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Home My WebLink About20022454.tiff ROCKY MOUNTAIN CONSULTANTS, INC. Weld County Planning Department 4MC GREELEY OFFICE Premiere Building 825 Delaware Ave.,Suite 500 APR 1 9 2002 Longmont, CO 80501 (303) 772-5282 Metro (303) 665-6283 RE C E I V E Q FAX (303) 665-6959 April 18, 2002 rst Initial, last name)@long.rmcco.com Ms. Char Davis Weld County Department of Public Health and Environment 1555 North 17th Avenue Greeley, CO 80631 RE: USR 1354-AGGREGATE INDUSTRIES-WCR, INC.,MILLIKEN RESOURCE Dear Char: Enclosed is evidence of Aggregate Industries—WCR, Inc.'s application for an APEN for the Milliken Resource site and receipt of the NPDES permit for the Milliken Resource Site. Please contact us if you have any questions. Sincerely, ROC Y MOUNTA �ULTANTS, INC. aatA Sarah Smith, E.I.T. Environmental Planning Technician cc: Kim Ogle,Weld County Department of Planning Services Norm Roche,Aggregate Industries—WCR, Inc. Enclosures H:U919_007\WeldCty\CharDavisIetter2.doc 2002-2454 t�t�1� IT xl �� CIVIL AND ENVIRONMENTAL ENGINEERING • PLANNING tat.# Y Page 14 of 56 Source(s) : [ STORAGE SILO, AIRS# 035-0090-008, FLY ASH SILO ] [ STORAGE SILO, AIRS# 035-0090-007, CEMENT SILO #4 ] [ STORAGE SILO, AIRS# 035-0090-006, CEMENT SILO #3 ] [ CEMENT HANDLING/UNLOADING, AIRS# 035-0090-005, CEMENT SILO #2 ] [ CEMENT HANDLING/UNLOADING, AIRS# 035-0090-004, CEMENT SILO #1 ] [ CONCRETE BATCH PLANT, AIRS# 035-0090-003, CONCRETE BATCH PLANT ] [ BOILER, AIRS# 035-0090-002, WATER HEATER - NAT GAS ] [ CONCRETE BATCH PLANT, AIRS# 035-0090-001, CONCRETE TILT MIXER ] Permit: 12DG0634 Service: FA, Transfer Plant Ownership Received: 08/31/2001 Status: Final Approval Granted Engineer: Fadeyi, Sunday Final Permit on: 12/04/2001 Click to E-mail or call (303) 692-3202 Facility: AGGREGATE INDUSTRIES-WCR, INC. - FRANCIS, 15 S FRANCIS ST, LONGMONT, 80501-5857 Source (s) : ( MATERIAL HANDLING, AIRS# 013-0058-003 ] [ CONCRETE BATCH PLANT, AIRS# 013-0058-001, ERIE STRAYER CONCRETE BATCH PLANT, SN: AS57487 ] Permit: 83B0286 Service: Final Approval Received: 08/22/2001 Status: Final Approval Granted Engineer: None Assigned Final Permit on: 11/19/2001 Facility: AGGREGATE INDUSTRIES-WCR, INC. -MILLIKEN, 22434 STATE HIGHWAY 60, MILLIKEN, 00000 Source (s) : [ GRAVEL PIT/SAND, AIRS# 123-1338-001, SAND & GRAVEL EXTRACTION ] Permit: 02WE0120F Service: Initial Application Received: 02/01/2002 Status: In Process Engineer: Akins, Jon Click to E-mail or call (303) 692-3240 Facility: AGGREGATE INDUSTRIES-WCR, INC.-FRANKTOWN, 2571 N HIGHWAY 83, DOUGLAS CTY, 80116-9624 Source(s) : [ CONCRETE BATCH PLANT, AIRS# 035-0420-001, READY-MIX CONCRETE PLANT ] Permit: 01DG0840 Service: FA, Transfer Plant Ownership Received: 09/12/2001 Status: Final Approval Granted Engineer: Hancock, Rk Iii (chi Final Permit on: 01/10/2002 or call (303) 692-3168 Facility: AGGREGATE INDUSTRIES-WCR, INC.-JOHNSTOWN, 205 N. PARRISH ROAD, WELD COUNTY, 80534 Source(s) : [ CONCRETE BATCH PLANT, AIRS# 123-0578-001, HOMEBUILT PLANT FROM REX MANUFACTURED EQUIPMENT ] Permit: 00WE0500.XP Service: Permit Exempt, APEN Only Received: 08/22/2001 Status: Exempt from Permit (XP) Engineer: Akins, Jon Click to E-mail or call (303) 692-3240 Facility: AGGREGATE INDUSTRIES-WCR,INC.-WW FARMS P, COUNTY ROAD 27 AT COUNTY ROAD, 1 MI NW OF GREELEY, 80631 http://www.cdphe.state.co.us/ap/ss/sspcpt_a.htm] 4/17/2002 APR-18-2002 THU 08:47 AM AGGREGATE INDUSTRIES FAX NO. 3037165299 P. 02 ♦ Q i !i� s v N 9 w ii tf :0D _ rc: D a D n y +' t r4 J ,i.. a„ DETACH AND RETURN TOP PORTION WITH PAYMENT NOTE: FAILURE TO RETURN TOP PORTION OF INVOICE WITH ENACT PAYMENT MAY RESULT IN A DELAY OF CREDITING YOUR ACCOUNT AND MAY RESULT IN IMPROPERLY CREDITINC YOUR PERMITTING FEE INVOICE THE FOLLOWING CHARGES HAVE BEEN INCURRED FOR THE PROCESSING OF PERMIT/APPLICATION I 02WE0120F . PURSUANT TO THE PROVISIONS SET FORTH IN THE COLORADO AIR POLLUTION PREVENTION ANDCONTROL ACT,THE FOLLOWING FEES FOR PROCESSING.ADMINISTRATION,AND/OR ENFORCEMENT REGARDING THE AIR POLLUTION EMISSION PERMIT/APPLICATION SPECIFIED ABOVE ARE DUE. OTHER ITEMIZED FEES MAY ALSO BE INCLUDED. YOUR AIR EMISSION PERMIT WILL BE ISSUED AS SOON AS PAYMENT IN FULL IS RECEIVED BY THE DIVISION. PLANT NAME; AGGREGATE INDUSTRIES-WCR,INC.-MLLIKEN LOCATION: 22434 STATE HIGHWAY 60 SOURCE DESCRIPTION: BILLING DATE: 3/15/2002 INVOICE NUMBER: 202003913 DUE DATE: &(WW2 EVENT DESCRIPTION HOURS/QTY AMOUNT INITIAL APPLICATION 624 $374.25 APEN PEES Q. 1 SO.00 PUBLIC NOTICE FEES ' �` 0 30.00 TOTAL ADIUSTMENTS CURRENT CHARGES: MOM o. MAKE CHECK O% `4\9 � PAYABLE TO > COLORADO DEPARTMENT OF PUBLIC HEALTH&ENVIRONMENT ` /� DEPT 436 `V !� DENVER,CO.50251-0436 APR-18-2002 THU 08:47 AN AGGREGATE INDUSTRIES FAX NO. 3037165299 P. 03 Permit No. COG-500000 Facility No. COG-500418 CDMG No. Pending Page I AUTHORIZATIC??TO DISCHARGE UNDER THE CDPS INDUSTRIAL GENERAL PERMIT FOR SAND AND GRAVEL MINING AND PROCESSING GENERAL PERMIT Category 07,Sub-category IA-General Permits,Sand and Gravel-Process Water&Stonnwater St.code 1440 Sand and gravel mining, washing,crushing screening and stockpiling. Current fee S132/year per CRS 25-8-S02 This penult specifically authorizes, Aggregate Industries—WCR.Inc Norm Roche,Manager,Marker Development 3605 South Teller Street Lakewood, Co. 80235 (303)+985-1070 with the facility contact of Thomas Maul 3605 South Teller Street Lakewood Co. 80235 (303)+985-1070 to discharge from facilities identified as Milliken Sand and Gravel,located in the SW'/4 ofthe NW V.of Section 8 74N,R66W, Weld County, as shown in figure 1 of the permit from Discharge Points 001, 002, 003.and 004. Discharge Points Description and treatment Estimated Flow Rate 001. 00?, 003, Avg. 6.0 MGD and 004 Discharge from the settling basin before entering the South Platte River. .1"" Mas. =20.0 MGD The discharges are to the South Plato River,Segment I of the Lower South Platte River Sub-basin,South Pierre River Basin,found in the Classifications and Numeric Standards for South Platte River Basin(5 CCR 1002-38);last update effective June 30, 2001. Segment 1 has been classified for the following uses: Recreation, Class la;Aquatic Life, Class 2(Warm);Agriculture. Salinity(IDS)monitoring of the discharge will not be required. Phosphors monitoring of the discharge will not be required. Anadegradation review does not apply to this permit. Water Use Protected At the time ofapplication,the pennittee certified that they had developed and implemented a Stormwater Management Plan(SWMP)for this facility. As a condition of this permit,a copy of the SWMP must be provided to the Division upon request. The permitsee is encouraged to read the general rationale for an understanding ofhow this permit was developed and read the permit to see what requirementsexist. In the permit,effluent limitations and monitoring/reporting requirements are specified in Parts I.C,and ID.: special notification requirements for effluent violations are addressed in Pan 11A. All correspondence relative to this facility should reference the specific facility number, COG-500418. Karen Young February 12, 2002 Effective February 12,2002 Expires September 30,2002 This facility permit contains 25 pages. AS January 29,2002 AGGREGATE INDUSTRIES CDPHE—APCD ATIN: Aaron Frame 4300 Chary Creek Drive South Denver,CO 80222-1530 RE: Aggregate Iadustdes—WCR,Inc. Materials Division: Ivfilliken Fugitive Dust Dear Aaron, Enclosed please find a filing fee and the necessary documents to permit our new sand and gravel site near Milliken,CO. Since we are not exactly sure when operations at the Milliken site will commence,I will submit a Thirty-Day Notice of Start-up closer to the actual time of start-up. Please call me at(303)716-5395 if you have any questions. r", Thank you. crwerely, k Deborah Ferraro Environmental Affairs Representative Enclosures CC: Mike Refer,VP,Administration and Public Affairs,AI Norm Roche,Manager,Market Development,Al Pat Ward,VP/GM,Materials Division,AI !IMO Aggregate Industries Wise Gad Iteglooto 3605 South Toiler Street Lakewood,CO 8023$ Tok+phone:303-985-1070 An Equal Opportunity Employer 80 'd. 863291L£08 'ON. Xdd S3INASf1@lI 3J.d93NO9d lid 8Z,Z0 f1HJ. ZOOZ-II-Ndd • APPLICATION FOR AIR POLLUTION EMISSION PERMIT OR PERMIT MODIFICATION This application must be filled out completely except for#14 and#15: otherwise.application will be considered incomplete-SEE INSTRUCTIONS ON REVERSE SIDE. Mail completed application APENs and filing ice to: Colorado Department of Health • APCD•SS-B1 4300 Burry Creek Drive South Darer, Colorado 80222-1530 Telephone:(303)692-3150 I. Permit to be issued to:Aggregate Industries-WCR, Inc. 2. Mailing Address: State: 3605 S.Teller St.,Lakewood,CO 80235 Zip Code: 3a. Agent for Service(See No. 3 on reverse) 3b. Federal Tat Idemilleation Number: 84-040-4340 4a. General Nature°faur(ttess Praxes Sand and Gravel 4b. SIC Code: 1442 5a. Air Pollution Source Description: NEW SOURCE Sb.Days per year source will _ operate: 250 6a. Some Location Address(Include Location Map): 22434 State Highway 60-Milliken,CO 6b. U7M Coordinates(In bn) ofoiniumoweisareOSao.rswn.a.,.. as'Human) Coway Weld H V 7. ESTIMATED COSTS: Air Pollution Coated Procedures or Equipment 7a. Source, Process Equipment or Project: 7b. Capital Cost$ N/A Cap.Coat S N/A 7c. Operating_Cost:S _ 8a. STATUS II New Air Pollution Source ❑ Motifrcation w Permitted Source(Control Equipment added process change, etc.): D Matter of Ownership—7Ymtshrred from: D ids tug Source-not pe ndtted(Include Date of Sown Stan-up):— D Other- Profited Data for Cannata,to: Projected Source&map Date: • 8b.Begin 8c. End: 8d Midi 2001 9. Enclose thectto cover APEN FILM PEES. One APEN should be tilted for each emission point NOTE Additional proatwingfsa amt also be paid prior:o pernat issuance. I APENS aR$119.96 par ADEN S 10. SIGNATURE OFLEW'S OR®WSON=Vendor or 11fr Date • 11b. Telephone No.: EgsdpmensManolacturet) • 1129 02— Nam Roche.Manager, Maurer Develapmeat,AI 12. Type or Print name and cilldaltklegf perm signing hate10. 14 DATE RECEIVED: uac l4. 13. Cheek appeopriatebox it yen wants a.D Copy afpnlbninary mta vb conducted by Division 15.PERMIT NUMBER b. D To review draft ofthe prat prior to issuance? Se, orrrry.lea.rwwk+a.•O=MISSSW-....Z .Se Mn r 60 'd 663291LE0E 'ON Xlid S3Ia1SfI0NI 316038000 Nd 6E:20 NI Z00Z-I1-3dd (figki Permit No.NEW AIR POLLUTION EMISSION NOTICE(APEN) AND CONTROL PLAN FOR FUGITIVE PARTICULATE EMISSIONS Name of Firm: Aggregate Industries—WCR,Inc. Mall Address: 3605 South Teller Street Contact Person: Mr.Norm Roche Phone No.: 303-985-1070 Project Location: 22434 State Highway 60 UTM Coordinates: Description of Activity: Sand and Gravel Excavating and Processing No.of Employees: 12 Property.Area: 475.2 acres Seasonal Throughput(% of Annual): Dec-Feb 10% Mar-May 30% Jun-Aug 30% Sep-Nov 30% Estimated Starting Date: 2005 Estimated Date of Completion: 15 years Work Schedule: 5 -6 days/week, 8-10 hours/day,50 weeks/year Estimated Maximum Anneal Production(Phis production rate will be a permit limitation, increases in this rate will require a permit modification.) 1,500,000 tpy Material produced(Rock,Coal, )Sand and Gravel Signature of Person Authorized to Supply Data Typed or Printed Name and Title: Mr.Norm Roche, ger,Market Development Date: 1/29/02 Company Name:Aggregate Industries—WCR,Inc. Telephone: 303-985-1070 Mailing Address: 3605 S.Teller St.,Lakewood,CO 80235 A site diagram should also be submitted showing the general configuration of operation,and location of site including property boundaries For APCD Use County ID AQCR Set ID NEDS Der once. MU Caordtmne SCC Code Zone horn. Vat 01 'd 88Z991L£0£ 'ON NI 3LHJ3f9OV Nd. OE:ZO OHL DM-II-NV I =---J I. TOPSOIL A. REMOVAL Maximum tons removed per day -3,500 TPD Tons removed per year— 10.000 TPY Proposed controls for topsoil removal: (chock appropriate boxes) G Moist Material ❑ Water Spray ❑ Other(specify) ❑ No control B. TOPSOIL STOCKPILE Maximum stored at one time 30,000 tons. Maximum stored per year 30,000 tons. Length of time pile remains undisturbed—Less than 2 years(average) Proposed controls for topsoil stockpile:(check appropriate box) ❑ Watering times/day,or continuous sprinkler(to maintain moist surface). ❑ Chemical stabilizer(Type: ) ❑ Compacting of piles,method ❑ Enclosures: complete,or partial(check one) • Revegetation,(Length of time till revegetation—12 months) ❑ Other(specify) ❑ No control II, OVERBURDEN A. REMOVAL Maximum tons removed per day—5,000 TPD 2 II 'd 663291L202 '0N XU3 SHIdL.S(XNI 31d93NOOd lid 02:30 f1111. ions removed per year—125,000 TPY Equipment used for removal—scrapers,front-end loaders Proposed controls for overburden removal:(check appropriate boxes) e Moist Material ❑ Water Spray ❑ Other(specifY) ❑ No Control B. OVERBURDEN STOCKPILE Maximum stored at one time 300,000 tons. Length of time pile remains undisturbed—2.25 years Proposed control for overburden stockpile:(check appropriate boxes) O Watering times/day,or _ continuous sprinkler(to maintain moist surface). ❑ Chemical stabilizer(Type: ) ❑ Compacting of piles,method: ❑ Enclosures: complete,or partial(check one) $ Revegetation,(Length of time till revegetation—1 year) r ❑ Other(specify) ❑ No control a DRILLING MATERIAL OVERBURDEN ROCK COAL OTHER No.of holes drilled per day No.of days of drilling per year Hours of drilling per year Proposed controls Drilling Controls: r 3 ZI 'd 66Z99IL£0£ 'GI Xdj S3IEJSLaNI 3Id93U00U Ild 0£:Z0 nHu. 300a-II-add IX BLASTING MATERIAL OVERBURDEN ROCK COAL OTHER No.of blasts per day No. of blasts per year Hours of blasting days per year Proposed controls: Is Sequential blasting used: Dyes DNo (check one) V. RAW MATERIALS A. REMOVAL MATERIAL ROCK COAL OTHER Tons removed per year 1,500,000 Maximum tons removed per day 6,000 Equipment used for removal: Scrapers.front- end loaders Equipment capacity(in tons) 35 tons, 10.5 tons Estimated hours per yen required for removal 2,500 Is material dry,moist,or wet? moist Specit,moisture content if known(%) 4%-8% B. LOADING IN TO RAW MATERIAL STOCKPILE Method of loading in(tuck Bolton dump,front-end loader,etc.) conveyor Loading schedule 600 tons/hour 10 hours/day 250 days/year Proposed controls for loading to stockpile:-moist material Controls include: no control,water sprays,total enclosure,partial enclosure.chemical suppressants. reduced drop height,telescoping chute,other(specify): C. RAW MATERIALS_STOCKPILE 1 I 4 £1 'd 6(29911.20£ 'ON Xdd SSIEISfIMN1 3.1M0R OOld lid 0£20 (TILL 3002-II-Bdli MATERIAL ROCK COAL SANb a,GRAVEL Maximum tons stored at any one time 30,000 Length of time pile remains undisturbed 12 hours Proposed controls for raw material stockpile:(check appropriate boxes) ❑ Watering _times/day,or continuous sprinkler. ❑ Chemical stabilizer. (Type: - -) ❑ Compacting of piles,method: ❑ Enclosures: complete,or partial(check one) GI Other(specify) MOISTNATERIAL ❑ No control D. LOADING OUT FROM RAW MATERIAL STOCKPILE: Method of loading out(from-end loader,conveyor,etc.)-conveyor Loading schedule: 600 tons/hour 10 hours/day 250 days/year Proposed controls for loading to stockpile: Controls include: no control,water sprays,total exposure,partial exposure, moist material,other (specify): MOIST 4ATl3RIAL y(, PROCESSING Will processing(Lc,crushing,screening,etc.)occur on site? X YES NO (check one) NOTE: ALL PROCESS EQUIPMENT REQUIRES A separate PERMIT APPLICATION AND APEN (separate FORM IS ATTACHED AT END OF THIS FORM-MAKE ADDITIONAL COPIES AS NEEDED). Material loaded into processing equipment by: Convey or XJOS Front end loader Other Controls for processing include. Moist or wet materials(specify moisture%if known),water spray bars,bag filters,other(specify),no control. If existing processing equipment will be relocated front another location complete the following sections. This equipment must already be permitted. LIST PROCESSING CONTROLS IN THE APPROPRIATE SPACES BELOW A. PRIMARY CRUSHING 5 6I 'd 66Z99ILE0E 'ON Xd3 S3I8J f0NI 3J.d931{00d Nd. l2:Z0 0HL Z00Z-II-SdU Maximum tons crushed pa year 0 tons. Maximum tons crushed per hour 0 tons. Hours of crushing per day 0 hours. Proposed controls(see above) n/a B. SCREENING/CLASSIFYING Maximum tons screened per year 1,500,000 tons. Maximum tons screened per hour 600 tons. Hours of screening per day 10 hours. Proposed controls(see above)- water spray bars,wet material C. SECONDARY CRUSHING—N/A Maximum tons crushed per year 375,000(25%) tons. Maximum tons crushed per hour 600 tons. Hours of crushing per day 10 hours. Proposed controls(see above)- D. RESCREENING/CLASSIFYING Maximum tons screened per year 750,000 tons. Maximum tons screened per hour 500 tons. Hours of screening per day 8-10 hours. Proposed controls(see above)- spray bars,moist material VJL cONVEYORKBANSFERPOIWT'S A. CONVEYORS Tons of material conveyed per year 1,500,000 tons. Tons of material conveyed per day 7,500 tons. Proposed controls- pist/wet material.martial enclosure Controls for conveyors include: Full enclosure,partial enclosure,no control,other(specify) ' (INDICATE ON A separate DIAGRAM HOW CONVEYOR SYSTEM IS SET UP), B. tRANSFER POINTS Number of transfer points—12 to 15 Proposed controls:Moist,Wet MateriaL Partial enclosure Controls for transfer points include: Fula enclosure,partial enclosure,water sprays,chemical suppressants,no controls,other(specify) 6 SI 'd 8829911£0£ 'ON Aid S3IHJ.SOONI 3J.U03800V lid. IE:ZO OHJ. Z00Z-II-Bdtl VIII, FINISHED PRODUCT A. LOADING INTO FINISHED PRODUCT STOCKPILE Method of loading in(front-end loader,conveyor,etc.)—front-end loader,conveyor If conveyor is used,what is maximum drop height?30 feet Loading schedule: 600 tons/hour 10 hours/day 250 days/year Proposed controls Controls for loading to stockpile include: Ski(specify),no control,water sprays,total enclosure, partial enclosure,chemical suppressants,reduced drop bight,telescoping chute—reduced droo height moist material B. FINISHED PRODUCT STOCKPILE Maximum tons stored at one time— 150,000 tons. Length of time pile remains undisturbed(weekends)—2 days Proposed controls: (check appropriate boxes) ii Watecing�+eeded; times/day,or continuous sprinkler(to maintain moist surface). Q Chemical stabilizer(applied according to manufacturer's specifications). ❑ Compacting of piles,method: ❑ Enclosures: complete,or partial (check one) ❑ Revegetation,(length of time till revegetation ) GI Other(specify) moist material ❑ No Control C. LOADING OUT FROM STOCKPILE FOR FINAL TRANSPORT Method of loading out(rent-aid loader,conveyor,etc.)4ffintsakigka If conveyor is used,what is maximum drop height? 20 Loading schedule—600 tons/hour 10 hours/day 250 days/year Proposed controls: Controls for loading out of stockpile include: Water injection,chemical dust suppressants,bag collectors,other(specify),not control,water sprays,total enclosure,partial enclosure,chemical ,.. suppressants,reduced drop height,telescoping chute. 7 91 'd 66Z99ILE0E 'ON Xdd S3INISNINI 325034199k1 lid IE:Z0 OHL 300Z-it-Hdi XL VEHICLICHAUL ROADS CONTROL OPTIONS FOR VEHICLE HAUL ROADS (DO NOT WRITE IN THIS SECTION) I. Watering(specify) times/day,to maintain moist surface. 2. Chemical stabilization (according to manufacturer's specification) Specify: a. Fregrem:y of application and b. Type of stabilizer(brand name,or composition) 3. Paving to be completed by: r 4. Gravel (LIST HAUL ROAD CONTROLS IN THE APPROPRIATE SPACES BELOW) A. TRANSPORT OF RAW MATERIALS FROM REMOVAL SITE TO STOCKPILE Distance(one way)—300 feet If stockpile is off site,give distance from removal site to mine entrance: Haul vehicle capacity:7 cy,from-end loader No.of wheels-4 Average vehicle speed: 30 w.p.h. Maximum vehicle speed: 30 m.p.h.(cannot exceed 30 m.p.h.) No.of trips payday: 850 Haul mad silt content(if known): 4.8(AP421 List controls for raw materials transport..(sea measures listed above) Proposed controls wateti g cn haul roads 8 I 'd 66Z99ILE0E 'OH NI S3I8JSf10NI 3.Id933OO lid IE:ZO OHJ. ZOOZ-II-Sdd • B. FINISHED PRODUCT TRANSPORT(ON SITE) 1. Haul Trucks CAPACITY EMPTY NO.OF NO. OF NO. OF TRIPS AVG.SPEED WEIGHT TRUCKS WHEELS PER/DAY ON SITE 1. 18 yds 35,0001bs 18 120 15 mph 2. 10 yds 25,000 lbs 10 130 15 mph 3. yds mph 4. yds mph •*• Final product transport may also include rail transport in the fixture. 2. Haul Road Information for Final Transport On site haul roads distance(one way) 1500. t Haul road silt content(if known) V. List controls for final transport(see control measures)— Proposed controls:watering as needed C. OTHER ROADS ON-SITE WHAT IS ROAD LENGTH OF ROAD? DISTANCE CONTROLS USED FOR? FROM TO (SEE PAGE 9) 1. Maintenance 2500 feet Plant to pit Watering as needed 2. 3. 9 81 'd 663991L208 '0N Rd S3IULLSfGNI 3Ld93I199(3 lid Z£,ZO flRL Z00Z-I1-8d8 ess X SITE DISTURBANCE Estimated total disturbed acreage subject to wind erosion maximum 40 acres. Proposed controls: G Restrict traffic to established roads where practicable G Minimize area of disturbance $ Revegetation ❑ Mulch D Watering ❑ Chemical stabilizers O Other O No control Comments: Mail completed form and$100.00 filing fee to: Colorado Department of Public Health&Environment APCD-SS-B1 4300 Cherry Creek Drive South Denver,CO 80222-1530 303-692-3150 10 61 'd 88Z291LE0E '0N XVI S3IN.L&1NiI 3L1UJ38OJd Nd ZE:ZG f1HJ. Z00Z-11-Nd8 CAMAS Inc Check Request Form Cate al Want %11)02 parrs twee moat S MMus Control Division w Cate Cu. �1'S4� 4300 Pollution �v South „ Cherry Denver,CO 80222-1530 OS riot l a444.44i rnii aed rendA177 AcesnitdDIF Yates'* CC TEJ Lick ik T Phan C....•!mei=* I GL Cate 1 I I Cue CIE _ 1 I ! • a0 I I 4rn ill • Please Give DEBORAHt° OZ 'd 66799ILE0£ 'ON AU SHI LLS(10NI 3L093HOOd Lid ZE:Z0 0HL 3002-II-Bdtl � i � 1 a-I 'l —Ig a � � Z CD n 1 I I F I:I i O } I• a. N g / !n In 0 ? i W v G• ! a' o W c t 17 if fa - c .sy 8 _t IL - n w E 81 S' Li 8 • le # I -! 1 $s CO V C�i 3 R .SM. S4 •Q O. 4 C1 Iag 6ill CO r4 A 4IE C . 1 u Q a E 13 'd 6839911.£0£ 'ON XVd S3IIISSn0NI 3LUD33`J08 lid 3£:30 11111 3003-II-MB APR-18-2002 THU 08:47 AN AGGREGATE INDUSTRIES FAX NO. 3037165299 P. 03 r-• Permit No. COG-500000 Paeiliry No. COG-500418 CDMG No. Pending Page 1 AUTHORI2ATTON TO DISCHARGE UNDER THE CDPS INDUSTRIAL GENERAL PERMIT FOR SAND AND GRAVEL MINING AND PROCESSING GENERAL PERMIT Category 07,Sub-category IA-General Permits,Sand and Gravel-Pmcau Water&Stornrwater Sic.code 1440 Sand and gravel mining washing crushing screening and stoekplling. Cunentfee 3132/year per CRS 25-8-502 This permit specifically authorize, Aggregate lndustrte-WCR,Inc Nonn Roche.Manager,Market Development 3605 South Teller Street Lakewood Co. 80235 (303)+985-1070 with the Ptah*contact of Thomas Maul 3605 South Teller Street Lakewood Ca 80235 (303)+985-1070 to dischargejrom faciliies identified as Milliken Sand and Gravel,located in the SW%of the NW%of Section 8 T4N,R66W, Weld County. as shown in figure l of the permit,from Discharge Points 001, 002,003.and 004. Disaierge Poises Description end treatment Estimated Plow Rate 00/.002.003, Discharge front the settling basin before A i•60 MOD and 004entering the South Platte River. 1 Max. w 20.0 MGD The discharges are to the South Platte River,Segment I tithe Lower South Platte River Sub-basin,South Plane River Barbs,found in the au:Mationr and Numeric Standards for South Platte River Basin(5 CCR 1002-38):last update effective June 30,2001. Segment I has been classified/sr thefollowing uses: Recreation, Class la:Aquatic Life,Class 2(Warm);Agriculture. Salinity(TDS)monitoring afar charge will art be regrind. Phosphorus monitoring of the discharge wilt net be required. Anadegradarion review den asap*to this permit. Water Use Protccsed At the time ojapplleatait,thepenniatsangled that they had developed andnrrpiemarted a Smrmwater Management Plan(SWMP)forthis factliity. As a condition of this permit,a copy of the SW,1(P muss be provided to the Division upon request. The pandas*ft encouraged to read the gsneralreaionalejor an undersuotow ofhow thispermit wasdevelo perm; what requirements exist In the :taed hi and read the t tote: permit,effluent oar and addressed in P ILA. raguinrmtatu arespetxRed in Para I.B,I.C.and l.D.; special notifcaaom repmbY,motts for SBluau vtolattonr are addmte�d in Puree U.A. All correspondence relative to this*My should reference the specific faafiry number, COO-S004I8. Laren Young February 12,2002 Effe re February 12,2082 Expires September 30,2002 This facility permit contains 35 pages. S AGGREGATE January 30,2002 thlDUSTe1ES CDPHE—WQCD AT2N: Chris Gates 4300 Cherry Creek Drive South Denver,CO 80222-1530 RE: Aggregate Industries—WCR,Inc. Milliken Site—New NPDES Permit Request Dear Chris, Enclosed please find an application for a Process Water and Stormwater Discharge Permit at our new Milh7ten Sand and Gravel Site. As you can=Jam am requesting four portable discharge points for this site. Should you have any questions or need additional information,please contact me at(303)716-5395. Thank you very much. truly, g.aUtafrt/ Deborah Fenaro Environmental Affairs Representative Enclosure CC: Norm Rosh:,Manager,Market Development,AI Mike Refer,VP,Administration and Public Affairs,Al Pat Ward,VP/GM,Materials Division,AI Aggregate Industries nwetan Rasta ter.. 3605 South Teller Street Lakewood.CO 8O235 Telephone 303-985.1070 An Equal Opportunity Employer ZO 'd 863291110E 'ON Xdd S3I8JSfl 11I 3L893H9913 Uri L3:30 OHL Z00Z-II-Belli naLPU ?KS l: :a: r.S 4U4 I3.JJSU wrar.r ^w•u .a.UU: ^ ' ►ORAGrCT MOULT PROCESS WATER AND ST0R WATER c ` ;TT • rats: v DISCHARGES ASSOCIATED WITH auasrenvm SAND AND WAVES PRODUCTION OPERATIONS (AND OTHER - NONMETALLIC MINERALS Tries EVId _ _ pAT EXCEPT FUEL) rTre r s h les pent_ or type Do mt sus m tampion tit foam before tail M Ins4actzat. New P�1{or Aenwal El If rms tol.existing pantie numbs CO i. Ns and Niudr. gris x ndu�trltS-Wine. Ca Rani Yam 11. lLAa4.ii .` Q Fedeai Tupaye on pmpbye$ate: T 11 r C.I}rb et • WS;AaronLat2wcOQ t CO €02.35 City.Sure an6 Zio Code: phooey,aamr:•303 ,985-10?0 Leal Covet(familitr with taGtvyrair)mLs Ay I Tidy OpAralhon3 MRnJ!er plan, sr:r 305o3 115-1070 Pu No.•• who es applying Sr Si pssmi? . O OwnaOpalQsr • 2. Name SAW LC •Mails Andress: 2.145 • yon ve.,Siric nom,.,, TietaveR city.Stitt and ZIP Code: tt� b 1 8o pane Number:' W t 10Q�� Z Z Fu Yo. r 3. Londonetthe beam 22434 rec. r1h51iway t&a -. SsAddwa'y �g.�� 0 $Q543 airy.7esae,mdzlp tear f hits ia4 —.---------- Coweriesie ----- Name at Star prllikm ri Legal 4W line IA W Lace(tweshiC. scram. Ira>. KM re Snsifm ?o .ssw�P • Lamas and Ltwibrulc- s. Spnessd fmdaatriel CIesettleatten(SIC}Coda!ter a:.a 6eiimr. (TACKS W m for.in seder of impoames. See Appedk A.} a) mob)- C 4 /1 5: Receiving Berea�1�c •,imp G). (If discharge is eta dint or sys sewn.Se SOS S same at to Mats= =tome'saws., wa 80 'd 6829911108 'ON Xdd S3IN S(IONI 3,113938O ud 82:20 flat 2003-II-HS ♦.an wI I . :JL r.1J. $VJ IJL'JJaV OY! /'�\..Y 'fli00b ... 02 25 00 pI 17:52 FAl' J')J 7S2039U t�rnt +\�Y r••-- b. Industrial Activity: Destibt the p:duty indunnal activities which tins pace on so(e.g..sand and gravel Imtimg.gypsum aimed.sand .mousy or mobs halt' earaste bath plats.etc.). lama a the seas of the faeiliry(active, m eat.bang washing, gravel crushin t � — • reclaimed.at.) yyl • . 7. Other environment permits: Dees this faeiiiry emrrand*have say other Mviro.mmtil paints.or is it subject to resala on.tinder either of the Mowing programs) imillommomosimmoommea Permit Nun I Yes No Moiled Par.Data Permit No. a.; Colorado Divide's of Neenah sadCooler/ t s (tests NLRD) _ T'_^'� S b.) Underground takcdes Control r! e.) Dredge or fill paeaak unties Section apt of du Chat st Warr Act(CwAM(Ar+m!Carne af�inoera) - "'"-ti 44 Imourea Canservteoe sad Recovery Act(RCM >( e.) CPS Seartavaar — - st 4h15gpilafieh • t) Colorado Stan Air paUans Ea anion * I , IHI I W p�c 5 .) Ghat 'Q.i YT,w -0 JJ��. )eO , ^ pgO_mcC ®cam hi lam-' itea to item 7.a). please Minds Colorado avian otMaeraa sad Gager abased Land aninbaeba India petit advnnr7 SSW S. Stoemvstet n.)rase water Da you discharge any )t of the folk proems gemersted automaton hom your foutry,wen wan? C,vfat o Product wash elan • SY C Ya Naleteatimerapdpoteeta wean grit°.Yes Tramped wand(a.t.•are) 1 ((1rr Yet wea Scrubber n(casters or classifiers)c NoifiYs )lake deniM(graua''st stir tine demo the at) If you menred YES to an of item goodoaa.metleue oa to hen 9. If you aaswertt yea se of then onions,Mittman,16 9. Landon asap: A lan>doa map designing teen*v'w-0.thebarge points sad aed.han as shall he sbeakted. The to shall be Arta a*w or 0 mama USGS gad oast er a tap of eimpa+ba sole. A aim mete shed be abort. ma map sari be ea paper l>r%r 11 kids W. She Skeet A legible seams akan et the site atlas aobmiad.thong anmememue a m's couggiesis seandiversion g is flow aSSe °S On I'S a 11 stamtplMeer. tee arum ll as.teeeaeaves son4 win dee musters hoed in IS. �, )neba. The oudaats shall be;atatlM m mrrasmoad 6O 'd 86399IL£0E 'ON Xdd S3IHIS00NI 3.W03800tl lid 83:30 0HL 2003-II-Hdd ____92,25/00 FRI 17:17 ?AI 303 7lSU1WU r:DFRE/NCD 4007 , IS. Oetfj is •For sash process warn sulftn,provide a!ascription af. ▪ en operators eoartihuan4 Wasowux rte the effluent fachmd;ag water associate1 with pro=mooting or wubllg,equip= washing•saner?walnut!,gfeuralwater, • the average 1cw contnbuow Sy sub operation: • as naate:u rooting by the wsste.usr,iadudiag m idendficadoo of say ebamial additives used. Use addamai pain as aeedad. • - emom000 Ot.'T?ALL WASTIWATfA SOUA� AVG FLOW,MD' TREAT+,EC DESIGN" MEW= NUMBER `.�. USED FLOW.MOD WATEAJ r 001 Wafde_ 4M&1) 3adin'►,'rrb�`r�t ,20 16 e�_ _002 roundwatc to M0 .t 'Zi an • k003 row►dwatr 6 •- ....,,„ s.7,.„„ 0.0 ,✓ to Mls� :.►M`r x .sjwgg5 ex 'Amt.:potty* as Toreitbk. sot ._ ---] I • 0:•100 •% ion pilaustd$y •'1(adiemet pea htdkue 1PPMXinlag veheea of tutor. 16. water quality at Aealydal Mut for the following paramenrs shall be SSW tot u sea.%on grab ample from each dhebtrie nix. If no roar is eurrmdY available for oill's's.so ndlate. AIksilai9'Maio! pH U.u.l Tod Dineh'd Solids(MVO COD OW9 Tod Suspeedad Smaa( WO Oil sod Orin(mein )S. No water m sealyse ss time nee Tba D(vbiae o¢7 nu aaelyes of at=ponsamertr a �� n hos bees •lewd. Acme duestiees Wbea du me istiv+rf.matinee '2CO G?Wbn is the momsmd Ws of Sr ads*hem whim the arpis: based In:ant IS eights& yew. • 90 'd 88Z99IL£02 'ON WA S3IELS0GNI 3LU03800tl lid 8Z:Z0 0NJ. ZOOZ-II-Bdu • sta*MWAV MANACEMIN1'?LAN • This bet applies to ell faaiMm. A Smrawsar Meagre=Plan;slam abed bs prei tired prior to applying[be:avenge under the general stmt.and the following unification signed. See the SWMP require:n* s in Appendix B. vi+111re .I=try under penalty of law that a amtplete Sawn Management Plan. in:emalia ee with Appendix H of 3u aggfiegijan.briar printed for air fatuity igaaed on _m-�etutpN d tY geraon or pasxu who manage the rym ats ,or these person,disecdy responsible for gathering the war 1IUQ .the pro to of My Imowledge and Wilt.se.am=and compfl. I am swan that there are sianilleanr penalties for falsely eestllylag the=pima of sale SWMP.;setading the posalbllly of tine and imprisonment.- • a O• Due Signed s� Permit eRCX. Jt �E1?i KW—MT tE EPT Tide Name(primed) :9. Signers of App1 eerhy vale penalty of law that(have pessally snrunsd and am familiar with the bakeshop Sense n this application and all taambraerp and that bssad on my inquiry of tans iiwWidnals;nutty responsible fat*Waft is ialotmatiat.I believe that ate ialatpntlaa is site. amuse and asaplee. I am acute that sera an significant psnalca for sabmaWtg false information. itcluding is ppsslbiliry of fine and tmpriwmtarot. Sipsgve of Owner D. Signet: • Tide of Tig Name(rated) • 90 'd 86Z99ILE0£ 'ON Xdd S3I&JS(IONI 3J.8932IOo Rd 6Z:ZO OHJ.. Z00Z-II-8d8 - N\1LL\ KEJJ k-,i } .-. L..4,• -- Y' ` �", ' i : .7.. . f • � _�._ ` -1t . s• v� — 1,5 • ^ , ' ^-'5,•J fail �; .�� !,, _ ` •� i f•Z ` /LLtrillCtY r ► c J `, J E •a t • 1 _i LC .�.../ ' VICINITY MAP 6 b 001151C 11,5en L,E NOT To �cx t: ?a TTS LEM. D FTGN: Lot ly of teamed d E int't Mater 1067-e-Q-RE Dec a roardod Ahoy a 1555 1a Deaf 1475 es Raddled Unbar 2=225 of 0* rapids of vi. weld Gamy GBrt ad asoordar st Wait pat of Is Wet Holt (WI/21 a • port of the latest 6Latr of the Kkar*a * aorta QNVI/a KQ/A) d * Stair tat(5), Toed* Far tat mat Rom Sloarah Wet.=God of the 3beth Prre pt* M.ridat 4a PAW,),.can" of Wens saw of C.atorao. Dead cheated poral of tad condos of be acre pods of lord meg It.222 App stns ar IaM 4W-) ad mink Aaaaa sore or teas f+/-1 era Aaaage of 205400 no or leas of 1.,..d .. . ,„.atl sal a duarbod* ay rittraf-vo* or �pa w damemerat a. el- rained �! 'n'b LO 'd 6639911.80E 'ON WA SHI81SIONI 31UORIODU lid OZ;ZO OH1 ZOOZ-II-Hdd Savage and Savage practical solutions for environmental problems 464 West Sumac Court 303 666-7372 telephone Louisville, Colorado 80027-2227 303 665-6808 facsimile Transmittal To: Terry McKee Company: U.S. Army Corps of Engineers, Omaha District, Denver Regulatory Office Address: 9307 S. Wadsworth Blvd. City, State, Zip: Littleton, CO 80128-6901 Phone: 303 979 4120 Via: Priority Mail From: Michael Savage Company: Savage and Savage, Inc. Project: Aggregate Industries Milliken Project USACE File # 200180243 .-� Phone: (303) 666-7372 Fax: (303) 665-6808 Date: May 1, 2002 10:29 AM Mountain Time Comments: Terry, enclosed is a request for authorization for a Nationwide 27 permit for the Aggregate Industries Milliken Project (USACE File 200180243). As a Preble's meadow jumping mouse was found on the project site, a mitigation plan for the mouse is attached to the permit request. A copy of this entire package is being forwarded under separate cover to Mr. Ari Coltman of the U.S. Fish and Wildlife Service, Colorado Field Office for review and comment. If you have any questions please call at your convenience. C: Ari Coltman, USFWS Kim Ogle, Weld County Planning / Norm Roach, Aggregate Industries-WCR Danna Ortiz, Rocky Mountain Consultants Weld County Planning Department GREELEY OFFICE MAY 3 2002 " t RECEIVED ant Aggregate Industries Milliken Project Weld County, Colorado USACE Nationwide Permit 27 Application USFWS Preble's Meadow Jumping Mouse Mitigation Plan F 'f' .Mrv _ r :,: t4a i• lam ." 5� + • • • • • Mf Q Prepared by: Savage and Savage,Inc. 464 West Sumac Court Louisville, Co 80027 (303) 666-7372 telephone (303)665-6808 fax -- May 2002 Savage and Savage practical solutions for environmental problems ... 464 West Sumac Court 303 666-7372 telephone Louisville,Colorado 80027-2227 303 665-6808 facsimile May 1, 2002 Terry McKee _ U.S. Army Corps of Engineers Denver Regulatory Office 9307 South Platte Canyon Road Littleton, Colorado 80128-6901 Re: Nationwide Permit 27 Submittal for the Aggregate Industries Milliken I/11 Project Weld County, Colorado—Corps File No. 200180243 Dear Mr. McKee: Savage and Savage is submitting this nationwide permit request on behalf of Aggregate Industries for the Milliken project in Weld County, Colorado. Proposed development of the Milliken property will include development of twelve mineral extraction cells on the site. The mineral extraction cells are located north and west of the South Platte River and a series of flood control levees. In concert with the mineral extraction areas, an elevated conveyor, rail siding, and processing area are proposed along Weld County Road 396 and the Union Pacific rail line bisecting the project site. None of the proposed mineral extraction will involve dredge or fill in waters of the United States. General NWP Project Description Aggregate Industries plans to undertake activities to restore waters of the United States and enhance degraded Preble's meadow jumping mouse habitat in a non-tidal riparian area along the Big Thompson River in the northwest area of the project site. This activity, while not specifically proposed under the development envisioned for the project or required under any permitting undertaken for the project site to date, would complement and be an integral part of the preservation, creation, and enhancement activities proposed within the Preble's meadow jumping mouse mitigation plan submitted to the U.S. Fish and Wildlife Service for this project. This activity would be undertaken prior to project site development and serve as "up-front" mitigation for the mouse as well as restoration and rehabilitation of a degraded area along the Big Thompson River. The activities envisioned and proposed fall within the allowed activities covered by nationwide permit 27. In accordance with General Condition 13, the activities proposed to be undertaken will not adversely affect fish and wildlife resources or the harvest thereof, therefore no remedial measures will be required. The activities proposed are designed to have the net effect of improving approximately 950 linear feet of bank along the Big Thompson River and approximately 10 acres of adjacent riparian habitat. Terry McKee Nationwide Permit 27 Submittal—Milliken Project Page 2 Project Site .. The Milliken project site comprises approximately 497 acres located east of Colorado Highway 66 and south and east of Two Rivers Parkway along both sides of Weld County Road 396. The South Platte River forms the property boundary along the majority of the south and east sides. The Big Thompson River traverses the northwest corner of the site. The site is located within the SW'/< of Section 4, SE'/.SE'/, of Section 5, the W'h and NW''ANE'/ of Section 8, and the NE'/<NEY of Section 9, all in Township 4 North, Range 66 West, 6th Prime Meridian, in Weld County, Colorado. The U.S.G.S. 7.5-minute quadrangle "Milliken" contains the site. The latitude and longitude of the center of the site are 40°19'57" North and 104°47'55" West. Currently, the property has several land uses; residential, grazing, agriculture (row crops and hay), and oil and gas production. Adjacent land uses are the same as those found on the property. Average elevation of the site is 4690 feet above MSL. The property is accessed from Two Rivers Parkway and Weld County Road 396. The project site is depicted on the attached general location map. Project Elements Currently, the Big Thompson River and adjacent riparian area in the northwest corner of the Milliken Project site has been significantly degraded from overgrazing and historic erosion control activities. The south bank of the river has been armored with concrete and other materials to reduce erosion. The riparian area has been heavily grazed, reducing the biological diversity of the vegetation community and value of the wildlife habitat. To rehabilitate and restore the banks of the Big Thompson River and the adjacent riparian corridor the following activities are proposed (see Big Thompson River Restoration Area Map). Bank Repair and Stabilization In the locations where armoring has taken place along the banks of the Big Thompson River, the proponent proposes to remove all unsuitable armor material (including but not limited to tires, asphalt, metal, and organic material). Suitable armor material (including but not limited to concrete and durable rock) will be excavated and temporarily stored. After excavation of unsuitable material, the suitable material will be replaced along the banks at a level that allows placement of suitable plant growth material to a depth of at least one foot over the suitable armor material. The shape of the bank will be designed to approximate the natural condition of the banks upstream and downstream. Suitable subsoil and topsoil will be replaced over the armor to provide a medium for plant growth. This material will be that removed during excavation or salvaged from the adjacent riparian area. Terry McKee Nationwide Permit 27 Submittal—Milliken Project Page 3 Revegetation The banks of the Big Thompson River and the adjacent riparian area will be revegetated through seeding and planting of native vegetation. Prior to seeding or planting, the areas may be disked or harrowed to remove unwanted vegetation and loosen the soil. Two seed mixes (Tables 1 and 2) will be employed in seeding the banks and the riparian area. The mesic area seed mix will be seeded into the riparian area while the waters edge seed mix will be seeded along the Big Thompson banks (within ten feet of the waters edge). Seeded areas will be mulched with weed and pest free hay or straw or a wood fiber product. Currently, no understory exists along the banks or within the riparian corridor along the Big Thompson River. To facilitate development of a shrub understory valuable to wildlife, two types of plantings are proposed. First, along the banks of the Big Thompson River, coyote willow (Salix exigua) stakes will be planted to promote cover and erosion protection. Second, within the riparian corridor, shrub clumps and individual trees will be planted to provide wildlife cover and forage. Table 3 identifies the native species — proposed for planting in the riparian corridor. Maintenance As these activities represent a significant investment, the area will be protected and _ maintained during vegetation establishment. The area will be fenced to manage access, and grazing and weed control will be allowed only under the conditions identified in the Preble's meadow jumping mouse mitigation plan. Monitoring will be undertaken as described in that plan as well. If you have any questions concerning this nationwide permit application submittal, or require additional information please contact us. Sincerely, Michael S. Savage Vice President attachments: Project Site Map Big Thompson River Restoration Area Map Tables 1-3 — Preble's Meadow Jumping Mouse Mitigation Plan c: Norm Roach, Aggregate Industries Danny Ortiz, Rocky Mountain Consultants \\I TNIF.,Y\i/ -----\C .\) 1 :,) \,..t,i1:1—`---_c__-->1 , }-7-----.:4,011-4.168 \"\LIPit i; ' I I ))\NN t, (, I A I I � 1� �j.�,r- % of I 1 ,� \\\,y c."),), 0 - 7 " <-7 ,. , :0 t / alo �Jl \ li D --ilnea re I - — v t. be 4]09 1.11 b /- ,..--''''‘ / / i fir M 04, 1 44 —J a - 'ass .. '�� ll) O 1 V/ O 1 ... ., __ _-- a..__. ww r '� 18 ' ?� 17 16 .,,p/ •'7-_ ,�'�-:_-\/ Milliken Project Site General Location Map f 256 . 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PROJECT AREA 3.1 Topography and Geomorphic Features 2. 3.2 Soils 2. 3.3 Vegetation Communities 3. 3.4 Wildlife 5. 4.0 DESCRIPTION OF THE AFFECTED ENVIRONMENT: 5. PREBLE'S MEADOW JUMPING MOUSE 5.0 PREBLE'S MEADOW JUMPING MOUSE: 6. MITIGATION PLAN 5.1 Timing 6. 5.2 Mitigation Plan Elements 7. 5.2.1 Preservation Measures 7. 5.2.2 Creation Measures 7. 5.2.2.1 Vegetation Planting and Seeding 8. 5.2.2.1.1 Vegetation Seeding 8. 5.2.2.1.2 Tree and Shrub Planting 9. 5.2.2.2 Big Thompson Riparian Corridor Restoration 10. 5.2.3 Enhancement of Potential Mouse Habitat 11. 5.2.3.1 Grazing Plan 11. 5.2.3.2 Weed Control 12. 5.3 Monitoring and Mitigation Plan Success 13. 5.3.1 Vegetation Cover 13. 5.3.2 Planting Survival 13. 5.3.3 Monitoring Report 14. 5.4 Additional Conditions 14. TABLES AND FIGURES TABLES 1. Mesic Areas Seed Mix 2. Waters Edge Seed Mix 3. Wet Meadow Seed Mix 4. Tree and Shrub Planting List FIGURES 1. U.S. Fish& Wildlife Service Milliken Resource Mining Plan(sheet 1 of 4) 2. U.S. Fish& Wildlife Service Milliken Resource Mining Plan(sheet 2 of 4) 3. U.S. Fish& Wildlife Service Milliken Resource Mouse Mitigation Plan (sheet 3 of 4) 4. U.S. Fish& Wildlife Service Milliken Resource Mouse Mitigation Plan (sheet 4 of 4) 1.0 INTRODUCTION Aggregate Industries proposes to conduct mineral extraction operations at the Milliken site located east of Milliken in Weld County, Colorado. During a trapping survey in June 2001, one Preble's meadow jumping mouse individual was trapped adjacent to the South Platte River. The U.S. Fish and Wildlife Service concluded that the area likely contained a population of Preble's meadow jumping mice. As a result, this mitigation plan has been prepared to preserve, create, and enhance potential mouse habitat within the project site. '- This plan complements the reclamation plan approved by the Colorado Division of Minerals and Geology, and is being developed in conjunction with a nationwide permit from the U.S. Army Corps of Engineers to restore a segment of the Big Thompson River within the project site. 2.0 PROJECT DESCRIPTION The Milliken project site comprises approximately 497 acres located east of Colorado Highway 66 and south and east of Two Rivers Parkway along both sides of Weld County Road 396. The South Platte River forms the property boundary along the majority of the south and east sides. The Big Thompson River traverses the northwest corner of the site. The site is located within the SW'/. of Section 4, SE'/SE'/< of Section 5, the WV2 and NW'/NE''A of Section 8, and the NE'/NE''A of Section 9, all in Township 4 North, Range 66 West, 6th Prime Meridian, in Weld County, Colorado. The U.S.G.S. 7.5-minute — quadrangle "Milliken" contains the site. The latitude and longitude of the center of the site are 40°19'57" North and 104°47'55" West. Currently, the property has several land uses; residential, grazing, agriculture (row crops and hay), and oil and gas production. Adjacent land uses are the same as those found on the property. Average elevation of the site is 4690 feet above MSL. The property is accessed from Two Rivers Parkway and Weld County Road 396. Disturbance of the Milliken property will include development of twelve mineral extraction cells on the site (Milliken Resource Mining Plan, sheets 1 of 4, 2 of 4). The mineral extraction cells are located north and west of the South Platte River and a series of flood control levees. All of the cells will be disturbing lands that are presently used for agriculture or grazing with the exception of cell three. A portion of cell three is located within the riparian corridor and accounts for 1.5 acres of riparian woodland. In concert with the mineral extraction areas, an elevated conveyor, rail siding, and processing area are proposed along Weld County Road 396 and the Union Pacific rail line bisecting the project site. 3.0 DESCRIPTION OF THE AFFECTED ENVIRONMENT: PROJECT AREA The project site is located on agricultural and grazing land between the South Platte River and the Big Thompson River. The project site has been historically occupied for farming irrigated row crops, livestock grazing, oil and gas extraction, and transportation. Significant alteration to the site has occurred with these land uses. The South Platte -1- cottonwood riparian woodland is the only predominantly native vegetation community remaining. 3.1 Topography and Geomorphic Features The project site is situated between the South Platte River drainage and the Big Thompson River that are an average of 0.75 miles apart in the area. The Big Thompson River flows from west to east across the northwest corner of the site. The South Platte River forms the south and east boundaries of the site. The most significant natural topographic features of the site are the terraces and relict topography associated with both the South Platte River and the Big Thompson River. The site historically contained the combined floodplains of the Big Thompson and South Platte Rivers. The predominant topography of the site is flat with a gentle slope to the east toward the South Platte River. Significant human alteration to the topography of the site has occurred. Currently, an elevated rail line traverses the center of the site, running from southwest to northeast, crossing the South Platte River on an elevated trestle near the center of the east boundary of the site. A system of levees has been constructed throughout the site, generally paralleling the South Platte River from southwest to northeast. The levees function to isolate the agricultural fields from floods and high flows of the South Platte River. The levees range from ten to twenty feet in height and in some locations there are two or more individual levees between the agricultural fields and the South Platte River. The levee system has significantly impacted surface water flow within the site, such that the natural channels associated with the South Platte River floodplain are largely isolated. Surface water now flows from the irrigated fields downgradient along the levees (and the rail line embankment) and is trapped behind the levees in topographic low areas. The levee system largely divides the site into a riparian corridor along the South Platte River side of the levees, and irrigated agricultural fields to the north and west of the levees. In addition to the levee system, a number of irrigation supply canals and ditches have been constructed throughout the site. These structures do not follow historic natural channels and were dry during the field investigations in 2001 and 2002. 3.2 Soils — Soils within the Milliken site are representative of their genesis and topographic position. The Natural Resource Conservation Service Soil Survey of Weld County Colorado: Southern Part (1980) identifies five map units within the project site. The alluvial terrace between the levee and the South Platte River contains Bankard sandy loam soils. Bankard soils develop in flood plains of stratified recent alluvium along stream and rivers. They are deep, somewhat excessively drained soils. Commonly these soils have a brown sandy loam surface layer about four inches thick which is underlain n -2- by brown calcareous sand with lenses of sandy loam, loam, and fine gravel to five feet. Bankard soils are not listed as hydric by the U.S. Army Corps of Engineers. Aquolls and aquents are located northwest of the Bankard sandy loam and are comprised of a gravelly substratum. Aquolls and aquents develop along bottomlands and flood '— plains of major streams. They are deep, poorly drained soils formed in recent alluvium. Commonly the soils have a loamy or clayey surface layer and are underlain by sand and gravel within 48 inches. The differences between these soils are found in the color of their surface layers. Aquoll and aquent soils are defined as hydric by the U.S. Army Corps of Engineers. The agricultural field immediately east of Highway 60 and south of the mil line contains the soil map unit, Altvan loam. Altvan soils are deep well-drained soils formed in old alluvial terraces. The surface layer is typically a grayish brown loam ten inches in thickness. The subsurface layers are comprised of brown clay loam and sandy clay loam overlying a calcareous loamy sand. Gravelly sand is usually encountered at thirty inches below the surface. The U.S. Army Corps of Engineers does not list Altvan soils as hydric. The Dacono clay loam series found on the project site includes the remaining agricultural fields to the north of the aquolls and aquents and south of the rail line. These soils comprise the Dacono clay loam series. Dacono clay loam is a deep, well-drained soil formed on terraces. Typically, the surface layer is grayish brown clay loam about 12 _ inches thick. The underlying material is grayish brown clay loam about 15 inches thick. Dacono clay loam soils are not listed as hydric by the U.S. Army Corps of Engineers. Colombo clay loam forms an arm extending from the South Platte River to the north- _ northeast through the site to the Big Thompson River. Colombo clay loam is a deep, well-drained soil formed on floodplains and terraces. Typically, the surface layer is dark grayish brown clay loam about 14 inches thick. The underlying material to a depth of 60 inches is pale brown clay loam and loam stratified with thin lenses of fine sand, medium sand, and loam. This soil type is not identified as hydric by the USACE. 3.3 Vegetation Communities The significant natural vegetation communities providing wildlife habitat within the project site can be broadly categorized as cottonwood riparian woodland, wet meadows, swales, pastures, and agricultural plantings. Small inclusions of prairie cordgrass/tule swale and cattail vegetation communities are found locally within the site as well. The communities form a mosaic within the property and intergrade together depending on microtopography, soils, and the ambient hydrologic regime. Each community is briefly described below. Cottonwood riparian woodland vegetation is found in the area between the levees and the South Platte River and immediately adjacent to the Big Thompson River. While the segment of this community adjacent to the South Platte River remains in fair to good condition, the community along the Big Thompson River has been significantly degraded -3- by livestock grazing. This community is dominated by an open canopy comprised of plains cottonwoods (Populus deltoides). Subdominant tree species include green ash (Fraxinus pennsylvanica), boxelder (Acer negundo), Russian olive (Elaeagnus angustifolia), and peach-leaved willow (Salix amygdaloides). Grasses and forbs dominate the understory of this community. Dominant grass species include smooth brome (Bromus inermis), Kentucky bluegrass (Pos pratensis), and inland saltgrass (Distichlis spicata). Wild licorice (Glycyrrhiza lepidota), lambsquarters (Chenopodium album) and cow parsnip (Heracleum lanatum) are the dominant forb species. Occasional — patches of the shrubs coyote willow (Salix exigua), wild rose (Rosa arkansana), and snowberry(Symphoricarpos occidentalis) are encountered. Wet meadow vegetation communities are found throughout the site where irrigation tailwater or surface water drainage flows or accumulates during the growing season. This community is found predominantly north of the levees adjacent to the agricultural fields with another notable component south of the rail line embankment. The dominant plant species within these low areas consist of tule (Scirpus acutus) and algae. The areas immediately above the standing water are dominated by spikerush(Eleocharis palustris), curly dock (Rumex crispus), and an unknown hydrophytic grass. The margin between the wetland area and the uplands is dominated by inland saltgrass (Distichlis spicata). The upland islands within the wet meadow consist of mesic grasses such as Kentucky bluegrass (Poa pratensis) and smooth brome (Bromus inermis). This vegetation community is heavily grazed with a resulting decrease in the diversity of the plant species found in this community. Swale vegetation communities are found in localized areas within the site. Prairie cordgrass/tule swale vegetation communities are found in depressions formed by historic alluvial deposition as well as anthropogenic depressions associated with agriculture. The dominant species may vary between distinct areas and include prairie cordgrass (Spartina pectinata), tule (Schoenoplectus acutus), cottongrass (Eriophorum angustifolium), curly dock, reed canarygrass (Phalaris arundinacea), and three-square (Scirpus americanus). Pasture vegetation communities are located throughout the project site and are anthropogenic in origin. These areas are dominated by a mix of introduced pasture grasses (Kentucky bluegrass, smooth brome, and wheatgrasses) and the native inland saltgrass. These areas are grazed or hayed and provide little cover for wildlife. Irrigation conveyance ditches adjacent to these fields provide dispersion and travel corridors for wildlife. Agricultural vegetation communities are found throughout the project site and this season were dominated by corn. While growing, the corn provides cover for many small vertebrates, and after harvest the fields remain in stubble, providing food and cover for Canada geese and other wildlife. -4- 3.4 Wildlife The majority of wildlife species observed during on-site investigations in 2001 and 2002 were found within the plains cottonwood riparian corridor. During our wildlife assessments and bald eagle roost survey we encountered a number of avian species. Canada geese (Branca canadensis) were sighted flying over the area, afloat on the South Platte River, and foraging in the fields. Flocks of red-winged blackbirds (Agelaius phoeniceus) were flying and roosting within the riparian woodland. Other identified bird species included blue jay (Cyanocitta cristata), woodpecker (Picoides sp.), red-shafted flicker (Colaptes auratus), mourning dove (Zenaida macroura), field sparrow (Spizella pusilla), mountain chickadee (Parus gambeli), western meadowlark (Sturnella neglecta), hairy woodpecker (Dendrocopos villosus), robin (Turdus migratorius), mountain chickadee (Parus gambeli), field sparrow (Spizella pusilla), and slate-colored junco (Junco hyemalis). Red-tailed hawks (Buteojamaicensis) were commonly observed over — the site as were bald eagles (Haliaeetus leucocephalus) during the winter months when they are migrant residents. Mallards (Anas platyrhynchos) and American mergansers (Mergus merganser) were seen loafing and preening on a South Platte River sandbar. Great homed owls (Bubo virginianus) and American kestrels (Falco sparverius) were observed within the riparian woodland. Birds were usually feeding, loafing, or flying between sites. None were observed nesting at the times of our investigations. No avian species were identified along the Big Thompson River riparian corridor. Raccoon (Procyon lotor) tracks and pocket gopher (Geomys bursarius) mounds were — present throughout the South Platte River riparian corridor. A coyote(Canis latrans) was sighted chasing three white-tailed deer (Odocoileus virginianus). An active coyote den was identified along the levee. Fox squirrel (Sciurus niger) nests were identified in a number of cottonwood trees. Beaver (Castor canadensis) sign and cuttings were present on the site. No animals or animal sign was identified along the Big Thompson River riparian corridor. A Preble's meadow jumping mouse trapping survey was conducted June 6-8, 2001 at the Milliken site. Three species of rodents were captured during the trapping survey; house mice (Mus musculus), deer mice (Peromyscus maniculatus), and one Preble's meadow jumping mouse (Zapus hudsonius preblei). 4.0 DESCRIPTION OF THE AFFECTED ENVIRONMENT: PREBLE'S MEADOW JUMPING MOUSE The Preble's meadow jumping mouse (hereinafter, mouse), a federally listed threatened species was trapped along the South Platte River immediately north of the railroad trestle that crosses the river. The plant community north of the railroad trestle where the mouse was trapped is located adjacent to the outflow from the levee waterway that flows to the South Platte River. This area is along the border of the disturbed area of the railroad .— trestle and the cottonwood riparian woodland. -5- The area where the Preble's was trapped contains a mature overstory consisting of plains cottonwoods (Populus deltoides) and boxelder (Acer negundo) with a scattered shrub understory of coyote willow (Salix exigua). The herbaceous layer was well developed and dominated by reed canarygrass (Phalaris arundinacea), cattail (Typha latifolia), cheatgrass (Bromus tectorum), timothy (Phleum pratense), and quackgrass (Agropyron repens). Dominant forb species included leafy spurge (Euphorbia esula), curly dock (Rumex crispus), cow parsnip (Heracleum sphondylium), tuber starwort (Stellaria jamesiana), and mustard (Brassica rapa). 5.0 PREBLE'S MEADOW JUMPING MOUSE: MITIGATION PLAN The focus of the Preble's meadow jumping mouse mitigation plan for the Milliken project is three part;the preservation of the South Platte riparian corridor and cottonwood woodland, creation of mouse and ancillary wildlife habitat and dispersion corridors along the Big Thompson River and within and adjacent to the reclaimed ponds within the project area, and enhancement of the cottonwood woodland and ecotonal communities along the South Platte River and mining areas. The ultimate goal of the mitigation plan is to create and maintain mouse and wildlife dispersal corridors connecting the project area and the South Platte and Big Thompson River drainages and create varied mouse and ancillary wildlife habitat throughout the project area. 5.1 Timing The mitigation plan contains elements to be implemented prior to, during, and after construction activities. Prior to mineral extraction, mouse habitat creation will occur along the Big Thompson River corridor at the northwest corner of the project area. Weed control efforts and grazing management within the riparian corridors will take place prior to mineral extraction. During the project, reclamation within and adjacent to the cells will occur contemporaneously. Development and extraction within cell one will occur first in the mining sequence. Waste fines from aggregate processing will be deposited along the west side of the cell and will be reclaimed to wet meadow, seven acres in size. Development of cell two (2) has been scheduled early in the overall project life to allow creation of a wetland bench within the cell after mineral extraction, providing mouse habitat and a dispersal corridor and buffer between operational areas. Excavation at area 8b will occur midway through the project's life with contemporaneous reclamation to a wet meadow (3 acres) immediately adjacent to the South Platte River riparian corridor. With contemporaneous reclamation of each cell after mineral extraction, development of — reclamation vegetation communities will be staggered, providing variable age communities for wildlife. At the completion of the project, additional fmal reclamation and mitigation will be undertaken to ensure the self-sustaining nature of the mouse and wildlife habitat adjacent to the reclaimed cells and dispersal corridors within the project area. -6- 5.2 Mitigation Plan Elements '- The measures to be undertaken under the mitigation plan are further described under the auspices of their nature; preservation, creation, and enhancement. As the activities are intended to complement each other, and link habitat within the project area to habitat outside and adjacent to the project area, the measures will overlap in function. While the South Platte riparian corridor is proposed for preservation under this mitigation plan, the weed control and grazing management measures proposed will also serve to enhance the existing riparian corridor. Planting of plains cottonwood trees along the South Platte River east and north of cell four (4) will create and expand riparian woodland habitat (Milliken Resource Mouse Mitigation Plan, sheet 3 of 4). Active management of the mitigation plan area will continue during the period of revegetation establishment and until the proponent receives concurrence of the success of the mitigation measures from the U.S. Army Corps of Engineers and U.S. Fish and Wildlife Service. The reclaimed project area will remain as a natural area where direct man-made impacts to the area will be minimized. Retention of the project area as a natural area will occur through development restrictions placed on the deed or through a conservation easement to Weld County, the Town of Milliken, or a land conservation organization. Any future modification to the approved mitigation plan or mitigation area will be approved by the U.S. Fish and Wildlife Service prior to implementation. Costs for such modifications and any required permitting will be borne by the proponent of any modifications. 5.2.1 Preservation Measures With the exception of approximately 1.5 acres within extraction area three (at the southwest boundary of the project area), all development and mineral extraction will take place outside the South Platte riparian corridor on the project site. By thus restricting mineral extraction, a buffer zone between the South Platte River ranging from 200 to 1500 feet in width will remain in place. This area constitutes the extent of the cottonwood riparian woodland within the project site and the most valuable mouse and wildlife habitat present. Aggregate Industries does not propose any development or mineral extraction within this riparian corridor (with the noted exception above), and authorized mitigation activities will be restricted to those identified below under enhancement measures (weed control and grazing management). Access to the area will be restricted to authorized personnel undertaking mitigation activities or other authorized users (oil .- and gas users). 5.2.2 Creation Measures Creation of mouse habitat will comprise the most ambitious activity within the mitigation plan. Mouse habitat will be created along the Big Thompson River riparian corridor in an area that has been significantly degraded, within the project site along and adjacent to the ponds created as the significant feature of the post-mining land use, within the inter-pond spaces created during reclamation that will serve as major and minor dispersion corridors — -7- for the mouse and ancillary wildlife, and within the ponds themselves that will serve as habitat for wildlife. Habitat creation will employ the tenets of proven disturbed land reclamation, including backfilling and grading to a useful topography, retopsoiling, seeding and planting vegetation favorable to the mouse and wildlife in general, and maintenance of the reclamation until a self-sufficient, stable assemblage of vegetation communities is established. Description of the habitat creation measures for the project site follow under the vegetation planting and seeding heading. The measures for rehabilitation of the Big Thompson River riparian corridor are more extensive, and while employing the vegetation seeding measures described below, additional measures will be employed that — are described separately. 5.2.2.1 Vegetation Planting and Seeding Revegetation of the project site has been designed to reestablish and enhance three native predominantly graminoid vegetation communities adjacent to the South Platte River riparian woodland. One vegetation community will predominate in the inter-cell spaces within the project site and is characterized as a mesic grassland. The second vegetation community will be located along the margins of the cells and is characterized as a mix of hydrophytic graminoids and shrub clumps. The third vegetation community type will be reestablished in two cells (1 and 8b) and will be a graminoid wet meadow. While the _ three communities will be achieved predominantly through seeding, significant portions of the project site will have native shrubs and trees planted to reestablish and enhance both mouse and wildlife habitat. Trees will be planted along and adjacent to the South Platte River riparian corridor as well as along the margins of the established cells. The focus of the tree and shrub planting will be to establish wildlife dispersion corridors between the existing undisturbed areas adjacent to the project area and within the project area as well as areas of cover for wildlife foraging, loafing, and nesting. 5.2.2.1.1 Vegetation Seeding The reclamation plan for the project encompasses three distinctive topographic and hydrologic regimes, a mesic regime occurring between the mined cells, within former facilities areas, and adjacent to the Big Thompson River in the designated restoration area, a variable hydrophytic zone adjacent to the margins of the cells, within ten to twenty feet of the ambient water levels of the cells, and a hydrophytic regime to be created in two wet meadow wetlands. To effectively establish vegetation communities in these three areas, three separate seed mixes (Tables 1-3, Milliken Resource Mouse Mitigation Plan sheet 3 of 4) were developed with the following considerations in mind. A seed mix for the mesic areas required species adapted to predominantly sandy to loamy soils with moderate moisture requirements. The species selected were robust, either tall or bushy to provide wildlife cover and forage. A mix of warm and cool season species was developed to provide wildlife with cover and forage throughout the growing season. ., -8- Graminoids, forbs, and shrubs to be seeded provide a mix of plant morphologies and structures. The seed mix developed for those areas adjacent to the margins of the cells, within the phreatic zone, needed plant species tolerant of fluctuations in water availability. As with the mesic areas, species that provide good cover and forage were desirable, and species that were not overly aggressive were selected to maintain a diverse assemblage around the margins of the cells. Wet meadow communities are represented by plant species characteristic of near surface hydrologic regimes that remain saturated or moist for the majority of the growing season. A seed mix for this community needed species characteristic of wetlands, with deep fibrous root systems, an affmity for saturated soils (yet tolerant of seasonal drying) and _ low oxygen requirements. Hydrophytic grasses, sedges, and rushes were selected for this community. The species selected for the seed mix are available and native to Colorado. _ Seed mixes include representatives of both cool and warm season species where advisable to maximize cover and seed production throughout the summer months. Seeding rates proposed using drill seeding methods (broadcast methods will employ twice the rate) are sufficient to ensure placement of a minimum of 40 seeds per square foot, consistent with Natural Resource Conservation Service recommendations for reclamation of disturbed sites. Vegetation seeding will occur during the first normal planting season after completion of work within a specified area. Two seeding windows are proposed to facilitate revegetation, April 15-June 30 and September 1-November 15 of each year. 5.2.2.1.2 Tree and Shrub Planting As depicted on the attached plan(Milliken Resource Mouse Mitigation Plan, sheets 3 and 4), tree and shrub plantings are positioned within the project area to enhance dispersion corridors along the South Platte River riparian corridor, adjacent to the rail corridor running east-west, and between the South Platte River riparian corridor and the restoration area along the Big Thompson River (north-south). Additionally, shrub plantings along the margins of the ponds will provide cover and forage for the mouse and ancillary wildlife within the project area. Shrub clump locations have been selected to minimize inter-clump spacing, while forming a transitional vegetation community between the South Platte riparian corridor, the rail corridor, Weld County Road 396, and .- agricultural and pasture lands surrounding the project area. The shrub clumps have also been positioned to provide a degree of aesthetic screening of the project site. Size and shape of the shrub clumps has been developed based on the existing topography and a desire to enhance dispersion corridors and habitat adjacent to the ponds and South Platte and Big Thompson riparian corridors. To provide a varied structure and species composition to the shrub clumps, ten woody shrub species were selected for planting within the shrub clumps (Table 4). All species selected are native to Colorado, are found in the general vicinity of the project, and -9- represent species adapted to a wide variety of environmental conditions. These species are also commonly used in the revegetation of disturbed lands. The species selected are serviceberry (Amelanchier alnifolia), winterfat (Ceratoides lanata), red osier dogwood (Cornus stolonifera), chokecherry (Prunus virginiana), golden and wax currant (Ribes aureum and Ribes cereumi), skunkbush sumac (Rhus trilobata), Prairie rose (Rosa arkansana), coyote willow (Salix exigua), and snowberry (Symphoricarpos montanus). In general, serviceberry, winterfat, chokecherry, and skunkbush sumac will be selectively planted above the ponds and along slopes, in areas that are slightly drier or rockier. The — currants, prairie rose, and snowberry will be interspersed within shrub clumps and beneath planted trees throughout the project site. Red osier dogwood is proposed to be planted in small clumps under the shaded canopy of planted trees. Coyote willow stakes will be planted along the margins of selected ponds to develop cover along the waters edge and enhance transitional zones between upland mesic areas, pond areas, and dispersion corridors. To provide increased cover and structure within shrub clumps and tree plantings, an initial overall density of approximately one shrub every ten linear feet within the shrub clumps is proposed (450 stems/acre). Shrub plantings within clumps will not be evenly spaced, but semi-randomly, to achieve a more natural appearance. Planting density will also vary by shrub species, with fewer of the larger spreading shrubs (skunkbush, snowbeny) being planted compared to the more compact shrubs (currants, prairie rose). Several tree species (Table 4) are proposed for planting along the margins of the South Platte riparian corridor and in concert with the shrub clumps within the project site. As with the shrub species selected, the tree species are native to Colorado and the project area, are of proven value to wildlife, and have been successfully employed in revegetation. The tree species include boxelder (Acer negundo), western hawthorn (Crataegus succulenta), plains cottonwood (Populus deltoides), and peach leaf willow (Salix amygdaloides). As mature trees cannot be successfully or feasibly replanted, the replacement trees will be of a maximum three-inch caliper. In order to establish a more native tree overstory and community, the majority of the trees planted will be cottonwoods. The trees will be planted in clumps or in association with shrub clumps to maximize overstory near the ponds, provide screening of the project site, and maximize survival through proximity to groundwater. 5.2.2.2 Big Thompson Riparian Corridor Restoration The area along and adjacent to the Big Thompson River in the northwest area of the project site has been heavily grazed and subjected to flood and erosion control measures that have been detrimental to the historic vegetation community and wildlife habitat. Currently, the area has some plains cottonwood trees and a vegetation understory comprised of inland saltgrass and ruderal opportunistic species. Erosion control measures along the banks of the Big Thompson channel reveal large pieces of concrete, metal, and other riprap. There is no significant habitat for wildlife, the vegetation diversity is extremely low, as is productivity. As part of the mitigation plan, and in -10- conjunction with the U.S. Army Corps of Engineers, Aggregate Industries proposes to create significant mouse and ancillary wildlife habitat through the rehabilitation of this area. Rehabilitation will include removal of unsuitable material used for riprap along the river channel. Where concrete or rock suitable for use as armoring material is present, this material will be excavated and placed in a controlled manner adjacent to the channel. The armoring material will be covered with at least one foot of suitable plant growth — material from the area. The entire area will be reseeded to a combination of the appropriate seed mixes, the waters edge mix will be employed along the banks and channel edge and the mesic mix will be seeded in the area removed from the channel. Coyote willow stakes will be planted along the banks of the channel to promote habitat development and erosion control. Shrub clumps will be planted in a random pattern under the existing plains cottonwood trees to develop cover and mouse habitat. Plantings will occur so as to facilitate dispersion while directing wildlife away from Two Rivers Parkway. The area will be fenced to prevent access. Annual monitoring will evaluate the — progress of the rehabilitation as described under monitoring. Weed control will take place as described under enhancement measures. 5.23 Enhancement of Potential Mouse Habitat Within the project site the South Platte riparian corridor and pasture areas have been grazed by livestock. A review of the existing pasture areas and the riparian corridor indicated that the areas contained a mix of desirable and undesirable plant species from a wildlife habitat and diversity standpoint. With grazing management,the riparian corridor would develop into more desirable mouse habitat. As in many areas, noxious weeds were identified throughout the property. The second task of the enhancement measures addresses the control of the noxious weed species, with subsequent replacement by desirable vegetation of use to wildlife, including the mouse. 5.2.3.1 Grazing Plan Currently, the riparian corridor is grazed throughout the year by livestock. As part of the mitigation plan, livestock grazing is to be managed in the riparian areas. Grazing will only be allowed if the percentage of litter encountered during monitoring reaches 25 percent (actual) or 35 percent (relative to total vegetation cover). Grazing within the project site will serve as a management tool to reduce accumulated litter, stimulate granvnoid growth, and provide forage and cover for wildlife during and after the active growing season. The grazing plan will be conducted to compliment vegetation monitoring at the site within the project site. Grazing will be conducted to harvest current year plant growth equally throughout the area. Grazing will occur beginning September 15 and continue through November 15 subject to overall pasture health and restrictions. _. -11- Stocking rates were developed from range site descriptions within the soil survey of the Natural Resource Conservation Service. Stocking rates are based on the premise of �— "grazing half and leaving half' for regrowth. The mitigation area will not be grazed unless it is considered to be in good to excellent condition based on species composition and growth characteristics, during a normal precipitation year. The range site descriptions for the mitigation area are the gravelly foothill range site and the overflow range site, with each representing approximately half of the mitigation area. During favorable years the average dry weight of forage is 1500 pounds per acre, of which 1300 lbs/acre is available for large ungulate grazers. With forage requirements of approximately 900 lbs/month for a livestock unit, and horses requiring approximately 25 percent more forage than cattle, a calculated stocking rate would be 1.4 acres/animal unit month (AUM) for cattle and 1.7 acres/AUM for horses. With approximately 80 acres available for grazing, 30 head of cattle or 25 horses could be grazed per month sustainably. Regular inspections will determine pasture condition. The pasture inspections should ensure utilization of not more than 50 percent of the available live vegetation. The rancher should ensure movement of livestock to prevent overgrazing of any localized area in any pasture. This could include movement of water tanks, mineral blocks, or repositioning of fence during the grazing period. 5.2.3.2 Weed Control Invasive noxious weed species were identified within the project site. As part of the mouse enhancement measures, noxious weed species will be controlled and minimized within the project site. Weed species to be controlled are identified as those plant species identified by current state statute or regulation as noxious. The species are not listed here as the list of noxious species changes regularly. The presence of noxious weeds will be monitored semi-annually. Noxious weed species management measures will be undertaken where a single or combination of noxious weed species comprises more than ten (10) percent of the live vegetation cover in the mitigation area as determined by either quantitative monitoring or ocular estimation (Daubenmire quadrats). Further, where noxious weed species constitute more than 25 percent relative vegetation cover in an area of 500 square feet, such area will be identified as a patch, and subject to management measures, irrespective of the percentage of overall noxious weed cover in the mitigation area. Noxious weeds may be controlled by any combination of cultural, mechanical, biological or chemical measures. Weed control measures will be developed specifically for the noxious weed species encountered and in conjunction with the local weed control district and/or the Colorado State Department of Agriculture. Where noxious weed control measures cause disturbance to the remaining vegetation, seeding or planting of desirable replacement vegetation will occur during the first normal planting or seeding season after ^• weed control measures have been implemented. -12- 5.3 Monitoring and Mitigation Plan Success The success of planted and seeded vegetation will be monitored annually after initial planting and seeding. Monitoring will consist of qualitative and quantitative vegetation sampling techniques that measure the vegetation cover of the revegetated areas and the survival of planted vegetation stock. Bare areas larger than 500 square feet will be reseeded. Revegetation seeding will be considered successful when there is no evidence of surficial erosion related to the construction and the total live vegetation cover equals forty (40) percent. The revegetation success standard is derived from the amount of vegetation needed to minimize surface erosion and is equal to or greater than the existing vegetation cover within the project site. 5.3.1 Vegetation Cover Total live vegetation cover will be measured by accepted vegetation techniques, through intercept or ocular estimation. The intercept method for vegetation cover estimation is described below. If another method is employed, a protocol will be submitted to U.S. Fish and Wildlife for concurrence. Vegetation cover will be estimated by the use of the point-intercept method. An ocular point frame (ESCO Associates or other) will be used to minimize instrument error and maximize precision and observer accuracy. Cover transects will be 25 meters in length, _ _ with two sample data points collected at 1.0 meter intervals along the transect on opposite sides of the transect centerline, 1.5m apart. Transect direction will be established randomly through the use of computer generated random directions (0-360°). In no event — will transects be allowed to extend within ten feet of area boundaries to minimize impacts from"edge effect." For statistical purposes, each cover transect (comprising 50 data points) serves as a sample unit. Data points recorded the first vertical "hit" on vegetation (above or below the instrument), soil (bare ground), rock, litter, or cryptogamic crust. Subsequent "hits" on vegetation will be recorded. Cover data will be recorded and reported by individual plant species. The first interception is used to calculate total vegetation cover values. Additional interceptions are used to calculate relative cover of individual plant species and lifeforms. The quantitative cover data also provides the basis for calculation of species composition and relative importance. 5.3.2 Planting Survival Success of planted vegetation will be based on survival. An annual count of the planted vegetation will be conducted. If the total number of planted shrubs and trees is less than 80 percent of the total planted, additional shrubs or trees will be planted to return the numbers to a level above the 80 percent total. If a particular species is not successful in a given location, another approved species may be substituted. Ml replanting and reseeding will be undertaken between May 1 and November 15 of the year in which the -13- need for reseeding or replanting was observed in order to minimize disturbance to the area and inhabitants. 53.3 Monitoring Report A report will be prepared and submitted based on on-site observations and sampling that discusses the condition of the seeded and planted vegetation. The report will evaluate the success of the mitigation area vegetation. If the success criteria described above are not met after the third growing season after seeding or planting, the revegetation plan will be modified and re-implemented after concurrence by the U.S. Fish and Wildlife Service. The report will be submitted to the U.S. Fish and Wildlife Service by December 31 of each monitoring year. Monitoring will be discontinued when vegetation has been determined to be successfully established to the success criteria described above. 5.4 Additional Conditions All workers on-site will be informed by the proponent or authorized representative as to the reason for and importance of limiting disturbances and impacts to those identified areas outside any potential habitat. Mitigation work on-site will be supervised at all times by an authorized representative of the Owner's contractor. 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