determine if any trends are present in up -gradient and down -gradient wells. • Increase groundwater sampling event frequency to determine if impacts are anomalous and/or temporary (e.g., sample quarterly until two [2] consecutive quarters of monitoring ('havers Mining Resource Groundwater Monitoring and Mitigation Plan March 2024 Page 7 data indicates that results for the previously exceeding analyte(s) are at or below site - specific groundwater quality standards in POC wells). Conduct a statistical trend analysis to determine: l ) if exceedances are statistically significant increases over background; and/or 2) ifa new site -specific groundwater quality standard is appropriate (to be submitted to DRMS as a Technical Revision). ASCI will work with DRMS address impacts identified in POC wells and/or if additional mitigation measures are appropriate based upon the situation encountered at that time. 3.2.6 Reporting Unless exceedance(s) above site -specific groundwater quality standards in POC wells are identified as described in Sections 3.2.4 and 3.2.5. ASCI will report groundwater quality monitoring results to DRMS as supplemental information with the annual report for the Site each year. FIGURES 945 4947 C' 4923WELD COUNTY ROAD 8 CHAVERS MINING RESOURCE Asphalt Specialties Co., Inc. 10100 Dallas St. Henderson, CO 80640 Phone: 303-289-8555 Well f Lone Pine I I Gravel ,.� Pit r. • Mobile o Perk Weil • Water 494 Tank CHAVERS MINING RESOURCE SITE LOCATION MAP GWMMP PLAN •8M, • 4932 FIGURE 1 FORT LUPTON QUAD E 1/2 OF THE SW 1/4 S18, TIN, R68W sa C —4 DENVER VIIATFta LIM0N LAKES ItM E' 0•51LET t&OUTIES 971 ACCESS N. 4 i L �t • 1 ' r�C \O 1 \ I1 i 1 , •—Poryricri ettmoARy •r It .^ !TD ARIA ?boa • aas — 1 • sea I la • • l Cell 1 �I III` III* IIIII, It 90110e, Cell 5 -4 Acres • _...- *wow ..apm—...-.--_-,. r -4 Acres JQ N A% • I� .4 1 so / i 044444 I I iow or -. -- ! Ilts sso `,111 CO Alt — ... s rm., ra sue —.r — / Tr 1 Cell 4 -23 acres MW -4 • . ••. • • Cell 6 -4 Acres arti et_ Etip ..■yam.... _-- -L tsaas.asasMW-2 aaubrrsaiststaschimanisadmissaisaseasat linallreasatadisadkosies _ ESTATE.' f11GNNA)' 85 - —ylr - - REVISIONS Asphalt Specialties Co., Inc. 10100 Dallas Street Henderson, CO 80640 Phone: 303-289-8555 Fax: 303-289-7707 4 St Cell 3 -32 acres MW -3 St gra 4 MW -5 •irIAI gab yaw rat, •AAA IA••••A gib gra PMOPER tY BOUNDARY J NW 7`_a--- — AAAA•A4jAMMAI 4.4 — ` j aft .. Aniaat.° sew fl A ' • ♦ ar i • ` % MW -6 It I MM. tab MID tear. Cell 2 -8 acres au r t II CHAVERS MINING RESOURCE GROUNDWATER MONITORING AND MITIGATION PLAN FORT LUPTON. CO ASPHALT SPECIALTIES CO., INC. I' l !I �1 . 1 so IC, co it • tit t1 IMP LICIN0 tpct rY IAWN(N? EIPSINC --.r -- (tSINO MAIAOAIMO IIIMOAES O MONO 0 Cot ,I CAS VOA 04tAO ♦ (MIMIC Wilily' PUS — —'— — -- t7I%M AC am't..'t1 fELfPw UNt ------- ttStP$G MAIM US t•4 fir 5144 WOW s 'ma • _ - tpsttt0 tea Cr Co AVE). 0050 — tIntNG WVER - •- .- • a- (Jl75MIKG taaSACE DIM* �.--.—faflMG MROP(wt'r AQJICAIY — -- -- tDStvrf. ADIOIOIO *Ant O0601ta Y - ranee 'Wall ta. - -- - - - ( JIVING Riau Ot WAY Oar !Var. 41.:174. :: t! S t, 9-34�-- EIDSflNG pis Am snug Dr<d/rt * Stkucitott COt1 O •---aPERM? Op(PSAITN — • ' — • . 1. CCat NT MMs3 Ittfl a *cnctin *nn ROl1MDARv •A447to talc no. Or SSC -- I AMGT IrOADs Oa EXTENT OF MINING AREA n -75 ACRES AFFECTED AREA = -R7 ACRES PERMIT BOUNDARY a -OS ACRES O = Up -gradient Monitoring • = Down -gradient Monitoring Point of Compliance (POC) Well • = Abandoned 7 = Inferred Groundwater Flow Direction Well Well Well 0 150 • 1�- 300 375 450 SCALE 1' • 1I.^ FIGURE 2 - MONITORING WELL LOCATION MAP 11/14/2023 1.0 1OF1 Figure 3 - Chavers Mining Resource Baseline Groundwater Well Elevations January 2022 - February 2024 --�- MW -2 -f- MW -3 -e---MW-4 MW -5 MW -6 F ca z 0 p w J w cc I- Q 5 0 z 0 Ce 4916 4915 4914 4913 4912 4911 4910 4909 4908 4907 4906 4905 4904 4903 4902 4901 4900 4899 4898 4897 4896 N N N N I C -O LL N N N N N N N N I a Q N N Q i N N CO CO N N N N G om Q) (0 Q) z O -) w TIME co N I CO CO CO N N N C Q 2-) CO C�J CO CO CO I 46 N N N cn O z r NI N I a R3 v o w Chavers Mining Resource Monitoring Well Construction Information and Groundwater Well Elevations February 2017 - February 2024 Welitusstwctsoninformation PAS t MW -2 PAW-) Mw -4 MW.5 MW -6 IOC (ft amsl) 4925.22 4926.61 4919 63 $91 ' 11 4919.96 4919 0.1 ',round (h ems') 4921.47 4927-77 4915.88 492021 4916.93 4916.25 '-atkk•uD (ft age) 3.75 3.85 3,75 2.97 3.03 2 78 Intal Depth from TOC 36 75 37 SR 36.17 32.35 32 9 32 10 rntal Depth (ft best 33 t?n 33 r' 32-42 29.43 29 15 2? 32 Month IL Year MW -1 MW-? MW -3 MW -4 MW -5 MW•6 %Wt. Tel (II) SWL (11 6151 GW Elev. (ft small SWL TOC (ft) SWL fl tags) GW f lev (h amyl) SWL TOC 111) SWL (ft bgt) GW E.tev (ft amsl) SWL TOC (Ill SWL (ft tie's) GW 11ev. (It amsl SWL TOC (ft) SWL (ft bell GW flew (ft lentilIll SWl TO( SWL (ft bus) GW [Iry Ifs arm() *stork Groundwater Elevation% February 2017 16 It I 10.65 4910.8? 1 r.7i 15,85 4906.91 T 17 40 13 65 4902.23 Well Not Installed Well Not tnctaled Well Not Inctalled May 2037 14 10 10 35 4911 17 1780 13.95 4908 82 Well Not Installed Well Not Installed Weil Not Inst., fed November 2017 14 90 11.15 4910 3? A 18 40 1435 4908.22 9.70 5,95 4909 93 Well Not Installed Well Not Installed Well Not Installed March 2018 15.6/ 11.92 4909.55 18)3 14 38 4908.39 18 18 14.43 4901.45 Well Not Installed Well Not Installed Well Not Installed April 2018 15.99 12.24 4909.23 18.67 14.82 4907.95 18 93 15 1R 49(10.70 Well Not Installed Well Not Installed Well Not Installed May 2018 15.71 11 % 4909.51 18.82 14.97 4907.80 18 61 14.86 4901.0? Well Not Installed Well Not Installed Well Not Installed hate 2018 15.47 11 72 4909,75 19.01 15.16 4907 61 19.63 15.88 4900.00 Well Not Installed Well Not Installed Well Not Installed July 2018 15.37 11.62 4909.85 18 8; 15.07 4907 75 19.17 15.37 4400.51 Well Not Installed Welt Not Installed Well Not Installed September 2018 16 4I 12.66 4908.81 20.44 16.59 4906.18 23.87 20 12 4895.76 Well Not Installed Well Mn? Installed Weil Not Installed Odoter 2018 15.66 1191 4909.56 10,09 16 24 4906.53 27.47 23 77 4892.16 Well Not Installed Well Not Installed Well Not installed Nammber 2018 15.17 11 42 4910.05 19.93 16.08 4906.69 28.55 24,80 4891.08 Well Not Installed Well Not Installed Well Not Installed February 2019 14.33 10.58 4910.89 18.16 15.01 4907.76 T1.77 74.02 4891.86 Well Not Installed Weil Not Installed Well Not Installed Myth 2019 14.54 10 79 4910.68 19 77 15 9? 4906.85 76.20 22 45 4993.43 Well Not Installed Well Not Installed Well Not Installed Atlrst 2019 14,19 10 44 4911.03 18.63 14.78 4907.99 23.75 20.00 489% 88 Well Not Installed Well Not Installed Well Not Installed luny. 2019 14.19 10.44 4911.03 18.64 14.19 4907 98 23,83 20 08 4895 80 Well Not Installed Well Not Installed Well Not Installed July 2019 12.85 9.10 4912.37 17.:6 14.11 49011,66 22.15 18.40 41197 48 Well Not Installed Well Not Installed Well Not installed August 2019 13.17 9.42 4912.05 179 14.11 4908.66 71 44 17.69 4898.19 Well Not Installed Well Not Installed Well Not Installed September 2019 13,22 9.47 4912.00 18 55 14.70 4908.07 23.30 19.55 4896.33 Well Not Installed Well Not Installed Well Not Installed October 2019 14.45 10.70 4910.77 19 18 15.33 4907.44 26 33 7738 4893.30 Well Not Installed Well Not Installed Well Not Installed November 2019 13.79 10.04 4911 43 18.57 14.72 4908.05 20.87 17.12 4898.76 Well Not Installed WeN Not Installed Well Not Installed December 20I9 13.64 9 89 4411.58 18.13 14 28 4908_49 18.53 14.76 4901.10 Well Not Installed Well Not Installed Well Not Installed January 2020 13 51 9.82 4911 65 18.20 14 3S 4908.42 38.46 14./1 4901.17 Well Not Installed well Not Installed Well Not Installed February 2020 13.63 9.88 4911.59 18.20 14 35 490842 18.58 14.83 4901.05 • Well Not Installed Well Not Installed Well Not Installed March 2020 13.52 9 77 4911 70 17 99 14 14 4908 63 16 13 14 38 4901.50 Well Not Installed Well Not Installed We/I Not Installed May 2020 13.56 9 81 4911.66 17 93 14.08 4908 69 18.62 14.87 4911 Ol Well Not Installed Well Not Installed Well Not Installed lune 202t1 13.01 9 76 4912.21 17 70 11 8S 4908.92 18.69 14,94 4900-94 Well Not Installed Well Not Installed Well Nog Installed August 2010 13.56 9.81 4911 66 17.31 13 4(. 4909 31 17.48 13.73 4902.15 Well Not Installed Well Not Installed Well Not Installed October 7020 14 23 10.49 4910.99 18.11 14.76 4908.51 18.55 14.80 4901.08 Well Not Installed Well Not Installed Weil Not Installed December 2020 . 1 92 10 1/ 4911.30 18.11 14 26 4908 51 18 26 14 ',1 4901.37 Well Not Installed Well Not Installed Well Not Installed January 2021 14.00 10 25 4911.22 18.55 14.70 4908.07 19.25 15 50 4900.38 Well Not Installed Well Not Installed Well Not Installed February 2021 13.90 10 15 4911.32 18.07 14.22 4908.55 18.18 14.43 4901.45 Well Not Installed Well Not Installed Well Not Installed March2021 13.80 10 05 4911.42 18 38 14.53 •1908.24 16.03 12-28 4903.60 Well Not Installer! Well Not Installed Well Not Installed May 202I 13.33 9.58 4911.89 18-16 14.31 4908 46 16.67 12 92 4902.96 Well Not Installed Well Not Installed Well Not installed June 2021 13-19 9.44 4917.03 17.79 13,94 4908 83 17.04 13.29 4902.59 Well Not Installed Well Not tnctalted Well Not Installed August 7071 1S 78 12.03 4909,44 19.01 15.16 4907 61 17 49 13.74 4902.14 Well Not Installed Well Not Installed Well Not Installed October 2021 15 81 12.06 4909 41 18.9?. 15-10 4907 61 18.13 14.38 4901.50 Well Not Installed Well Not Installed Well Not Installed December 2021 16 03 _ 12.28 4909 19 18.89 15,04 4907 73 18 81 15.11E 4900,82 Well Not Installed Well Not lnctal'ed We%I Not Installed Baseline Collection Period- January 10?? through February 1074 tanuary 2022 February 2022 11..34 16 95 I ll 59 13.20 I 4908 8814 4908.27 72 19.64 15 87 15 '19 4906.90 4906.98 18 83 18.71 1508 14.96 4900.80 4900.97 Well Not tnstallp i Well Npt IrNlWtled Well Not Inv;.Ihed WeII Not Installed Well Not Installed Well Not Installed March 2022 Well Abandoned 18.98 15.13 4907.64 18-75 15:00 4900.88 Well Not Installed Well Not Installed Well Not Installed April 2022 Well Abandoned 18.84 14.99 4907.78 18.37 14.62 4901.26 Well Not Installed Well Not Installed Well Not Installed May 2022 Well Abandoned 18 56 14 71 4908.06 17 93 14.18 4901.70 Well Not Installed Well Not Installed Well Not tnstaled June 2022 Well Abandoned 18.33 14.48 4908.29 17.45 13.70 4902.18 Well Not Installed Well Not Installed Well Not installed July 2022 Well Abandoned 17.00 13.15 490962 18.23 14.48 4901.40 Well Not Installed Well Not Installed Well Not Installed August 2022 Well Abandoned 18 11 14 9 4908.51 18.8? 15.07 4900.81 Well Not Installed Well Not Installed Well Not Installed September 2022 Well Abandoned IR 16 14 31 4908 46 19 13 15 38 4900.50 Well Not Installed Well Not Installed Well Not Installed October 2022 Well Abandonwd 18.24 14 39 4908.38 19.66 15 91 4899.97 Well Not Installed Well Not Installed Well Not Installed November 2022 Well Abandoned 18 50 14,65 4908 12 20 26 16.51 4899.37 Well Not Installed Well Not Instanect Well Not Installed December 1022 Well Abandoned 18.77 14 9? 4907.85 20 35 16 60 4899.28 Well Not Installed Well Not Installed Well Not Installed January 2023 Well Abandoned 18 43 14.58 4908.19 19 79 16.04 4899.84 Well Not Installed Well Not Inctallen Well Nat Installed February 2023 Well Abandoned 18.31 14.46 4908.31 20.29 16 54 4899.34 Well Not Installed Well Not Installed Weil Not Installed March 7073 Well Abandoned 18.67 14 77 4908.00 70.31 16 56 4899.32 Well Not Installed Well Not Installed Well Not Installed April 1023 Well Abandoned 70.00 16.15 4906.67. 20 56 16.81 41199.07 Well Not Installed Well Not Installed Well Not Installed May 2023 Well Abandoned 19.34 15 49 4907.28 19 82 16 07 4899.81 Well Not Installed Well Not In•.tallerl Well Not installed lune 2023 Well Abandoned 17.81 1396 4908-81 14,99 11 2' 4904,64 15.90 12 98 4907.21 I n7 4 91 4911.94 9.92 / 14 4909-11 July 2023 Well Abandoned 18 26 14 41 4908.16 15 58 11 8.4 4904.05 17.54 14 6. 4905.59 8 12 r 2,, 4911 64 .10 71 ? '1.1 4908 37 August 2013 Well Abandoned 10.38 16 53 4906 24 17 85 14.10 4901.78 19.75 16.83 1903.38 10.52 149 4909.44 12.98 10.20 4906.05 September 2023 Well Abandoned 20.67 16.82 4905.95 18.56 1.81 4901.07 19.94 17.02 4903.19 10.69 166 4909.27 13.44 10.66 4905 59 October 2073 Well Abandoned 21.36 17 51 4905.26 19.17 15 42 4900,46 19 87 16.95 4903.26 10.45 ' 42 4909.51 13 34 10.56 4905.69 November 2023 Well Abandoned 21.37 17 47 4905.30 19.65 15 90 4899.98 20 76 17 34 4902.87 10.64 7 61 4909 3? 13 95 11.17 4905.08 December 2023 Well Abandoned 21.49 17.64 4905,13 , 20.3.7 16 62 4899.26 20.41 1; 49 4902.72 10.87 784 4909.09 14 21 11.43 4904.82 Januar; 2023 Well Abandoned 21.54 17 rr• 4905.08 20.70 It. ''r-. 4898.93 20,84 17.02 4902.29 11.48 R 45 4908.48 14.97 12.19 4904 06 fetxuxy 2023 Well Abandoned 2? 14 18:' 4904 48 !07% 1 7I•' 41198 in lo 6; 17 71 4902.48 11 57 8.14 4908 19 15,23 17 ,tri 4003.97'7 Groundwater Elevation (High) Well Abandoned 17 00 13.15 4909.62 14.99 11.24 4904.64 15.90 12.98 4907.23 7.07 4.04 4912.89 9.92 7.14 4909.11 Groundwater 1levation (tow) Well Abandoned 22.14 18,29 4904 48 2n P. 1700 469R R8 70 Y.M 11.92 4902.29 11.57 8,54 4909 39 15 23 17.45 4903.80 GW Elevation Difference (It) = Well Abandoned 5.14 s. le, 4 94 4.50 5 31 Note. a Htsttac High GW Elevation ags • above ground surface artist • above mean sea level bes • below ground surface h • feet 10C • lop of Cas:ng Table 1 Chavers Mining Resource Groundwater Quality Standards Table 2 Analytes CAS No. Units INS Table 1 INS Table 2 INS Table 3 • INS Table 4 Lowest INS Tables 1 - 4 Groundwater Quality Standards Chavers Groundwater Quality Standards Domestic Water Supply: Human Health Standards Domestic Water Supply: Drinking Water Standards Agricultural Standards TDS Water Quaity Standards Dissolved Aluminum 7429-90-5 mg;L — — 5 - 5 5 Antimony 7440-36-0 mg/L 0.006 - -- 0.006 0.006 Arsenic 7440-38-2 mg/L 0.01 0 1 -- 0.01 0.01 Banum 7440-39-3 mg/L 2 - — -- 2 2 Beryllium 7440-41-7 mg/L 0.004 - 0 1 - 0.004 0.004 Boron 7440-42-8 mg/L - -- i 0.75 -- 0.75 0.75 Cadmium 7440-43-9 mg/L 0,005 - 0.01 - 0.005 0.005 Chloride 16887-00-6 mg/L - `50 - - 250 250 Chromium (Total) [GrillI) + Cr(VI)j 7440-47-3 mg/L 0.1 - 0.1 -- 0.1 0.1 Cobalt 7440-48-4 mg/L - -- 0.05 -- 0.05 0.05 Copper 7440-50-8 mg/L -- • 0.2 - 0.2 0.2 Flounde 16984-48-8 a mg/L 4 - 2 2 2 Iron 7439-89-6 mg/L — 0.3 5 -- 0.3 0.3 Lead 7439-92-1 mg/L 0 05 - 0.1 -- 0.05 0.05 Lithium 7439-93-2 mg/L -- -- 2.5 - 2.5 2.5 Manganese 7439-96-5 mg/L -- 0.05 0.2 -- 0.05 0.397 Molybdenum 7439-98-7 mg/L 0.21 -- - - 0.21 0.21 Nickel 7440-02-0 mg/L 0.1 -- 0 2 -- 0.1 0.1 Nitrate (NO3) 14797-55-8 mg/L 10 - - -- 10 10 Nitrite (N02) 14797-65-0 mg/ 1 -- 10 — 1 1 Nitrate -Nitrite. Total (NO2 +NO3) -- mg/L 10 -- 100 -- 10 10 Selenium 7782-49-2 mg/L 0.05 - 0.02 - 0.02 0.02 Silver 7440-22-4 mg/L 0.05 -- - -- 0.05 0.05 Sulfate 14808-79-8 mg/L - 250 - - 250 301.12 Thallium 7440-28-0 mg/L 0.002 -- - • - 0.002 0-002 Total Dissolved Solids (TDS) 10-33-3 mg/L — -- - Based on Result 1.25 x Background 1267.5 Uranium 7440-61-1 mg/L 0.03 -- - - 0.03 0.03 Vanadium 7440-62-2 mg/L - - 0. 1 - 0.1 0.1 Zinc 7440-66-6 mgr'L — 7 — 2 2 Other pH - ngL 65-8.5-?' -- 1 6.5-8.5 6.5-8.5 Notes: = Lowest INS Table 1 - 4 Standard = Groundwater Quality Standard per Lowest INS Table 1 - 4 Standard = Site -specific Groundwater Quality Standard per Baseline Sampling Results All samples are filtered through 0.45 micron filter prior to preservation Parameters Excluded from Groundwater Monitoring Program: INS Table 1 INS Table 2 INS Table 3 INS Table 4 Total Coliforms (30 day average) Chlorophenol Mercury None Total Coliforms (max in 30 days) Color Asbestos Corrosivity Cyanide [Free] Foaming Agents Mercury Odor Gross Alpha Particle Activity Phenol Beta and Photon Emitters Chavers Mining Resource Baseline Groundwater Quality Results First Five (5) Quarters of Data 1st Quarter 2022 - 1st Quarter 2023 Table 3 Anahet erParanxlers CAS Na_ Sample Event: 1st Quarter Sampling Event Ind Quarter Sampling Event 3rd Quarter Sampling Event 4th Quarter San filing Event 5th Quarter Sampling Event Chavers Site -Specific Groundwater Quality Standards Well Type: BKG Wells (Up -gradient) BKG Welts (Up -gradient) BKG Wells (Up -gradient) BKG Wells (Up -gradient) BKG Wells (Up -gradient) Lowest Sample ID: MW-2 MW -3 MW 3 MW -2 MIN -20 W MW -3 MW -2 MW -3 MW -3D MW -2D MW MW -3 MW-2 PAW -3 MW -3D INS Tables 1 • 4 Date: 3►2912022 3/2912022 3/29/2022 6/2812022 6/28/2022 6/2V2022 9/21/2022 912112022 9121/2022 121612022 124/2022 12/6/2022 3/3012023 3/3012023 3130/2023 Groundwater Type: Grab Grab QA/OC Grab QA QC Grab Grab Grab QA1QC Grab QA/QC Grab Grab Grab QA/QC Quality Standards Units mg&L mg/L mg/L mg/L mgll mg& mg/L mg/L ngll mg•t mg1L mg/l nick mg& mgt! Disc. :, : J :; wn gum 742940-5 mgl 0.009 0.010 0.018 0.012 0.011 0.006 0.010 0.031 0.026 0.037 0.042 0.017 0.034 0.009 0.011 5 6 Antimony 7440-36.0 mgt 0.0012 U 0.0012 U 0.0012 U 0.0012 U 0,0012 U 0.0012 U 0.0012 U 0.0012 U 0 0012 U 0.0012 U 0.0012 U 0.0012 U 0.0012 U 0.0012 U 0.0012 U 0.006 0.006 Arsenic 7440-36.2 mgL 0 0006 U 0.0006 U 0.0006 U 0.0006 U 0 0006 U 0.0006 U 0.0006 U 0.0006 U 0.0006 U 0.0006 U 0.0006 U 0.0006 U 0.0006 U 0 0006 U 0.0006 U 0.01 0.01 Barium Beryllium Boron 7440-39-3 7440-41-7 7440 42.8 mg/L mg/I 0.0!18 U 0.0695 0.0682 0.104 U 0.1064 U 0.0628 0.1038 0.0897 0.0704 4 0.126 0.1228 0.0767 0.1044 0.0004 0.0596 U 2 2 0.004 00001 0.0001 U 0.0001 U 0.0001 0.0001 0.0001 U 0 0001 U 0 0001 U 0.0001 U 0.0001 U 0.0001 U 0.0001 U 0 0001 U ~ 0.0001 U 0.0001 0.004 rt+p/L 0.21 0.33 0.35 0.18 0.18 0.47 0.22 0.66 0.56 0.20 0.26 0.46 0.22 0.38 0.38 0.76 0.76 Cadmium 7440-43-9 mg& 0.0001 0 0001 U 00001 U 0.0001 0.0001 0 0001 U 0.0001 U 0.0001 U 0.0001 U 0.0001 U 0.0001 U 0 0001 U 0.0001 U 0.0001 U 0.0001 U 0.006 0.006 Chloride 16887-004 mall 152.94 225.37 224.67 151.23 152.94 232.65 164.63 231.4$ 237.28 187.09 188.42 229.83 199.55 206.15 207.31 250 260 Chromium (Total) (Cron) • Cr(VI)) Cobalt Copper 7440-47.3 7440-48-4 7440-50-8 mg/L mg4 mgr!. _ 0.0015 0.0018 0.0019 U 0.0015 0.0006 U 0.0015 0.0006 0.0014 U 0.0015 U 0.0015 U 0.0015 U 0.0015 U 0.0015 U 0.0015 U 0.0015 U 0.0015 U 00015 U _ 0.0015 U 00015 U 0.0015 U 0.1 0.1 0.0021 _ 0.0021 0.0006 0.0022 0.0006 0.0017 0.0006 0.002 0.002 0.0005 0.0019 0.0007 0.0007 0.06 0.05 0.0014 0.002 0.002 _ 0.0018 0.0018 0.0016 0.0017 0.0017 0.0016 0.0013 0.001 0.001 0.2 02 Flounde 16984-48.8 mgr. 1.06 1.61 1.62 1.07 108 1.46 0.86 1.16 1.2 1.2 1.2 1.36 1 U 1.41 1.44 2 _ 2 Iron 7439-89-6 m94- 0.016 0.013 0.021 0.005 U 0 005 U 0.005 U 0.008 0.006 0.005 0.007 0.008 0.007 0.011 0 005 U 0 005 U 0.3 0.3 Lead 7439-92.1 mg. 0.0001 U 0.0001 U 0 0001 U 0-0001 U 0 0001 U 0.0001 4 U 0.0001 U 0.0001 U 0-0001 U 0 0001 U 0 0001 U 0.0001 U 0 0001 U 0.0001 U 0.0001 U 0.05 0.05 Lithium Manganese Molybdenum 743943-2 7439-96-5 7439-98-7 mg/L m911- myl 0.04 0.0192 0.0096 0.04 0.0008 0.0161 U 0.04 0.0008 0.0146 U 005 0.0213 U 005 0.0176 0.0098 U 0.05 0.0014 0.0164 U 0.06 U 0.05 00008 U U 005 0.0008 U U 005 U 005 U 0.06 0.0008 U U 0.03 0.0021 0.03 0.03 2.6 2.6 0 0008 0.007 0.002 0.0017 0.0018 0.0024 0.06 0.21 0.397 0.21 0.0102 0.0117 0.0116 0.008 0.0077 0.0071 0.0001 0.0131 0.0129 Nickel 7440.02-0 mgl 0.0027 0.0028 0.0027 0.0029 0.0028 0.0028 0.0028 0.0028 0.0027 0.0026 0.0027 0.0026 0.0026 0.0023 0.0023 0.1 1 0.1 Nitrate (403) 14797-554 rues! 7.41 6.31 6.27 2.67 2.59 1.19 4.36 1.07 1.08 4.13 4.21 2.63 r 3.41 3.78 3.81 10 10 Nitrite M02) 14797-65-0 MIA 0.03 U 0.03 U 0.03 U 0.03 U 003 U 0.03 U 003 U 0.03 U 003 U a03 U 003 U 003 U 0.3 U 0.3 U 0.3 U 1 1 Nitrate -Nitrite Total (402 •I403) Selenium Stever - 7782-49-2 7440-22-4 mgr. mgr. mg/L 7.41 0.0016 0.0005 U 6.31 0.0021 0.0005 U 5.27 0.002 0.0005 _ 2.17 2.69 0.0012 U 1.19 0.0013 0.0005 U 4.36 U 1.67 0.0022 0.0005 U 1.68 0.002 0.0005 U 4.13 4.21 2.63 3.46 0 0008 U 3.78 301 U 10 10 U 0.001 0.0029 0.0005 0.0022 0.0005 U 0.0016 0.0005 U 0.0016 0.0012 U 0.0009 0.02 0.02 0.0005 U 0.0005 0 0005 U 0.0005 U 0.0005 0.0005 0.06 0.06 Sulfate 14808.79-8 mg& 194.82 301.12 299.96 217.05 220.8 280.63 218.16 292.62 286.04 231.22 231.87 285.12 201.31 237.66 239.2 260 301.12 Thallium 7440-28-0 rng. 0.0002 U 0.0002 U 0 0002 U 0 0002 U 0 0002 U 0 0002 U 0 0002 U 0 000_` U 0 0002 U 0 0002 U 0 0002 U 0 0002 U 0.0002 U 0 0002 U 0.0002 U 0.002 0.002 Total Dissolved Solds (IDS) Uranium Vanadium 10-33-3 - 744041-1 744042-2 mg/L mgt. ng/L 776 00071 0 001 U 979 0.0264 0.001 U 973 0.0253 0 001 U 783 0.0077 0.001 U 780 0.0073 0 001 U 884 0.0067 0.001 U 766 0.0071 0.001 U 1014 U 1008 - U 810 0.007 0 001 U 896 0.0072 0 001 U 996 0.0069 0 001 U 823 0.0037 0.001 U _ 888 0.0161 0.001 U 892 0.0148 0.001 U 1267.5' 1287.6 0.0171 0.001 0.0176 0.001 0.03 0.03 0.1 0.1 Zinc 7440-86-6 . L 0.001 0 001 U 0.001 U 0.001 0 001 U 0.001 0 001 U 0.001 U 0.001 U 0.001 U 0.001 U 0.001 0.001 U 0.001 U 0.001 U 2 2 ------_t-_- pH — su 7.6 7.7 7.6 7.6 7.3 7.5 6 9 7.1 7.2 - 6 ' 6.7 6.6 7.0 7.3 7.4 6.5 - 8.5 6 5 • 8.5 Notes = Chavers Site -Specific Groundwater'Duality Standard value = Source of Chavers Site -Specific Groundwater Quality Standard value = Background concentration result exceeds lowest applicable INS Tables 1 - 4 standard = Highest Background IDS value Bold = Concentration detected above reporting limit = Calculated Value (Per WOCC Regulation No 41. for Background IDS Value between 501 - 10.000 mq'L. the Maximum Allowable TDS Concentration is 1 25 times the background value) BKG = Background INS = interim llarratrve Standard mg -t = milligrams per liter P'DC = Point of Compliance su = standard unit U = &nalyte not detected above reporting limit WOCC = Water Quality Control Commission Chavers Mining Resource Baseline Groundwater Quality Results Last Three (3) Quarters of Data 2nd Quarter 2023 - 4th Quarter 2023 Table 4 AnalyM/Perornate? s CAS No. Sample Event. 6th Quarter Sampling Event 71h Quarter Sampling Event tSth Quarter Sampling Event Chaves 5 Site -Specific Groundwater Quality Standards Weil Type BKG Welts alp -gradient) POC Wells (Dovr,a-r)radiem) BKG W.IIs (Up -gradient) POC Wells Mown -gradient) 8KG Well (UP,rodrenl) POC Wells Mown -gradient) Lowest __Simper ID_ MW -2 MW -3 MW4 MW.4O MW -6 MW -6 MW -2 MW -3 MW -4 MW -6 MW -,D MW -r MW -2 MW -3 MW -4 MW -6 MW -6 MW40 NS Tables 1 -4 Dale, 6(2912023 6/2012023 6/2912023 6129/2023 6/30/2023 6:10/2023 9/26/2023 9126!2023 $12612023 9(2112023 9/26/2023 312612023 12/1412023 12/1512023 12/1512023 12115/2023 12115/2023 12115/2023 Groundwater Type Grab Grab Grab QAIQC Grab Grab Grab Grab Grab Grab QA+QC Grab Grab Grab Grab Grab Grab QA/CC Quality Standards Units my1L mgL IngEL mall mg& mg& mgfL mgA- mgt. m9►L rngrl mg/ . my/L mglt mg1L malt. nptl ing/L >•ssofvrd _ S Aluminum Antimony 7429-90-5 mgt 0.007 0.005 0.013 0.014 U 0.0017 0.022 2.47 0.026 0.022 0.011 0.008 0.003 0.01 0.003 0.002 0.004 0.003 0.0012 U 0.003 5 S 7440-36-0 mwL 0.0012 U 0.0012 U 0.0012 U 0.0012 0.0012 U 0.0012 U 0.0012 U 0.0012 U _ 0.0012 U 0.0012 U 0.0012 U 0.0012 U 0.0012 U 0.0012 U 0.0012 U 0.0012 U 0.0012 U 0.006 0.006 Arsenic 7440-38.2 mg: L 0.0006 U 0.0006 U 0.0014 0.0011 0.0007 0.0007 0.001 0.0006 U 0.0009 0.001 0.0011 0.0012 0.0006 U 0.0006 U 0.0008 0.0007 0.0009 0.0008 0.01 0.01 Plenum 744049.3 mg l, 0.0932 0.0531 00488 0.0473 0.0214 0.063 0.1632 0.0464 04737 0.0704 0.0708 0.0704 0.08 0.0181 0.0773 0.0634 0.0696 0.0667 2 2 Bnry*um 7440.41-7 744042-0 7440.434 16667-004 mgt. 0.0001 0.23 U 0.0001 0.44 0.0001 201.83 U U 0.0001 0.1 0.0001 U 0.0001 U 0.0001 U 0.0001 U 0.0003 0.0001 U' 0.0001 U 0.0001 U 0.0001 U 0.0001 _ U 0.0001 U 0.0001 U 0.0001 U 0.0001 U 0.0001 U 0.0001 U 0.004 0.004 0.75 Boron Cadmium Chloride rook mg/L mg1L 0.1 0.07 0.0001 U 0.13 0.2 0.3 0.21 022 U 0.22 U 0.19 0.0001 0.4 0.0001 U 0.31 0,0001 U 0.25 0.24 0.0003 179 025 0.0006 0.24 0.0006 196 0.76 0.0001 0.0001 0.0002 0.0002 0.0001 U 0.0001 U 0,0001 0.0001 0.0003 185 0.005 0.005 250 178.22 72.06 73.71 67.70 73.22 221 164 160 169 110 166 166 209 196 250 Chromium (Total) (COO) • Cs(VT)) 7440.47-3 mg/ 0.0015 U 0.0015 U 0.0015 U 0.0015 U 0.0015 U 0.0015 U 0.002 0.0015 U 0.0015 U 0.0015 U 0.0015 U 0.0016 U 0.0015 U 0.0015 U 0.0015 U 0.0015 U 0.0015 U 0.0015 U 0.1 0.1 Cabal 7440.484 mg/I 0.0011 0.0008 0.0003 0.0003 0.0002 U 0.0003 0.0025 0.0006 0.0003 0.0006 0.0005 0.0004 0.0009 0.0004 0.0006 0.0009 0.0006 0.0006 0.05 0.05 copper Flourkle Iran 744040.6 1690448-0 7438.894 mg& mg/L mg4. 0.0017 0.0016 1.32 0.0066 0.0062 0.0021 0.0111 0.0064 0.0013 1.59 0.0054 0.8 0.0028 0.0027 0.0066 0.0011 0.001 0.0077 0.0028 0.0104 0.0108 0.2 0.2 1.03 1 U U 1 U 0.76 1.61 1.09 0,92 0.89 0.71 0.94 1.26 0.62 0.77 0.77 0.78 2 2 0.005 U 0,005 U 0.005 0.01 0.015 0.016 0.018 0.007 0.01 0.005 U 0.005 U 0.005 U 0.006 U 0.005 U 0.005 0.014 0.005 0.005 0.3 0.3 Lead 743992-1 mg/I. 0.0001 U 0.0001 U 0.0001 U 0.0001 U 0.0001 U 0.0002 0.0047 0.0001 U 0.0001 U 0.0001 U 0.0001 U 0.0001 U 0.0001 U 0.0001 U 0.0001 0.0002 0.0002 0.0002 0.05 006 Lithium 743943-2. mg/1. 0.026 0.024 0.025 0.025 0.013 0.026 0.031 0.03 0.04 0.04 0.04 0.04 0.026 0.028 0.037 0.036 0.036 0.036 2.5 2.5 Manganese 7439-965 rigs. 0.0062 0.0008 U 0.022 0.0246 0.0028 0.0291 0.397 0.0008 0.0019 0.0015 0.0013 0.0006 U 0.0021 0.0008 U 0.0017 0.0028 0.0017 0.002 0.05 0.397 Molybdenum Nickel Nitrate /NO)) 7434.98-7 7440.02-0 1479745.4 mg/L mg/L mg/L 0.00% 0.0023 2.36 0.0127 0.0024 1.76 0.0053 0.0015 3.86 0.0063 0.0016 3.87 0.0031 0.0009 1.24 U c 0.0018 0.0014 0.005 0.0145 0.0016 0.0068 0.0088 0.0089 0,0023 244 0.0077 0.0019 0.0078 0.0022 0.0119 0.006 0.0023 0.006 0.0065 0.0067 0.0023 3.65 0.21 021 0.1 0.0042 0.0017 3.04 0.0023 0.002 0.0024 3.78 0.0023 0.1 0.17 3.89 125 2.67 2.88 2.75 1.5 3.89 3.67 10 10 Narita (N021 1479745.0 mg/L 0.3 U 0.3 U 0.3 )t 0.3 U 0.03 U 0.03 U 0.03 U 0.03 U 0.03 U 0.03 U 0.03 U 0.03 U 0.03 U 0.03 U 0.03 U 0.03 U 0.03 U 0.03 U 1 1 Nomin-NIrle. Thal {1402 •NO3) - mg& 2.36 1.71 4 3.86 3.87 1.24 0.17 3.89 1.25 3.04 2.67 2.64 2.88 2.75 1.5 3.88 3.78 3.67 3.65 - 10 10 Sabmi rm Silver Sulfate Thallium 778249.2 7440.22-4 14808.79.8 7440.28-0 mg/L mall mgr. rag& 0.0013 0.0005 179.7 0.0002 U U 0.0019 0.0005 243.78 U 0.0026 U 0.0024 0.0005 99.1 U U 0.0008 0.0005 U U 0.0009 0.0005 U U 0.0023 0.0005 U 0.002 0.0005 185 U U 0.0022 0.0005 U 0.0018 0.0005 190 U 0.0019 U 0.0024 0.0011 U 0.0023 0.0005 U 0.0018 U 0.0008 0.0005 167 U 0.0016 0.0005 1.66 U 0.0017 0.0006 U 0.02 0.02 0.0005 98.61 0.0005 0.0005 U 0.0005 0,0005 0.05 0.05 59.17 10625 0.0002 U 175 0.0002 U 188 190 184 170 232 168 167 U 250 0.002 301.12 0.0002 U 0.0002 U 0.0002 0.0002 U 0.0002 0.0002 U 0.0002 U 0.0002 U 0.0002 U 0.0002 U 0.0002 U 0.0002 U 0.0002 U 0.0002 U 0.0002 0.002 Total Desoleed Scads (TDS) 10-33-3 mg/L 890 887 427 460 294 545 723 540 628 683 697 685 687 866 700 719 768 717 1267.5 1267.5 Uranium 7440-61-1 mgrs, 0.0055 0.0157 0.0008 0.0006 0.0029 0.0021 0.0057 0.0088 0.0108 0.0083 0.0084 0.0088 0.0037 0.0158 0.0087 0.0078 0.0089 00088 0.03 0.03 Vanadium Zinc '44042-2 744046.6 mg/L mg/l. 0.001 0.001 U U 0.001 0.001 U U 0.002 0.002 0.002 0.001 0.001 0.012 U 0.004 0.012 0.001 0.001 U U 0.002 0.001 0.001 0.002 0.001 U U 0.001 U U 0.001 0.003 0.001 0.025 U 0.001 0.001 0.009 0.1 0.1 0.002 0.003 0.001 0.001 0.006 0.003 0.001 0.001 0.009 2 2 pH - sr 7.3 7.7 7.0 6.9 7.2 6.6 7.0 7.2 6.8 74 7.4 7.0 7.2 7.3 7.2 7.2 72 7.3 6.6-8.5 6.5-8.5 Hates Bold BKG INS mat 1. POC 541 I) wocc = Chaver% Sae.Sp..cifw. Grnundva for Otinkty Standard value • $:sour of Chavers S4e-Stw.c/fIc Groundwater Ouatly Standard value a Background concentration result exca.:ds lowest applicable INS Table-. 1 - 4 standard = elighnct Background TDS value = Concentration *dotted alnwo rnpolling limit = Calculated Vnkuo (Per WOCC Regulation No. 41 for Background TDS Value between 501 - 10.000 map/L. the Mnmium Allowable IDS Concentration es 1.25 trawls the background value) = Background Interim Narrntrvn Standard = mr4grnne. per liter = Pom1 of Cnmµ.kunc.. • atan(taad unit = Annlyto not deterfed above rnr.ndrnn Wit • Wale; Quality Control Cnnurnacron APPENDIX A MONITORING WELL CONSTRUCTION LOGS ASPHALT SPECIALTIES C O . 10100 Dallas Street Henderson, CO 80640 Phone: 303-289-8555 Asphalt Specialties Co., Inc. Chavers Mining Resource Monitoring Well Construction Log: MW -2 Date: 1 111 7/2 01 6 Well Material: 2" Schedule 40 PVC Drilling Company:Terracon Well Lat. I Long.: 40.046245° /404.820551° Drilling Method: Hollow Stem Auger (HSA) Ground Elevation: 4,922.77 ft amsl = n a S' c GRAPHx: LOG LITHOLOGIC DESCRIPTION WELL CONSTRUCTION APPRox. DEPTH TO WATER o c g . t . - 3_ -2 _ - 1_ 0 - 4.926_, 4.925 4.924 _ 4,923 Ground Surface Silt, dark brown, dry (Overburden) 5 6 _ 8 9 _ 10 11 _ 12 _ 14 15 18 17 19.'+'-:;^ 20' 21 = 22,.::vr`...€a-Vita 23 24 25 26 _ 27- 28 29 30 32 _ 33 4.922 4,927 _ 4,920 4,919 _ 4,918 4,917 _ 4,916 4.915_ 4,914 _ 4,913 _ 4,912- 4,911 _ 4,909 4.908 - 4.907 _ 4,906 _ 4.905 - 4,904_ 4.903 _ - 4.902 _ 4,901 _ 4,900 _:- 4,a_ 4,898 - 4,897 _ 4,896- 4.895 - 4,894 4,893_. 4.892 — 4,891 - 4,890 - 4.889 t k'�..sz:'::'�r•:w -..\:•k#.•.�.4 k•^.{�,:.:�..4 i :fit `:5 -� t: %Yr'^lo- �' :ts ta•;: r9' d -.� "kK.,��s.:��--, ', '�? �5f=- x°. : 3, �....¢.,,. §-g �� r..r .. ,. , tx"s , _.•.':, • �•::- .,: "...:�sv_..� •""' •,..:d',:i.- �...,,.p..4�.: a$t - •• :n:` .a.%. t, Sand and gavel, tan, dry (Alluvium) • $x'5we•xac-+�'t.: r.s wa x>. xi'�3 .�.+,.. g, ro..;,. ,,.,r,;.;.... a�,.pr kt�. - ;,S.,, �, zatiyt <-. c,•r .'C r{ u� Xtn,,,t, K.I1111JJlL1II_llii[1Jj1tiU.1111[11lltil1llllllt1111111EII1111 Illlil Mill_I1I1IIII.lilt . • :Fs �..y as , a, i ++nnfi.≤; Y •- - • Sand and gavel, tan, wet (Alluvium) 20 ft Ns I� IIIi ��I II, Top of Shale encountered at 34.5 feet bgs (Bedrock) ASPHALT SPECIALTIES CO. 10100 Dallas Street Henderson, CO 80640 Phone: 303-289-8555 Asphalt Specialties Co., Inc. Chavers Mining Resource Monitoring Well Construction Log: MW -3 Date: 11117/2016 Well Material: 2" Schedule 40 PVC Drilling Company: Terracon Well Lat. / Long.: 40.050300.1-104.820150. Drilling Method: Hollow Stem Auger (HSA) Ground Elevation: 4,915.88 ft amsl w ,.. GRAPHIC LOG LITHOLOGIC DESCRIPTION WELL CONSTRUCTION APPROX. DEPTH TO WATER (Drilling) w x 3 -2_ -1- Concrete Pad `Protective Casing 4.616_ 4.918= 4.917_ 4,916 Ground Surface Sandy silt, dark brown, dry (Overburden) - 0J N f % // % / •. ,( L 4915 4,914 _ 4,913 _ 4,912 _ 4,911 _ 4,910 _ - 4£09_ 4.906 4,907 _ 4,906 4.905 4,904 _ 4,903 4.902 _ 4.901 4,900_ 4,899 4,898 _ 4,897 = 4,896_ 4,885 _ 4,894 _ 4,893 __ 4.892 4,891 _ 4,890 _ 4,889 _ 4.868_ 4.887 _ 4,886 _ 4,885 _ 4,883 g. -O C N Ce 7"", 9 10 11 12 13 14x 15 1sr.;� 17 18 i.;.t ?' 2 �. a'h.4r,s r�, .,t'y: i:; `. c }� r W1 :1s A• t.-�re ,.�: � Sand and gavel, tan, dry (Alluvium) CO WS O. C N ...,..A U V% 0 N O t '; es ^{ k . r { t ,;r y�:,--- la ,•yc " ^- sYj . t -may,. y g'� .`•; 3., ;...' ,s- .+r< o. •- .. mo=t 41 U 19 t.^ xr',;.• Sand and gavel, tan, wet (Alluvium) � Y 18. bgs 24,:. 25 7•' 30 31 33 p xt tvo y2.•,7 1Y, n,,' x`'�,' nor};,z. ..:r: ,��. -T�". x r - _ .. �„ ,: .."'� {' -�{•'" �.. - ,. 1.Q r-1 0 ci Top of Shale encountered at 33 feet bgs (Bedrock) ASPHALT SPECIALTIES C O . 10100 ballas Street Henderson, Co 80640 Phone: 303-289-8555 Asphalt Specialties Co., Inc. Chavers Mining Resource Monitoring Well Construction Log: MW -4 Date: 6/22/2023 Well Material: 2" Schedule 40 PVC Dulling Company: Terracon Well Lat. I Long.: 40.047449° / -104.824594° Drilling Method: Hollow Stem Auger (HSA) Ground Elevation: 4,920.21 ft amsl I I s �Hic LITHOLOGIC DESCRIPTION WELL CONSTRUCTION aPPaox. DEPROX. WATER (Drilling) a C w `. -3- -2_ -' -' - Concrete Pad 1 Protective Casing 4.923_ 4.922_ 4.921 _ 4,926 0 2 — Ground Surface Sandy silt, dark brown, dry (Overburden) f0 N 4,919 4,918 _ 4,917 4,916 _ 4,915CU _ 4,913 - 4,912- _ 4,911 4,910 _ 4,909 _ 4.908 _ 4,907 - 4,905 4.904 - 4,903.- 4,902_Ln 4,900 - 4899_ 4,898 _ 4.897 _ 4.896 _ 4,895 _ 4.894 _ 4,893 _ 4,892 4,891 _ 4,890 _.. 3 _ Sand and gavel, tan, dry (Alluvium) aJ 5 9 10. 11 12 7 1 � ! •,yi S^• fi,:ob �-w...,r k< moisture present at --7 ft bgs C ,c V ca CL C �T4► 3 • - � A:• � 'tk � '.: � scc ' Sin' fl,:= •tt; }w .$s � r ff, 14 15 16 181' 20 Jt,y< "." nj=� 1k.; k 3" •� a{ 7 , Sand and gavel, tan, wet (Alluvium) _ N CNI O ` �_s v ) y" ., -. C CL L i 13 R bgs4.906 2 1•r'3y 22 24 25 27£�1f 28 29 �_., .� X .;" m� ��''�4 . L ti..'�: _' C ( �, �I u` . ek; -/'',��:. . ii -, .. vs. hR O r -I O Total Depth of Boring 30 feet bgs ASPHALT SPECIALTIES C O . 10100 Dallas Street Henderson, CO 8064O Phone: 303-289-8555 Asphalt Specialties Co., Inc. Chavers Mining Resource Monitoring Well Construction Log: MW -5 Date: 6/28/2023 Well Material: 2" Schedule 40 PVC Drilling Company: Terracon Well Lat. / Long.: 40.051625" / -104.823754° Drilling Method: Hollow Stem Auger (HSA) Ground Elevation: 4,916.93 ft amsl gg, L p v GRAPHIC LO LITHOLOGIC DESCRIPTION WELL CONSTRUCTION APPROX. DEPTHTO WATER (DM. 'a e _ 3 _2 Concrete Pad \ Protective Casing 4.920_ 4.919_ 4.s18_ 4,917 1 - 2 _ Ground Surface Sandy silt, dark brown, dry (Overburden) - - . 70 N / • j :;; 4—, 4,918 4.915_ 4,914 _ 4,913 - 4.912 _ 4.911 _ 4.910 _ 4.909 _ 4.906 _ 4.907 _ 4,906_ 4.905_ 4.904 _ 4,903 _ 4.902 _ 4.901 _ 4,900 _ 4,899 _ 4.896_ 4.897 _ 4.896_ 4.895 _ 4894 _ 4.893 - 4.892 4.891 4,890 _ 4.889 _ 4.888 _ 4.887 a - 5 - .. ... Sand and gavel, tan, dry (Alluvium) �+ O i - ≥ tx=•, `:�� CC 7 10 11 12 13 14 1 5 1 17 16 19 20..,,,- ;1...,.'Y••y3;. '� ? t. j1 c:. 7i �s.•+Yr `. /afr a .k^ { ,s M �� <:�: -a:., ,b:- Sand and gavel, tang wet (Alluvium) Y f0 C („).- Ln t0 N O `�"` ' �� ; rue ; & _%, z ,, S�'4rr �e'1 '� "k. i w - .. - '_.: 4 a,; .? -:.,... ' " : .. ,�. �F LS L TS 5.5 ft b s 21 22 24 26 27 28 29 30 4,,.,2,r.,.,n. s 4at.. c i% u,•.:> -23 Zw:" ' *a n•��t �" { r ;�Frti. +''T ?`� r �...x .I,. - -✓F. i"%�3'� r,.b ^10.25 wr ,�. t w h`:,i -� g, ,mot: `-� '¢� y rf Viral . "' \ f'-�''3' 'S ... N _ 0 i Top of Shale encountered at 30 feet bgs (Bedrock) ASPHALT SPECIALTIES CO. 10100 Dallas Street Henderson, CO 80640 Phone: 303-289-8555 Asphalt Specialties Co., Inc. Chavers Mining Resource Monitoring Well Construction Log: MW -6 Date: 6/28/2023 Well Material: 2" Schedule 40 PVC Drilling Company:Terracon Well Lat. l Long,: 40.053389" / -104.822248° Drilling Method: Hollow Stem Auger (HSA) Ground Elevation: 4,916.25 ft amsl w 8 p GRAL IC LITHOLOGIC DESCRIPTION WELL CONSTRUCTION APPROX. DEPTH TO WATER (Drilling) ii = I "E , m w C -3- -2- -1 - Concrete Pad \ Protective Casing 4.919_ 4.918_ 4.917_ 4,916 0 Ground Surface Sandy silt, dark brown, dry (Overburden)1.71 4,,,,,,,.. , (n 4% . ,: • ' ., . , L CB 4.915 = 4,914 _ 4,913 -_- _ 4,912 _ 4,911 4,910 _ 4.9 _ _ 4,907 _ 4,906 _ 4.905 _ 4,904 _ _ 4.903 _ 4.902_ 4,901 _ 4,900 _ 4,899 _ 4,898 _ 4,896 _ _ 4,894 _ 4.893 ._ 4,692 _ 4,891 _ 4,890 _ - 4,889 _ 4,888 4,867 L.- 4,886 zz2 :iu:us r,b v;4_ 111 2 ; Sand and gavel, tan, dry (Alluvium) N CO V' s_:-vxr: ^k- rK ;. 9 10 12 13 15 16 17 20 k ?r;,ypt-rx -, Sf . . S ,; ! Sand and gavel, tan, wet (Alluvium) , 5 -...! (.J N N C 4 ' ". > a r _', . f^r,, 13 N t4,895 7 ft gs4,908 22 23 25 26 27 28 - 30 .fir:.; kr "-`ii $:s `rr 1. �,-•:, x Q v ra �.�� _u.' tiJ' Y" ;ry YSS1,. ,F. y' N Q 1,,.) Total Depth of Boring 30 feet bgs ATTACHMENT 3 INTEGRATED NOXIOUS WEED MANAGEMENT PLAN INTEGRATED NOXIOUS WEED MANAGEMENT PLAN FOR CHAVERS MINING RESOURCE 12367 COUNTY ROAD 8 FORT LUPTON, WELD COUNTY, COLORADO DRMS PERMIT NO. M-2015-030 Prepared by: ASPHALT SPECIALTIES CO., INC 10100 DALLAS STREET HENDERSON, COLORADO 80640 303-289-8555 • Fax 303-289-7707 ASPHALT SPECIALTIES CO. January 2024 Chavers Mining Resource Integrated Noxious Weed Management Plan January 2024 Page ii TABLE OF CONTENTS Section Page 1.0 INTRODUCTION 1 1.1 PROPERTY INFORMATION 1 1.2 WEED MANAGEMENT PRIORITIES AND GOALS 2 1.3 LOCAL AGENCY EVALUATION AND CONSULTATION 2 2.0 OVERVIEW OF TARGETED WEED SPECIES 3 2.1 SITE -SPECIFIC TARGETED WEED SPECIES 3 3.0 MANAGEMENT OPTIONS FOR TARGETED WEED SPECIES 5 3.1 CONTROL METHODS 5 3.2 LIST B WEED SPECIES - CONTROL METHODS REQUIRED 6 3.2.1 Scotch Thistle 6 3.2.2 Hoary Cress 6 3.3 LIST C WEED SPECIES - CONTROL METHODS NOT REQUIRED 7 3.3.1 Cheatgrass 7 3.3.2 Field Bindweed 7 4.0 SITE -SPECIFIC INTEGRATED WEED MANGEMENT PLAN 8 5.0 BASIC WEED MANAGEMENT GUIDELINES 8 5.1 BASIC CULTURAL CONTROL GUIDELINES 9 5.2 BASIC MECHANICAL CONTROL GUIDELEINES 9 5.3 BASIC CHEMICAL CONTROL GUIDELINES 9 5.3.1 SPRAY DRIFT MANAGEMENT 10 5.4 BASIC BIOLOGICAL CONTROL GUIDELINES 12 LIST OF FIGURES FIGURE 1 INTEGRATED NOXIOUS WEED MANAGEMENT PLAN MAP LIST OF APPENDICES APPENDIX A TARGETED WEED SPECIES - FACT SHEETS APPENDIX B GENERAL HERBICIDE CHEMICAL SELECTION SHEETS Chavers Mining Resource Integrated Noxious Weed Management Plan January 2024 Page 1 1.0 INTRODUCTION This Integrated Noxious Weed Management Plan has been developed to control noxious weed species within the Division of Reclamation, Mining, and Safety (DRMS) permit boundary for the Chavers Mining Resource (Site — Figure 1). This plan identifies existing noxious weeds on the property that are comingled with other native plant species that are present (e.g., western wheatgrass). This plan contains noxious weed management practices, typically recommended by Colorado State University and other weed organization professionals. Weed management practices have been tailored to the specific weed problems identified at the Site. The weed management approach to gain control of the invasive species at the Site presented in this plan is based on the following concepts. 1) Weed control must be applied and evaluated over an extended period to be successful. 2) The basic steps of weed control include identification of weed species, locating the weed problem, development of control and prevention strategies, implementation of those strategies, and ongoing monitoring to assess the effectiveness of the efforts. 3) To prevent/minimize the infestation and spread of noxious weeds, semi-annual inspections of the permitted area will be conducted in the spring and fall of each year to evaluate site conditions at the time and monitor response to previous treatments. Appropriate weed control actions shall be implemented whenever noxious weed species are observed on the property. This plan identifies specific treatment methods and timetables. Plans may be modified based in new invasions of weed based on the species of concern, location and extent of the infestation, and other pertinent factors. Development of this plan is in accordance with Section 3.1.10 (6) of the Mineral Rule and Regulations of the Colorado Mined Land Reclamation Board for the Extraction of Construction Materials. 1.1 PROPERTY INFORMATION Property Owner Hunt Brothers Properties Mine Operator Asphalt Specialties Co., Inc. (ASCI) DRMS Permit No. M-2015-030 Site Address 12367 County Road 8, Fort Lupton, Weld County, Colorado Latitude / Longitude 40.048389° / -104.822318° Elevation — 4,920 feet above mean sea level (ft amsl) Permitted Acreage — 95 acres Acreage Disturbed — 87 acres Soil Types (—% of Property) Aquolls and Aquents, gravelly substratum (-73%); Ellicott -Ellicott sandy -skeletal complex, 0 to 3 percent slopes, rarely flooded (.22%); and Ustic Torriorthents, moderately steep (-5%). Chavers Mining Resource Integrated Noxious Weed Management Plan January 2024 Page 2 1.2 WEED MANAGEMENT PRIORITIES AND GOALS The priorities of this weed management plan are to: 1) contain current noxious weed infestations; 2) suppress and/or eliminate noxious weed species present; and 3) prevent potential invasive weed species in Weld County from infesting the Site. General descriptions of these basic weed management goals for the Site are below: Elimination/Eradication: Elimination (or eradication) is the complete removal of a weed infestation. It is the implementation of a short-term but intensive control effort to completely purge a targeted weed infestation permanently from an area (unless reintroduced). Elimination is desirable and possible for small weed patches, but not always for larger ones. (Important note: if eradication creates an open environment, a weed problem may be cured simply to create another one; therefore, it is essential to revegetate the ground to prevent another infestation). Containment: Containment prevents weed encroachment onto non -infested areas. It is the creation and enforcement of confining perimeters around the infestation. This is achieved by eradicating plants on the exterior of the infestation's designated perimeter and those along vector corridors (such as roads, streams, trails) that may help spread the infestation beyond the perimeter. Suppression: Suppression reduces weed density and area. It is the use of a wide variety of weed management techniques that reduce the density and severity of infestations within the boundaries of containment perimeters. This is done to mitigate the harm to agriculture, the environment, and other values caused by widespread and well -established populations of noxious weeds. 1.3 LOCAL AGENCY EVALUATION AND CONSULTATION ASCI contacted the Weld County Public Works Department - Weed Management Division for assistance in preparing this weed management plan. A site visit to identify the types, locations, and extents of noxious weeds present at the Site was conducted with Weed Management Division Supervisor, Ms. Tina Booton, on December 4, 2023. Information regarding the identification and management strategy for noxious weeds obtained from the Weed Management Division is present throughout this plan. Below is contact information for the Weed Management Division. Weld County Public Works Department Weed Management Division 1111 H Street Greeley, CO 80631 Phone: (970) 400-3770 E-mail: tbooton@weldgov.com Website: https://www.weldgov.com/departmentsipublic_works/weed management Chavers Mining Resource Integrated Noxious Weed Management Plan January 2024 Page 3 2.0 OVERVIEW OF TARGETED WEED SPECIES Noxious weeds in Colorado are categorized based on the extent of infestation within the state. Colorado Noxious Weeds - List A: List A species are not well established in Colorado, are potentially a large problem to this state, and require mandatory eradication by local governing agencies. Prescribed techniques for management of List A species are hand pulling, digging, or herbicide application. Mowing, grazing, and insect bio-control are not acceptable forms of management for these species. Colorado Noxious Weeds - List B: List B species are common enough in parts of the state that eradication is not feasible, though the species are still recommended for eradication, suppression, or containment depending on distribution and densities around the state. Prevention of seed dispersal may be accomplished by mowing, hand pulling, tillage, grazing, or herbicide application. Colorado Noxious Weeds - List C: List C species are widespread and well established. Control of List B and C species is recommended, but not required by the state. However, local governing bodies may require management. No List A weeds have been identified at the Site. Section 2.1 identifies the primary List B and C weed species of concern and provides general descriptions and information about the weeds. 2.1 SITE -SPECIFIC TARGETED WEED SPECIES The following table lists the most prevalent noxious weeds species of concern identified at the Site. These are the primary targets for management, management strategy (i.e., priority and goal), and extent of infestation (Figure 1). Copies of the Targeted Weed Fact Sheets are provided in Appendix A. Noxious Weed Species Identified (Scientific Name) State/County List Management Priority Designation Goal Infestation Density Scotch Thistle (Onopordum acanthium) B 1st Containment & Suppression Medium Hoary Cress (Cardaria draba) B 1st Containment & Suppression Medium Cheatgrass (Bromus tectorum) C 2nd Suppression Light Field Bindweed (Convolvulus arvensis) C 2nd Suppression Light Chavers Mining Resource Integrated Noxious Weed Management Plan January 2024 Page 4 Scotch Thistle (Onopordum acanthium): Scotch thistle (Onopordum acanthium) is a non-native biennial forb that reproduces solely by seed. A biennial is a plant that completes its lifecycle within two years. During the first year of growth, Scotch thistle appears as a rosette in spring or fall. During the second year in mid to late spring — the stem bolts, flowers, sets seed, and the plant dies. A prolific seed producer, Scotch thistle can produce up to 14,000 seeds per plant. Scotch thistle can grow up to 12 feet tall. Stems are numerous, branched, and have broad, spiny wings. The leaves are large, green, spiny, and covered with fine dense hair giving the leaf a woolly appearance. The flowers are violet to reddish in color, numerous (70-100/plant), and are surrounded by spine -tipped bracts. You can expect to see flowers from mid -June to September. Due to the robust, spiny nature of Scotch thistle, this plant can act as a living barbed wire fence, making areas impassible for wildlife, livestock, and people. Scotch thistle invades rangeland, overgrazed pastures, roadsides, and irrigation ditches. It also prefers moist areas adjacent to creeks and rivers. Hoary Cress (Cardaria draba): Hoary Cress (Cardaria draba) is a non-native perennial that spreads by seeds and aggressive, creeping, roots that vigorously produce new plants. Depending on conditions, hoary cress grows to a height of to 2 feet tall. The first leaves emerge from a crown and are dull gray -green, oblong and often have a slightly wavy margin. Subsequent leaves are alternate, have short fine hairs and an irregularly toothed margin. Only the lower leaves have stems, others are stalk -less and clasp the plant stem with two ear -like lobes. Flowers are fragrant, numerous, small, white with 4 petals and grow in compact clusters. Hoary cress is a member of the Mustard family. In the fall seeds germinate and rosettes become established. It frequently flowers in April and May and again in the fall during optimum conditions. Seed production begins about one month later. Hoary cress produces up to 4800 seeds per plant. Seed viability is up to 3 years. However, the primary means of spread is the vertical and horizontal root system. Root fragments are capable of forming new plants. In one year, a single plant, without competition, can spread vegetatively to cover an area 12 feet in diameter and can produce 450 shoots. Hoary cress can be found in disturbed open sites, roadsides, ditches, riparian areas, grain and vegetable fields. It does especially well in irrigated crops such as alfalfa and sugar beets. Hoary cress grows well in most soil conditions, including alkaline soils. However, it does not tolerate shade. CheatSrass (Bromus tectorum): Commonly referred to as cheatgrass, (Bromus tectorum) it is also known as downy brome, downy cheat and bronco grass. It is widely distributed throughout the United States and has been reported to be the dominant species on more than 100 million acres of the intermountain west. Cheatgrass is unique in that it occupies a dual role as a serious weed and important early season forage. Cheatgrass can maintain dominance for many years on sites where native vegetation has been eliminated or severely reduced by grazing, cultivation or fire. Cheatgrass is a winter annual member Chavers Mining Resource Integrated Noxious Weed Management Plan January 2024 Page 5 of the grass (Poaceae) family. It reproduces by seed which germinates in the fall, over winters as a seedling and flowers in the spring. Seed can remain viable in the soil for 2 to 5 years. Cheatgrass can grow in almost any soil type and readily adapts to varying precipitation. Cheatgrass can be several inches to more than 18 inches tall. It has a nodding seed head with many finely hairy drooping spikelets. As it matures the seed heads and foliage often become reddish and then progress to a light tan. Field Bindweed (Convolvulus arvensis): Field bindweed (Convolvulus arvensis) is a non-native deep-rooted perennial that reproduces from seed and creeping, horizontal roots (rhizomes). Field bindweed stems prostrate (grows low to the ground) and twine and grow up to 6 feet long. Leaves are distinguishable by their arrowhead shape. The flowers are bell or trumpet -shaped, white to pink in color, and are about 1 inch long. Field bindweed seeds can remain viable in the soil for up to 40 years. Field bindweed emerges from its root system in the spring. Flowering occurs from June to September and until the first fall frost. The number of seeds produced per plant ranges from 25 to 300 and seed production is variable depending on environmental conditions. Field bindweed is an extremely difficult noxious weed to control because, in part, of its root that may go 20 feet deep into the soil, and which repeatedly gives rise to numerous long rhizomes. 3.0 MANAGEMENT OPTIONS FOR TARGETED WEED SPECIES Management of weed species can vary from species to species. The following sections provide a summary of effective control methods and timing for implementation to treat each targeted noxious weed species present at the Site. 3.1 CONTROL METHODS Integrated management is a program of noxious weed control that properly implements a variety of coordinated control methods which greatly improves the success rate for weed control. There are no cure-alls for noxious weeds — no single tool will work every time in every situation. The solution is integrated management, which combines, or integrates, different tools to provide more effective weed control than any single tool could produce. The stress and damage caused by one tool weakens the target, making it more susceptible to damage caused by other tools. Types of control methods include: • Cultural — Introducing and promoting competitive species (i.e., competitive grasses, planted cottonwood cuttings, etc.) have proven to be effective at reducing the chances of re -invasion. Information is available from the local Colorado State University (CSU) Extension office or Natural Resources Conservation Service office for proper seed mix recommendations. • Mechanical — Mechanical controls include mowing, cutting, pulling, clipping, fire, grazing, tillage, grubbing. Chavers Mining Resource Integrated Noxious Weed Management Plan January 2024 Page 6 Chemical/Herbicides — A variety of herbicide options exist that will control noxious weeds. The active ingredient will vary based on the specific noxious weed species. Information about herbicides can be found on the Crop Data Management Systems, Inc. website (www.cdms.net) and specific specimen labels are available for viewing online. Whichever herbicide you choose to use, remember to read the herbicide label before using the product and follow all directions and precautions. Always read, understand, and follow label directions. The herbicide label is the LAW! Landowners should provide consent for use of chemicals/herbicides prior to application. All contracted professional herbicide applicators must be fully licensed by the Colorado Department of Agriculture. Biological — Not all sites are suitable for biological control. The use of insects will also require some maintenance and considerations for their lifecycle and behavior. Insects can be obtained at no charge from the Colorado Department of Agriculture - Palisade Insectary. Please call (970) 464-7916, e-mail: insectary(ajstate.co.us, or go to www.palisadeinsectray.com for more information. 3.2 LIST B WEED SPECIES - CONTROL METHODS REQUIRED 3.2.1 Scotch Thistle Cultural — Establishment of selected, aggressive grasses can be an effective cultural control of Scotch thistle. Contact your local CSU Extension office or Natural Resources Conservation Service office for seed mix recommendations. Good grazing management will stimulate grass growth and keep pastures healthy. Healthy pastures may be more resistant to Scotch thistle invasion. Bare spots caused by overgrazing are prime habitat for weed infestations. Mechanical — Any mechanical or physical method that severs the root below the soil surface will kill Scotch thistle. Mowing or chopping is most effective when Scotch thistle plants are at full bloom. Be sure to properly dispose of the flowering cut plants since seeds can mature and become viable after the plant has been cut down. Chemical/Herbicides — Herbicides that can be applied to range and pasturelands for Scotch thistle are provided on the fact sheet presented in Appendix A. Biological — There are no biological control insects available that will control Scotch thistle. 3.2.2 Hoary Cress Cultural — Establishment of selected, aggressive grasses can be an effective cultural control of hoary cress. Contact your local CSU Extension office or Natural Resources Conservation Service office for seed mix recommendations. Good grazing management will stimulate grass growth and keep pastures healthy. Healthy pastures may be more resistant to hoary cress invasion. Bare spots caused by overgrazing are prime habitat for weed infestations. Chavers Mining Resource Integrated Noxious Weed Management Plan January 2024 Page 7 Mechanical — Due to the extensive root system, hand -pulling this plant is not a viable option. Repeated tillage (every 10 to 14 days) can destroy colonies in 2 to 4 years. Combining mowing with herbicides will further enhance control of this weed. Apply herbicides in spring and/or fall, and then mow during the summer months. Mowing alone is not an effective control option. Chemical/Herbicides — Herbicides that can be applied to range and pasturelands for Hoary Cress are provided on the fact sheet presented in Appendix A. Biological — No known biological control agents available at this time. 3.3 LIST C WEED SPECIES - CONTROL METHODS NOT REQUIRED 3.3.1 Cheatgrass Cultural — Establishment of selected, aggressive grasses can be an effective cultural control of cheatgrass. Contact your local CSU Extension office or Natural Resources Conservation Service office for seed mix recommendations. Good grazing management will stimulate grass growth and keep pastures healthy. Healthy pastures may be more resistant to cheatgrass invasion bare spots caused by overgrazing are prime habitat for weed infestations. Mechanical — Fire, mowing, grazing, tillage, and inter -seeding competitive species have all shown promise in reducing cheatgrass populations. Long lasting control requires a combination of chemical, physical, vegetative suppression and proper livestock management. Chemical/Herbicides — Herbicides that can be applied to range and pasturelands for Cheatgrass are provided on the fact sheet presented in Appendix A. Biological — Biological control is limited. Rabbits and mice will feed extensively on the seedlings as will migratory grasshoppers. But there is no long-term biocontrol agent available. 3.3.2 Field Bindweed Cultural — Establishment of selected, aggressive grasses can be an effective cultural control of field bindweed. Contact your local CSU Extension office or Natural Resources Conservation Service office for seed mix recommendations. Good grazing management will stimulate grass growth and keep pastures healthy. Healthy pastures may be more resistant to field bindweed invasion. Bare spots caused by overgrazing are prime habitat for weed infestations. Mechanical — Cutting, mowing, or pulling has a negligible effect unless the plants are cut below the surface in the early seedling stage. Well -established populations have a large seed bank in the soil that can remain viable for over 40 years. Chemical/Herbicides — Herbicides that can be applied to range and pasturelands for Cheatgrass are provided on the fact sheet presented in Appendix A. Biological — The bindweed gall mite, Aceria mahlerbae, has proven to be effective in reducing field bindweed infestations. Biocontrol agents can be obtained at no charge from the Colorado Department of Agriculture's Insectary (Phone: 970-464-7916 or www.palisadeinsectary.com). Chavers Mining Resource Integrated Noxious Weed Management Plan January 2024 Page 8 4.0 SITE -SPECIFIC INTEGRATED WEED MANGEMENT PLAN Overall weed management at the Site will be monitored during semi-annual inspections (prior to and after seeding) to evaluate the effectiveness of previous activities conducted and for the strategies being implemented. Changes to control methods and/or implementation schedule will be made, as necessary. Due to the current extent of the pit, access to all the areas of concern for equipment is limited. If weeds are determined to be spreading beyond current containment, ASCI will implement mechanical controls (e.g., mowing) to manage priority targeted weed species present when backfill of the Site allows for safe passage of equipment to access areas of concern identified. This will prevent seed production/spreading of weeds and allow for further cultural establishment of the native plant species and competitive grasses already present at the Site. Mowing will be conducted two (2) times per year during the operational life of the mine once feasible to implement. The first mowing will occur in the spring to early summer as the plants bolt, but before the plants flower (roughly April through early June). The second mowing will occur in the fall as the plants prepare for winter dormancy (late September or early October). Due to the adjacent South Platte River on the western boundary, the application of spray herbicides poses a significant risk to these sensitive receptors (Figure 1). Factors outside the control of a licensed commercial spraying applicator (e.g., sustained wind speeds or gusts greater than 10 miles per hour [mph] during application causing drift, herbicide runoff, etc.) could result in the contamination of waters and/or other private property. To avoid possible adverse impacts from herbicides, ASCI will begin to implement chemical/herbicide controls the season prior to reclamation seeding. Chemical/herbicide controls implemented will consist of full application and/or spot treatment of weeds, as appropriate. The actual chemical(s)/herbicide(s) used will be selected by the licensed commercial spraying applicator; however, herbicides that can be applied to range and pasturelands are provided on the fact sheets presented in Appendix A and general chemical/herbicide selection sheets are presented in Appendix B. Per Weld County Public Works Department - Weed Management Division recommendation, a Piper E -Z combination (Liquid: 20 oz./acre; Granular: 10 oz./acre) is recommended for soft bare ground and to keep existing grasses. 5.0 BASIC WEED MANAGEMENT GUIDELINES Noxious weed management is not a one-time effort. To obtain your desired level of management, you will need to perform control measures for several years. Work will include observation, control application, observation of controls effectiveness and eradication of the weed population. Work at small infestations and the perimeters of larger infestations first. This will help keep infestations from spreading outward and will help to control new outbreaks. By confining the weeds into areas, they will be more manageable. Keep records of the controls you use and the results. This will provide analysis of the weed control progress and make any needed modifications to the specific weed control program. Chavers Mining Resource Integrated Noxious Weed Management Plan January 2024 Page 9 5.1 BASIC CULTURAL CONTROL GUIDELINES The most effective method of control for noxious weeds is to prevent their establishment through proper land management. Maintain healthy pastures and rangeland and continually monitor your property for new infestations. New infestations are much more easily controlled than established infestations. Disturbed soil and bare ground are prime habitats for weed invasions. A healthy native plant community will help keep noxious weeds under control by providing competition. Grass seeding takes place in the fall with follow up over seeding the spring as required to establish a healthy stand of vegetation. You can either broadcast seed or use a seed drill to plant it (depending on the area). Riparian areas may require other revegetation efforts. 5.2 BASIC MECHANICAL CONTROL GUIDELEINES Clean the mowing equipment to remove seeds and vegetative plant parts with a pressure washer before and after mowing operations. This is especially important if mowing flowering plants. To limit spreading of weeds, do not clean equipment in un-infested areas, near roadways, or streams. Some flowering plants and their cut-off flower heads can still develop viable seeds. If the plants have already bloomed when you cut or pull them, it is important to properly dispose of them. Put them in a garbage bag, make sure bags are securely closed, and send them to a landfill. Generally, it is okay to mow one week after spraying. Mowing should not be done immediately following applications to allow the sprayed plants time to absorb the herbicide into their systems 5.3 BASIC CHEMICAL CONTROL GUIDELINES The first rule of herbicide use is to read the label before using the product and follow all directions and precautions. The label is the law. Seek assistance before purchasing or using an herbicide if not sure of the use or purpose of the product. Chemicals are powerful tools that should be used judiciously. Follow all instructions (application rates, proper safety equipment, appropriate weather conditions, etc.) as directed on the herbicide's label. Safety precaution may safety glasses, rubber gloves, long-sleeved shirts, long pants, high -top shoes, and socks are common sense precautions which all applicators should take. An additional precaution includes the use a respirator to protect sensitive mucus membranes in nose and throat. Follow proper clean-up and disposal procedures for the equipment and containers. All directions for use are dictated on the herbicide's label. Care must be taken to avoid spraying herbicides near water unless they are specifically labeled for aquatic use. An aquatic -approved herbicide is required when applications will be made over water or encounter surface water. An aquatic -safe herbicide is a great quality to have in an herbicide when applying near any kind of stream or river (riparian areas) or drainages. Chavers Mining Resource Integrated Noxious Weed Management Plan January 2024 Page 10 Broadleaf selective herbicides (such as 2,4-D) can either be applied by spot spraying individual plants or by a continuous spray over an entire area. A non -selective herbicide (such as glyphosate) should only be used if spot spraying. Avoid using soil -active herbicides (such as dicamba) near windbreak plants or other desirable woody vegetation. Plant injury or death can occur. Also, do not allow any herbicide to drift onto desirable vegetation for the same reasons. From time to time, if possible, alternate the herbicide (active ingredient) applied to the noxious weed infestation. This will help to prevent the weeds from developing chemical resistance. For the first few years, spray twice per year: once in the spring and once in the fall. When you have achieved a more acceptable level of control, you can change to spraying only once in the fall. If it becomes economically unfeasible for you to spray twice a year, you may choose to only spray in the fall. From time to time, if possible, alternate the herbicide (active ingredient) you use. This will help to prevent the weeds from developing chemical resistance. When using a foliar spray, be sure to get good spray coverage of the plants. All the leaves should have herbicide contact. The sprayed plants should be obviously wet, but not dripping with herbicide. If a surfactant is indicated the herbicide label, it should be mixed as directed with the herbicide. Surfactants help herbicides do their job by reducing the surface tension of liquids between two liquids or a solid leaf. You may also choose to use an herbicide tracer dye so that you can easily see the areas you have treated. Calibrate the sprayer to the recommended application rate and keep records of the work performed. 5.3.1 SPRAY DRIFT MANAGEMENT Avoiding spray drift at the application site is the responsibility of the applicator. The interaction of many equipment and weather -related factors determine the potential for spray drift. The applicator and grower are responsible for considering all these factors when making decisions. The following drift management requirements must be followed to avoid off -target drift movement from aerial applications to agricultural field crops. These requirements do not apply to forestry applications, public health uses, or to applications using dry formulations. 1. The distance of the outermost nozzles on the boom must not exceed 3/4 the length of the wingspan or rotor. 2. Nozzles must always point backwards parallel with the airstream and never be pointed downwards more than 45 degrees. AERIAL DRIFT REDUCTION INFORMATION INFORMATION ON DROPLET SIZE The most effective way to reduce drift potential is to apply large droplets. The best drift management strategy is to apply the largest droplets that provide sufficient coverage and control. Applying larger droplets reduces drift potential but will not prevent drift if applications are made Chavers Mining Resource Integrated Noxious Weed Management Plan January 2024 Page 11 improperly, or under unfavorable environmental conditions (see "Wind", "Temperature and Humidity", and "Temperature Inversions"). CONTROLLING DROPLET SIZE Volume — Use high flow rate nozzles to apply the highest practical spray volume. Nozzles with higher rated flows produce larger droplets. Pressure — Do not exceed the nozzle manufacturer's recommended pressures. For many nozzle types lower pressure produces larger droplets. When higher flow rates are needed, use higher flow rate nozzles instead of increasing pressure. Number of Nozzles — Use the minimum number of nozzles that provide uniform coverage. Nozzle Orientation — Orienting nozzles so that the spray is released parallel to the airstream produces larger droplets than other orientations and is the recommended practice. Significant deflection from horizontal will reduce droplet size and increase drift potential. Nozzle Type — Use a nozzle type that is designed for the intended application. With most nozzle types, narrower spray angles produce larger droplets. Consider using low -drift nozzles. Solid stream nozzles oriented straight back produce the largest droplets and the lowest drift. Boom Length — For some use patterns, reducing the effective boom length to less than 3/4 of the wingspan or rotor length may further reduce drift without reducing swath width. Application Height — Applications should not be made at a height greater than 10 feet above the top of the largest plants unless a greater height is required for aircraft safety. Making applications at the lowest height that is safe reduces exposure of droplets to evaporation and wind. SWATH ADJUSTMENT When applications are made with a crosswind, the swath will be displaced downwind. Therefore, on the up and downwind edges of the field, the applicator must compensate for this displacement by adjusting the path of the aircraft upwind. Swath adjustment distance should increase with increasing drift potential (higher wind, smaller drops, etc.). WIND Drift potential is lowest between wind speeds of 2 —10 mph. However, many factors, including droplet size and equipment type determine drift potential at any given speed. Application should be avoided below 2 mph due to variable wind direction and high inversion potential. Do not apply by air when wind speed is greater than 8 mph. Do not apply by ground when wind speed is greater than 10 mph. Chews, Mining Resource Integrated Noxious Weed Management Plan January 2024 Page 12 Note: Local terrain can influence wind patterns. Every applicator should be familiar with local wind patterns and how they affect spray drift. TEMPERATURE AND HUMIDITY When making applications in low relative humidity, set up equipment to produce larger droplets to compensate for evaporation. Droplet evaporation is most severe when conditions are both hot and dry. Do not apply when air temperatures exceed 90°F. TEMPERATURE INVERSIONS Do not make applications during a temperature inversion because drift potential is high. Temperature inversions restrict vertical air mixing, which causes small suspended droplets to remain in a concentrated cloud. This cloud can move in unpredictable directions due to the light variable winds common during inversions. Temperature inversions are characterized by increasing temperatures with altitude and are common on nights with limited cloud cover and light to no wind. They begin to form as the sun sets and often continue into the morning. Their presence can be indicated by ground fog; however, if fog is not present, inversions can also be identified by the movement of smoke from a ground source or an aircraft smoke generator. Smoke that layers and moves laterally in a concentrated cloud (under low wind conditions) indicates an inversion, while smoke that moves upward and rapidly dissipates indicates good vertical air mixing. SENSITIVE AREAS The pesticide may only be applied when the potential for drift to adjacent sensitive areas (e.g., residential areas, bodies of water, known habitat for threatened or endangered species, non -target crops) is minimal (e.g., when wind is blowing away from the sensitive areas). CLEANING SPRAY EQUIPMENT All mixing equipment and air spray equipment should be thoroughly cleaned before and after mixing and applying. Do not contaminate water by cleaning of equipment or disposal of rinsate. 5.4 BASIC BIOLOGICAL CONTROL GUIDELINES Biological controls are a good option for larger infestations. Expect to wait a few years for the insects to establish and achieve optimum results. Once established, biological controls tend to persist and provide control for many years. Not all sites are suitable for biological control. Biocontrol agents are affected by the environment and climatic/cultural conditions may inhibit their efficacy. The use of these insects will also require some maintenance and considerations for their lifecycle and behavior. For more information, contact the Palisade Insectary of the Colorado Department of Agriculture. FIGURES = Permit Boundary = Primary Areas of Concern Scale: 0 220 440 Feet I 1 I 1 I INTEGRATED NOXIOUS WEED MANAGEMENT PLAN CHAVERS MINING RESOURCE 12367 COUNTY ROAD 8 FORT LUPTON, WELD COUNTY, COLORADO DATE: 1/14/2024 APPENDIX A TARGETED WEED SPECIES - FACT SHEETS Rangeland -Pasture Recommendations Scotch thistle Identification and Management Scotch thistle (Onopordurn acanthiuin) is a non-native biennial forb that reproduces solely by seed. A biennial is a plant that completes its lifecycle within two years. During the first year of growth, Scotch thistle appears as a rosette in spring or fall. During the second year in mid to late spring - the stem bolts, flowers, sets seed, and the plant dies. A prolific seed producer, Scotch thistle can produce up to 14,000 seeds per plant. Therefore, the key to managing this plant is to prevent seed production. Scotch thistle can grow up to 12 feet tall. Stems are numerous, branched, and have broad, spiny wings. The leaves are large, green, spiny, and covered with fine dense hair giving the leaf a woolly appearance. The flowers are violet to reddish in color, numerous (70-100/plant), and are surrounded by spine - tipped bracts. You can expect to see flowers from mid -June to September. Due to the robust, spiny nature of Scotch thistle, this plant can act as a living barbed wire fence, making areas impassible for wildlife, livestock, and people. Scotch thistle invades rangeland, overgrazed pastures, roadsides, and irrigation ditches. It also prefers moist areas adjacent to creeks and rivers. On the backside of this sheet are Scotch thistle management recommendations. If you have any questions, please contact the Weld County Public Works Dept., Weed Division at (970) 304-6496 ext. 3770. Please visit our website www.weldweeds.org. Recommended management methods: Cultural - Establishment of selected, aggressive grasses can be an effective cultural control of Scotch thistle. Contact your local CSU Extension office or Natural Resources Conservation Service office for seed mix recommendations. Good grazing management will stimulate grass growth and keep pastures healthy. Healthy pastures may be more resistant to Scotch thistle invasion. Bare spots caused by overgrazing are prime habitat for weed infestations. Mechanical - Any mechanical or physical method that severs the root below the soil surface will kill Scotch thistle. Mowing or chopping is most effective when Scotch thistle plants are at full -bloom. Be sure to properly dispose of the flowering cut plants, since seeds can mature and become viable after the plant has been cut down. Biological - There are no biological control insects available that will control Scotch thistle. Herbicides - The following are recommendations for herbicides that can be applied to range and pasturelands. Always read, understand, and follow label directions. The herbicide label is the LAW! Herbicide Rate Application Timing/Comments 2,4-D Amine 1 or 1 qt./acre oz/gal water Spring/fall apply Add 1 qt/100 when non-ionic gal rosette outside water. surfactant — temperatures before flowering @ will 0.32 oz/gal stalk exceed lengthens. water 85 or degrees. DO NOT Curtail 1.5 1.5-2.0 — 2 qts./acre or oz/gal water treatment Spring Add 1 Spring shrubs Add water. qt/100 rosette rosette or non-ionic gal to water. surfactant pre -bud stage and/or @ 0.32 oz/gal fall rosette. water or non-ionic a Clarity 1 1.0 qt./acre or oz/gal water of when — before rosettes. outside surfactant DO flowering temperatures NOT apply @ 0.32oz/gal stalk near will lengthens or exceed water under or and/or 85 1 trees qt/100 degrees. late and/or gal fall Milestone 3 to 5 oz/ acre Apply bolting seasonally and year water lowland of to stage application. or plants 1 dry qt/ sites. 100 or in wetlands to gal the the DO Add water. spring fall NOT and a rosette. non-ionic transitional rotate and early It is to a surfactant summer permissible broadleaf areas between at @ crop 0.32oz/gal rosette to treat within upland or 1 Rangeland -Pasture Recommendations Hoary Cress Identification and Management Hoary Cress (Cardaria draba) is a non-native perennial that spreads by seeds and aggressive, creeping, roots that vigorously produce new plants. Depending on conditions, hoary cress grows to a height of 1/2 to 2 feet tall. The first leaves emerge from a crown and are dull gray -green, oblong and often have a slightly wavy margin. Subsequent leaves are alternate, have short fine hairs and an irregularly toothed margin. Only the lower leaves have stems, others are stalk -less and clasp the plant stem with two ear -like lobes. Flowers are fragrant, numerous, small, white with 4 petals and grow in compact clusters. Hoary cress is a member of the Mustard family. In the fall seeds germinate and rosettes become established. It frequently flowers in April and May and again in the fall during optimum conditions. Seed production begins about one month later. Hoary cress produces up to 4800 seeds per plant. Seed viability is up to 3 years. However, the primary means of spread is the vertical and horizontal root system. Root fragments are capable of forming new plants. In one year, a single plant, without competition, can spread vegetatively to cover an area 12 feet in diameter and can produce 450 shoots. Hoary cress is also known as whitetop Rosette Hoary cress can be found in disturbed open sites, roadsides, ditches, riparian areas, grain and vegetable fields. It does especially well in irrigated crops such as alfalfa and sugar beets. Hoary cress grows well in most soil conditions, including alkaline soils. However, it does not tolerate shade. Hoary cress displaces native vegetation for wildlife and livestock forage. It also contains glucosinolates that are toxic to cattle. Prevention is the most cost reducing and time effective weed management strategy. Infrequent cultivation can actually facilitate the spread by dispersing root fragments. Consistent monitoring of your fields is an essential first step. On the backside of this sheet are hoary cress management recommendations. If you have any questions, please contact the Weld County Public Works Dept., Weed Division at (970) 400-3770. Please visit our website at www.weldweeds.org Recommended management methods: Cultural - Establishment of selected, aggressive grasses can be an effective cultural control of hoary cress. Contact your local CSU Extension office or Natural Resources Conservation Service office for seed mix recommendations. Good grazing management will stimulate grass growth and keep pastures healthy. Healthy pastures may be more resistant to hoary cress invasion. Bare spots caused by overgrazing are prime habitat for weed infestations. Mechanical - Due to the extensive root system, hand -pulling this plant is not a viable option. Repeated tillage (every 10 to 14 days) can destroy colonies in 2 to 4 years. Combining mowing with herbicides will further enhance control of this weed. Apply herbicides in spring and/or fall, and then mow during the summer months. Mowing alone is not an effective control option. Biological No known biological control agents available at this time. Herbicides - The following are recommendations for herbicides that can be applied to range and pasturelands. Always read, understand, and follow label directions. The herbicide label is the LAW! Herbicide Escort XP Telar XP Plateau Rate ito 2 oz/acre or 1.3 grams to 3 gallons of water 0.5 to 1 oz/acre or a/ of a gram to 3 gallons water 8 oz./acre or 0.25 oz/gal water Application Timing/Comments Apply from bud to early bloom stage or at fall rosette. Add a non -acidifying non-ionic or MSO surfactant @ 0.32oz/gal water or 1 qt/ 100 gal water. Apply at prebloom to bloom or at fall rosette stage. Add a non - acidifying non-ionic or MSO surfactant (Iv, 0.32oz/gal water or 1 qt/ 100 gal water. Spring apply to rosette stage or at flowering or at fall rosette. Add a methylated seed oil surfactant (MSO) @ 0.32 oz/gal water or 1 qt/ 100 gal water. Rangeland -Pasture Recommendations Cheatgrass Identification and Management Commonly referred to as cheatgrass, (Bromus tectorum) it is also known as downy brome, downy cheat and bronco grass. It is widely distributed throughout the United States and has been reported to be the dominant species on more than 100 million acres of the intermountain west. Cheatgrass is unique in that it occupies a dual role as a serious weed and important early season forage. In terms of volume of forage produced and extent of area covered it is the single most important spring forage. Cheatgrass can maintain dominance for many years on sites where native vegetation has been eliminated or severely reduced by grazing, cultivation or fire. Cheatgrass is a winter annual member of the grass (Poaceae) family. It reproduces by seed which germinates in the fall, over winters as a seedling and flowers in the spring. Seed can remain viable in the soil for 2 to 5 years. Cheatgrass can grow in almost any soil type and readily adapts to varying precipitation. Cheatgrass can be several inches to more than 18 inches tall. It has a nodding seed head with many finely hairy drooping spikelets. As it matures the seed heads and foliage often become reddish and then progress to a light tan. The mature seeds readily penetrate clothing and are frequently a problem in dog's ears and noses. Cheatgrass is found in both disturbed and undisturbed sites. The largest infestations are usually found in overgrazed range and pasture, abandoned fields, eroded sites and waste areas. The greatest competitive advantage following a fire goes to cheatgrass because the native shrubs and perennial grasses cannot recover as quickly allowing cheatgrass to establish a monoculture. On the backside of this sheet are cheatgrass management recommendations. If you have any questions, please contact the Weld County Public Works Dept., Weed Division at (970) 304-6496 ext. 3770. Please visit our website at www.weldweeds.org Recommended management methods: Cultural - Establishment of selected, aggressive grasses can be an effective cultural control of cheatgrass. Contact your local CSU Extension office or Natural Resources Conservation Service office for seed mix recommendations. Good grazing management will stimulate grass growth and keep pastures healthy. Healthy pastures may be more resistant to cheatgrass invasion bare spots caused by overgrazing are prime habitat for weed infestations. Mechanical - Fire, mowing, grazing, tillage, and inter -seeding competitive species have all shown promise in reducing cheatgrass populations. Long lasting control requires a combination of chemical, physical, vegetative suppression and proper livestock management. Biological -Biological control is limited. Rabbits and mice will feed extensively on the seedlings as will migratory grasshoppers. But there is no long-term biocontrol agent available. Herbicides - The following are recommendations for herbicides that can be applied to range and pasturelands. Always read, understand, and follow label directions. The herbicide label is the LAW! Herbicide Rate Application Timing/Comments Plateau 4 to 6 oz/acre Fall application as a pre -emergent prior to a hard freeze is optimum for control. Use a methylated seed oil surfactant (MSO) at 0.32 oz/gal water or 1 qt/100 gal water. The 12 oz rate of Plateau may cause injury to some cool season grasses. Panoramic 2 SL 4 — 8 Oz/Acre Apply pre- or post emergent in late summer or early fall. Use a MSO surfactant at 0.32 oz/gal or 1 gt/100ga1 water. The 12 oz rate of Panoramic 2SL may cause injury to some cool season grasses. Laramie 25DF 4 oz/acre An early post -emergent option. Must be activated with rainfall and applied when soil temps are cool. Moisture must arrive within 2-3 weeks of application. Add a non-ionic or MSO surfactant @ 0.32oz/gal water or 1 qt/100 gal water. Glyphosate *Non -selective herbicide. 41% concentrate min. 16 to 24 oz/acre Apply in fall or early spring. Add a non-ionic surfactant @ 0.32oz/gal water or 1 qt/100 gal water. Use caution when applying near grasses or other desirable vegetation Rejuvra 5 oz/acre A pre -emergent chemical — it will not kill established growing plants. Can be tank mixed with Glyphosate, Panoramic 2SL or Plateau. Apply in August to March. Add a non-ionic surfactant @ 0.32oz/gal water or 1 qt/100 gal water. Prowl H2O Short Term 2-4 months: 2.1 quarts/acre Long Term 6-8 months: 4.2 quarts/acre A pre -emergent chemical —it will not kill established growing plants. Can be tank mixed with Glyphosate, Panoramic 2SL or Plateau. Spray solution may stain porous surfaces Length of control is dependent on weather conditions. Not labeled for use in range and pasture settings. Rangeland -Pasture Recommendations Field Bindweed Identification and Management Field bindweed (Convolvulus arvensis) is a non-native deep-rooted perennial that reproduces from seed and creeping, horizontal roots (rhizomes). Field bindweed stems are prostrate (grows low to the ground) and twining, and grow up to 6 feet long. Leaves are distinguishable by their arrowhead shape. The flowers are bell or trumpet -shaped, white to pink in color, and are about 1 inch long. Field bindweed seeds can remain viable in the soil for up to 40 years. Field bindweed emerges from its root system in the spring. Flowering occurs from June to September and until the first fall frost. The number of seeds produced per plant ranges from 25 to 300 and seed production is variable depending on environmental conditions. Field bindweed is an extremely difficult noxious weed to control because, in part, of its root that may go 20 feet deep into the soil, and which repeatedly gives rise to numerous long rhizomes. Field bindweed is a problem throughout Colorado. It is one of the most competitive perennial weeds. It is widespread in cultivated areas, pastures, lawns, gardens, roadsides, and waste areas from 4,000 to 8,000 feet in elevation. To successfully manage field bindweed, containment and persistence in controlling existing stands are necessary to exhaust the root system and deplete the soil seed bank. This weed needs to be continually stressed, forcing it to exhaust root nutrient stores and eventually die. Of all control methods, prevention is most important. Maintain healthy pastures and rangeland and continually monitor your property for new infestations. A healthy cover of desirable perennial plants will assist in discouraging field bindweed establishment. On the backside of this sheet are field bindweed management recommendations. If you have any questions or would like more information, please contact the Weld County Public Works Department, Weed Division at (970) 304-6496 ext 3770. Please visit our website www.weldweeds.org. Recommended management methods: Cultural - Establishment of selected, aggressive grasses can be an effective cultural control of field bindweed. Contact your local CSU Extension office or Natural Resources Conservation Service office for seed mix recommendations. Good grazing management will stimulate grass growth and keep pastures healthy. Healthy pastures may be more resistant to field bindweed invasion. Bare spots caused by overgrazing are prime habitat for weed infestations. Mechanical - Cutting, mowing, or pulling has a negligible effect unless the plants are cut below the surface in the early seedling stage. Well -established populations have a large seed bank in the soil that can remain viable for over 40 years. Biological - The bindweed gall mite, Aceria rnahlerbae, has proven to be effective in reducing field bindweed infestations. Biocontrol agents can be obtained at no charge from the Colorado Department of Agriculture's Insectary. Please call 970- 464-7916 or go to www.palisadeinsectary.com for more information. Herbicides - The following are recommendations for herbicides that can be applied to range and pasturelands. Optimum results occur when the plants have recently received moisture and are actively growing. Always read, understand, and follow label directions. The herbicide label is the LAW! Herbicide Rate Application Timing/Comments Clarity Amine + 2,4-D 1 or 1 product qt./acre oz/gal for water each for each product Spring- DO degrees. DO permeability Add 1 qt/ NOT NOT non-ionic 100 at gal or apply apply just or water. when near where surfactant after or full outside water under -bloom a� temperatures trees level 0.32 and/or is oz/gal or high. where fall. water will soils or exceed have 85 rapid *Tordon 2,4-D *this Restricted Pesticide* is 22K Amine + Use 1 qt./acre or 1 oz/gal for water each for each product product Spring- DO degrees. DO permeability Add 1 NOT NOT non-ionic 100 at gal or apply apply just or water. surfactant after when near where full outside or water under -bloom @ temperatures trees level 0.32 and/or or is oz/gal high. where fall. water will soils or exceed have 85 rapid a qt/ *Roundup *Non herbicide. Will vegetation.* -selective kill all Ultra 4 or 4 —5 qts./acre —5 oz/gal water Apply Add water. Use _ vegetation. caution at a non-ionic full -bloom when Roundup surfactant applying and/or will fall. @ near possibly 0.32oz/gal grasses kill surrounding water or other or desirable 1 qt/ vegetation. 100 gal •-rilir 717 __'^—_ ___ _ •.`tee.• -- • Y •j ,'�1( .!-�`'.�y. • • -, .IBS •¢r •�,,;,4.. 'r•1'S • ? y r M . +•'. ,•+•.„7 '..-0, . . -- . . , • -4 7-C---,:..i. %"1" �. r • .7r • •„„" a- tiry -ie. is.49 r i •s r e .. • • • • •. • • w• • n re ter • • 4• • - • I • • •.•�• • . / ,,.• ..�, •• •••• S • !r& r..�; i .I. -‘• • . .•j .r` • •. • ••S • • PI .r • Tw 144 • see ado •` I. 4, y•. ' • SS. • • r ; • .1 ; •� • • '• • • So r• APPENDIX B GENERAL CHEMICAL/HERBICIDE SELECTION SHEETS Chemical Weed Matrix March 2019 Canada Thistle - Creeping perennial; 6-10 inches to bud or fall Musk Thistle; Scotch Thistle & Bull Thistle - Biennial; rosette stage or fall Russian Knapweed - Creeping perennial; bud to early flower or fall Diffuse Knapweed; Spotted Knapweed - Biennial or simple perennial; rosette stage or fall Field Bindweed - Creeping perennial; at full bloom or fall Hoary Cress; Perennial Pepperweed - Creeping perennial; bolting to bud maybe bloom Leafy Spurge - Creeping perennial; spring true flowers or fall** Absnith Wormwood - Perennial; 12 inches to flowering or fall Mullein - Biennial; Rosette to pre -bud or fall Yellow Toadflax; Dalmatian Toadflax - Creeping perennial; bud to early flowering or fall Cheatgrass (Downy Brome) annual; early germination, maybe spring 1 quart/acre Tordon 22K (Picloram)- RU No PLUS 2,4-D @ 1 trees or water; Graze -14D 1 quart/acre with 1 quart/acre 1 quart/acre 1 quart/acre with quart/acre 1 quart/acre 1 pint/acre 1- 1.5 pints 1 quart/acre with wait NIS with NIS with NIS NIS with NIS NA with NIS with NIS /acre w/NSS NIS NA Milestone (aminopyralid) - Some trees; To waters edge: 5-7 oz/acre with 3-5 oz/acre with 4 -6 oz/acre with 5-7 oz/acre with 7 oz/acre 7 oz/acre No irrigation; No Graze wait NIS NIS NIS NIS NA NA NA with NIS with NIS NA NA Curtai((Clopyralid & 2,4-D) - Some trees; No water; Graze - 2 -3 quarts/acre 1.5-2 quarts/acre with 3 quarts/acre 2 quarts/ acre 2 quarts/ 14 D wait with NIS NIS with NIS with NIS NA NA NA acre with NIS NA NA NA Transline (Clopralid) - Most 0.66 -1.33 pints/acre with 0.33 - 1 pints/ 1 - 1.33 pints 0.66 -1.33 pints/acre with trees; No water; Graze - no wait NIS acre with NIS /acre with NIS NIS NA NA NA NA NA NA NA 2.4-D - Careful trees; Maybe water = formulation; Graze - 1 quart/acre 3 quarts/acre 2 -3 quarts/acre 1 quart/acre 7D wait weak alone with NIS weak alone weak alone weak alone with NIS with NIS weak alone w/NIS NA NA Clarity/Banvel (Dicamba) - No 1 quart/acre trees or water; Graze - 21D wait weak alone with NIS weak alone weak alone weak alone weak alone weak alone NA NA NA 1 quart 1 quart 1 quart 1 quart Dicamba & 2.4-D - Graze - 7D; 1 quart each/acre each/acre with 1 quart each/acre each/acre with each/acre with each/acre No water or trees; with NIS NIS with NIS NIS NIS with NIS NA NA NA Glwhosate (40-50%) - Trees okay; Yes water depending on 4-5 3.3 quarts/acre; 2-3 quarts/ label; Non -selective 2 quarts/acre 1.5 quarts/acre NA 1.5 quarts/acre quarts/acre 4 quarts/acre partial control acre 2 quarts/acre 4-5 quarts/acre Panoramic (Imazapic) - Some trees; waters edge ok; No 8 -10 oz/acre 8 -10 oz/acre 8 oz/acre with 10 oz/acre with 10 oz/acre with 6-8 oz/acre with irrigation; Graze - no wait NA with MSO with MSO NA NA MSO MSO NA NA MSO NIS Tel. (Chlorsulfuron) - Some trees; waters edge ok; Graze - 1-2.6 oz/acre 1 oz/acre with 1 oz/acre with 1-2.6 oz/acre Yellow: 1.LS oz/acre with NIS; Dalmatian 2 - 2.6 no wait with NIS NIS NA NA NA NIS NA NA with NIS oz/acre with NIS NA Escort XP (Metsulfuron) - 1.5 to 2 oz/acre 1 to 2 1.5 to 2 oz/acre Some trees; waters edge ok; 1.5 to 2 oz/acre 1 to 2 oz/acre with NIS 1 to 2 oz/acre oz/acre with with NIS No irrigation; Graze - no wait with NIS with NIS (suppression) NA NA with NIS NA NA NIS (suppression) NA Vista XRT (Fluroxypyr) - Some 6 oz Vista and 6 oz Vista trees, some water; Graze - no 4-6 oz Vista and 4.4-6 oz Vista and 4-6 oz Vista and 4-6 oz Vista and 4- 1/2 pint 4-6 oz Vista and 23 oz /acre with and 1/2 pint wait 7 oz Milestone 4-7 oz Milestone 4-7 oz Milestone 7 oz Milestone Tordon 3.3 oz Opensight MSO NA Tordon NA NA Herbicide Options Around Various Water Situations ** The label is the law. Read it for more details. Outside banks of Top of Inside banks To waters edge To seasonally Drainage or irrigation ditch of Irrigation of wetlands, dry wetladns, non -irrigation ditch bank ditch rivers and lakes marshes , bogs In rivers In lakes ditch banks Notes Aquatic 2,4-D amine; EPA #: 34707-120 & 5905-549 & 11773-2 Glyphosate; (Rodeo - EPA 9: 62719-324) Arsenal (EPA #: 241-346) Garlon 3A (EPA#: 62719- 37); Vastlan (EPA#: 62719- 687) Clearcast (EPA #: 241-437) Banvel (EPA#: 66330-276) Milestone (EPA#: 62719- 519) Telar Triclopyr 3 (EPA #: 81927- 13) Yes Yes; up to 2 foot Yes - do not spray overspray into water Yes water surface allowed Yes Yes Yes Yes Yes, w/caution Yes, w/caution possible 120 possible 120 , day Yes, w/ 120 day day restriction restriction restriction Yes Yes, w/caution Yes, w/caution possible 120 possible 120 day Yes, w/ 120 day Yes, minimize day restriction restriction restriction overspray Yes Yes Yes Yes Maybe Maybe No No Yes, take precautions Maybe Maybe No to avoid drift No No No No Yes, minimize No No No overspray Yes; except for small canals with Yes Yes Yes less than 10 CFS Max. treatments/year2 Yes Yes Yes non -selective product Yes Maybe Yes Yes that will move Can contaminate Yes No No Yes ground water Limited Species of Yes Yes Yes Yes Control Do not contaminate No No No No water Do not apply directly Yes No No Yes to water Do not apply directly Yes No No No to water Yes No Yes Yes Range and Pasture Chemicals for Grasses Grazing Haying Reseeding Trade Name Chemical Trees Water Restrictions Restrictions Restrictions Newly Seeded Notes Well est./ 2nd root - Tordon 22K Picloram No No Dairy = 2wks 2 weeks 3-6 months 60 days max. rate is 2 gfacre/yr. License required. none if kept on property • not for sale for 18 Well estJ 2nd root - Milestone Aminopyralid Some edge ok none months 3-6 months 60 days 14 days to work..max. rate is 7oz/acre/yr Well esti 2nd, root — ForeFront HL Aminopyralid + 2,4-D Some edge ok Dairy = 7 D 7 days 3-6 months 60 days max rate is 84 oz/acre/yr none if kept on property • previous growing Aminopyralid + not for sale for 18 season and fully Do not use on Timothy or other cool season grasses for Opensight metsulfuron Careful edge ok none months 3-6 months tillered hay. max rate is 4 qts/acre/year - Do not use clippings, hay or Curtail Clopyralid + 2,4-D Careful No Dairy = 14 D 7 days 3-6 months Well est./ 2nd root manure for mulch for 18 months max rate is 1.33 pints/acre/yr - Do not use clippings, hay Transline Clopyralid Ok No none none 3-6 months Well est./ 2nd root or manure for mulch for 18 months Panormaic 2SL Imazapic Some edge ok none none 3-6 months well est,...5 leaf stage shows symptons slowly; max rate = 12 oz/acre Well esti 2nd root up to 3 weeks to show signs of treatment. At 1 1/3 for no Telar XP Chlorsulfuron Some edge ok none none 1-6 months 60 days restrictions. Max rate is 3 oz/acre/yr up to 4 weeks to show signs of treatment max rate is 1 2/3 Well est...3-4 leaf oz/acre/yr for no restrictions. At 3 1/3 oz/acre/yr 3 day Escort XP Metsulfuron Some edge ok none none 1-4 months stage interval Well estJ 2nd root - 2,4-D 2,4-D Maybe Maybe 7 days 30 days 3 months 60 days check for aquatic label max rate is 2 qts/acre/season Clarity Dicamba No No Dairy = 21 D 51 days 90 days Exceeds 3 leaf stage also sold as Banvel max. rate is 64 oz (4 pints)/acre/yr Outlaw, Weedmaster, Rangestar, Brash Dicamba + 2,4-D No No Dairy = 7 D 37 days 3 weeks and up 30-60 days max. rate is 8 pints/acre/yr near 8 wks after Glyphomax Glyphosate (41%) Ok edge application 8 wks after application 7 days not recommended non -selective 7 or more days to show symptoms 2 pounds of 2,4-D/acre/application. Minimum 21 days 2,4-D, Fluroxypyr and Not indicated on the between applications. Limited to 2 applications/year. Don't E2 Dicamba No No Dairy - 7 D 7 days 3 weeks and up label use on buffalograss. Not indicated on the Remove meat animals eating treated forage 2 days before Vista XRT Fluroxypyr Some some none 7 days 4 months label slaughter. Maximum use 23 oz/acre Well established. 1-2 Esplanade 200SC Indaziflam yes No Not Allowed Not Allowed 8 months min. years Do not use more than 10 oz/ 12 calendar months ** Read the label. It is the law and may change from year to year. March 19, 2019 Hello