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HomeMy WebLinkAbout20161769.tiff AFFIDAVIT FROM THE WELD COUNTY CLERK & RECORDER This will acknowledge receipt of maps and text exhibits for a revised Technical Revision for an as yet un-approved Mined Land Reclamation Board Application for a Construction Materials 112 Regular Permit for the Chavers Mining Resource (Permit No . M-2015 - 030) . These maps and text exhibits are on file in the office of the Weld County Clerk to the Board, 1150 "0" Street, Greeley, Colorado, 80631 , for public inspection. Dated this ` 5•Xill'1/4c-i S i °13 4 RECEIVED i , JUN 082016 WELD COUNTY Weld ounty Clerk to the Board COMMISSIONERS I 1 ;4,Lize: CC ; ?ti L/O„) 0/f 2016- 1769 6 . 4 . 4 EXHIBIT D - MINING PLAN (TECHNICAL REVISION , REVISED VERSION 1 . 0 , JUNE 2016 -CONCURRENT WITH ACTIVE PERMIT APPLICATION APPROVAL) Mining Description The Mining Plan is described in this section and correlates with Exhibit C -2 - Mine Plan Map . Mining is sequenced with designated mining Cells 1 - 5 as shown on Exhibit C-2 . Mining will be accomplished by the "dry- mining " method . Prior to excavation below the water table , an approved temporary substitute water supply plan ("TSSP ") from the Colorado Division of Water Resources will have been obtained for this mining operation . Mining will employ conventional aggregate mining techniques including the use of scrapers and backhoes to excavate topsoil , overburden and sand and gravel and haul trucks to move materials as either backfill or as sand and gravel to be further processed at the gravel plant site . Sand and gravel processing will be located onsite and finished materials will be trucked offsite . The mine plan map shows a fixed gravel plant location with stockpiles in the south -eastern area of the site for the entire life of the project , other than for a short period where this location will be mined (6 months ) . A concrete plant is also shown in the south - eastern corner of the site and will be located in this area for the life of the mine . The concrete plant location will have been mined and backfilled prior to the plant being erected and becoming operational . This location is out of the newly designated DRAFT (as yet without final approval by FEMA) location of the Floodway of the South Platte River in this area , but is still in the Floodplain . A Floodplain Use Permit has been obtained from the designated Floodplain Administrator from the City of Ft . Lupton for mining in this location . All river banks on the east side of the South Platte River on this site and further onto the point bar at the western edge of the site are heavily rip- rapped with large chunks of concrete . Flooding in this area of the South Platte River in September 2013 and again in May 2015 did not affect this property . Earthwork Earthwork will generally occur as indicated in Table 6 . 4 . 4- 1 . Sand and gravel extraction will follow stripping of areas of each mining Cell . Reclamation will occur concurrently wherever possible . June 2016 Chavers Mining Resource Regular 112 Permit Application "Active " Technical Revision Text L 6 . 4 . 4 EXHIBIT D — MINING PLAN Table 6 .4 .4- 1 . Earthwork Table VOLUME OF SEQUENCE OPERATION OPERATION STOCKPILE STOCKPILE O O 3 NUMBER CELL LOCATION [ydI 1 . Strip West 1/2 Cell 2 East I/2 Cell 73 , 200* Overburden 2 2 . Strip East IA Cell 2 None None Overburden (direct /Backfill Oil & replacement) p ) Gas Area 3 . Strip North 1/2 Cell 3 East 1/2 Cell 70 , 300 * Overburden 3 4 . Strip South 1/2 Cell 3 None None Overburden/ (direct Backfill Oil & replacement) Gas Area 5 . Strip East 1A Cell 4 East 1/2 Cell •-• 10 , 000 Overburden 3 6 . Strip West 1A Cell 4 None None Overburden direct /Backfill Oil & replacement) Gas Area 7 . Strip West 1A Cell 5 East 1A Cell 10 , 000 Overburden 3 8 . Strip East 1A Cell 5 None None Overburden (direct /Backfill Oil & replacement) Gas Area *Maximum stockpile occurring at any one time June 2016 Chavers Mining Resource Regular 112 Permit Application "Active " Technical Revision Text 6 . 4 . 4 EXHIBIT D — MINING PLAN Water Diversions Water diversions within the mining pit will include pumping groundwater from a collection sump within the pit before discharging to the South Platte River to the west of the permit area . Dewatering trenches leading to the sump will be cut into the claystone to drain the alluvial sand and gravel deposit to be mined . Plant wash water will be obtained from an existing permitted alluvial well on the property owned by the applicant that is outside of the perimeter of the mining pit . Wash plant water is recycled in a continuous loop and will only need to be occasionally supplemented with the alluvial groundwater from the well . Timetable and Size of Mining Areas The mining operation is expected to last for approximately 7-9 years , however , this could vary depending upon market conditions . The approximate size of areas to be worked at any one time correlates to the size of the mining Cells shown on Exhibit C -2 . Table 6 . 4 . 4-2 shows the mining Cell size and the approximate timetable for working each Cell . Table 6 . 4.4-2 . Mining Timetable MINING CELL APPROXIMATE AREA TO APPROXIMATE BE WORKED AT ANY ONE TIMETABLE TIME [acres] [years] Cell 2 23 2 - 3 Cell 3 23 3-4 Cell 4 4 0 . 5- 1 Cell 5 4 0 . 5- 1 TOTAL 58 7-9 Nature of the Deposit The average overall total overburden thickness is approximately 3 . 5 to 4 . 0 ft . Of that overburden , a large portion of the proposed permit area contains two types of topsoil that vary from within 6 " to 24 " in depth . Much of this soil has been overgrazed and compacted . The majority of this topsoil is in the range of 12 " to 24 " in depth . This covers at least 50 acres of the site , except for the steeper area on the very eastern/south -eastern edge of the permit area . This topsoil will be stripped by scrapers and segregated from the underlying overburden and placed into separate stockpiles as shown on the mine plan ( C-2 ) prior to overburden removal and stockpiling by the same method . All topsoil and overburden stockpiles will be vegetated with a temporary cover crop/seed mix if remaining for more than one year in an undisturbed state . The sand and gravel deposit to be mined varies in thickness , with an average thickness of approximately 28 ft . It varies from sandy lean clay in the upper June 2016 Chavers Mining Resource Regular 112 Permit Application "Active" Technical Revision Text 4 6 . 4 . 4 EXHIBIT D — MINING PLAN zones , to coarse clayey sand and sand with gravel nearer the bedrock . The gravel typically found in this area - yp y has a history for being processed into high quality concrete aggregates and other aggregate construction materials . The underlying strata on the property is a claystone bedrock . Commodities The primary commodity is sand and gravel to be used for the construction industry . There are no incidental commodities . Explosives No explosives will be used for the mining operation . June 2016 Chavers Mining Resource Regular 112 Permit Application "Active " Technical Revision Text 6 . 4 . 5 EXHIBIT E — RECLAMATION PLAN Overall Description All areas adjacent to oil and gas wells will be backfilled to a radial distance of 200 ft . A Surface Use Agreement ( SUA) has been signed and put into place with Anadarko Petroleum for this permit area in October 2008 which outlines the responsibilities with respect to land uses for both Anadarko and ASCI , including backfilling . Major reclamation operations will backfill pit slopes from 1 H : 1 V with a clay liner at 1 . 5H : 1V and with final controlled overburden backfill at 3H : 1 V. The pit will be reclaimed as a clay- lined water-storage reservoir with rip- rapped slope protection placed on the reservoir slopes to 10 ft . below the normal pool elevation . All affected areas above the normal pool elevation of the reservoir will have overburden soil replacement , topsoil replacement and be re-vegetated with native vegetation followed by a weed control program . Exhibit F Sheet 1 - Reclamation Plan Map shows final grading and soiled / re-vegetation areas . The largest overburden stockpiles to occur at any one time ( not including finished construction material ) shall be approximately 70 , 000 yd3 . Reclamation Earthwork Reclamation earthwork will occur concurrently with mining where possible . Oil & gas operation areas are to be backfilled in a pre-determined time-frame as noted above and as specified by the SUA . Reclamation earthwork and operations will generally follow the sequence specified in Table 6 . 4 . 5-2 , however variations to the sequence may occur depending upon operational constraints . Overburden removal and mining and stockpiling of the sand and gravel from Cell 1 (the concrete plant location ) will have been accomplished prior to actual start- up of the major mining and processing of the sand and gravel on this site . This is so the concrete plant will have a location for continuous operation for the life of mining on the Chavers mine site . The majority of the site will follow a more standardized sequence of dry mining and reclamation . This type of reclamation will begin following completion of mining of the western 1/2 of Cell 2 and reclamation activities will backfill the oil & gas operation area in the West 1/2 of Cell 2 with stockpiled overburden from the East 1/2 of Cell 2 . Following completion of mining of the East 1/2 of Cell 2 , the oil & gas operations area in the East 1/2 of Cell 2 will be backfilled with overburden from the East 1/2 of Cell 2 and stockpiled overburden . Following mining of the South 1/2 of Cell 3 , the oil & gas operations area in the South 1/2 of Cell 3 will be backfilled with overburden from the stockpile located in Cell 3 . Following mining of the East 1/2 of Cell 4 , the oil & gas operations area in the East 1/2 of Cell 4 will be backfilled with overburden from the West 1/2 of Cell 4 (direct replacement) and overburden from the stockpile located in Cell 3 . The gravel plant will be relocated to the pit floor of Cell 4 to complete mining in Cell 5 . Following mining of the West 1/2 of Cell 5 , the oil & gas operations area in the West 1/2 of Cell 5 will be backfilled with overburden from the East 1/2 of Cell 5 (direct replacement) and overburden from the stockpile located in Cell 3 . Following backfilling of the oil & gas operation area in Cell 5 , construction of the clay liners will occur around the perimeter of the pit following all June 2016 Chavers Mining Resource Regular 112 Permit Application "Active " Technical Revision Text 6 .4 . 5 EXHIBIT E — RECLAMATION PLAN mining and concurrent reclamation activities for each lined cell and prior to final controlled backfill on top of the clay liner with stockpiled overburden located in Cell 3 . Table 6 . 4 . 5 -2 . Reclamation Earthwork Table SEQUENCE OPERATION TIMING BORROW EARTHWORK NUMBER SOURCE VOLUME (yd3] 1 . Backfill Oil & Following Stockpile 60 , 000 Gas Completion of Located in Operations Mining the Area in West West 1/2 of East 1/2 of 1/2 of Cell 2 Cell 2 Cell 2 2 . Backfill Oil & Following Overburden 60 , 000 * Gas Completion of From the Operations Mining the East % of Area in East 1/2 East 1/2 of Cell Cell 2 (direct of Cell 2 2 replacement) & Stockpile in Cell 2 3 . Backfill Oil & Following Overburden 43 , 000 Gas Completion of From the Operations Mining the Area in Cell 3 South 1/2 of Stockpile in Cell 3 Cell 3 4 . Backfill Oil & Following Overburden 47 , 672 Gas Completion of From the Operations Mining the West 1/2 of Area in East 1/2 East 1/2 of Cell Cell 4 (direct of Cell 4 4 replacement) & Stockpile in Cell 3 5 . Backfill Oil & Following Overburden 29 , 470 Gas Completion of From the Operations Mining the East 1/2 of Area in West West 1/2 of Cell 5 (direct 1/2 of Cell 5 Cell 5 replacement) June 2016 Chavers Mining Resource Regular 112 Permit Application "Active " Technical Revision Text 6 . 4. 5 EXHIBIT E - RECLAMATION PLAN & Stockpile in Cell 3 Backfill Slopes Following all Stockpile 57 , 998 6 . From 1 . 5 : 1 to mining and Lo cated in 3 : 1 clay liner Cell 3 construction 7 . Replace Following final Stockpiles in 20 , 000 topsoil from 1 grading Cells 2 , 3 to 1 . 5 ft . depth 8 . Seed and Following soil implement replacement weed control *Maximum stockpile occurring at any one time Clay Liner Construction Following backfilling of the oil & gas operation area in Cell 4 , construction of the clay liners will occur around the perimeter of the pit following all mining and concurrent reclamation activities for each lined cell and prior to final controlled backfill on top of the clay liner . Clay material will be moisture conditioned , stripped from the pit floor and placed in lifts surrounding the perimeter of the mined -out pit areas . Clay volumes are given in Table 6 . 4 . 5-2 . The clay liner geometry is shown on Exhibit F - Reclamation Plan Map , Sheet 2 . Clay material will be compacted in 9 in . lifts to 95 % dry density and at or up to 2 % greater than the optimum moisture content . This compaction criteria will also be achieved for the clay liner keyway at a depth of 5 ft . below the reservoir bottom . Costs to construct the clay liner are given in Exhibit L- Reclamation Costs . Table 6 . 4 . 5-2 . Clay Liner Volumes Mining Cell Volume [yd3] Cell 1 135 , 489 Cells 2 , 3 , 4 187 , 103 June 2016 Chavers Mining Resource Regular 112 Permit Application "Active " Technical Revision Text 6 .4 . 5 EXHIBIT E - RECLAMATION PLAN Topsoil Replacement Stockpiled topsoil will be placed to a minimum depth of 1 . 0 ft . on all affected areas above the normal pool elevation of the reservoir. The total area to undergo overburden soil replacement is 14 acres and the total topsoil replacement volume is approximately 20 , 000 yd3 . This includes the edges of the reservoir and all oil and gas operations areas where backfilling occurred . Topsoil replacement will occur sequentially just after backfilled overburden placement wherever possible to allow for mining under topsoil and overburden stockpiles . I Seeding and Fertilizing Currently , the entire pit area is used for dryland pasture and is over-grazed . The proposed seeding areas are shown on Exhibit F — Reclamation Plan Map . The recommended seeding method is by drill and seeding rates assume this method . The species composition of the seed mixture recommended for reclamation is shown in Table 6 . 4 . 5-2 below . Table 6 .4 . 5 -2 Recommended Seed Mixture . Species (Variety) Rate - pure live Native/ W/C Cost seed (pls) Introduced Season pls/ac lbs/ac Thickspike wheatgrass 8 . 0 to 10 . 0 Native Cool $ 11 . 70 (Critana ) Sideoats grama (Vaughn ) 5 . 0 to 7 . 0 Native Warm $7 . 25 Switchgrass ( Nebraska-28 ) 4 . 0 to 6 . 0 Native Warm $ 5 . 00 Alfalfa ( Nomad ) 3 . 0 to 5 . 0 Introduced NA $ 1 . 90 TOTAL 20 . 0 to 28 . 0 $28 . 85 Based on this seed mixture , an application rate of approximately 20 . 0 to 28 . 0 pls/ac will be used . Soil will be disked prior to seeding . It is recommended that fertilizer be utilized in conjunction with seeding . A standard application of fertilizer will be used and applied at a rate of 250 lbs/ac . The total area to be seeded is approximately 14 acres . The total area to be fertilized is approximately 14 acres . Seeding and fertilizing will be completed as soon as possible after the overburden soil is backfilled , smoothed to June 2016 Chavers Mining Resource Regular 112 Permit Application "Active " Technical Revision Text 6 .4. 5 EXHIBIT E — RECLAMATION PLAN conform to the reclamation topography , and topsoil is placed and finally disked . Optimal periods of seeding are in the fall (after November 1st) or in the spring from late March up to April 30th . Mulching will not be completed , as the quality topsoils and availability of water should facilitate the rapid establishment of perennial grasses . Following revegetation , weed management strategies will be implemented to facilitate and achieve native grassland . Years 1 thru 5 following revegetation will include an aggressive mowing program to prevent the growth and establishment of weeds , specifically , eight noxious weeds including : Canada thistle ( Cirsium arvense) , Dalmation toadflax ( Linaria dalmatica) , diffuse knapweed ( Centaurea diffusa) , leafy spurge (Euphorbia esula) , musk thistle ( Carduus nutans) , Russian knapweed ( Centaurea repens) , spotted knapweed ( Centaurea maculosa) and Yellow toadflax ( Linaria vulgaris) as mandated by Colorado State Law ( 35-5 . 5CR51990 , 1996 ) . If needed , herbicide application will be applied to further control these weeds . Herbicides will also be used to control saltcedar ( Tamarix spp . ) if it becomes established in the reclaimed area . Table 6 . 4 . 5-3 presents recommended herbicides , application rate , and time of application for each of the 9 species . It may be necessary to replant treated areas . Alternative Reclamation Plan There is no alternative reclamation plan . 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