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Home My WebLink About20110515.tiff r �1D 2400 West Union Avenue RE`,�,��.A `� 80110 Englewood,303-914-1445 Ph ne) WASTE MANAGEMENT 303-914-9937(Fax) FEB "i 0 201 ' February 7, 2011 Weld County [Miming L GREELEY OFFIL.; Ms. Marley Shoaf Air Pollution Control Division (APCD-SS-B1) Colorado Department of Public Health and Environment 4300 Cherry Creek Drive South Denver, CO 80246-1530 Certified Mail 7006 2150 0004 4548 9027 RE: ANNUAL NMOC EMISSION RATE REPORT NORTH WELD LANDFILL Dear Ms. Shoaf, As required under the State Emissions Guideline Program for municipal solid waste landfills, attached is the 2010 Annual NMOC Emission Rate Report for North Weld Landfill (NWLF) located at 40,000 County Road 25, Ault, Colorado. 40 CFR 60.754(a) provides two equations for determining NMOC emission rates. One equation is for sites with unknown (estimated) solid waste acceptance rates, which is what the site heretofore has used for calculating the emission rate at the facility. The other equation is for sites with known waste acceptance rates (e.g., tonnage-based sites). For sites that include time periods with both known and estimated acceptance rates, the Regulation indicates both equations should be used. The enclosed Emission Rate Report reflects this change resulting from the installation of scales at the site on February 1, 2010. Page 1 of the report provides the emission rate calculation based on the estimated waste volumes (for waste received prior to February 1, 2010), and Page 2 of the Report provides the emission rate calculation for tons received at the site (for waste received after February 1, 2010). As previously discussed with Dana Podell, this report reflects a new submittal schedule to occur based on the calendar year (i.e. from January 1 through December 31 of each year), to be submitted to CDPHE by February 15 of each year. Our last report dated December 17, 2010 covered the period of November 1, 2009 through October 31, 2010. This report includes the months of November and December 2010 to complete the reporting for 2010. Should you have any questions regarding the information contained in this report, please contact me at 303-914-1445. Sincerely, Tom chweitzer Engineering Manager Enclosure cc: Troy Swain, WCDPHE Kim Ogle, WCDPS Jerry Henderson, CDPHE Dana Podell, CDPHE Bill Hedberg, NWLF Bruce Clabaugh, Waste Management 2011-0515 CCittntcw 1 i tcja:C 3 d-a3- 7Ci I J 2010 Tier 2 NMOC Emission Rate Report North Weld Landfill Prior to scale installation on February 1,2010,volume of waste accepted was estimated based on container size of incoming waste. Therefore,because the actual year-to-year solid waste acceptance rate is estimated, the equation found in 40 CFR 60.754(a)(ii)was used to determine NMOC emission rates for this time period. MNMoc=2LoR(e"e-e'1)(CNMoc)(3.6 x 1('9) NMOC Emission Rate for Years with Estimated Waste Acceptance Rates MNMOC = Mass emission rate of NMOC,Mg/yr Lo = Refuse methane generation potential,m3/Mg = 170.00 2 R = Average annual acceptance rate,Mg/yr = 122,534.25 1 k = Methane generation rate constant, 1/yr = 0.02 3 c = Years since closure,yrs = 0.00 a (c=0 for active and/or new landfills) = Age of landfill,yrs = 17.99 CNMOC = Concentration of NMOC,ppm as hexane = 153.00 2 Conversion factor = 3.6 x 10.3 MNMoc=2(Lo)(R)(eiklle)•eib)(t))(Cnmoc)(3.6 x 10') = 6.93 Mg/yr 1 Information used to determine annual average acceptance rate The average annual acceptance rate(R)is determined by taking the total waste received between the approximate opening date of February 3, 1992 and January 31,2010 divided by the number of years for this period. Total tons received as of 01/31/10 4,584,717.63 Total tons converted to Mg5 4,159,228.55 Percent inert(including soil) 0.47 Total Mg less inert waste6 2,204,391.13 Age of site as of 01/31/10 17.99 Annual average acceptance rate(Mg/yr) 122,534.25 2 For regulatory purposes,the EPA default values for Lo and CNMoc must be used to calculate Tier 1 NMOC emission rates unless actual values have been obtained during Tier 2 sampling. NWLF conducted Tier 2 site specific sampling for CNMOC in 2008(using Method 25C)with a resulting concentration of 153 ppmV as hexane. 3 For landfills in areas with a thirty year annual average precipitation of less than 25 inches,a k value of 0.02 is to be used. Annual precipitation in the area of North Weld Landfill is about 13 inches,therefore a k value of 0.02 has been used in the NMOC emission rate calculation. a Gas generation from waste accepted after January 31,2010 is calculated with"Known Waste Acceptance Rate" NSPS equation. 6 Conversion Used:Tons to Mg-Divide tons by 1.1023 6 Inert material includes inert wastes that are disposed in the landfill as well as intermediate and final cover soil used as part of routine landfill cell development. NOTE: These calculations are made for N5P5 purposes only. EPA has specifically stated as follows:"It is recommended that these default values not be used for estimating landfill emissions for purposes other than NSPS and EG" (61 FR 9905,9912,March 12,1996). Consequently,these emission calculations grossly overestimate actual and potential emissions and reviewers of this document are specifically cautioned against improper and Inesonsible uses of these calculations. Page 1 of 2 NWLF NMOC Tier 2 Report 2010-Full Year.xls 2010 Tier 2 NMOC Emission Rate Report North Weld Landfill 40 CFR 60.754(a)provides two equations for determining NMOC emission rates;one for sites with known solid waste acceptance rates and another for sites with unknown(i.e.estimated)waste acceptance rates. For sites that include time periods with both known and unknown acceptance rates,the Regulation indicates that both equations should be used. North Weld Landfill is such a facility. Accordingly,this Emission Rate Report applies both equations for calculating the facility's 2010 Tier 2 NMOC emission rate. NMOC Emission Rate Calculations for Years with Known Waste Acceptance Rates The site installed scales on February 1,2010. Therefore,the equation found in 40 CFR 60.754(a)(1)(I)for known waste acceptance was used to determine NMOC emission rates for this time period. The equation is provided below: MNMOC=Summation of[2kLaMi(e"t;)(CNMoc)(3.6 x 10-9)]for each year with a known waste acceptance rate MNMOC = Mass emission rate of NMOC, Mg/yr k = Methane generation rate constant, 1/yr = 0.02 1 La = Refuse methane generation potential,m'/Mg = 170.00 2 M; = Mass of solid waste received for given year,Mg = Varies per year(see table below) ti = Age of the i n section,Years = current year minus year of waste placement CNMOC = Concentration of NMOC,ppm as hexane = 153.00 2 Conversion factor = 3.6 x 10-9 NMOC Emission Rate Calculation Summary(for years with known waste acceptance rates] Tons Tons Less Year Received Inert Waste3 M,' ti MNMOC 02/01-10/31/2010 578,668 306,704 278,240 0 1.04 11/01-12/31/2010 71,125 37,696 34,198 0 0.13 2011 2012 2013 Totals 649,813 344,401 312,438 1.17- Mglyr `Conversion Used: tons to Mg-divide tons by 1.1023 I For landfills in areas with a thirty year annual average precipitation of less than 25 inches,a k value of 0.02 is to be used. Annual precipitation in the area of North Weld Landfill is about 13 inches,therefore a k value of 0.02 has been used in the NMOC emission rate calculation. 2 For regulatory purposes,the EPA default values for Lo and CNMoc must be used to calculate Tier 1 NMOC • emission rates unless actual values have been obtained during Tier 2 sampling. NWLF conducted Tier 2 site specific sampling for CNMOC in 2008(using Method 25C)with a resulting concentration of 153 ppmV as hexane. 3 Inert material includes inert wastes that are disposed in the landfill as well as intermediate and final cover soil used as part of routine landfill cell development. 40 CFR 60.754(a)allows the mass of nondegradable material to be subtracted from the total mass of solid waste when calculating the value of M. NOTE: These calculations are made for NSPS purposes only. EPA has specifically stated as follows:"It is recommended that these default values not be used for estimating landfill emissions for purposes other than NSPS and EG" (61 FR 9905.9912,March 12,1996). Consequently,these emission calculations grossly overestimate actual and potential emissions and reviewers of this document are specifically cautioned against improper and irresponsible uses of these calculations. TOTAL NMOC EMISSION RATE: NMOC rate for years with known waste acceptance rates: 1.17 NMOC rate for years with estimated waste acceptance rates: 6.93 Combined NMOC Emission Rate: 8.10 Mg/yr Page 2 of 2 WV1m 2400 West Union Avenue Englewood, CO 80110 303-914-1445(Phone) WASTE MANAGEMENT 866-442-0285(Fax) RECEIVED MAR 2 3 2011 March 18, 2011 Weld County . Uepartmeni GREELEY OFFICE Mr. Jerry Henderson Colorado Department of Public Health and Environment Hazardous Materials and Waste Management Division HMWMD-SWIM-B2 4300 Cherry Creek Drive South Denver, CO 80246-1530 Mr. Troy Swain Weld County Department of Public Health and Environment 1555 N. 17th Avenue Greeley, CO 80631 SUBJECT: NORTH WELD LANDFILL FIRST QUARTER 2011 GAS MONITORING REPORT Dear Mr. Henderson and Mr. Swain: Enclosed for your information is the First Quarter 2011 Gas Monitoring Report for North Weld Landfill (NWLF). The report dated March 14, 2011 was prepared by AquAeTer and documents their field monitoring activities conducted on March 9, 2011. The gas monitoring report contains monitoring results from the Phase 1 and 2 perimeter soil gas probes GP-06, GP-07, GP-10 through GP-20, structure probes GP-01 and GP-02, inside the shop and office, and confined spaces in the vicinity of the western boundary of the site. A map showing the gas probe locations, the scale house and maintenance shop is included as Figure 1. Section 2.3.1 of the Regulations Pertaining to Solid Waste Sites and Facilities, 6 CCR 1007-2, Part 1 (Regulations) requires that the concentration of explosive gases shall not exceed (A) 25% of the lower explosive limit (LEL) (1% by volume in air for methane) within facility structures, and (B) the LEL (5% by volume in air for methane - i.e., percent methane) at the facility boundary. Combustible gas above regulatory limits was not detected in any of the probes, shop, office or confined spaces. Structure probe GP-01 registered the presence of combustible gas, but below regulatory limits, with a concentration of 3.9%. The facility is currently operating under an approved gas remediation plan prepared in response to elevated gas concentrations in structure probe GP-01 and perimeter probes GP-10 and GP-11. The plan includes monthly monitoring of these probes and utility corridor access points along WCR 25. Included in Attachment 1 are the January and February 2011 monthly reports. A summary of the test results for these monthly events is provided in the following table. Orinn<.,u„ > 3-ag-aOt I do) I - 0SI.S" ?LO111 Letter Jerry Henderson and Troy Swain January 11, 2011 Page 2 CH4 Concentration Monitoring Probe January 2011 February 2011 GP-01 5.8 0.0 GP-10 4.0 3.3 GP-11 0.0 0.0 Methane was not observed in the utility corridor access points or facility structures during the monthly monitoring. The approved remediation plan also included the installation of passive gas vents in waste along the western limit of the disposal area. As stated in the plan, the passive vents, which were installed in December 2009, may require one or more years to show consistent reduction in methane concentrations at perimeter probes GP-10 and GP-11 and structure probe GP-01. Until methane concentrations are below the regulatory threshold for three consecutive monthly events, monthly monitoring will continue to be performed. Continuous methane monitors are in operation within the facility maintenance building, office and gatehouse and no methane detections have been observed. If you have any questions regarding this report, please contact me at (303) 914-1445. Sincerely, On behalf of North Weld Landfill Tom Schweitzer Engineering Manager cc: Kim Ogle, WCDPS, w/o enc. Bill Hedberg, NWLF RECEIVED APR 1 2 ZU11 � a weld County Planning Uepartmenl 2400 COn Avenue 1 GREELEY OFFICE Englewood,C 80110 303-914-1445(Phone) WASTE MANAGEMENT 303-914-9937(Fax) April 7, 2011 Mr. Charles Johnson Colorado Department of Public Health and Environment Hazardous Materials and Waste Management Division 4300 Cherry Creek Drive South Denver, CO 80246-1530 Subject: North Weld Landfill (NWLF) Updated Closure and Post-Closure Plan and Financial Assurance Plan Dear Mr. Johnson: Enclosed are updated closure/post-closure and financial assurance plans which have been revised to reflect current operations at NWLF and anticipated closure and post-closure activities. Section 1.8.3 (C) of the Colorado Regulations Pertaining to Solid Waste Disposal Sites and Facilities, 6CCR-1007-2, requires an annual adjustment to the closure and post-closure financial assurance cost estimate by using the implicit price deflator (IPD) for the gross domestic product. The IDP for 2011 is 1.009 as confirmed with CDPHE. The closure and post- closure cost estimates respectively contained in Appendix A and Appendix B of the enclosed financial assurance plan were adjusted using this value. The insurance certificate contained in Appendix C of the financial assurance plan reflects this adjustment to the referenced cost estimates. The insurance certificate and updated plans have been placed in the facility operating record. Please call me at (303) 914-1445 if you have questions about the enclosures. Sincerely, T m Schweitzer, P.E. Engineering Manager Enclosures cc: Troy Swain, WCDPHE Kim Ogle, WCDPS Douglas Ikenberry, CDPHE Bill Hedberg/NWLF Operating Record Julie Overmyer, Waste Management of Colorado, w/o enclosure Donna Meals, Waste Management, w/o enclosure ap(�_osrs eg rnunah y PG o 77, C:\IJoc�nts and Settings\lschweit\My Documents\mydata\FinAssurance 1l\NWLF FinAssur TransLtr 2011.doc FINANCIAL ASSURANCE PLAN NORTH WELD LANDFILL Weld County, Colorado Prepared by: Waste Management Disposal Services of Colorado, Inc. North Weld Landfill 40,000 Weld County Road 25 Ault, Colorado Revised March 2011 FINANCIAL ASSURANCE PLAN NORTH WELD LANDFILL TABLE OF CONTENTS Section Page 1.0 INTRODUCTION 1 2.0 REGULATORY REQUIREMENTS 1 2.1 Cost Estimates 1 2.2 Financial Assurance Activities 1 2.3 Financial Assurance Mechanisms 2 3.0 CLOSURE AND POST-CLOSURE COSTS 2 4.0 FINANCIAL ASSURANCE MECHANISM 2 LIST OF APPENDICES Appendix A Closure Costs B Post-Closure Care Costs C Insurance Certificate for Closure and Post-Closure Care Costs Financial Assurance Plan i March 2011 North Weld Landfill FINANCIAL ASSURANCE PLAN NORTH WELD LANDFILL REVISION LOG DATE DESCRIPTION OF REVISION BY 4/99 Replaced letter of credit with insurance certificate. TS 3/01 Revise financial assurance costs based on the revised closure and post- TS/AS closure plan dated March 2001. 5/02 Replace original engineering cost estimates of closure and post-closure TS/AS based on 2002 CDPHE guidance or determined by NWSL 4/03 Revise financial assurance costs based on the revised closure and post- TS/AS closure plan dated April 2003. 3/05 Revise financial assurance costs based on the revised closure and post- TS/AS closure plan dated March 2005 3/06 Revised financial assurance costs based on the revised closure and post- TS/AS closure plan dated March 2006. 3/07 Replace cost estimates of closure and post-closure prepared in 2002 with TS/AS new cost estimates in accordance with Section 1.8.3 of the Solid Waste Regulations. Miscellaneous text changes were also made to the Plan. 3/09 Revised financial assurance costs based on the revised closure and post- TS/AS closure plan dated March 2009. 3/10 Revised financial assurance costs based on the revised closure and post- TS closure plan dated March 2010. 3/11 Revised financial assurance costs based on the revised closure and post- TS closure plan dated March 2011. Financial Assurance Plan ii March 2011 North Weld Landfill 1.0 INTRODUCTION This revised Financial Assurance Plan (Plan) has been prepared in accordance with Section 1.8 of the Regulations Pertaining to Solid Waste Disposal Sites and Facilities, 6 CCR 1007-2, (Regulations), and sets forth the closure and post-closure care costs for North Weld Landfill (NWLF) in Ault, Colorado. This Plan includes, in Appendices A and B, closure and post-closure cost estimates which are updated from 2010. The Regulations require that cost estimates be replaced every five (5) years or as otherwise required by the Colorado Department of Public Health and Environment(CDPHE)and 2007 marks the most recent year that costs were replaced. The next replacement of cost estimates is scheduled for 2012. Adjustments for 2011 reflect changes in the closure area subsequent to the 2010 Plan. This Plan also describes the financial assurance mechanism in place to ensure payment of all associated closure and post-closure costs. This Plan is to be used in conjunction with the NWLF Closure/Post Closure Plan dated March 2011. 2.0 REGULATORY REQUIREMENTS 2.1 Cost Estimates Sections 1.8 of the Regulations list the specific financial assurance requirements for solid waste disposal sites. These requirements are described below: 1. Maintain cost estimates, in current dollars, for hiring a third party to close the largest area of the facility requiring closure during the active life of the site. The cost estimate must also include costs associated with conducting post-closure care. 2. The facility must establish financial assurance sufficient to ensure payment of the closure and post-closure care costs. 2.2 Financial Assurance Activities The following are the requirements for financial assurance activities as described in Section 1.8 of the Regulations: 1. Notify CDPHE when the required cost estimates have been placed in the operating record; 2. Annually adjust cost estimates to account for inflation using the method prescribed by CDPHE; 3. Replace original cost estimates with new cost estimates every five (5) years, unless otherwise required by CDPHE; 4. Costs associated with closure, post-closure and corrective actions may be adjusted, after Financial Assurance Plan 1 March 2011 North Weld Landfill approval by CDPHE and the local governing authority; 5. Financial assurance must be provided continuously unless a release is granted by CDPHE. 2.3 Financial Assurance Mechanisms Several financial assurance mechanisms are available, and more than one mechanism may be used. For corporate entities, these mechanisms include a trust fund, letter of credit, surety bond and insurance. Waste Management Disposal Services of Colorado, Inc. (WMC) has chosen to use insurance to meet the financial assurance requirements. The insurance certificate was prepared in accordance with the requirements set forth in Section 1.8.9 of the Regulations. 3.0 CLOSURE AND POST-CLOSURE COSTS Closure and post-closure costs are those costs associated with closing the facility and conducting post-closure care activities. These costs are determined by calculating the cost to complete all of the actions in the Closure/Post Closure Plan. The unit cost values for closure and post-closure activities were determined by WMC. Costs for items including earthwork, excavation and soil placement, were taken from recent bids for similar work completed at Waste Management construction projects. The updated closure costs are provided in Appendix A, and the new post-closure costs are provided in Appendix B. The costs are based on 2007 dollars and inflation adjusted to 2011. 4.0 FINANCIAL ASSURANCE MECHANISM WMC has established insurance coverage to assure adequate funds are available for all closure and post closure care costs determined in the Closure/Post-Closure Plan. The insurance meets all requirements set forth in Section 1.8.9 of the Regulations, "Insurance for Closure and Post- Closure". The insurance certificate is provided in Appendix C. Financial Assurance Plan 2 March 2011 North Weld Landfill APPENDIX A CLOSURE COSTS TABLE 1 -CLOSURE COST ESTIMATE Date: March-11 Site: NORTH WELD LANDFILL Page: 1 Item Description Units Quantity Unit Cost Extended category (Note 1) Cost Cost 1 Foundation Layer a Backfill of intermediate grades to achieve CY 250,000 1.85 462,500 minimum 5% slope (on-site source) b Other Foundation Layer Closure Costs 0 Foundation Layer Total Cost 462,500 2 Final Cover Section Closure Area: 76.0 Acres a Compacted Clay Layer(on-site source) CY 0 b Alternative Final Cover(on-site source) CY 195,000 1.85 360,750 c Topsoil (on-site source) CY 62,000 1.85 114,700 d Fertilizer/Soil Amendements/material hauling Acre 76.0 834.00 63,384 e Seeding Acre 76.0 620.00 47,120 f Other Final Cover Closure-Related Costs Acre 0 Final Cover Total Cost 585,954 3 Surface Water Controls a Drainage Swales/Berms/Channels LF 3,400 7.45 25,330 b Culverts 0 c Sedimentation/Surface Wtr Control Ponds 0 d Erosion Control 0 e Other Surface Water Closure-Related Costs 0 Surface Water Total Cost 25,330 4 Environmental Monitoring Installations a Grndwtr Mntg Wells w/dedicated pumps EA 0 b Gas Monitoring Probes EA 0 c Other Env. Monitoring Closure Costs 0 Environmental Monitoring Total Cost 0 5 Gas Collection and Control System (GCCS) a Extraction Well Installation 0 b Extraction Well -Well Head Assembly 0 c Extraction Well- Lateral Pipe 0 d GasNapor Collection - Header Pipe 0 e GasNapor Collection - Header Drain 0 f Blower 0 g Blower Enclosure/Building 0 h Flare 0 i Other GCCS Closure-Related Items 0 GCCS Total Cost 0 TABLE 1 -CLOSURE COST ESTIMATE (Continued) Date: March-11 Site: NORTH WELD LANDFILL Page: 2 Item Description Units Quantity Unit Cost Extended Category (Note 1) Cost Cost 6 Miscellaneous Closure Activities a Access Road Construction 0 b Fencing 0 c Signs EA 2 150.00 300 d Other Miscellaneous Closure-Related Items 0 Miscellaneous Total Cost 300 7 CLOSURE COST ESTIMATE SUBTOTAL 1,074,084 8 Engineering & Project Management a Design & Bid Documents (% of Subtotal) 3% 32,223 b CQA, Surveys & Reports (% of Subtotal) 10% 107,408 c _Project Mgmt&Admin (% of Subtotal) 2% 21,482 Engineering & Project Mgmt Total Cost 161,113 9 Contingency (% of Subtotal) 10% 107,408 10 CLOSURE COST ESTIMATE TOTAL (in 2007 dollars) $1,342,605 11 Inflation Adjustment Factor for 2008 1.027 12 Inflation Adjustment Factor for 2009 1.021 13 Inflation Adjustment Factor for 2010 1.012 14 Inflation Adjustment Factor for 2011 1.009 Total Closure Cost(adjusted to 2011 dollars -Line 10 x Lines 11 through 14) $1,437,527 Notes: 1 All costs include material and installation unless noted otherwise. APPENDIX B POST-CLOSURE CARE COSTS TABLE 2-POST-CLOSURE COST ESTIMATE Date: March-11 Site: NORTH WELD LANDFILL Acres at Closure: 92 Item Description Units Unit Unit Cost Quantity Cost per Quantity per Year Year la Facility Inspections& Reporting-2 per year EA 1 1,000 2 2,000 1b Facility Inspections& Reporting-2 addt'l Annual cost for 2 addt'l events=2,000 events to allow for qtrly inspections first Total Item cost for 2-yr period=4,000 2 yrs of post-closure. Total Item cost annualized over 30-yr PC period= 133 2 Qualitative Vegetative Assessement-annual EA 1 1,500 1 1,500 3a Cover Maintenance, Reseeding&Fertilizing- AC 5% 2,181 4.6 10,033 5%of site per year(Note 1) 3b Cover Maintenance, Reseeding&Fertilizing- Annual cost for addt'l 5%= 10,033 addt'l 5%per year to allow for 10%of the Total Item cost for 2-yr period= 20,065 site first 2 yrs of post-closure Total Item cost annualized over 30-yr PC period= 669 4 Surface Water Controls-Maintenance LS 1,000 1 1,000 5 Fence Repair LS 500 1 500 6 Mowing-Assume annual mowing for first 10 AC 1 20 92 years of post-closure Annual mowing cost= 1,840 Cost for 10 mowing events= 18,400 Total Item cost annualized over 30-yr PC period= 613 7 Groundwater Monitoring-Semi-annual events EA 5 1,111 2 11,110 8 Groundwater Well Pump Repair/Maintenance LS 300 1 300 9 Gas Probe Monitoring, Maintenance and EA 15 92 4 5,520 Reporting-4 Events per Year 10 Leachate Monitoring-Annual EA 3 461 1 1,383 11 Leachate Depth Measurement-Semi-annual EA 3 237 2 1,422 12 Leachate Management-First 5 years of post- Annual cost for leachate mgmt= 5,000 closure(managed on-site)(Note 2) Total Item cost for 5-yr period= 25,000 Total Item cost annualized over 30-yr PC period= 833 13 Gas Collection and Control Syst Maint LS 0 14 Gas Condensate Disposal GAL 0 15 Subtotal-Items 1 through 14 37,016 16 Administrative Costs(%of Subtotal) 5% 1,851 17 Contingency(%of Subtotal) 10% 3,702 18 Total Cost per Year 42,569 19 Post-Closure Care Period: 30 Years 20 Total Post-Closure Cost(in 2007 dollars) $1,277,067 21 Inflation Adjustment Factor for 2008 1.027 22 Inflation Adjustment Factor for 2009 1.021 23 Inflation Adjustment Factor for 2010 1.012 24 Inflation Adjustment Factor for 2011 1.009 Total Post-Closure Cost(adjusted to 2011 dollars-Line 20 x Lines 21 through 24) $1,367,356 Notes. 1 Unit cost for Item 3 is based on the Fertilizer,Soil Amendment and Seeding costs of the Closure Cost Estimate(Table 1)increased by a factor of 1.5 to provide an allowance for cover maintenace in addition to seeding,fertilizer and amendments. 2 Due to arid climate,leachate generation is not expected at closure. However,an annual allowance for leachate management is provided for the first 5 years of post-closure in the event of premature closure. Basis for Costs Line la $1,000 based on 9 hrs for site inspector @$70/hr and 3 hrs for report preparation @$120/hr 2 $1,500 vegetation assessement based on actual 2007 3rd party costs for this service 3a $1,803 based on Table 1,Line 2d and 2e values increased by a factor of 1.5 4 8 5 Estimated values 6 $20/acre mowing cost based on 3rd party bid submitted to DADS 7 Based on actual 3rd party sampling and lab costs 8 Estimated value 9 Based on representative 3rd party costs from other Colorado WM landfills 10 Based on actual 3rd party sampling costs 11 Based on actual 3rd party costs • APPENDIX C INSURANCE CERTIFICATE FOR CLOSURE AND POST-CLOSURE CARE COSTS ANNUAL ADJUSTMENT TO CLOSURE AND POST-CLOSURE COST ESTIMATES The NWSL Financial Assuarance Plan as revised March 2011 includes a closure cost estimate of $1,437,527 (Appendix A) and a post-closure cost estimate of$1,367,356 (Appendix B) for a combined total estimate of$2,804,883. These estimates are based on the site Closure and Post- Closure Plan revised March 2011. These estimates are based on 2007 dollars, inflation adjusted to 2011 dollars. The accompanying insurance certificate reflects this adjusted amount. a ACORD, CERTIFICATE OF LIABILITY INSURANCE DATE 04/01/2 WDD i) PRODUCER THIS CERTIFICATE IS ISSUED AS A MATTER OF INFORMATION National Guaranty Insurance Company of Vermont ONLY AND CONFERS NO RIGHTS UPON THE CERTIFICATE HOLDER. THIS CERTIFICATE DOES NOT AMEND, EXTEND OR 100 Bank Street, Suite 610 ALTER THE COVERAGE AFFORDED BY THE POLICIES BELOW. Burlington,Vermont 05401 (802)864-1715 INSURERS AFFORDING COVERAGE NAIC# INSURED INSURER A: National Guaranty Insurance Company Waste Management Disposal Services of Colorado, Inc. INSURER B: of Vermont 5500 South Quebec Street, Suite 250 INSURER C: Greenwood Village, Colorado 80111 INSURER a INSURER E: COVERAGES THE POLICIES OF INSURANCE LISTED BELOW HAVE BEEN ISSUED TO THE INSURED NAMED ABOVE FOR THE POLICY PERIOD INDICATED.NOTWITHSTANDING ANY REQUIREMENT,TERM OR CONDITION OF ANY CONTRACT OR OTHER DOCUMENT WITH RESPECT TO WHICH THIS CERTIFICATE MAY BE ISSUED OR MAY PERTAIN,THE INSURANCE AFFORDED BY THE POLICIES DESCRIBED HEREIN IS SUBJECT TO ALL THE TERMS,EXCLUSIONS AND CONDITIONS OF SUCH POLICIES.AGGREGATE LIMITS SHOWN MAY HAVE BEEN REDUCED BY PAID CLAIMS. INSR ADD'L POLICY NUMBER POLICY EFFECTIVE POLICY EXPIRATION LIMITS LTR NSRD TYPE OF INSURANCE DATF IMM/DD/1'1'1 DATE IMM/DDNYl GENERAL LIABILITY EACH OCCURRENCE $ DAMAGE TO RENTED COMMERCIAL GENERAL LIABILITY PREMISES(Ea occurence) $ 1 CLAIMS MADE OCCUR MEDEXP(Any one person) $ PERSONAL&ADV INJURY $ GENERAL AGGREGATE $ GEN'L AGGREGATE LIMIT APPLIES PER: PRODUCTS-COMP/OP AGG $ POLICY PROT- LOC JFC AUTOMOBILE LIABILITY COMBINED SINGLE LIMIT ANY AUTO (Ea accident) ALL OWNED AUTOS BODILY INJURY SCHEDULED AUTOS (Per person) HIRED AUTOS BODILY INJURY $ NON-OWNED AUTOS (Per accident) PROPERTY DAMAGE (Per accident) GARAGE LIABILITY AUTO ONLY-EA ACCIDENT $ ANY AUTO OTHER THAN EA ACC $ AUTO ONLY: AGG $ EXCESS/UMBRELLA LIABILITY EACH OCCURRENCE $ OCCUR CLAIMS MADE AGGREGATE $ DEDUCTIBLE $ RETENTION $ $ WC STATU- OTH- WORKERS COMPENSATION AND TORY I IMITS ER EMPLOYERS'LIABILITY E.L.EACH ACCIDENT ANY PROPRIETOR/PARTNER/EXECUTIVE $ OFFICEWMEMBER EXCLUDED? E.L.DISEASE-EA EMPLOYEE $ If yes,describe under SPECIAL PROVISIONS below E.L.DISEASE-POLICY LIMIT $ OTHER A Closure CPCS99-0013 4/09/11 4/09/12 $1,437,527.00 Post-Closure $1,367,356.00 DESCRIPTION OF OPERATIONS/LOCATIONS/VEHICLES/EXCLUSIONS ADDED BY ENDORSEMENT/SPECIAL PROVISIONS North Weld Sanitary Landfill, 40000 Weld County Road 25, Ault, CO 80610 This certificate certifies that the policy to which this certificate applies provides closure and/or post-closure care in connection with the Insured's obligation to demonstrate financial responsibility under Section 1.8.9 of the regulations pertaining to Solid Waste Disposal Sites and Facilities 6 CCR 1007-2, as amended. CERTIFICATE HOLDER CANCELLATION Director SHOULD ANY OF THE ABOVE DESCRIBED POLICIES BE CANCELLED BEFORE THE EXPIRATION Colorado Department of Public Health and Environment DATE THEREOF,THE ISSUING INSURER WILL lialQ€IJWflQMAIL 120 DAYS WRITTEN Hazardous Materials/Waste Management Division NOTICE TO THE CERTIFICATE HOLDER NAMED TO THE LEFT)BIRTB/RIBt[9OIIQLRI WALK 4300 Cherry Creek Drive South WPM xCgiDIUGzvmM@YIADCIWO5 x3 XNUD7iE1L iciaireTB%61X Denver, Colorado 80246-1530 FedraaE#H kftNEsX {,\J,2,r,_,K a \. t0 i AUTHORIZED REPRESENTATIVE _Donna L. Meals,Vice President and Secretary ACORD 25(2001108) ©ACORD CORPORATION 1988 IMPORTANT If the certificate holder is an ADDITIONAL INSURED, the policy(ies) must be endorsed. A statement on this certificate does not confer rights to the certificate holder in lieu of such endorsement(s). If SUBROGATION IS WAIVED, subject to the terms and conditions of the policy, certain policies may require an endorsement. A statement on this certificate does not confer rights to the certificate holder in lieu of such endorsement(s). DISCLAIMER The Certificate of Insurance on the reverse side of this form does not constitute a contract between the issuing insurer(s), authorized representative or producer, and the certificate holder, nor does it affirmatively or negatively amend, extend or alter the coverage afforded by the policies listed thereon. ACORD 25(2001/08) CLOSURE/POST-CLOSURE PLAN NORTH WELD LANDFILL Weld County, Colorado Prepared by: Waste Management Disposal Services of Colorado, Inc. North Weld Landfill 40,000 Weld County Road 25 Ault, Colorado qvvim1111/,,, "o 241/6 -m-i Reviewed By: • y�l: a Thomas S. Se weitzer, PE �1, • be•• ,4;,:-. Registered Professional Engine{piss/0/VAL�E ,, State of Colorado License#24176 Revised March 2011 CLOSURE/POST-CLOSURE PLAN NORTH WELD LANDFILL TABLE OF CONTENTS Section Page 1.0 INTRODUCTION 1 1.1 PURPOSE 1 1.2 FACILITY INFORMATION 1 2.0 CLOSURE PLAN 2 2.1 INTRODUCTION 2 2.1.1 Description 2 2.1.2 Regulatory Requirements 2 2.2 CLOSURE ACTIVITIES 3 2.3 MAXIMUM EXTENT OF OPERATIONS 4 2.4 FINAL COVER 4 2.4.1 Final Grades 4 2.4.2 Final Cover Description 4 2.5 CONSTRUCTION 5 2.6 CONSTRUCTION QUALITY ASSURANCE(CQA) 5 2.7 CLOSURE SCHEDULE 6 3.0 POST-CLOSURE PLAN 7 3.1 INTRODUCTION 7 3.1.1 Description 7 3.1.2 End Use 7 3.1.3 Regulatory Requirements 7 3.2 POST-CLOSURE ACTIVITIES 8 3.2.1 Facility Management 8 3.2.2 Post-Closure Activities 8 LIST OF FIGURES Figure 1 Site Location Map 2 Closure Area Map 3 Backfill Area Map 4 Post-Closure Drainage Channel 5 Closure Schedule Closure/Post Closure Plan ri March 2011 North Weld Landfill CLOSURE/POST-CLOSURE PLAN NORTH WELD LANDFILL REVISION LOG DATE DESCRIPTION OF REVISION BY 4/97 Update Plan originally submitted to CDPHE 10/93, to reflect operational TS/AS changes 3/01 Update Plan to increase estimate of largest area of the landfill ever TS/AS requiring final cover during the active life 4/03 Update Plan to increase estimate of largest area of the landfill ever TS/AS requiring final cover during the active life 3/05 Update Plan to increase estimate of largest area of the landfill ever TS/AS requiring final cover during the active life and modify text in Sections 2.4, 2.5 and 2.6 to reflect approval of an alternative final cover design 3/06 Updated Plan to decrease estimate of largest area of the landfill requiring TS/AS final cover during the active life. Miscellaneous text changes were also made to the Plan. 3/07 Updated Plan to reflect changes to the corresponding Financial Assurance TS/AS Plan dated March 2007 specifically replacing cost estimates prepared in 2002 with new cost estimates; updated Plan to adjust estimate of largest area of the landfill requiring final cover during the active life; update soil Imeldl] quantities. Miscellaneous text changes were also made to the Plan. 3/09 Updated Plan to adjust estimate of largest area of the landfill requiring TS/AS final cover during the active life; update soil backfill quantities; included drawing illustrating surface water control structures that remain to be constructed and areas requiring backfill to achieve 5% slope. 3/10 Updated Plan to adjust estimate of largest area of the landfill requiring TS final cover during the active life; updated soil backfill quantities to achieve 5% slope;updated post-closure acreage. 3/11 Updated Plan to adjust estimate of largest area of the landfill requiring TS final cover during the active life; updated post-closure acreage. Closure/Post Closure Plan �.. March 2011 North Weld Landfill 1.0 INTRODUCTION 1.1 PURPOSE This Closure/Post-Closure Plan(Plan) for the North Weld Landfill (NWLF) reflects the facility's present understanding of closure and post-closure care requirements for this solid waste disposal site. It has been prepared to meet the following objectives: 1. Describe the steps necessary to close the site when the cost of closure would be the greatest. 2. Describe the activities to be conducted during the post-closure care period. This Plan has been prepared in accordance with the provisions of the Colorado "Regulations Pertaining to Solid Waste Disposal Sites and Facilities", 6 CCR 1007-2 (Regulations). Sections 2.5 and 3.5 of the Regulations pertain to closure activities and Sections 2.6 and 3.6 pertain to post- closure activities. This Plan is to be used in conjunction with the Financial Assurance Plan for NWLF revised March 2011. Cost estimates are calculated in the Financial Assurance Plan for the closure and post-closure care activities described in this Plan. 1.2 FACILITY INFORMATION NWLF is located approximately six miles west of Highway 85, on Colorado Highway 14, in the southwest quarter of Section 7, Township 7 North, Range 66 West, as shown on Figure 1. The facility is owned and operated by Waste Management Disposal Services of Colorado (WMC). The site consists of 170 acres, 119 of which are permitted for municipal solid waste disposal, and an approximate disposal capacity of 15 million bank cubic yards. Current operations are in Phase 2, Module 4. The facility accepts non-hazardous municipal, commercial and industrial solid wastes. NWLF will be developed in four phases: 1, 2, 3A and 3B. The site will be closed and monitored as a single unit. Individual phases will not be closed or monitored separately; therefore,this plan addresses the site as a whole. However, operational factors occurring during the life of the site may necessitate closure or monitoring of portions of the site individually. Closure/Post Closure Plan 1 March 2011 North Weld Landfill 2.0 CLOSURE PLAN 2.1 INTRODUCTION 2.1.1 Description This closure plan describes the steps necessary to close the facility at any point during its active life. This plan will be reviewed and updated as needed for changing conditions. 2.1.2 Regulatory Requirements This closure plan is prepared in accordance with Section 2.5, "Closure of Solid Waste Disposal Sites and Facilities" and Section 3.5, "Closure" of the Regulations. This plan will be maintained in the facility operating record. The closure requirements call for a closure plan, a description of the closure activities and the closure certification. The requirements are summarized below: Closure Plan 1. Prepare a closure plan for approval by the CDPHE after consultation with the local governing body having jurisdiction. The plan,at a minimum, must include the following: a. The steps necessary to close the landfill at any point during its active life. b. A description of the final cover system and the methods and procedures to be used to install the cover. c. An estimate of the largest area of the landfill ever requiring a final cover during the active life. d. A schedule for completing closure activities. 2. Maintain a copy of the closure plan in the operating record. Closure Activities 1. Close the site in accordance with the Solid Waste Disposal Sites and Facilities Act and the Regulations. 2. Sixty(60) days prior to closure notify the CDPHE and the local governing body in writing that the facility will be closing. 3. Sixty(60) days prior to closure notify the general public of the facility closure by posting clearly visible signs of suitable size at the site entrance. 4. Enact precautions to prevent further use of the site for unauthorized disposal. Closure/Post Closure Plan 2 March 2011 North Weld Landfill 5. Prevent water pollution from occurring at or beyond the point of compliance. 6. Prevent nuisance conditions at or beyond the site boundary. 7. Initiate closure activities within thirty(30)days of reaching final design grades unless an extension is obtained from CDPHE. 8. Complete closure within 180 days after closure initiation, or if necessary, obtain an extension from the CDPHE. Closure Certification 1. Following closure, submit a report certified by a Colorado professional engineer (P.E.)to the CDPHE documenting that closure has been completed in accordance with the closure plan. Place a copy of the report in the facility operating record. 2. Following closure, record a notation on the deed or other title instrument stating that the land was used as a landfill and its use is restricted. Notify the CDPHE and the local governing authority that the notation has been recorded and place a copy of the notation in the operating record. 2.2 CLOSURE ACTIVITIES The following closure activities will be performed when site closure is necessary: 1. Construction Documents—Closure construction plans will be prepared as needed. 2. Regulatory Agency Notification - Sixty(60) days prior to closure of any landfill phase, a notification of the intent to close will be submitted to the CDPHE and the local governing authority and a copy of the notice will be placed in the operating record. 3. Public Notification - Sixty (60)days in advance of closure date, signs will be placed at entrance to the site notifying the general public of the closure date. 4. Final Cover- Final cover will be placed in accordance with the Regulations. The final cover design is discussed in detail in Section 2.3 of this Plan. 5. Completion of Closure-Closure activities will be completed within 180 days following closure. A request for an extension may be submitted to CDPHE if climatic or operational factors dictate that additional time is required for proper closure. 6. Certification/Documentation - Upon completion of construction, a report will be prepared by a Colorado P.E. certifying that closure was conducted in accordance with the provisions Closure/Post Closure Plan 3 March 2011 North Weld Landfill of this plan. The report will be submitted to CDPHE for approval after consultation with the local governing board. The approved report will be placed in the operating record. To complete closure a notation will be made on the title or deed to the land, which notifies prospective buyers that the land was used as a landfill, and that certain land use restrictions apply. Copies of the notation will be submitted to CDPHE and the local governing body and a copy will also be placed in the operating record. 7. Security - During closure activities and after closure, public disposal will be prohibited. Signs will be posted warning of unauthorized entry or waste disposal. The existing fence will be maintained and the front gate will be kept locked when not in use. 2.3 MAXIMUM EXTENT OF OPERATIONS An estimate of the largest area of the landfill currently requiring final cover is about 76 acres in Phases 1, 2 and 3A as shown in Figure 2. The estimated 76 acre closure area is based on the facility's current disposal activities, a 7.6 acre disposal cell in Phase 3A to be constructed in 2010, and less 16 acres of final cover completed in 2006. The estimated closure area is also based on the facility's projected disposal activities over a five year period. Section 1.8.3(D) of the Regulations requires the closure and post-closure cost estimates to be recalculated every five years unless otherwise required by CDPHE. The last recalculation was performed in 2007 and the associated cost estimates are included in the corresponding Financial Assurance Plan, inflation adjusted to 2011 dollars. The next replacement of cost estimates is scheduled for 2012. 2.4 FINAL COVER 2.4.1 Final Grades Final grades have been designed to promote surface water runoff and minimize erosion. Final grade slopes are designed to be a minimum of 5 percent (20 to 1)and a maximum of 25 percent (4 to 1), unless alternative grades have been approved by CDPHE. Prior to placement of final cover, areas of the site that have not been filled to final grades may require placement of backfill to achieve 5% slopes. About 250,000 cubic yards of on- site soils are estimated for achieving minimal slopes prior to placement of final cover. Figure 3 shows the area of backfill needed to achieve 5% slopes. 2.4.2 Final Cover Description NWLF received approval from CDPHE and Weld County Department of Public Health and Environment(WCDPHE)for an alternative final cover(AFC)design on March 30, 2004 and September 3, 2004 respectively. The AFC components are described below. 1. Alternative Final Cover Layer- The AFC layer will consist of a minimum of 18 Closure/Post Closure Plan 4 March 2011 North Weld Landfill inches of slightly compacted soil from on-site sources. AFC thickness on the side slope will be increased to 20 inches in accordance with the AFC design. The AFC components should have no less than 15% fines content and be compacted to between 80%to 90%of maximum density as determined by Standard Proctor (ASTM D 698). Approximately 195,000 cubic yards of soil will be necessary for the AFC layer. This assumes an average 19-inch AFC layer will be installed over the 76-acre area. 2. Alternative Final Cover Topsoil Layer—The 6-inch topsoil layer of the AFC will have no less than 30% fines content and be compacted to between 80% and 90%of maximum density as determined by Standard Proctor(ASTM D698). The 6-inch topsoil layer of the AFC will be material suitable for sustaining vegetation. AFC seedbed preparation, seed mix and fertilizer requirements are specified in the approved"North Weld Landfill Alternative Final Cover Demonstration"prepared by Golder Associates dated December 30, 2003. Approximately 62,000 cubic yards of soil will be required for the topsoil layer over the 76-acre area. 2.5 CONSTRUCTION Construction of the final cover system will be performed by using equipment such as scrapers to excavate,haul and place loose soil lifts for the AFC layer. A motor grader, low ground pressure dozer, or other suitable equipment will be used to spread/shape the cover. The topsoil layer will be placed loosely over the AFC layer with scrapers and then shaped with a motor grader, low ground pressure dozer, or other suitable equipment. The topsoil layer will then be prepared in accordance with specifications provided in the above referenced North Weld Landfill Alternative Final Cover Demonstration. 2.6 CONSTRUCTION QUALITY ASSURANCE (CQA) To ensure proper implementation of the AFC design the following CQA requirements apply: • Performance of grain-size distribution tests every 5,000 cubic yards will be conducted for the AFC layer and the 0.5 foot topsoil layer; • Performance of Standard Proctor tests every 10,000 cubic yards; • In-situ density testing using a nuclear gauge at a frequency of one test per 1,000 cubic yards; • Oven-dry moisture contents at a frequency of one test every 1,000 cubic yards; • Verification of proper thickness of cover at a grid spacing of approximately 100 feet on-center. Closure/Post Closure Plan 5 March 2011 North Weld Landfill A design drawing showing the area of AFC to be built and a detail of the cover cross-section will be supplied to the CDPHE and WCDPHE prior to construction. Also, an as-built construction drawing will be provided with the certification report that shows the survey points used to verify thickness on the approximately 100 feet on-center grid pattern. Upon completion of construction activities, a Colorado P.E. will sign a certification document indicating that the final cover was constructed in substantial conformance with the project specifications and approved closure plan. 2.7 CLOSURE SCHEDULE The schedule for closure is weather dependent. Excessive cold or rainy weather can affect placement of cover materials. The typical available construction window for placing cover materials in this climate is from late April through late September. A typical closure schedule is provided in Figure 5. If necessary, a request for an extension will be submitted to CDPHE to ensure that sufficient time is available to complete closure in accordance with the provisions of this closure plan. Closure/Post Closure Plan 6 March 2011 North Weld Landfill 3.0 POST-CLOSURE PLAN 3.1 INTRODUCTION 3.1.1 Description This post-closure plan describes all actions to be taken following closure of the site. Post- closure care begins after the site is closed in accordance with the closure plan. Post-closure care continues for a period of 30 years, unless during the life of the facility or the post- closure period, a demonstration is made to the CDPHE and the local governing body, which shows that a reduced time period is sufficient to protect human health and the environment. If the post-closure period is reduced, this plan will be updated accordingly. 3.1.2 End Use Upon completion of closure, current plans indicate that the site will be zoned for agricultural use. This end use should have minimal impact on the final cover, and the use will not interfere with post-closure monitoring. 3.1.3 Regulatory Requirements This post-closure plan is prepared in accordance with Section 2.6 "Post-Closure Care and Maintenance Standards" and Section 3.6, "Post-Closure Care and Maintenance"of the Regulations. This plan will be maintained in the facility operating record. The regulatory requirements are summarized below: Post-Closure Plan 1. Prepare a post-closure plan for approval by CDPHE in consultation with the local governing body, which includes the provisions to prevent or minimize nuisance conditions,maintain the final cover, monitor groundwater, maintain and monitor the leachate collection system, and monitor landfill gas. 2. Describe the planned end use for the site and identify the name and address of a contact person who is responsible for the facility. 3. Maintain a copy of the post-closure plan in the site's operating record. Post-Closure Activities 1. The post-closure period shall be at least 30 years unless a demonstration is made to CDPHE and the local governing body that a shorter time period is sufficient to protect human health and the environment. 2. Permanent surface water structures remaining after closure shall be designed to manage run-on and run-off from a 100 year, 24-hour storm event. Figure 4 shows the general location of permanent stormwater channels anticipated to be Closure/Post Closure Plan 7 March 2011 North Weld Landfill constructed as part of closure activities. 3. Enact precautions to prevent water pollution at the point of compliance after closure. 4. Enact precautions to prevent nuisance conditions at or beyond the site boundary after closure. 5. Post-closure monitoring shall be conducted in accordance with the approved post-closure monitoring plan. 6. At the completion of the post-closure care period, a notification will be submitted to CDPHE with a certification signed by an independent Colorado Registered Professional Engineer or approved by the CDPHE and the local governing body having jurisdiction verifying that post-closure care has been completed in accordance with the post-closure plan. The notification will be placed in the operating record. 3.2 POST-CLOSURE ACTIVITIES 3.2.1 Facility Management During the post-closure period, a facility manager will be named and a phone number and address for the manager will be incorporated into this plan. The manager currently responsible for the facility is: Mr. William Hedberg North Weld Sanitary Landfill 40,000 WCR 25 Ault, Colorado (970) 686-2800 3.2.2 Post-Closure Activities The following post-closure activities provide for inspection,maintenance, and monitoring of the design features of the facility during the post-closure period: 1. Inspections - Inspections of the site will be conducted quarterly for the first two years after closure and semi-annually thereafter. The inspector will assess the conditions of the site and recommend corrective actions for any items needing attention. Items to be inspected are further described in the following line items and include nuisance conditions,the final cover system, groundwater monitoring points, leachate monitoring system, gas monitoring system, surface water management system, and security. Closure/Post Closure Plan 8 March 2011 North Weld Landfill 2. Prevent Nuisance Conditions - The placement of final cover provides a barrier between the refuse and the environment. Construction of the final cover in substantial conformance with the project specifications should prevent disease vectors, deter birds, minimize odors,reduce blowing litter, and minimize air and water pollution as direct contact with refuse is prevented. Inspections and continued maintenance of the final cover system will ensure the integrity of the final cover so nuisance conditions are prevented throughout the post-closure period. The potential for on-site litter,traffic congestion, and noise pollution will be eliminated once the closure of the facility is complete since refuse will no longer be accepted for disposal and heavy equipment will no longer be operating. 3. Final Cover System - The maintenance of the final cover may involve repair of the AFC layer, the erosion layer and vegetation. It is estimated that 5% of the site per year will require cover maintenance, reseeding and fertilizer. An additional 5% is estimated, which will allow for 10%of the site for the first 2 years of post-closure for cover maintenance,reseeding and fertilizer. Additionally,NWLF will conduct a qualitative vegetation assessment annually during post-closure to ensure the vegetative cover is established and assist in identifying any areas that may require attention. 4. Groundwater Monitoring- The current groundwater monitoring program consists of 5 wells, which will be monitored in accordance with the Site Specific Groundwater Monitoring Plan(GWMP). Depending on the monitoring analytical data obtained during the site operating period,the number of wells and the monitoring frequency may be reduced during the post-closure care period with concurrence by CDPHE and the local governing authority. For this plan it is estimated that groundwater monitoring will be performed semi-annually. Samples will be analyzed for the constituents listed in the Groundwater Management Plan. The results of all analysis will be placed in the site's operating record. Monitoring results will be reviewed and a statistical evaluation performed comparing each event's results to background levels. Detection monitoring will continue as long as results remain below specified levels for each constituent. If the statistical evaluation shows that background levels are exceeded, confirmation sampling, and if necessary, corrective action will be performed in accordance with the GWMP and this plan will be updated as necessary. In addition to sampling, it is estimated that one well will require repair each year and a new pump will be required every five years. The integrity of the monitoring well system will be inspected during the monitoring events or during the annual site inspections. Any required repairs will be corrected. 5. Leachate Monitoring- The liquid elevation in the leachate collection sumps will Closure/Post Closure Plan 9 March 2011 North Weld Landfill be monitored semi-annually to verify the levels are 1 ft or less above the base liner. The measurements will be taken concurrent with semi-annual groundwater monitoring or site inspection activities. Leachate samples from the sumps will be taken annually for analysis, if leachate is present. Although leachate is not expected during post-closure, in the event that leachate is removed from a sump, it will be managed in accordance with the analytical data and approved leachate management procedures. Information related to the number of gallons removed, date, time, and location of leachate removal, and the disposal method will be maintained in the facility operating record. Due to the arid climate leachate generation is not expected at closure.Nevertheless, during the post-closure period, an allowance for leachate management is provided for the first 5 years of post-closure in the event of premature closure. A demonstration may be made to the CDPHE showing that the leachate no longer poses a threat to human health and the environment and that monitoring can cease. 6. Gas Monitoring - The facility will continue to monitor gas at the site quarterly in accordance with the Landfill Gas Migration Monitoring Plan(LGMMP). The post- closure cost estimate assumes the 15 gas monitoring probes(currently in the program) will be monitored during post-closure. Based on the monitoring data obtained during the site operating period, the number of probes and the frequency of monitoring may be reduced during the post-closure care period with concurrence by CDPHE and the local governing authority. Results from each gas monitoring event will be placed in the site's operating record. If monitoring results indicate thatmethane gas is present above the permissible regulatory limits, measures will be taken in accordance with Section 2.3.3 of the Regulations. 7. Surface Water Management System - Maintenance of the surface water management system is expected to be required during the post-closure period. This maintenance consists of regrading or desilting channels and ponds. In addition, semi-annual inspections of the stormwater system will be performed. Inspections of permanent stormwater management structures will be performed following storm events exceeding the 100 year, 24 hour storm event. 8. Waste Disposal - Off-site refuse will not be accepted during the post-closure period. However, if during post-closure repairs, previously placed refuse is excavated for construction activities,the refuse will be placed within the permitted fill area and final cover will be applied. 9. Security- During post-closure,the perimeter fence will remain in place and the front gate locked when not in use. Signs will be posted warning of unauthorized entry. Closure/Post Closure Plan 10 March 2011 North Weld Landfill The integrity of the fence will be monitored and maintenance performed as necessary. 10. Certification - At the completion of the post-closure care period, a notification will be submitted to CDPHE with a certification signed by an independent Colorado Registered Professional Engineer or approved by the CDPHE and the local governing body having jurisdiction verifying that post-closure care has been completed in accordance with the post-closure plan. The notification will be placed in the operating record. Closure/Post Closure Plan 11 March 2011 North Weld Landfill FIGURES it E:l' :Lk, ‘7; tS) NM Ir S ri AMIE IS AM tl' 4 -w * llama. 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RECEIVED 240Englewood, wooWes ,Union Avenue APR 1 8 2011 Englewood, (P 80110 303-914-1445(Phone) WASTE MANAGEMENT gold ibur.ty ;-1'a m' ,g Department 303-914-9937(Fax) CREEL-v OFFICE April 14, 2011 Ms. Marley Shoaf Colorado Department of Public Health and Environment Air Pollution Control Division APCD-SS-B1 4300 Cherry Creek Drive South Denver, CO 80246-1530 Certified Mail 7006 2150 0004 4548 8693 SUBJECT: NORTH WELD LANDFILL (NWLF) TITLE V OPERATING PERMIT# 97OPWE181 2011 SEMI-ANNUAL MONITORING REPORTS Dear Ms. Shoat: In accordance with the NWSL Title V Operating Permit # 97OPWE181, attached are the following reports covering the monitoring period of October 1, 2010— March 31, 2011. • Monitoring and Permit Deviation Reports, Part I • Monitoring and Permit Deviation Reports, Part II • Monitoring and Permit Deviation Reports, Part III In addition, the responsible official has changed from Mr. Scott Bradley, Area Vice President, to Mr. Brad Pollock, Director of Landfill Operations. Should you have any questions regarding these reports, please contact me at(303) 914-1445 or Mr. Bill Hedberg at (970) 686-2800 ext. 23. Sincerely, Tom chweitzer Engineering Manager Attachments cc: Dana Podell, CDPHE APCD, w/enc. Douglas Ikenberry, CDPHE, w/enc. Troy Swain, WCDPHE, w/enc. Kim Ogle, WCDPS, w/o enc. Bill Hedberg, Waste Management Bruce Clabaugh, Waste Management aoi I- 0515 Oernmuau(ati mis 5t/.2sis,w', FL-01.-77 RECEIVED 2400 West Union Avenue Englewood, CO 80110 303-914-1445(Phone) WASTE MANAGEMENT APR 1 8 2011 303-914-9937(Fax) Weld Coin,.; a Department GREEI_�Y OFFICE April 14, 2011 Ms. Cindy Beeler, Environmental Engineer Office of Enforcement, Compliance and Environmental Justice Mail Code 8 ENF-T U.S. Environmental Protection Agency, Region VIII 1595 Wynkoop Street Denver, CO 80202-1129 Certified Mail 7006 2150 0004 4548 8662 SUBJECT: NORTH WELD LANDFILL (NWLF) TITLE V OPERATING PERMIT NUMBER 97OPWE181 2011 ANNUAL COMPLIANCE CERTIFICATION REPORT Dear Ms. Beeler In accordance with the NWLF Title V Operating Permit#97OPWE181, enclosed is the 2011 Annual Compliance Certification Report, which covers the period April 1, 2010 through March 31, 2011. This report reflects a minor deviation in the permit reporting requirements during this reporting period. The first semi-annual 2010 monitoring reports and 2010 annual compliance certification report were submitted after the May 1, 2010 due date. Additional detail regarding this deviation was provided to you in the transmittal letter for the 2010 annual compliance certification report. In addition, the responsible official has changed from Mr. Scott Bradley, Area Vice President, to Mr. Brad Pollock, Director of Landfill Operations. Should you have any questions regarding this report, please contact me at (303) 914-1445 or Mr. Bill Hedberg at(970) 686-2800 ext. 23. ( Sincerely, Tom chweitzer Engineer Manager Attachment cc: Douglas lkenberry, CDPHE, w/enc. Troy Swain, WCDPHE, w/enc. Kim Ogle, WCDPS, w/enc. Dana Podell, CDPHE, w/enc. Bruce Clabaugh, Waste Management Bill Hedberg, Waste Management Air Pollution Control Division Colorado Operating Permit Annual Compliance Certification Report Annual Compliance Certification Report Following is the format for the Compliance Certification Report to be submitted to the Division and the U.S. EPA annually based on the effective date of the permit. The Table below must be completed for all equipment or processes for which specific Operating Permit terms exist. FACILITY NAME: Waste Management Disposal Services of Colorado Inc. —North Weld Sanitary Landfill OPERATING PERMIT NO: 97OPWE181 REPORTING PERIOD: 04/01/10-03/31/11 I. Facility Status During the entire reporting period, this source was in compliance with ALL terms and conditions contained in the Permit, each term and condition of which is identified and included by this reference. The method(s) used to determine compliance is/are the methods specified in the Permit. X With the possible exception of the deviations identified in the table below,this source was in compliance with all terms and conditions contained in the Permit, each term and condition of which is identified and included by this reference, during the entire reporting period. The method used to determine compliance for each term and condition is the method specified in the Permit, unless otherwise indicated and described in the deviation report(s). Note that not all deviations are considered violations. Operating Unit Description Deviations Reported' Monitoring Was compliance Was Data Permit Unit Method per continuous or Continuous?' ID Permit?' intermittent?' Previous Current YES NO Continuous Intermittent YES NO E001 Landfill gas None None X X X emissions E002 Fugitive None None X X X particulate matter emissions General X None X X X Conditions Insignificant None None X X X Activities' If deviations were noted in the previous deviation report(i.e. for the first six months of the annual reporting period), put an "X" under"previous". If deviations were noted in the current deviation report(i.e. for the last six months of the annual reporting period),put an"X"under"current". Mark both columns if both apply. 2 Note whether the method(s) used to determine the compliance status with each term and condition was the method(s) specified in the permit. If it was not,mark"NO" and attach additional information/explanation. 3 Note whether the compliance status with each term and condition provided was continuous or intermittent. "Intermittent Compliance" can mean either that non-compliance has occurred or that the owner or operator has data sufficient to certify compliance only on an intermittent basis. Certification of intermittent compliance therefore does not necessarily mean that any non-compliance has occurred. The Periodic Monitoring requirements of the Operating Permit program rule are intended to provide assurance that even in the absence of a continuous system of monitoring the Title V source can demonstrate whether it has operated in continuous Operating Permit 97OPWE181 Page 1 of 2 C.Wr14WLF'NWLF Annual Compliance Certification 0411 doc Air Pollution Control Division Colorado Operating Permit Annual Compliance Certification Report compliance for the duration of the reporting period. Therefore, if a source 1) conducts all of the monitoring and recordkeeping required in its permit, even if such activities are done periodically and not continuously, and if 2) such monitoring and recordkeeping does not indicate non-compliance, and if 3) the Responsible Official is not aware of any credible evidence that indicates non-compliance, then the Responsible Official can certify that the emission point(s) in question were in continuous compliance during the applicable time period. 4 Note whether the method(s)used to determine the compliance status with each term and condition provided continuous or intermittent data. Compliance status for these sources shall be based on a reasonable inquiry using readily available information. IL Status for Accidental Release Prevention Program: A. This facility ❑ is subject ® is not subject to the provisions of the Accidental Release Prevention Program(Section 112(r)of the Federal Clean Air Act). B. If subject: The facility O is ❑ is not in compliance with all requirements of Section 1 12(r). I. A Risk Management Plan ❑ will be ❑ has been submitted to the appropriate authority and/or the designated central location by the required date. III. CERTIFICATION I have reviewed this certification in its entirety and, based on information and belief formed after reasonable inquiry, I certify that the statements and information contained in this submittal are true, accurate and complete. Please note that the Colorado Statues state that any person who knowingly, as defined in Sub- Section 18-1-501(6), C.R.S., makes any false material statement, representation, or certification in this document is guilty of a misdemeanor and may be punished in accordance with the provisions of Sub-Section 25-7 122.1, C.R.S. Brad Pollock Director of Landfill Operations Printed or Typed Name � Title i lirc \ 4-1Z - ZO11 Signature of Responsible Official Date Signed Note: All compliance certifications shall be submitted to the Air Pollution Control Division and the Environmental Protection Agency at the addresses listed in Appendix D of this Permit. Operating Permit 97OPWEI81 Page 2 of 2 C VvrW WLFW W LF Annual Compliance Certification 0411 doc 2400 West Union Avenue Englewood, CO 80110 303-914-1445(Phone) WASTE MANAGEMENT 866-442-0285(Fax) RECEIVED JUL 15 2011 Weld County Planning oapaflm@M July 13, 2011 GREELEY OFFICE Mr. Jerry Henderson Colorado Department of Public Health and Environment Hazardous Materials and Waste Management Division HMWMD-SWIM-B2 4300 Cherry Creek Drive South Denver, CO 80246-1530 Mr. Troy Swain Weld County Department of Public Health and Environment 1555 N. 17th Avenue Greeley, CO 80631 SUBJECT: NORTH WELD LANDFILL SECOND QUARTER 2011 GAS MONITORING REPORT Dear Mr. Henderson and Mr. Swain: Enclosed for your information is the Second Quarter 2011 Gas Monitoring Report for North Weld Landfill (NWLF). The report dated June 24, 2011 was prepared by AquAeTer and documents their field monitoring activities conducted on June 17, 2011. The gas monitoring report contains monitoring results from the Phase 1 and 2 perimeter soil gas probes GP-06, GP-07, GP-10 through GP-20, structure probes GP-01 and GP-02, inside the shop and office, and confined spaces in the vicinity of the western boundary of the site. A map showing the gas probe locations, the scale house and maintenance shop is included as Figure 1. Section 2.3.1 of the Regulations Pertaining to Solid Waste Sites and Facilities, 6 CCR 1007-2, Part 1 (Regulations) requires that the concentration of explosive gases shall not exceed (A) 25% of the lower explosive limit (LEL) (1% by volume in air for methane) within facility structures, and (B) the LEL (5% by volume in air for methane - i.e., percent methane) at the facility boundary. During this monitoring event, methane was detected in perimeter probe GP-10 at a concentration of 8.1% and in structure probe GP-01 at a concentration of 28.4%. Combustible gas above regulatory limits was not detected in any of the other probes, shop, office or confined spaces. The facility currently operates under an approved gas remediation plan prepared in response to elevated gas concentrations in structure probe GP-01 and perimeter probes GP-10 and GP-11. The plan includes monthly monitoring of these probes and utility corridor access points along WCR 25. Included in Attachment 1 are the April and May 2011 monthly reports. A summary of the test results for these monthly events is provided in the following table. ,2C// - O 57 5- tan MUD lath c4l F'� 0177 0-7/7420/I Letter Jerry Henderson and Troy Swain July 13, 2011 Page 2 CH4 Concentration Monitoring Probe April 2011 May 2011 GP-01 9.8 17.0 GP-10 10.7 29.2 GP-11 0.0 0.0 Methane was not observed in the utility corridor access points or facility structures during the monthly monitoring. The approved remediation plan also included the installation of passive gas vents in waste along the western limit of the disposal area. As stated in the plan, the passive vents, which were installed in December 2009, may require one or more years to show consistent reduction in methane concentrations at perimeter probes GP-10 and GP-11 and structure probe GP-01. Until methane concentrations are below the regulatory threshold for three consecutive monthly events, monthly monitoring will continue to be performed. Continuous methane monitors are in operation within the facility maintenance building, office and gatehouse and no methane detections have been observed. If you have any questions regarding this report, please contact me at (303) 914-1445. Sincerely, On behalf of North Weld Landfill Tom hweitzer Engineering Manager cc: Kim Ogle, WCDPS, w/o enc. Bill Hedberg, NWLF • Aq AA** r optimizing 7430 E.Caley Avenue, Ste 310 - Centennial, CO 80111 e Phone (303) 771-9150 - Fax (303) 771-8776 June 24, 2011 113320 Tom Schweitzer, Site Engineer Waste Management 2400 W. Union Avenue Englewood, CO 80110 RE: Transmittal of Second Quarter 2011 Landfill Gas Monitoring Report North Weld Landfill, Ault, Colorado Dear Mr. Schweitzer: This letter presents the results of second quarter 2011 landfill gas monitoring by AquAeTer, Inc., for the North Weld Landfill, in Ault, Colorado. Monitoring was done on June 17, 2011. This letter should be placed in the landfill operating record to document the monitoring event. BACKGROUND Methane monitoring for gas at perimeter gas probes and structures is conducted according to applicable State of Colorado regulations contained in Colorado Department of Public Health and Environment (CDPHE) 6 CCR 1007-2, Part 1 Hazardous Materials and Waste Management Division, effective December 30, 2008, Section 2.3, Explosive Gases. Methane content measured in the field is expressed as percent methane by volume in air. Methane is combustible and ignitable in concentrations ranging between approximately five and 15 percent (volume) in air. The lower explosive limit (LEL) is approximately equal to five percent (volume) methane in air. PROCEDURE During the second quarter 2011, landfill gas was monitored at landfill perimeter gas probes, confined spaces and structures. For gas probe monitoring AquAeTer followed the Waste Management Landfill Gas Probe Monitoring (Vadose Zone Monitoring) method. A Landtec GEM 2000 was calibrated in the field using calibration gas (a mixture of 50 percent methane, 35 percent carbon dioxide, and 15 percent nitrogen), and ambient (fresh) air. The field calibration was recorded in the field notebook, and a copy is retained with the sampling records. North Weld Landfill 113320 June 24, 2011 Page 2 1. At perimeter gas probes, subsurface gas concentrations were measured as follows. • Connect the instrument sample tube onto the gas probe's sample port. • Open the valve to take a pressure reading. • Operate the sampling pump through a carbon filter until readings stabilize and record the methane, oxygen, and carbon dioxide concentrations on the instrument display. 2. If stabilized, elevated methane concentrations are observed: • Bar Hole Probing (BHP) is performed, offset ten feet from the gas probe. • BHP is continued at ten foot intervals moving away from the waste footprint until a stabilized methane concentration of zero is obtained. 3. Measure methane, oxygen, and carbon dioxide concentrations inside on-site structures and confined spaces. Record the stabilized values observed. A table summarizing the monitoring results is included with this letter. RESULTS During the second quarter 2011 monitoring event, methane was detected in gas probe GP-01 and GP-10. Both probe GP-01 and GP-10 exhibited an elevated methane concentration that was more than five percent(volume) in air. Methane was detected in gas probes GP-01 and GP-l0 at a stabilized concentration of 28.4 and 8.1 percent (volume) in air, respectively, with a charcoal filter. Bar hole probing, as described in the Waste Management Landfill Gas Probe (Vadose Zone Monitoring) guide, confirmed that detectable methane was not present in the BHP made ten feet from either probe. Methane was not detected in any of the structures or confined spaces. The next regular quarterly monitoring at all gas probes and structures is scheduled to occur in September 2011. North Weld Landfill 113320 June 24, 2011 Page 3 If you have any questions pertaining to the landfill monitoring, please contact us by telephone at (303) 771-9150, by facsimile at (303) 771-8776, or by electronic mail at cstewart@aquaeter.com. Sincerely, AquAeTer, Inc. �J� .u� �a�MNyr S�lenn)-aJt� Terra Plute, E.I. Cathryn Stewart, P.G. Project Engineer Project Manager attachments: Landfill Gas Monitoring Results Table for Second Quarter 2011 (6/17/11) Well Condition Inspection Form (6/17/11) cc: Mr. Bill Hedberg, Senior District Manager Project# 113320 Task# 04 Sampler L.Major and T.Berry Date 6/17/2011 LANDFILL GAS MONITORING RECORD Name of Facility: North Weld Landfill Location (City,State): Ault, CO Date of Sampling Event: 6/17/2011 Barometric Probe Monitoring Depth to Total Time 1 CH4 Point Water(ft) Depth (ft) (24 hr) Pressure Pressure (in. (%) Filtered? (in. of Hg) of H2O) Gas Probes GP-01 NM 14.9 13:17 24.82 0.13 28.4 Y GP-01-BHP NA NA 13:36 24.82 NA 0.0 V GP-02 NM 14.4 13:48 24.82 0.04 0.0 Y GP-06 NM 60.9 10:08 24.79 0.02 0.0 V GP-07 42.04 42.8 13:39 24.82 0.00 0.0 V GP-10 NM 63.4 12:57 24.82 0.00 8.1 Y GP-10 BHP NA NA 13:06 24.82 NA 0.0 Y GP-11 38.83 51.3 12:18 24.82 0.00 0.0 Y GP-12 NM 39.3 12:08 24.82 -0.06 0.0 Y GP-13 NM 21.4 12:01 24.82 0.00 0.0 V GP-14 NM 45.1 11:51 24.82 0.00 0.0 V GP-15 NM 51.6 11:44 24.82 0.00 0.0 Y GP-16 DRY 42.6 11:36 24.82 0.00 0.0 V GP-17 NM 32.8 11:24 24.82 0.00 0.0 Y GP-18 NM 32.2 11:17 24.82 0.00 0.0 Y GP-19 NM 36.2 11:10 24.82 0.01 0.0 Y GP-20 NM 41.2 10:45 24,82 -0.01 0.0 Y Buildings and Confinded Spaces Old Scale House-Exterior 13:36 24.82 NA 0.0 Y Old Scale House-Interior 13:36 24.82 NA 0.0 Y Old Scale House-Confined space 13:37 24.82 NA 0.0 Y New Scale House 12:51 24.82 NA 0.0 Y Maintenance Shop-SE Corner 13:31 24.82 NA 0.0 Y Maintenance Shop-NE Corner 13:32 24.82 NA 0.0 Y Maintenance Shop-NW Corner 13:32 24.82 NA 0.0 Y Maintenance Shop-SW Corner 13:33 24.82 NA 0.0 V Valve Box 13:34 24.82 NA 0.0 Y Notes: All gas readings are 0-100%by volume in air NA-Not Applicable NM-Not Measured 1-Readings taken off Landtec GEM 2000. Not corrected to sea level. 2-Data from http://www.weatherunderground.com for 6/17/11 airport code KGXY Page 1 of 2 Project# 113320 Task# 04 Sampler L.Major and T.Berry Date 6/17/2011 Gas Instrument Brand: Landtec Model: GEM 2000 Serial No.: GM08087105 Rental No.: 07224 Date of Calibration: 6/17/2011 Calibrated by: RTB & LAM Cal. Gas Manufacturer: Intermountain Specialty Gases Lot No.: 41095-03 Expiration Date: 4/14 Calibration Gas: 50 %CH4 35 %CO2 Balance Nitrogen Accuracy: +/-2% Other: Sampling Personnel: Tyler Berry Company: AquAeTer, Inc. Sampling Personnel: Laura Major Company: AquAeTer, Inc. Pre-Monitoring Weather Conditions: Time: 10:55 Temperature: 69.8(°F) Wind: 9.2 mph from SE Barometric Pressure: 29.93 inches of Hg Weather Condition Observations(sun/clouds/pptn):_ Clear Weather Data from: ❑ Gas Instrument❑ On-Site Meteorology., Other(specify:Weather Underground2) Post-Monitoring Weather Conditions: Time: 2:15 Temperature: 80.6_(°F) Wind: 9.2 mph from SSW Barometric Pressure: 29.87_inches of Hg Weather Condition Observations(sun/clouds/pptn): Clear Weather Data from: ❑ Gas Instrument❑ On-Site Meteorology., Other(specify:Weather Underground2) Notes: All gas readings are 0-100%by volume in air NA-Not Applicable NM-Not Measured 1-Readings taken off Landtec GEM 2000. Not corrected to sea level. 2-Data from http://www.weatherunderground.com for 6/17/11 airport code KGXY Page 2 of 2 -d oa'o S c oar R 3 OH L-,'",, ~<o E B `� 0 3 d g i re III I I Oli ( \\, o __. . , 7 7 _ 4, . i , , , ,, . _ .. , , , _ , -- 0 1I I mo. 4 N U + \\ I i : ' \I. 1 -2,<„\r-r" 1 M \ \ , 1 ',kci.''' \ t A\ , , , , , .> I , , \\ _. ,, , j\, ,f.,.. . ? , ' \\, , „...,, ,,,i, , \______) N.,„ \\ , N A._ g , .1 -ki 1 \ a int '\ 1 ,.. (l a / ' aY e ' 1 �� `‘t .1 o � � f \ S "/ I d , ,a itl / d; o It / �o • WO O ea mu co ZenT co ..• ,p fN 1 ATTACHMENT 1 NORTH WELD LANDFILL APRIL AND MAY 2011 MONTHLY GAS MONITORING REPORTS • q• N N N N N -*I) C Y Y Y S v C LL ) EEEEE F• a a a a a C N N N N I,- a) m m m c') m E ❑ 22 5 CCD CCD CCD C07 CCD 0 0 0 0 0 C a a a a a E• a N N N N 2 T 25 5 22 — CD CD CD CD O t o C N 0 V V 'O V -o -o U U V "a V V V a y m m cy N -0 E N N N N N N N N N N N N N K O N E V O V O -Cr a G W W a N N N N N N N N E co 01 m a . 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E Co N N- n n a � x Co Co Cop Co Cop Cop Co Co Co Co Co co mac N N N N N W F p 8 8 a 8 D a V -Op 8 8 U a C O V 'C m m CO CD m m m m m 0 0 m m L O m 0 0 0 0 0 0 0 0 0 0 0 0 a cO H n g t,-m o m 0 0 m c w OI oO` IND 2., 4 V 2 '2 .I.3 'V O c a = 0 0 0 0 0 0 0 0 U' 0 0 0 a 0 N m r a N y y p N o et 0 0 > > > c y� 0 0 0 0 0 0 0 0 0 0 0 0 0 0 W d U T d n a N N "di N N E p N N N N N N N N N N N N N d ?• � .: (o o m m LL 2 2 2 2 2 2 F 2 555n222 2 n 2 2 2 2 2 2 2 2 a _' R o 3 = WWWWWWWWWWW W W O Q m z Z 2 Z Z a a a a a a a a a a a a a J I- U1 Z O co 9 CO o D D D D D 'L C DI D a D D D D 0 a D a D D E C N N W N N N O C 2l N N N W N N N N 2 W 2 N C `a m v v v v v m m v v v m v m m w d `) m " n N O it-: it LL LL EE y O LL U LL LL LL LL LL LL LL LL LL LL it LL a u =_ a N E r N o O o N N=D 0000000000 O O O N �>6 N O 6 O z>°a O O O O O O 6 O 6 6 6 O O N r O 26 �6 O I, N Cr 0 W 0 m 1- V m r Co m r N a, a in O Co N a N Co N N N N Co N N O O r m E m m m m o m E 0 6 0 0 0 0 0 0 0 o m O) s Iv a N r r E N N N N N E N N N N N N N N N (.0 N N N H N V] an m N H m N N N N in V1 0 U) N N N N O O C C C C C C Oi OI OI C C) C) C a o. 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Caley Avenue, Ste 310 0 Centennial, CO 80111 Phone (303) 771-9150 ° Fax (303) 771-8776 July 13, 2011 113320 RECEIVED Mr. Douglas Ikenberry, P.E. Colorado Department of Public Health and Environment JUL 1 8 2011 Hazardous Materials and Waste Management Division Weld County Planning Department HMWMD-SWIM-B2 GREELEY OFFICE 4300 Cherry Creek Drive South Denver, Co 80246-1530 Mr. Troy Swain Weld County Department of Public Health and Environment 1555 N. 17th Avenue Greeley, Co 80631 Subject: North Weld Landfill (NWLF) 2011 Groundwater Monitoring Plan Update Dear Mr. Ikenberry and Mr. Swain: On behalf of Waste Management Disposal Services of Colorado, Inc. (WMDSC), AquAeTer encloses the updated text and corresponding pages to the Groundwater Monitoring Plan (GWMP) for NWLF. This plan was updated pursuant to Development Standard#8 of the Weld County Certificate of Designation. This Development Standard requires the plan to be reviewed at least once every two years. The GWMP was previously reviewed, updated and submitted to the Colorado Department of Public Health and Environment (CDPHE) and Weld County Department of Public Health and Environment(WCDPHE) on June 8, 2009. The GWMP has been reviewed and modified by NWLF with only minor plan updates/revisions as required since the May 2009 plan submittal. Based on a May 23, 2011 telephone conversation and June 17, 2011 meeting between CDPHE and WMDSC, it is our understanding that the primary change to the 2011 Plan is to reflect the background monitoring status for shallow zone well MW-9. In anticipation of landfilling in the vicinity in the future, well MW-9 is reinstated to active background monitoring. It is WMDSC's intent in 2012 to provide a comprehensive revision of the Groundwater Monitoring Plan that will incorporate previous updates into a streamlined document. The 2011 GWMP updates include responding to comments received on the May 2007 Plan Update (CDPHE letter dated February 2, 2010) and May 2009 Plan Update (CDPHE letter dated etinfin/l/C/O17(4-7Y) 2O//- /5" 'J7/257// fL O 7 7 7 ( e . \l__ , PL l - � -4- II • Mr. Douglas Ikenberry 113320 July 13, 2011 Page 2 February 3, 2010), as described below. Please note that the GWMP updates have been reviewed by a professional geologist, per your February 2, 2010 request. 1. Changed the front cover page of the Updated Groundwater Monitoring Plan to reflect the 2011 update. 2. Updated the Revision Summary page to document the updates, including correcting the date of the CDPHE letter that addresses the May 2009 Plan revisions. 3. Updated the List of Tables page to update Table 1-1, Monitoring Well Network, to reflect the re-activated status of monitoring well MW-9; and to re-insert Table 5-2, Monitoring Sample Collection, Preservation, and Holding Times (per CDPHE February 3, 2010 request). 4. Updated the List of Drawings page to delete and replace Drawing No. 2-17 (Phreatic surface of Perched Groundwater) with revised drawing No. 2-17R(Extent of Shallow Sand and 2011 Cross-Section Location Map), and to add Drawing Nos. 2-17R-A, 2-17R- B, and 2-17R-C (Shallow Sand Cross-Sections A-A', B-B', and C-C'). 5. Updated the List of Appendices page to update the contact information in Appendix 4, Directory, and to indicate that Appendix 8, STL Denver Laboratory Quality Manual, has been deleted and the replacement TestAmerica Quality Assurance Program (QAP) document is available for review upon request made through WMDSC. 6. General Text Edits: • Section 1.2: Corrected the location information to R 66 West. • Section 1.4.2: Updated information regarding restarting background data collection at well MW-9. • Section 2.2.2: Updated information referencing revised drawing No. 2-17R(Extent of Shallow Sand and 2011 Cross-Section Location Map) and Drawing Nos. 2-17R-A, 2-17-RB, and 2-17R-C (Shallow Sand Cross-Sections A-A', B-B', and C-C'). • Section 2.3: Revised hydrogeology language, added "Shallow Sand Hydrogeology", and updated Section 2.3.5 with additional groundwater wells within one mile of the site. • Section 2.3.4: Updated information regarding likely recharge of surface water to shallow sands. • Section 3.1: Updated information regarding commencement of background data collection at well MW-9. • Section 3.3: Updated information regarding well MW-9 re-development that occurred in May 2010. • Section 3.4: Updated information regarding the status of MW-9 as referenced in the well inspection program. Mr. Douglas Ikenberry 113320 July 13, 2011 Page 3 • Section 5.1.2: Updated information regarding the order of filling sample bottles in lieu of"unfiltered then filtered." • Section 5.1.4: Updated information regarding the collection of unfiltered samples only, and updated the reference to Table 5-2, Monitoring Sample Collection, Preservation, and Holding Times (per CDPHE February 3, 2010 request). • Section 5.5.5: Added a clarifying phrase to the final paragraph, to indicate that the person relinquishing the samples has signed, dated and sealed the chain-of-custody in the field, which is then unsealed, signed, and dated by the laboratory personnel taking custody of the samples (per CDPHE February 3, 2010 request). • Section 6.0: Updated the schedule for sampling MW-9 and statistical analysis after the collection of eight sets of data, and for a minimum of two years prior to waste placement (per CDPHE February 3, 2010 letter). The final two sentences of this paragraph were deleted, and the preceding sentence was updated for planned cell construction. • Section 7.1: Modified the text to indicate that the updated Test America Laboratories, Inc. (TAL) Quality Assurance Program (QAP)document is available upon request from WMDSC (per CDPHE February 3, 2010 letter). The QAP is updated and maintained under the control of TAL. Please replace the entire text (Sections 1 through 9); Tables 1-1 and 5-2; Drawing Nos. 2-17R, 2- 17R-A,2-17R-B,and 2-17R-C;and Appendix 4,which have been revised as described above,with the enclosed text and corresponding pages. If you have any questions concerning these revisions, please contact either Tom Schweitzer(303- 914-1445), Bill Hedberg (970-686-2800 ext. 23), or either of the undersigned (303-771-9150). Sincerely, �� 1 Cathryn Stewart. C.P.G. Steve Wample P E. Project Manager Technical Director Enclosure cc: Kim Ogle, WCDPS, w/o enc. Lou Bull, WM Bruce Clabaugh, WM (cover letter only) Bill Hedberg, WM Brad Pollock, WM (cover letter only) Tom Schweitzer, WM V 111111111111. 2400 West Union Avenue Englewood, CO 80110 303-914-1445(Phone) WASTE MANAGEMENT 303-914-9937 (Fax) June 16, 2011 Mr. Douglas Ikenberry Solid and Hazardous Waste Program 4300 Cherry Creek Drive South Denver, CO 80246-1530 Mr. Troy Swain Weld County Department of Public Health and Environment 1555 N. 17th Avenue Greeley, CO 80631 Subject: North Weld Landfill (NWLF) Phase 3a Module 2 Cell Construction Dear Mr. Ikenberry and Mr. Swain NWLF is planning to construct the referenced disposal cell during the 2011 construction season. The basic construction elements include cell excavation, construction of a two-foot thick compacted soil liner, placement of a six-inch thick drainage layer, and construction of a leachate collection system consisting of a leachate drain line and temporary leachate collection sump. Enclosed for your information are the following documents: • Construction Plans for Phase 3a Module 2—April 20, 2011 • Technical Specifications for Phase 3a Module 2 Liner Construction— May 2011 • North Weld Landfill Liner System Construction Quality Assurance Plan—Revised May 2011 The project is generally consistent with the approved NWLF Design and Operations Plan, Site Development Plans, and CQA Plans, including any subsequent approved amendments. For constructability and to improve function of the leachate collection system, we made the following minor adjustments while maintaining conformance with base grade slope/leachate travel time requirements and specified material thicknesses; • Minor realignment of the boundary between Phase 3a and future Phase 3b • Shifting future permanent leachate collection sump 3a approximately 80 feet to the west and its base elevation from 5042.37 feet (msl) to approximately 5040.37 feet. • Shifting future permanent leachate collection sump 3b approximately 120 feet to the south its base elevation from 5045.43 feet to approximately 5043.21 feet. These adjustments are shown on the accompanying Drawing 1. As presented in the June 2011 update to the NWLF Groundwater Monitoring Program and reviewed with Mr. Douglas Ikenberry and Mr. Roger Doak of CDPHE during a meeting on November 10, 2010, groundwater monitoring well MW-5 will continue to serve as the downgradient monitoring point for sump 3a and groundwater monitoring well MW-9 will continue to serve as the downgradient monitoring point for sump 3b. alMNI-02n( Jncic- - ao//9'15 o7/ spew ,oZ D'l77 RECEIVED Mr. Douglas Ikenberry and Mr. Troy Swain June 16, 2011 JUN 371111 Page 2 Weld Cou T: a department GREELEY OFFICE We are currently going through the contractor selection process and mobilization for the cell construction project is anticipated to begin around mid-July. We currently expect completing the work by October 28. Should you wish to visit the site during construction, please do not hesitate to contact Bill Hedberg or me. Sincerely, On behalf of North Weld Landfill Tom Schweitzer, P.E. Engineering Manager Enclosures Cc: Bill Hedberg, NWLF Kim Ogle, Weld County Planning Department I TECHNICAL SPECIFICATIONS for PHASE 3a — MODULE 2 LINER CONSTRUCTION I WASTE MANAGEMENT DISPOSAL SERVICES OF COLORADO, INC. NORTH WELD LANDFILL I I I c^� ' =� eo24176L = T oi � , ;/ON/It -\\ May 2011 I I I SPECIFICATIONS GENERAL TABLE OF CONTENTS PAGE NO. ISECTION 02222 - GENERAL EXCAVATION, BACKFILL AND STOCKPILING 1 1.01 SUMMARY 1 I 1.02 DEFINITIONS 1 2.01 MATERIALS 2 3.01 PREPARATION 2 I 3.02 EXCAVATION 2 3.03 MATERIAL PLACEMENT 3 3.04 FIELD QUALITY CONTROL 4 ISECTION 02246- GRANULAR DRAINAGE MATERIAL 1 I 1.01 DESCRIPTION 1 1.02 PROJECT/SITE CONDITIONS 1 2.01 GRANULAR BLANKET MATERIAL 1 I 3.01 FILL USAGE 2 3.02 PREPARATION 2 3.03 FIELD QUALITY CONTROL 2 SECTION 02247- CLAY LINER 1 1.01 DEFINITIONS 1 1.02 REFERENCES 1 1.03 QUALITY ASSURANCE 2 1 1.04 PROJECT/SITE CONDITIONS 2 2.01 ON SITE CLAY 2 3.01 EXAMINATION 2 I 3.02 EQUIPMENT 3 3.03 PREPARATION 3 3.04 EXCAVATION 3 I 3.05 CLAY MATERIAL PLACEMENT 4 3.06 INTERPHASE/INTERMODULE SEPARATION BERM CONSTRUCTION 5 3.07 FIELD QUALITY CONTROL 5 I SECTION 02300-LINER TIE-IN 1 1 1.01 DESCRIPTION \�nk"Pp0!Iitu RE��''�i,,, 1 2.01 MATERIALS �z. p�..;.... .S1 1 3.01 CONSTRUCTION ri• s 1 1 3.02 FIELD QUALITY CONTROL *.1. O 1 .0 24O �:/I Phase 3a—Module 2 Liner Construction **di. BONA pltt rth Wef Contents ld Landfill IMay 2011 i C:IDwvn;mis and Scmngshschwei1N15 Orenmc,tlsnrvtlau\Cone Projcis'L;;ndfllsNWLF Ph3a Mod1NWIF.PMx 3a MM2 TechSpecs for COPHE 115.1011 dcc I I SECTION 02500-LEACHATE COLLECTION SYSTEM 1 1 1.01 DESCRIPTION I 2.01 MATERIALS I 3.01 STAKING 2 I 3.02 GRADES 2 3.03 BACKFILL 2 3.04 SURVEY CONTROL 2 SECTION 02560- TEMPORARY LEACHATE COLLECTION SUMP 1 1.01 DESCRIPTION 1 2.01 MATERIALS 1 3.01 PLACEMENT 1 I 3.02 STAKING 2 3.03 OPENING SUMP 2 I 3.04 GRADES 2 I SECTION 02700-PROTECTIVE LAYER 1 1.01 SUMMARY 1 1.02 DEFINITIONS I I 2.01 MATERIALS I 3.01 PREPARATION 1 3.02 MATERIAL PLACEMENT 1 I 3.03 FIELD QUALITY CONTROL 2 I SECTION 15077- GEOTEXTILE FABRIC 1 1.01 SUMMARY 1 2.01 GEOTEXTILE FABRIC 1 I 3.01 INSTALLATION I 3.02 FIELD QUALITY CONTROL I I ,„„„l ,i ��o`o�p00 REOIS, I ..� STI •. c�' $ tot ti 24176 �: ./i7II 0NAI� �``��\ I ITable of Contents Phase 3a—Module 2 Liner Construction North Weld Landfill I May2011 ii C novnems and SmunyoVschx'eiLM\Decvmemsmvdate\Cann Pcojms.tandolls\N WLF P?n MMTNWLF-Pbzm 3a MM 3 Techspxs fm CDPI@ OS 2011 doe I I I I I I I DIVISION 2 1 SITE WORK I I 1 1 1 M I I I SECTION 02222 - GENERAL EXCAVATION, BACKFILL AND STOCKPILING I PART 1 GENERAL I 1.01 SUMMARY A. Section Includes: 1 1. Excavation to achieve design subbase grades. 2. Placement and compaction of general soil fill for sidewall embankments to achieve Idesign subbase grades or for other areas as designated on the plans. 1 1.02 DEFINITIONS A. Unsuitable Material: 1 1. Topsoil, peat, organic soils, and materials containing slag, cinders, foundry sand, debris, and rubble, or soil with less than required bearing capacity as determined by 1 CQA CONSULTANT. B. Classification: Soil excavated to reach the excavation grades as shown on the plans shall I be incorporated in the project or placed in stockpiles based on the following classifications: 1. Cohesive Soils Stockpile: Cohesive Soils stockpile shall consist of fine grained I cohesive soil/claystone excavated from the project boundaries described above. This soil shall meet the requirements for cohesive soil material. This material shall be excavated from the overburden cohesive soils. I 2. Topsoil Stockpiles: Topsoil stockpiles shall consist of topsoil and vegetation excavated from the project boundaries described above. 3. Random Fill Stockpile: Random fill stockpile shall consist of soil and bedrock Iexcavated from the project boundaries described above. This soil does not meet the requirements for cohesive soils stockpile. 4. Drainage Blanket Material Stockpile: This stockpile shall consist of sand and/or Igravel or other permeable material classified as SW, SP, GW or GP and meets requirements for drainage blanket materials (Section 02600). I 5. Granular Material Stockpile: The granular material stockpile shall consist of the most coarse grained material excavated from overburden sandy soils or sandstone bedrock below the overburden soil. IPART 2 PRODUCTS IGeneral Excavation,Backfill and Stockpiling Phase 3a-Module 2 Liner Construction North Weld Landfill May 2011 PAGE 02222-1 IC:\Dmunents and ScnmgstlschoxiMl,Documcnis\nrytlau\Cona Projects-Iandflls\NWLF Phln Mod2W WLF-P ase la MW 2 TechSrecs for COFFEE 05-1011 doc i 1 2.01 MATERIALS A. General Soil Fill: 1. Subsoil free of wood, peat, stones larger than 6 inches in any direction, or other unsuitable materials. PART 3 EXECUTION 3.01 PREPARATION A. Proof-roll embankment surface with a smooth drum roller, or other equipment deemed suitabme by OWNER, to identify areas of soft material. Determination of soft areas will be based on OWNER'S judgment, but generally detected by soil deflection of greater than 2 1 inches and accompanied with stress cracks in soil when rolled over by heavy construction equipment. Remove unsuitable material and replace with general soil fill. 3.02 EXCAVATION A. Excavate within limits of Project to lines, grades and elevations shown. B. Segregate excavated materials as either topsoil, granular material, gravelly soils, clayey soils,random soils or unsuitable materials. Do not mix materials. C. Transport excavated materials to the project or designated stockpile areas. D. Dewatering 1. Maintain surface water control and free drainage. 2. Provide surface water pumps, hoses and other necessary equipment and labor to Ikeep excavation free of standing water. E. Over-excavate to remove unsuitable material as directed by OWNER. F. Maintain dust control. G. OWNER may, at its option, perform excavation with the project boundary using a CAT 627 scraper. OWNER will provide CONTRACTOR load counts of excavation performed by OWNER's scrapers within the project area. Excavation performed by OWNER at a rate of 17 cubic yards per load will be deducted from the CONTRACTOR's final survey quantities. I General Excavation,Backfill and Stockpiling Phase 3a—Module 2 Liner Construction North Weld Landfill I May 2011 PAGE 02222-2 C`Documents and salingslschx'eiMly Dacumenlsvmdata\Cona Projects-Landfills\NWLF Ph5a MM]W WLF-0M1ase is MW 2 Tchspca for CDPIa 05-2011 do I 3.03 MATERIAL PLACEMENT A. Embankment 1. Begin construction of embankment at lowest point of fill below grade and construct in layers by spreading and leveling material during placement. The area to be filled shall be free of vegetation, or any other materials or soils considered by the CQA CONSULTANT to be unsuitable. Spread individual layers to uniform thickness throughout and approximately parallel with finished grade for full width of embankment. 2. Place general soil fill materials uniformly in 12-inch loose lifts across full width of embankment. 3. Compact general soil fill materials at or above optimum moisture and meet minimum of 95%of standard Proctor across full width of embankment before placing next lift. 4. Maintain lifts to provide positive drainage away from construction. 1 5. Do not place materials such as stumps, logs, brush or other unsuitable materials in embankment. 6. Do not block or obstruct roads, streets, or pavements with excavated materials, except as authorized by OWNER. 7. Schedule Work in coordinated effort with OWNER. A. Stockpile Construction 1. Any stockpiles constructed shall be located as directed by the Owner. Material 1 placed in all stockpiles shall be placed in layers not exceeding 12 inches. The completed stockpile surfaces shall be bladed to prevent ponding of surface water. The completed stockpile slopes shall be track walked and no steeper than 3:1 (Horizontal: Vertical) slope. 2. Watering shall be performed during all stockpiling to control dust. 3. No stockpiling shall begin until the Contractor's Surveyor has provided construction staking for the stockpiles, if required. I ' General Excavation,Backfill and Stockpiling Phase 3a—Module 2 Liner Construction North Weld Landfill May 2011 PAGE 02222-3 C Documents and Saungslsch¢aoA)Documents\on tla\Cons\Pmjens-Landfills\NWLF Phia ModTNWLF-Phase la Mod 2 TechSpcs for CDPHE n5 201 I dcc I 1 3.04 FIELD QUALITY CONTROL IA. Excavation tolerances for slopes,module base and ditches: 1. Grade: -0.2 to +0.0 foot. 1 2. Line: ± 0.2 foot. B. Completed excavation grades shall be surveyed by CONTRACTOR and inspected by I OWNER'S representatives prior to fill placement. Any grades exceeding the tolerances will be reworked and resurveyed at CONTRACTOR'S expense. C. Completed embankment grades shall be surveyed by CONTRACTOR and inspected by OWNER'S representatives. Any grades exceeding the tolerances will be reworked and Iresurveyed at the CONTRACTOR'S expense. I *** END OF SECTION *** I I I I I 1 I I IGeneral Excavation,Backfill and Stockpiling Phase 3a—Module 2 Liner Construction North Weld Landfill May 2011 PAGE 02222-4 IC'Doc nmam'and Semnyg6ch'c10My Oocun,cnlslmydau\Cona Projects-Landfills\NWLP Ma Mod2W WLP-Phasc la Mod 2 Techspccs for COPT@ 05-2011 doc as asSECTION 02246 - GRANULAR DRAINAGE MATERIAL PART I GENERAL 1.01 DESCRIPTION This item shall consist of furnishing, hauling and placing a six (6) inch thick drainage layer on a ■ prepared subgrade in accordance with these specifications and in conformity with the lines, grades, thickness and typical cross sections shown on the plans. It is anticipated that the CONTRACTOR will obtain the granular drainage material from off-site sources as approved by the CQA CONSULTANT. CONTRACTOR shall submit sieve analyses results for the proposed material to the CQA CONSULTANT prior to procurement. Granular material is currently stockpiled on-site but its fines content may be too high to meet the permeability requirements specified for the drainage layer. At its option, the CONTRACTOR may evaluate the stockpiled material and consider options such as screening to render it suitable for drainage layer material. Should CONTRACTOR wish to use the on-site material, CONTRACTOR shall provide as a separate bid item, a unit cost for using the on-site material. Whether an off-site or on-site source is used, all materials are subject to approval by the CQA CONSULTANT who shall determine • the suitability of the material to be placed for the sand drainage layer. 1.02 PROJECT/SITE CONDITIONS A. Do not block or obstruct roads, streets or pavements except when authorized by OWNER. B. Schedule Work in coordinated effort with OWNER and other contractors. a PART 2 PRODUCTS • 2.01 GRANULAR BLANKET MATERIAL A. Clean sands classified according to Unified Soil Classification System as SP. r 1. Grain Size: 100% passing 1/2 inch size sieve and less than 5% passing No. 200 sieve. Material gradation may vary provided that testing confirms the material meets permeability requirements. 2. Permeability: 0.01 cm/sec or greater. 3. Calcium Carbonate: No more than 15%. a . Granular Drainage Material Phase 3a—Module 2 Liner Construction North Weld Landfill May 2011 PAGE 02246-1 C:Inmimenu and 9mingsgxhweiI'M imenlslmydali\Cmul Projects-LandrillsNWLP PP)aModnOWLF-Phase 3a Mod E TxhSpxs for COPHE 05-1011 doc r I rPART 3 EXECUTION 3.01 FILL USAGE A. Granular Blanket Material: 1. A sand layer over the base liner in accordance with plans. 2. No blanket material shall be placed until the top of the clay liner has been inspected and approved by the OWNER. 3.02 PREPARATION A Surface Water Control: ' 1. CONTRACTOR is responsible for surface water control within project limits. 2. Keep construction and excavation areas well drained and minimize surface water ponding. B. Subsurface dewatering not permitted without OWNER'S written permission. 3.03 FIELD QUALITY CONTROL A. Granular blanket materials shall have a minimum thickness of 1.0 foot with a tolerance from the design grade of the top of the drainage layer of: ' 1. Grade: -0.0 to +0.2 foot. 2. Line: ±0.2 foot. B. Completed material grades/thicknesses shall be surveyed by CONTRACTOR and inspected by OWNER. Any grades outside of the tolerance will be reworked and resurveyed at CONTRACTOR'S expense. *** END OF SECTION *** I ' Granular Drainage Material Phase 3a—Module 2 Liner Construction North Weld Landfill May 2011 PAGE 02246-2 C Documents and Scaingatschv.eaM,Dontmentsumdau\Const Projects IaM60iNWLF PNa Modl'NWLF-Plan la Mod]Taa5lccs for CDPIE nSHp I doc I SECTION 02247 - CLAY LINER 1 PART1 GENERAL 1.01 DEFINITIONS A. Lift: I. One layer of clay material placed in loose lifts and compacted to thickness specified. 1.02 REFERENCES 1 A. American Society for testing and Materials (ASTM): ' 1. ASTM D422-63 - Standard Method for Particle Size Analysis of Soils. 2. ASTM D1140-54 - Standard Test Method for Amount of Material in Soils Finer ' than No. 200 (75 urn) Sieve. 3. ASTM D1557-78 - Standard Test Methods for Moisture Density Relations of Soils and Soil Aggregate Mixtures Using 10 lb. (4.54 kg) Rammer and 18 inch (457 mm) Drop. 4. ASTM D1587-83 - Standard Practice for Thin Walled Tube Sampling of Soils. 5. ASTM D2216-80 - Standard Test Method for Laboratory Determination of Water ' (Moisture) Content of Soil Rock, and Soil Aggregate Mixtures. 6. ASTM D2487-85 - Standard Test Method for Classification of Soils for Engineering Purposes. 7. ASTM D2922-81 - Standard Test Method for Density of Soil and Soil Aggregate in Place by Nuclear Methods(Shallow-Depth). ' 8. ASTM D3017-88 - Standard Test Method for Water Content of Soil and Rock in Place by Nuclear Methods (shallow-Depth). 9. ASTM D4318-84 - Standard Test Method for Liquid Limit, Plastic Limit and Plasticity Index of Soils. ' 10. ASTM D5084-90 - Standard Test Method for Measurements of Hydraulic Conductivity of Saturated Porous Materials Using Flexible Wall Perimeter. iClay Liner Phase 3a—Module 2 Liner Construction North Weld Landfill May 2011 PAGE 02247-1 C Nwumw¢and Sciringe4schweiMlp aacumemscydam\Ccnsi Pmjens-Lendfills\NWlP PlOa MMEW WLP-PM1sss 3a Mad 3 TechSpeco fm CNPIW 0S2UI I aw I I1.03 QUALITY ASSURANCE A. OWNER will perform quality assurance in accordance with the North Weld Landfill Liner System Quality Assurance Plan(copy provided herein). I 1.04 PROJECT/SITE CONDITIONS I A. Do not block or obstruct roads, streets, or pavements with excavated materials, except as authorized by OWNER. IB. Schedule Work in coordinated effort with OWNER and other CONTRACTORS. PART 2 PRODUCTS 2.01 ON SITE CLAY A. Properties: 1. Permeability: 1 x 10"7 cm/sec or less (ASTM D5084). 1 2. Grain Size: P200 content 50%by weight or greater(ASTM D422). I3. Liquid Limit: Greater than or equal to 25% (ASTM D4318). 4. Plasticity Index: Greater than or equal to 10%(ASTM D4318). I5. Free of stones and inclusions of other soil types larger than three inches in largest dimension. I6. Non-organic soil classified as CL or CH by Unified Soil Classification System. 1 8. Compaction: 95% Standard Proctor dry density or greater(ASTM D698). 9. Moisture content: 0%to 4%above optimum (ASTM D698). I10. Degree of saturation: Greater than or equal to 80% on or above the line of optimums. ' PART 3 EXECUTION I 3.01 EXAMINATION A. Proof roll and examine surfaces to receive fill and subgrades within limits of excavation to determine existence of soft areas, areas loosened by frost action or softened by flooding, I weather or of unsuitable materials. IClay Liner Phase 3a—Module 2 Liner Construction North Weld Landfill May 2011 PAGE 02247-2 I C'Documcnts and Settings\IshweitMy Documcros6mdata\Cnnat Projects-landfills\NNLF Ph3a Mod2W WLF-Phase la Mod 2 TechSpc s for COPHE OS-2011 dcc I I 1. Determination of soft areas will be based on OWNER'S judgment, but generally detected by soil deflection of greater than 2 inches and accompanied with stress cracks in soil when rolled over by heavy construction equipment. 3.02 EQUIPMENT A. Caterpillar 825C (Caterpillar 815 on liner sideslopes) or CQA CONSULTANT approved equivalent tamping foot compactor for liner placement. B. 36-inch diameter disc or CQA CONSULTANT approved equivalent to properly mix and break the clay and claystone. C. Suitable earth moving and watering equipment. 3.03 PREPARATION A. Remove or replace material not meeting Specifications, natural soils or compacted fill softened by frost, flooding or weather. B. Do not excavate within influence zone of existing footings or foundations, or similar structures such as monitoring wells without prior approval of OWNER. ' C. Provide minimum 3-day notice to OWNER before placing clay. D. Surface Water Control. ' 1. CONTRACTOR is responsible for surface water control within construction limits throughout construction including work by other Contractors. 2. Keep construction site well drained and minimize surface water ponding. 3. Comply with OWNER'S discharge criteria. 3.04 EXCAVATION A. Excavate to elevations and dimensions necessary to complete construction. B. Do not over-excavate to remove unsuitable material without OWNER'S approval. iC. Do not excavate for other structures until scheduled for construction. D. Upon completion of excavation, CONTRACTOR will document grades for OWNER'S inspection before CONTRACTOR proceeds with further Work. Documentation will be in accordance with OWNER'S Site Specific Quality Assurance Plan. Clay Liner Phase 3a-Module 2 Liner Construction North Weld Landfill May 2011 PAGE 02247-3 C\Documents and SetungSlxhuci(M5 Doowoants4n,data\Cmm Protects-Landflls\N WLF Phia Mcd2W WLF Phase la Mod 2 TCM5µcs for COPHE 05-101 I doc I E. Protect excavated areas from freezing and water damage. 3.05 CLAY MATERIAL PLACEMENT A. Do not place clay until subbase is certified by CONTRACTOR's Surveyor and approved by OWNER. B. Shape subgrade to provide specified clay thickness smooth and free from loose stones. C. Placement: Scarify and moisture condition previous surface prior to placement of succeeding clay lifts. 1. Place in 8 inch loose lifts. 2. Maximum Compacted Lift Thickness: 6 inches but not greater than the depth of the compactor teeth. 1 3. Tolerance: Maximum acceptable variation for each lift thickness is 1 inch. ' 1. Remove all stones and similar material greater than 3 inches in diameter. D. Compaction: 1. Minimum Compaction: 95% of dry density, ASTM D698 standard Proctor. 1 2. Maximum Permeability: 1 x 10-7 cm/sec, ASTM D5084 laboratory falling head permeability test. 3. Compaction Moisture Content: 0 to +4% wet of optimum as determined by ASTM D698 standard Proctor testing. 4. Degree of Saturation: At least 80% of all measurements to have a degree of saturation on or wet of the line of optimums (approximated by the degree of saturation corresponding to the optimum moisture content determined by standard (ASTM D698) Proctor testing). E. Material distribution and gradation throughout liner shall be such that material is free from lenses, pockets, streaks or layers of material differing substantially in texture or gradation from surrounding material. Prevent sand or other soil types from mixing into clay or forming seams. I Clay Liner Phase 3a—Module 2 Liner Construction North Weld Landfill May 2011 PAGE 022474 C Documents and SGungstlschxemM3 Docnmemsan,dala\Consl Projects-Landfills\NWLF PRin Mod2N WLF-Phasc 3a MW 2 TealSpacs far CDPHE 05-2011 doc F. Uniformly distribute moisture and disc each lift of clay material prior to compaction. Wet clay material that is too dry to permit compaction of liner at proper moisture content. Do not place clay liner at a moisture content less than optimum as defined by ASTM D698. No additional payment will be made for drying or wetting clay liner materials. G. Place layers of clay to form continuous monolithic material. Condition excessively dry or wet soil before placement of additional lifts. Knead each lift into previously placed lift with tamping foot compactor, or similar kneading type compactor. H. Construct sidewall liners in lifts parallel to side slope or by other acceptable methods as approved by OWNER. I. CONTRACTOR to protect completed clay liner from cracking resulting from desiccation or freeze/thaw action. Cracking observed in the liner surface shall be repaired by the ' CONTRACTOR at no cost to the OWNER. J. Do not place clay that is frozen or when the previous surface is frozen. Do not place clay when air temperatures are below 32°F, unless CONTRACTOR can demonstrate the fill material and previous surface temperatures can be kept above freezing. K. CONTRACTOR shall place clay to minimize ponding of water on clay liner surface. 3.06 INTERPHASE/INTERMODULE SEPARATION BERM CONSTRUCTION A. No placement of separation berm shall be made until: 1. OWNER has inspected placement of the granular drainage blanket and all necessary record documentation has been obtained. 2. Berm alignment is inspected by OWNER. B. Clay liner materials shall be used to construct the berms. Geotextile fabric shall be placed on the drainage layer prior to placing clay for the berm. Moisture conditioning shall be performed as necessary. Construction methods shall be similar to those employed for the clay liner except that the initial lift shall be 12 inches to prevent damage to the underlying geotextile and drainage layer. 3.07 FIELD QUALITY CONTROL A. Survey: 1. The CONTRACTOR shall employ measures to the satisfaction of the OWNER that demonstrate each in-place lift is constructed to the specified thickness. Clay Liner Phase 3a—Module 2 Liner Construction North Weld Landfill May 2011 PAGE 02247-5 C\Documme and Settings\tschwcii My Oocumcnts\mdala Cons(Projects Landfills W WLF Phia Mod2W WLF-Phese it Mod TTahSpca for CDPHE OS-2011 tlm I 2. Finished surface of clay shall have a minimum thickness of 2 feet and top of clay shall have a tolerance of-0.0 to +0.1 foot of the design grades. Any grades outside of the tolerance will be reworked and resurveyed at CONTRACTOR'S expense. B. Testing: ' 1. Perform soil testing to determine characteristics of base soils prior to construction of clay liner. 2. Clay testing will be performed throughout Project by OWNER to monitor clay parameters and assist CONTRACTOR in selection of appropriate material for liner construction. 3. CONTRACTOR to assist OWNER in obtaining soil samples. 1 4. Testing frequencies for construction quality assurance are defined in Table 1 of the Site Specific Quality Assurance Plan. Test locations shall be selected at random by OWNER'S representatives. 5. Rework lifts that fail to meet field density or moisture testing. Rework includes: ' a. Define rework area. b. Disc. ' c. Moisture condition. d. Compact. e. Re-test. Notify OWNER when reworked area is ready for re-test. Prior to discing area to meet density requirements, CONTRACTOR may consider compacting rework area first. ' Reworked areas that fail re-testing shall have lift or material removed and replaced at no cost to OWNER. *** END OF SECTION *** I ' Clay Liner Phase 3a—Module 2 Liner Construction North Weld Landfill May 2011 PAGE 02247-6 C soacumaus and SdtingClschooiMly Docmems'ytlma\Cons(Ps%Ws-LtlMfillsW WLF PNa MME\MPIF-Phase la Mod E TahSpa5 for COPHE 05-1011 doc 1 ' SECTION 02300 - LINER TIE-IN PART 1 GENERAL ' 1.0 DESCRIPTION This item shall consist of completing the tie-in of the clay liner (Section 02247), the leachate collection system (Section 02500) and the drainage layer (Section 02246) between Phase 1 Modules 2 and 3 and Phase 2 Modules 3 and 4. No tie-in work shall occur until the clay liner and leachate collection system are completed as determined by the OWNER and CQA CONSULTANT. PART 2 PRODUCTS 2.01 MATERIALS A. The materials to be used are those described in Section 02247 —Clay Liner, Section 02500— Leachate Collection System and Section 02246— Granular Drainage Materials ' PART 3 EXECUTION 3.01 CONSTRUCTION A. Construct tie-in as shown on the Plans. ' B. Excavate the compacted module separation berm and compacted soil block as shown on the Plans between Phase 3a Module 2 and existing Phases 2 and 3. ' C. Excavate a portion of the Phase 3a Module 1 temporary leachate sump berm as show on the plans. To the extend practical, remove the sump gravel material and other sump components for use in the Phase 3a Module 2 temporary leachate sump. D. Following removal of the module separation berm and Phase 3a Module 1 temporary leachate sump berm, bench the existing exposed clay liner and construct clay liner tie-in. CQA CONSULTANT to inspect and approve benching and clay liner tie-in prior to placement of overlying granular drainage material and protective cover. ' E. Granular drainage material and protective cover shall be placed over the completed clay liner tie-in as shown on the Plans. 3.02 FIELD QUALITY CONTROL A. CQA CONSULTANT to confirm the Work conforms to installation specifications and ' Plans. *** END OF SECTION *** ' Liner Tie-In Phase 3a—Module 2 Liner Construction North Weld Landfill May 2011 PAGE 02300-1 CDocnmcros and Scilly;tlsh.cit\MJ Decvmcros.nydata\Cons1 Psojeds-LaM6115WWLF Phia MMPMVLFPhase is Mod 2 TechSpecs for CDPHE 115-IIII I drc r I SECTION 02500 - LEACHATE COLLECTION SYSTEM ' PART 1: GENERAL ' 1.01 DESCRIPTION: A. The leachate collection system consists of a gravel drain line composed of gravel drainage material wrapped in geotextile fabric. This work includes, but is not limited to ' procurement, placement of approved gravel drainage and geotextile materials. All work shall be done in strict accordance with these specifications and in conformance with the dimensions, typical sections, lines and grades shown on the plans. B. Section 2560 of these specifications describes the requirement for the temporary leachate collection sump. r PART 2: PRODUCTS 2.01 MATERIALS: ' A. Drainage Gravel Material: Gravel drain lines shall consist of rounded, semiangular or angular clean gravel or other permeable material. ' 1. Unified Soil Classification: GP 2. Permeability: Equal to or greater than 1 cm/sec ' 3. Gradation: Zero to five percent passing the 3/8-inch sieve; have a D50 less than the 1.5-inch sieve; have a minimum of 99% and passing the 3-inch sieve. The material gradation may vary from the above if testing confirms the material meets permeability requirements. 4. Free of foreign matter, lumps or excessive amounts of clay and other objectionable or foreign substances. ' B. Geotextile Fabric: The gravel drain lines shall be wrapped in nonwoven geotextile fabric as per the plans. This fabric shall have a mass per unit area equal to or greater than 10 oz./sq.yd. The OWNER shall provide the geotextile. tLeachate Collection System Phase 3a—Module 2 Liner Construction North Weld Landfill May 2011 PAGE 02500-I C\Omomrn\s and Sgnngs\lsclmcif.M.l Cecumems'ydala\Cons(Projects-LjM611sNWLF Phla Mod2W WLF-Plisse la Mod 2 TechSpecs for COPHE OS-201 I doc 1 PART 3: EXECUTION 3.01 STAKING: ' The CONTRACTOR's Surveyor will establish the location of the work by means of the construction grid provided by OWNER. It shall be the CONTRACTOR's sole responsibility to lay out the work from plan dimensions and grid, and to transfer elevations from construction stakes as ' necessary. 3.02 GRADES: ' A. The low points that form the grade break in the cohesive soil liner along the leachate collection gravel drain alignment shall be to within-0.00 to +0.10 ft. of the lines and grades shown on the plans. Any area below grade shall be brought to grade at the 1 CONTRACTOR's expense, with cohesive soil layer material. Grades shall be smooth without humps or sags. ' B. The CQA CONSULTANT shall be notified with reasonable notice in advance when a section is ready for installation of the leachate collection gravel drainage line. CQA CONSULTANT at that time will make a determination as to the suitability of the area and ' will give notice to the CONTRACTOR to proceed or repair deficient areas. 3.03 BACKFILL: ' A. Drainage gravel lines shall include the placement of specified materials in the geotextile fabric. No placement shall commence until the area has been inspected and approved by the CQA CONSULTANT. The drainage gravel shall be filled to the level of 12 inches above ' the top of the cohesive soil layer, as shown on the drawings or as otherwise approved by the CQA CONSULTANT. B. The CONTRACTOR shall place the drainage gravel along the drain line in a manner, which will not damage the geotextile. 3.04 SURVEY CONTROL: The surveyor shall survey the final location and elevation of the leachate collection gravel drain lines and shall make particular note of ending locations of collection lines to allow for future tie-in to be performed. ' ** END OF SECTION ** I ' Leachate Collection System Phase 3a—Module 2 Liner Construction North Weld Landfill May 2011 PAGE 02500-2 C D nents and SnungaschweiMl5�nienlsiydate\Cons(Projects-LoMfllsNWLF Phla MM2NWLF-Phase la Mod 2 TechSpss for COPHE 05-NII doe I 1 SECTION 02560 - TEMPORARY LEACHATE COLLECTION SUMP PART 1: GENERAL ' 1.01 DESCRIPTION: The leachate collection sump consists of excavation, furnishing, hauling and placement of bedding, vertical riser pipe, geotextile fabric, and removal or disposal of materials as necessary. This work includes, but is not limited to, excavation to design grades and placement of approved bedding or backfill materials. All work shall be done in accordance with these specifications or as shown on the drawings. PART 2: PRODUCTS 2.01 MATERIALS: A. Liner per Section 02247—Clay Liner ' B. 18-inch diameter HANCOR Landfill Grade or equivalent riser pipe including end cap placed on a 3' x 3' x 1" HDPE sheet. The lower 6.5 feet of the riser pipe shall be ' perforated (5/8" diameter perforations) and the upper 9 feet of the riser pipe shall be solid wall with a removal end cap. Alternative perforations may be considered provided the open area per lineal foot of pipe does not decrease. To the extent practical, portions of ' the riser pipe from the Phase 3a Module 1 Temporary Leachate Sump, may be reused for the new sump. ' C. Geotextile per Section 15077—Geotextile Fabric. Geotextile to be provided by OWNER. D. Rock backfill — Gradation: 1-1/2 to 3 inch (in longest dimension) rounded, semi-angular ' to angular gravel with less than 5% fines (minus the No. 200 sieve). The CONTRACTOR shall submit sieve analysis and laboratory test results for the proposed rock backfill for approval by the CQA CONSULTANT prior to procurement. To the extent practical, the gravel material pipe from the Phase 3a Module 1 Temporary Leachate Sump, may be reused for the new sump. PART 3: EXECUTION ' 3.01 PLACEMENT: Liner construction: Construct per Section 02247—Clay Liner ' Riser Pipe: Install 18-inch vertical riser pipe as shown on Plans Geotextile Fabric: Install per Section 15077—Geotextile Fabric. Temporary Leachate Collection Sump Phase 3a—Module 2 Liner Construction North Weld Landfill May 2011 PAGE 02560-1 C'Documents and Smung,lutxcil\M.DocomenmMsdam\Conn Projects-Landfhs`NWLF Phla MWN:WLF-Phase le MME icchSpccs for CDPHE 5e-2011 dec I Rock Backfill: Rock backfill shall be placed carefully around the riser pipe such that it is not unequally loaded or displaced during backfill placement. 3.02 STAKING: A. No excavation shall be made until the CONTRACTOR's Surveyor has set stakes outlining the installation. B. The CONTRACTOR's Surveyor will establish the location of the work by means of offset stakes, if applicable, and will indicate the depth of cut when required. It shall be the CONTRACTOR's sole responsibility to lay out the work from plan dimensions or offset stakes and to transfer elevations from construction stakes as necessary. 3.03 OPENING SUMP: The sump shall be opened in accordance with the lines and grades given for the work, at such times ' and as far in advance of the work as may be required by the OWNER. 3.04 GRADES: A. The bottom of the sump (top of cohesive soil layer) shall be excavated to within-0.0 to +0.1 ft. at the lines and grades shown on the plans. Any portion of the sump excavated below grade shall be returned to grade at the CONTRACTOR's expense, with clay liner material. ' Grades shall be smooth without humps or sags. B. The CQA CONSULTANT shall be notified with reasonable notice in advance when the ' sump has been excavated and is ready for placement of the geotextile filter fabric. The CQA CONSULTANT at that time will make a determination as to the suitability of the excavation and will give notice to the CONTRACTOR to proceed or remove additional material. ** END OF SECTION ** ' Temporary Leachate Collection Sump Phase 3a—Module 2 Liner Construction North Weld Landfill May 2011 PAGE 02560-1 C Vhvwnenu'and Settings\IUM1weitMv Davmenls\mvdala\Conn Projects-IandfllsMWLF Ph3a Mo@W WLF-Plmse 30 Mod 2 TmhSpccs for COPIE VS-NI1 doc I SECTION 02700-PROTECTIVE LAYER PART I GENERAL ' THIS SECTION IS NOT APPLICABLE TO THIS PROJECT AS THERE IS NO REQUIREMENT FOR A PROTECTIVE LAYER 1.01 SUMMARY A. Section includes: 1. Hauling and placement of protective layer soil above the clay liner on the side slopes to achieve design grades. ' 1.02 DEFINITIONS A. Unsuitable Material: 1. Topsoil, peat, organic soils, and materials containing slag, cinders, foundry sand, ' debris, and rubble, or soil with less than required bearing capacity as determined by ENGINEER. ' PART 2 PRODUCTS 2.01 MATERIALS ' A. Protective Layer Soil: 1. Stockpiled materials as described in Section 02200 and approved by ENGINEER. ' CQA CONSULTANT will designate which stockpiles will be used for the protective layer soil. PART 3 EXECUTION 3.01 PREPARATION ' A. The protective layer shall be placed where designated on the plans or as directed by the CQA CONSULTANT. 3.02 MATERIAL PLACEMENT ' A. The method of placement of the protective layer shall not cause rutting or any decrease of thickness of the clay liner. The CQA CONSULTANT prior to commencing the work shall approve all placement procedures. ' B. The protective layer shall be formed of satisfactory materials with a lifts thickness of not less than six (6) inches in loose depth. ' Protective Layer Phase 3a-Module 2 Liner Construction North Weld Landfill ' May 2011 PAGE 02700-1 C\Daumrn6 and Settings\Ischx'e't\My DocnmenlnMcdala\cons)Pmjccls-L,.ndfills'.NNLF Ph]a MMl\N WLF-Phase 3a Mod E Techsrecs fm CD@�(153011 dx I C. The grading operations shall be conducted, and the soil strata placed to produce a soil structure as shown on the typical cross section or as otherwise specified. All material ' shall be free of organic matter such as leaves, grass, roots and other objectionable material. ' D. Operations on earthwork shall be suspended at any time when satisfactory results cannot be obtained because of rain, freezing weather, or other unsatisfactory conditions of the field. E. Schedule Work in coordinated effort with OWNER. Do not block or obstruct roads, streets, or pavements with excavated materials, except as authorized by OWNER. ' 3.03 FIELD QUALITY CONTROL A. Tolerances for protective layer soil: 1. Grade: -0.0 to+0.2 foot. ' 2. Line: ± 0.2 foot. ' B. Completed grades shall be surveyed by CONTRACTOR and inspected by OWNER'S representatives prior to acceptance. Any grades exceeding the tolerances will be reworked and resurveyed at CONTRACTOR'S expense. *** END OF SECTION *** 1 ' Protective Layer Phase 3a—Module 2 Liner Construction North Weld Landfill May 2011 PAGE 02700-I C\Documents and SellingSlxhweit'M Denmlcll¢Imydata\Cone Projects-Landfalls\NWLF Phla MWE\NWLF-Phase la Mod E lechSpecs for CDPHE 05-201i dcc I I I I I I I I DIVISION 15 I MECHANICAL I I I I I I I I SECTION 15077 - GEOTEXTILE FABRIC PART 1 GENERAL ' 1.01 SUMMARY A. This item pertains to geotextile fabric used to enclose the leachate collection gravel drain line and in the interphase/module separation berms and temporary leachate sump. B. Payment: Work specified in this section is considered incidental and cost shall be included as part of appropriate unit prices specified in bid form. PART 2 PRODUCTS 2.01 GEOTEXTILE FABRIC A. OWNER will provide geotextile fabric for the module separation berms. ' PART 3 EXECUTION 3.01 INSTALLATION A. Install material as shown on the Plans and in accordance with manufacturer's written ' instructions. B. Surface on which fabric is to be placed shall be smooth with no sharp projections. C. Fabric to be placed as smooth and wrinkle free as practical without "stretching". D. All laps shall be at least 24 inches in width and secured until backfill is placed. E. Prior to covering, the fabric shall be inspected and approved by CQA CONSULTANT. ' F. The geotextile shall be free of tears, holes, other visible damage or wrinkles. t G. CONTRACTOR shall replace any sections of fabric that are ripped or torn during the CONTRACTOR's placement of fabric and subsequent materials. Repairs shall be made to the satisfaction of the CQA CONSULTANT. 3.02 FIELD QUALITY CONTROL ' A. CQA CONSULTANT to confirm installation and necessary repairs comply with installation specifications and Plans. *** END OF SECTION *** ' Geotextile Fabric Phase 3a—Module 2 Liner Construction North Weld Landfill ' May 2011 PAGE 15077-1 C'Documents and Scvin651tnchueoN1 Documents\rmdnia\roost Projects-Landfllsd WLF Phia Mod3WWLF-Plane la Mod 2 TechSpccs for COPUE(15-2011 da I I I I I NORTH WELD LANDFILL ' LINER SYSTEM CONSTRUCTION QUALITY ASSURANCE PLAN Revised May 2011 I I � `p0 I EG/sl `oc ` TIA%�s• F 6 PO 24176 9 //V O V ALF-\k‘ 'Vet,e4 �lit I I I I I TABLE OF CONTENTS I1.0 INTRODUCTION 1 1.1 Project Background 1 I1.2 Purpose and Scope 1 1.3 Construction Schedule 1 I2.0 PROJECT PERSONNEL AND CONTACTS 1 I 2.1 Director of Landfill Operations (Project Sponsor) 1 2.2 District Manager 2 2.3 Project Manager 2 2.4 Certifying Design Engineer 2 I2.5 Certifying CQA Engineer/CQA Consultant 2 2.6 Site Surveyor 2 2.7 Colorado Department of Public Health and Environment 2 1 2.8 Weld County Department of Public Health and Environment 3 2.9 General Contractor(Owner/Superintendent) 3 2.10 Soils Quality Assurance Laboratory 3 I 3.0 CONSTRUCTION MEETINGS 3 1 3.1 Preconstruction Meeting 3 3.2 Project Progress Meetings 3 1 4.0 DOCUMENTATION 3 4.1 Standard Reporting Procedures 3 I 4.2 Applicable Forms 4 4.3 Colorado Department of Public Health and Environment Notification 4 4.4 Issue Identification and Corrective Action 4 I 4.5. Photographic Documentation 5 4.6 Site Survey Requirements 5 I5.0 LANDFILL CONSTRUCTION CONTROL-EARTHWORK 7 5.1 Construction Quality Assurance for Subbase 7 1 5.1.1 Subbase Preparation 7 5.1.2 Leachate Collection Drain Line 7 5.2 Construction Quality Assurance for Cohesive Soil Liner 7 1 5.2.1 Construction Requirements 7 5.2.2 CQA Testing ,ipinl upi!f�ii 8 5.2.3 CQA Sampling \ �\d .. J I"„� .:. 8 5.2.4 CQA for the Protective Layer „Sn:q,' �^' 9 5.2.5 CQA for the Module Separation Ber ` . . i W...9 _ ;0 24176 F. _ '/.; uu�tt ` 10 \\\\� I Revision 6- May 2011 i I I6.0 CONSTRUCTION CONTROL- LEACHATE COLLECTION DRAIN LINE 9 6.1 Construction Quality Assurance for Leachate Collection System 9 I 6.1.1 Leachate Collection Drain Line Construction 9 6.1.2 Geotextile Fabric 10 6.1.3 Leachate Collection Drain Gravel 10 6.1.4 Granular Blanket QA Sampling 10 I6.1.5 Granular Blanket Documentation 1 1 6.1.6 Permanent and Temporary Leachate Collection Sumps 11 I7.0 FINAL CONSTRUCTION DOCUMENTATION REPORT 11 TABLE 1 Construction Quality Assurance Testing and Frequencies I APPENDIX A Typical Table of Contents I I I I I I I \:\,\,d1 11 F' u1111 z:-. cgpS rlAry•. F4) le 24176 LL -o eo „• %4.14\et I I IRevision 6-May 2011 ii I I NORTH WELD LANDFILL CONSTRUCTION QUALITY ASSURANCE PLAN REVISION LOG DATE DESCRIPTION OF REVISION BY 12/10/04 Revise Tie-in Language on Page 11 MEM 04/29/05 Revise survey requirements in Section 4.6 MEM 12/14/07 Updated to include 60-mil HDPE liner at permanent sumps, decreased the MEM tolerance for survey lines from ±0.5 foot to +0.2 foot, added record survey control for protective layer 03/07/08 Incorporated CDPHE comments from letter dated February 15, 2008. LRC 1 04/16/10 Miscellaneous edits TSS 5/26/11 Miscellaneous edits TSS I I I 1 I I I I I I Revision 6-May 2011 iii ' 1.0 INTRODUCTION 1.1 Project Background The North Weld Landfill (NWLF), which is owned and operated by Waste Management Disposal Services of Colorado, Inc., is located in Weld County, Colorado. NWLF is a 170-acre facility, which was originally approved June 27, 1990. The site first received waste on February 3, 1992. ' This Construction Quality Assurance Plan (CQAP) outlines the documentation activities for the remainder of liner construction in Phase 2 and Phases 3a and 3b. Previous CQAPs have been prepared separately for Modules 1-5 of Phase I and Module 1 of Phase 2. This CQAP applies to all liner development within the phases described above and is intended to eliminate preparation of separate CQAPs for each liner project. The activities outlined in this CQAP will serve as the basis for the preparation of construction observation reports documenting work performed for each of the remaining liner projects in Phases 2, 3a, and 3b. ' 1.2 Purpose and Scope The construction activities associated with each liner project at NWLF include: • Excavation and stockpiling of soil from within the project area including appropriate drainage control and stormwater areas; • Installation of a 2-foot thick cohesive soil liner; • Installation of a leachate collection system; ' • Installation of a 6-inch thick sand drainage blanket over the liner base and a 6-inch thick protective layer over the liner sideslopes; • Installation of cohesive soil phase separation berms around the base liner. • Installation of permanent or temporary leachate collection sumps. 1.3 Construction Schedule A Construction Quality Assurance (CQA) staff and construction schedule is to be included as an appendix to the construction documentation report. 2.0 PROJECT PERSONNEL AND CONTACTS 2.1 Director of Landfill Operations (Project Sponsor) ' Name: Brad Pollock Address: Colorado Landfill Division 5500 South Quebec, St. Suite 250 Greenwood Village, CO 80111 Phone No.: (303)486-6040 Fax No.: (303) 914-1588 Revision 6—May 2011 1 i2.2 District Manager Name: Bill Hedberg Address: North Weld Landfill 40,000 Weld County Road 25 Ault, CO 80610-9748 Phone No.: (970) 686-2800 Fax No.: (970) 686-1031 2.3 Project Manager Name: Tom Schweitzer Address: Waste Management of Colorado 2400 W. Union Ave. Englewood, CO 80110 Phone No.: (303) 914-1445 Fax No.: (866) 442-0285 2.4 Certifying Design Engineer Name: To be determined for each construction project 1 Address: Phone No.: Fax No.: 2.5 Certifying CQA Engineer/CQA Consultant ' Name: To be determined for each construction project Address: Phone No.: Fax No.: 2.6 Site Surveyor Name: To be determined for each construction project Address: Phone No.: ' Fax No.: 2.7 Colorado Department of Public Health and Environment ' Name: Douglas Ikenberry Address: HMWMD-SWIM-B2 1 4300 Cherry Creek Drive South Denver, CO 80246-1530 Phone No.: (303) 692-3389 Fax No.: (303) 759-5355 1 Revision 6—May 2011 2 1 2.8 Weld County Department of Public Health and Environment ' Name: Troy Swain Address: 1555 N. 17th Avenue, Greeley, CO 80631 Phone No.: (970)304-6415 Fax No.: (970) 304-6411 2.9 General Contractor(Owner/Superintendent) Name: To be determined for each project Address: Phone No.: ' Fax No.: 2.10 Soils Quality Assurance Laboratory iName: To be determined for each project Address: Phone No.: Fax No.: 3.0 CONSTRUCTION MEETINGS 3.1 Preconstruction Meeting Prior to the start of liner construction a meeting shall be held involving the General Contractor, District Manager, Project Manager, the Site Surveyor and the CQA Consultant. ' The Pre-Construction Meeting Agenda, which identifies parties, documents, lines of communication and requirements, etc. The minutes of the meeting, shall be included as an appendix to the construction documentation report. 3.2 Project Progress Meetings Generally, project progress meetings will be conducted on a weekly basis (prior to I completion of the cohesive soil liner) with the General Contractor, CQA Consultant, District Manager, the Project Manager, and the Site Surveyor (as necessary). These meetings will include updates to the activity schedule, a summary of work activities, testing results, discussion of any necessary decisions regarding construction activities, project requirements and schedule for the up coming week. If necessary, a brief daily meeting with the above- parties will be conducted to address any critical construction matters and determine an ' acceptable course of action. The CQA Consultant shall maintain a file containing notes from such meetings and a copy of the notes shall be provided to the Project Manager. 4.0 DOCUMENTATION 4.1 Standard Reporting Procedures ' The CQA Consultant shall issue a daily report of construction activities. These reports shall contain, at a minimum, the following information: 1. Date, project name, location, weather and other information as appropriate. Revision 6—May 2011 3 t2. Description and locations of ongoing construction. ' 3. Equipment used. 4. Description of areas tested and sampled. 1 5. Description of areas requiring reconditioning, retesting and procedures followed. 6. Summary of clay moisture at time of placement and lift thickness. 7. Surveys performed for lift thickness control and any record surveys performed for trench, piping and stone grades. 8. Description of any variations from approved design and justification for the variance. 4.2 Applicable Forms The forms to be used in documenting the daily activities consist of the following: 1. Telephone Memorandum 2. Daily Field Report 3. Request for Information 4. Field Density Test Report 5. Soil Sample Test Request Record ' 6. Soil Testing Tracking Log Prior to the preconstruction meeting, the CQA Consultant shall provide the Project Manager with samples of these forms for review and approval. All completed daily report forms shall be bound separate from the CQA report and copies shall be kept in the NWLF and at the CQA Consultant's files. 4.3 Colorado Department of Public Health and Environment Notification All contact with the Colorado Department of Public Health and Environment and the Weld County Department of Public Health and Environment will be the responsibility of and conducted by the Project Manager or designate. 4.4 Issue Identification and Corrective Action ' The CQA Consultant is required to inform the Contractor, in a timely manner, of any difference between the interpretation of the plans and specifications by the Contractor versus the CQA Consultant interpretation. In addition, any actual or suspected work deficiencies ' shall be brought to the attention of the Project Manager. If a difference in interpretation cannot readily be resolved between the General Contractor and CQA Consultant, a meeting shall be held involving the District Manager, Project Manager, General Contractor, and CQA Consultant. If the issue involves a possible design Revision 6—May 2011 4 1 modification, the Design Engineer may be contacted. The meeting shall define and discuss the issue, review alternative solutions, and implement an action plan to resolve the issue to ' the satisfaction of all parties. If a field modification is required which affects a permit condition or a regulatory requirement, the Colorado Department of Public Health and Environment and, if necessary, ' the Weld County Planning Department and Weld County Department of Public Health and Environment shall be contacted to inform them of the design change. The discussion with the agencies will confirm their concurrence with the need for a field modification and what documentation they require. The conversation shall be documented by the Project Manager including completing a field ' modification form and phone memo documenting the discussion and verbal concurrence with the state and local agencies. ' Applicable forms shall be included in an appendix to the report. 4.5. Photographic Documentation Photographs (indicating date of exposure) shall be taken with a date back camera to document observations, and as-built conditions of all elements of construction. These photos will be labeled to identify, at a minimum, date, location where photo was taken, direction, ' and a brief description of the photo. The photographs will be captioned and compiled in a photograph album in chronological order by the CQA Consultant. Copies of the album shall be kept in the NWLF and CQA Consultant's files. 4.6 Site Survey Requirements Site survey requirements include performing record surveys. At a minimum, the record survey will be performed on a 50-foot grid pattern on the subbase and base area. The record survey confirms that the landfill liner was constructed in accordance with the approved design grades. The record survey to be performed by the Contractor's Surveyor will include: ' 1. Subgrade record survey a. Subbase on a 50'x 50' grid. Subsequent floor layers including cohesive soil liner and drainage layer shall be certified at the same horizontal locations as the subgrade. b. All subgrade breaklines, as appropriate, on 50' centers. c. Edge of the subgrade/cohesive soil liner interface for the existing liner on 50' centers. d. Center line/toes of the perimeter drainage channel on 50' centers. ' 2. Top of compacted cohesive soil liner and protective layer(i.e. where applicable) a. 50' x 50' grid. The certification grid shall be the same grid used for the ' certification of the subgrade. b. All breaklines, as appropriate, and edges on 50' centers. c. Top of edge where liners are tied together on 50' centers. Revision 6—May 2011 5 I ' d. Certification staking will be performed along mid slope points for the protective layer on side slopes. 3. Leachate collection drain line and permanent/temporary sump a. Subbase at 50 ft. intervals along the leachate collection drain line. ' b. Top of compacted cohesive soil liner along the leachate collection drain line at 50 ft. intervals. c. Survey stationing used for certification of the subgrade and top of cohesive soil liner and protective layer (i.e. where applicable), shall be at the same horizontal locations for each layer. Each design point along the 1 50' stationing will have two or three associated elevations — subgrade and top of cohesive soil liner and protective layer(i.e. where applicable). d. The permanent/temporary leachate sump shall have a cross section surveyed perpendicular to the alignment of the leachate collection drain line. Each survey location on the cross section shall have a certification for the subgrade and top of cohesive soil liner. 4. Finished grades ' a. Top of drainage layer on 50' grid. This certification shall use the same grid used for the certification of the subgrade and top of cohesive soil liner. Thickness of the 6-inch drainage layer shall be summarized in a table and included in the documentation report. Thickness of the drainage layer shall be verified using a calibrated probe. Depth locations shall be shown on a plan view drawing and included in the documentation report. 1 b. All finished breaklines, as appropriate, toes and tops of slopes on 50' centers The CQA Consultant shall reference all test and sample points and reconstructed areas by measuring from reference points established for the on-site coordinate system. All survey data will be reduced at the end of each day and given to the CQA Consultant in ' the form of a report. All surveying notes will be recorded in a field book and kept in the CQA Consultant's field files. The record grade tables to be used in the field and the final documentation report to document compliance with design criteria shall be included in an appendix to the report. Tolerances for excavation and fill areas(at subgrade) shall be as follows: 5. Slopes: Line: ±0.2 foot Grade: -0.2 to+0.0 feet 6. Module Base: Line: ±0.2 foot Grade: -0.2 to+0.0 feet 7. Soil liner: The cohesive soil liner shall have a minimum thickness of 2.0 feet with a tolerance of -0.0 to +0.1 feet of the design grades for the top of the cohesive soil liner. I Revision 6—May 2011 6 1 ' 8. Protective layer: The protective soil layer shall be constructed to a tolerance of —0.0 to +0.2 feet of the top of design grade for the top of the protective layer as ' shown on the plans. The protective soil layer shall be constructed so that the combined thickness of the protective layer and clay layer is 2.5 to 2.8 feet perpendicular to the slopes. 1 9. Sand drainage layer: The granular drainage layer shall have a minimum thickness of 0.5 feet. 1 5.0 LANDFILL CONSTRUCTION CONTROL - EARTHWORK 5.1 Construction Quality Assurance for Subbase 1 5.1.1 Subbase Preparation Construction Quality Assurance for subbase preparation involves monitoring grade control as stated in Section 4.6. In addition, the subbase area is monitored for unstable areas. Unstable areas that are excavated and other over-excavated areas may require controlled fill. This fill shall be placed in compacted lifts not exceeding 12 inches. Field density testing shall be performed on this fill on a 50-foot grid pattern for each 12 inch lift placed to assure a minimum density ' of 95% of standard Proctor. A representative sample of the subbase fill soils will be used to determine a standard Proctor value for maximum density and optimum moisture content of the soils. In the event the fill soils change, standard proctor values shall be determined for each soil type. Clay surface soils along the previous cell shall be removed, providing for a clean ' "key-in" between cells during clay placement. 5.1.2 Leachate Collection Drain Line While constructing the subbase, the chevron pattern will be graded to form the leachate collection drain line. The leachate collection drain line is shown on the plans. ' As discussed in Section 4.6, the Contractor's Surveyor will perform survey documentation of the construction of the leachate collection drain line. ' Field density testing and clay sampling for quality assurance will be performed during liner and drain line construction as discussed in Section 5.2. 5.2 Construction Quality Assurance for Cohesive Soil Liner ' 5.2.1 Construction Requirements The cohesive soil liner shall be constructed in accordance with design criteria of the North Weld Landfill Design and Operations Plan. ' 1. Base grades shall be consistent with approved design grades. The minimum leachate collection drain line slope shall be 2%. 2. The minimum thickness of the cohesive soil liner at all locations shall be at least 1 2 feet measured perpendicular to the liner surface. Revision 6—May 2011 7 I ' 3. The clay-lined base and interior sidewall at all locations shall be constructed in lift heights no greater than 6 inches after compaction but no greater than the depth of the compactor teeth. 4. The typical side slopes shall not exceed 3 horizontal to 1 vertical. The cohesive soil will be placed in approximately 8-inch loose lifts. A 36-inch (minimum) diameter disc will be used to break up the clay clogs, expose stones in clay to allow for removal and to assist in raising the moisture content to approximately 0 to 4 percent above ' optimum moisture content as determined by Standard Proctor test (ASTM-D698). Compaction will be performed using a Caterpillar 825 (Caterpillar 815) tamping foot compactor or equivalent. The number of passes required to achieve the minimum 95 percent ' compaction will be determined during the first lift of cohesive soil placement, and monitored on subsequent lifts. ' 5.2.2 CQA Testing Density testing of Cohesive soil liner shall be performed randomly but on a density equivalent to a 100 foot grid pattern for each 6 inch compacted thickness of liner placed. ' For sidewalls, minimum testing requirements are determined based on the surface area of the sidewalls. ' The testing grid pattern shall be offset on each subsequent lift. Additional density tests shall be obtained in confined areas where equipment movement is hindered or hand compaction is necessary. The number of density tests shall be recommended by the CQA Consultant based ' on the size of the confined area and shall be approved by the Project Manager. If areas are encountered which do not meet the specified moisture content, percent compaction or percent saturation, the area will be reworked; moisture conditioned and recompacted as ' necessary. Retests will be performed following the rework activities. Each penetration made into the cohesive soil liner for density testing purposes shall be ' repaired after testing. The test hole shall be repaired by backfilling the test hole with bentonite and hydrated or other material approved by the CQA Consultant. All density tests will be reported on the field density forms. Test locations will be presented ' on the plan view for cohesive soil liner tests and sample locations. Completed field density forms shall be included in an appendix to the report. Prior to the preconstruction meeting, the CQA Consultant shall provide the Project Manager with a sample of the field density form for review and approval. 5.2.3 CQA Sampling The material used to construct this liner shall conform to the following specifications: Classification: CL or CH under the Unified Soil Classification System ' Permeability: Less than or equal to lx 10' cm/sec or less Density: Greater than or equal to 95% (ASTM D 698) Liquid Limit: Greater than 25 percent Plasticity Index: Greater than 10 percent Saturation (%) Greater than or equal to 80% Grain Size P200 content of 50% or greater by weight I Revision 6—May 2011 8 ' Cohesive soil samples shall be obtained during liner construction for the following tests: 1. Grain Size ASTM D422/1140 (excludes hydrometer) 2. Atterberg Limits ASTM D4318 3. Moisture Content ASTM D2216 4. Standard Proctor ASTM D698 5. Permeability ASTM D5084 The ASTM designations and sampling frequencies for the above tests are shown on Table 1. ' Note: Each Shelby tube sample must have a minimum length of 4 inches. Each void remaining after extracting the undisturbed sample will be backfilled with bentonite and hydrated. Shelby tube sample locations will be presented on the plan view. A soil sample inventory log will be maintained as samples are acquired. Prior to the preconstruction meeting, the CQA Consultant shall provide the Project Manager with a ' sample of this inventory log for review and approval. All completed inventory logs shall be included in an Appendix to the report. ' 5.2.4 CQA for the Protective Layer A 6-inch soil protective layer shall be placed over the cohesive soil-lined sideslopes. ' The material shall consist of cohesive soil liner material or random material described in the Project Technical Specifications. The protective layer shall be placed in successive lifts of not more than eight inches in loose depth. Compaction operations shall consist of at least ' three passes with suitable equipment or until the CQA Consultant is satisfied with the compaction. The CQA Consultant shall observe and report on appropriate CQA test results and observe/report on placement operations to verify uniform lift thickness, proper layer bonding, adequate compaction and appropriate moisture conditions. 5.2.5 CQA for the Module Separation Berms ' Cohesive soil liner materials shall be used to construct the berms. Moisture conditioning shall be performed as necessary. Berm material, located above the permanent liner, which will be removed during future construction will not be subjected to permeability testing. ' 6.0 CONSTRUCTION CONTROL - LEACHATE COLLECTION DRAIN LINE ' 6.1 Construction Quality Assurance for Leachate Collection System 6.1.1 Leachate Collection Drain Line Construction ' When the 2-foot cohesive soil liner is completed the gravel drain line composed of gravel drainage material wrapped in geotextile fabric will then follow as discussed in this section. I Revision 6—May 2011 9 6.1.2 Geotextile Fabric The geotextile fabric used to wrap the leachate collection trench shall be 10 oz. non-woven geotextile. Placement shall be performed as shown on the Plans and shall conform to the following: ' 1. Fabric to be placed smooth and wrinkle free as possible without"stretching". 2. The gravel drain lines shall be wrapped in geotextile fabric as per the plans. ' 3. Fabric shall overlap at all seams by at least 2 ft. ' CQA requirements for the fabric are: I. Fabric shall be free of tears, holes, other visible damage or significant folds or wrinkles. i2. Geotextile quality control certificates shall be included in an appendix to the construction documentation report. ' 6.1.3 Leachate Collection Drain Gravel The drainage gravel material used in the collection drain shall consist of rounded, ' semiangular or angular clean gravel or other permeable material, which meets the following requirements: ' 1. The gravel material will be classified according to the Unified Soil Classification System as GP poorly graded gravel. 2. Zero to five percent passing the 3/8 inch sieve; have a D50 less than 1.5 inch sieve; have a minimum of 99% passing the 3-inch sieve; 3. Permeability≥ lcm/sec. ' 4. The drainage material shall be placed as shown on the plans. ' The types of testing, ASTM designations and sampling frequencies for the leachate collection drain gravel are shown on Table 1. 6.1.4 Granular Blanket QA Sampling The granular blanket for the North Weld Landfill consists of a minimum of 6 inches of sand placed over the cohesive soil liner. The drainage blanket requirements are as follows: ' 1. Grain Size: 95% passing 1/2 inch sieve and less than 5% passing #200 sieve. (additional specifications are included in the Technical Specifications). 2. Permeability≥ 1x10-2cm/sec. The types of testing, ASTM designations and sampling frequencies for the granular blanket are shown on Table 1. The CQA Consultant will document sample locations. Revision 6—May 2011 10 I ' 6.1.5 Granular Blanket Documentation The CQA Consultant shall record thickness of the 6-inch thick granular drainage blanket on a 50' grid pattern. Thickness of the drainage layer shall be verified using a calibrated probe. The sand blanket depth documentation shall be summarized in a table and included in the ' documentation report. Depth check locations shall be shown on a plan view drawing of the project area and included in the documentation report. 6.1.6 Permanent and Temporary Leachate Collection Sumps ' A permanent leachate collection sump will be installed at the low point in each of the four disposal phases (Phase 1, 2, 3a and 3b) as shown on the approved Site Development Plan ' dated January 12, 1996. A temporary leachate collection sump will be installed at the low point of each module as shown on appropriate plans. The CQA Consultant shall verify in the documentation report that the work was performed in accordance with the submitted plans ' and specifications. This will include verification that the 60 mil HDPE liner in the permanent sump has been installed per the specifications and anchored per the drawings. A minimum of one field moisture/density test will be performed on the compacted clay soil ' located in the HDPE anchor trench surrounding the permanent sump. The Certifying CQA Engineer will ensure that appropriate documentation will be provided in the CQA report confirming the condition of the cohesive liner surface, the resin used for the HDPE and the ' quality of the HDPE liner as it is placed, including whether installation specifications were met. An as-built drawing of the permanent sump will be submitted in the CQA report and will include HDPE panel layout and seam, destructive test, and repair locations. ' 7.0 FINAL CONSTRUCTION DOCUMENTATION REPORT After completion of each liner project a construction documentation/certification report will ' be prepared and submitted to the CDPHE and the WCDPHE. The report will consist of a detailed narrative describing construction of the area in chronological fashion. It will describe all major aspects of construction including: excavation subbase preparation, liner placement, leachate collection gravel drain line construction, protective cover placement, module separation berm placement and granular blanket placement. An analysis and discussion of all soil testing work performed will be included as well as proctor curve(s) for ' the soils being compacted. A cover letter shall be included under the seal of a registered professional engineer, rendering and opinion as to whether the facility has been constructed in substantial conformance to the approved plans and specifications. A registered land ' surveyor in the State of Colorado shall certify all survey data/documentation included in the report. A complete set of record drawings will also be submitted along with the report. A copy of a typical Table of Contents for the construction documentation/certification report is included as Appendix A to this CQAP. The Contractor shall complete the liner tie-in, as appropriate, described in the Technical Specifications. No tie-in work shall occur until the liner and LCS in the newly constructed ' module are completed in their entirety as determined by the Owner and CQA Consultant. The CQA Consultant shall document this work in the construction documentation/certification report. Revision 6—May 2011 11 I I TABLE 1 I North Weld Landfill Construction Quality Assurance Cohesive Soil Liner& Module Separation Berm Testing and Frequency I :. I Field Density* D2922 1 per 185 cy (each 100 foot centers per lift) Field Moisture* D3017 1 per 185 cy ' (each 100 foot centers per lift) D422/I140 Grain Size (excluding 1 per 3,000 cy 1 per 20,000 cy I Hydrometer) Atterberg Limits D4318 1 per 3,000 cy 1 per 20,000 cy Permeability** D5084 1 per 3,000 cy 1 per 20,000 cy IStandard Proctor D698 1 per 3,000 cy or as material 1 per 20,000 cy type changes in the field I One Point Proctor 1 per day during liner placement Moisture Content D2216 1 per 1,000 cy 1 per 20,000 cy I Note— The degree of saturation for each moisture/density test shall be greater than or equal to 80%. Historical site data and or hydrometer testing,ASTM D854 will be used for specific gravity determination. * - A minimum of one field moisture/density test will be performed on the compacted clay soil located in the HDPE anchor trench surrounding the permanent sump. I ** - Permeability testing is not required for cohesive soil liner material placed in separation berms, which will be removed during future construction. ' Granular Drainage Blanket Testing and Frequency t} a ax x s ` `st x'9 . t x{ 2xa"k�3E`v' 3 ID422/D1140 As necessary if Grain Size (excluding material type 1 per source I hydrometer) changes in the field Permeability D2434 1 per 3,000 cy 1 per source ' Leachate Collection Gravel Drain Line Testing and Frequency 4 { I 1 per 1,000 If or Minimum of ' Grain Size C136 2 Samples 1 per source Permeability D2434 1 per 1,000 If or Minimum of 1 per source 2 Samples 11 Revision 6—May 2011 12 I I I I I I I I APPENDIX A I TYPICAL TABLE OF CONTENTS I for ' CONSTRUCTION OBSERVATION REPORT I I I I I I I Revision 6—May 2011 I NORTH WELD LANDFILL PHASE 3A-MODULE 2 ' CONSTRUCTION OBSERVATION REPORT COHESIVE SOIL LINER AND LEACHATE COLLECTION SYSTEM ' TABLE OF CONTENTS (Typical) Section ' 1.0 INTRODUCTION 1.1 Purpose 1.2 Scope 1.3 Facility/Project History ' 2.0 SUMMARY OF CONSTRUCTION ACTIVITIES 3.0 CONSTRUCTION DOCUMENTATION REQUIREMENTS ' 4.0 CONSTRUCTION DOCUMENTATION 4.1 Excavation ' 4.1.1 Construction Requirements 4.1.2 Construction Activities 4.2 Subbase ' 4.2.1 Construction Requirements 4.2.2 Construction Activities 4.3 Two Foot Cohesive soil liner 4.3.1 Construction Requirements ' 4.3.2 Construction Activities 4.4 Cohesive soil liner Laboratory Soils Testing 4.4.1 Testing Requirements ' 4.4.2 Testing Procedures, Intervals, and Results 4.5 Granular(Sand) Blanket 4.5.1 Placement Requirements 4.5.2 Placement Activities 4.5.3 Soils Testing 4.6 Leachate Collection System ' 4.6.1 Installation Requirements 4.6.2 Installation Activities 4.7 Module Separation Berm ' 4.7.1 Construction Requirements 4.7.2 Construction Activities 5.0 CONCLUSIONS Revision 6—May 2011 I I ILIST OF TABLES Table I1 Subbase and Cohesive soil liner Record Survey Table 2 Clay Soil Analysis Summary I3 Leachate Trench and Piping Grades ' 4 Sand Drainage Blanket and Collection Stone Laboratory Analysis Summary 5 Sand Drainage Blanket Depth Survey Data I I I I I I I I I I I II Revision 6—May 2011 I ILIST OF APPENDICES IAppendix A CQA Staff and Construction Schedule ' B Preconstruction Meeting Notes C Density Test, Clay Soil and Granular Blanket/Pipe Bedding Sample Location Plan ISheets D Moisture- Density Relationship Data C-1 Liner Support Soil (if needed) C-2 Clay Soil I E Density Test Data D-1 Liner Support Soil (if needed) D-2 Clay Soil F Cohesive soil liner Soil Laboratory Test Data G Granular Blanket/Collection Stone Laboratory Test Data I F-1 Sand Blanket F-2 Collection Stone I H Quality Control Certificates H-1 Geotextile Quality Control Certificates H-2 Geomembrane Quality Control Certificates IH-3 Surveyor's Certificate I Sump Geomembrane(for permanent leachate collection sump) ' I-1 Geomembrane Field Monitoring Summary -2 Certificate of Acceptance of Soil Surface I-3 Geomembrane Deployment Log I I-4 Geomembrane Trial Seam Log I-5 Geomembrane Seam Log 1-6 Geomembrane Seam Test Log ' J Specification/Design Modification Forms K Record Drawings I I I I ' Revision 6—May 2011 FILE CONTAINS OVERSIZED MAP PLEASE SEE ORIGINAL FILE • • WASTE MANAGEMENT WASTE MANAGEMENT 8310 South Valley Highway Suite 200 April 7, 2006 Englewood,CO 80112-5806 O03)914-1400 Mr. Charles Johnson (303)914-9937 Fax Colorado Department of Public Health and Environment Hazardous Materials and Waste Management Division 4300 Cherry Creek Drive South Denver, CO 80246-1530 Subject: North Weld Landfill (NWLF) Revised Closure/Post-Closure Plan and Financial Assurance Plan Dear Mr. Johnson: Revised closure/post-closure and financial assurance plans for NWLF are enclosed. These plans were revised to include a change in the maximum area requiring final cover and in response to letters prepared by Mr. Ikenberry dated January 11 and February 13, 2006 and a February 8, 2006 meeting between representatives of Colorado Department of Public Health and Environment (CDPHE) and Waste Management. These plans dated March 2006, replace the previous plans that were prepared for the facility. As provided in Appendices A and B of the enclosed financial assurance plan, the 2006 closure and post-closure estimate is $1,378,308 (2002 dollars). Section 1.8.3 (C) of the Colorado Regulations Pertaining to Solid Waste Disposal Sites and Facilities, 6CCR-1007-2, requires an annual adjustment to the closure and post-closure financial assurance cost estimate by using the implicit price deflator (IPD) for the gross domestic product. The IPD for 2006 is 1.028 as confirmed with the Colorado Department of Public Health and Environment. Because the costs in Appendices A and B are based on 2002 dollars, the inflation adjustment must include, in addition to the 2006 adjustment factor, the adjustment factors for 2003, 2004 and 2005, which are 1.011, 1.016, 1.021 respectively. Accordingly, the cost estimate for 2006 is calculated as follows: $1,378,308 x 1.011 x 1.016 x 1.021 x 1.028 = $1,485,970 The enclosed insurance certificate reflects this adjustment to the NWLF financial assurance cost estimate. The updated plans and certificate have been placed in the facility operating record. /9/ (77/ C.\Documents and Settings\tschweit\My Documents\mydata\FinAssurance06\NW Transmtl Ltr 06.doc Letter Charles Johnson April 7, 2006 Page 2 Please call Alan Scheere at (720) 977-2107 or me at (303) 914-1445 if you have questions concerning the adjustment to the NWLF financial assurance. Sincerely, Tom Schweitzer, P.E. Environmental Engineer Enclosure cc: Douglas Ikenberry, CDPHE Troy Swain, WCDPHE Kim Ogle, WCDPS (w/o end) Bill Hedberg/NWSL Operating Record (2 copies) Alan Scheere, Waste Management Robert Sheehan, Waste Management (w/o end) A LIS2- 5" �. 2400 West Union Avenue Englewood,CO 80110 303-914-1445(Phone) WASTE MANAGEMENT 866-442-0285(Fax) RECEIVED OCT 14 2011 N?Li . :Manning Department OFFICE October 11, 2011 Mr. Jerry Henderson Colorado Department of Public Health and Environment Hazardous Materials and Waste Management Division HMWMD-SWIM-B2 4300 Cherry Creek Drive South Denver, CO 80246-1530 Mr. Troy Swain Weld County Department of Public Health and Environment 1555 N. 17th Avenue Greeley, CO 80631 SUBJECT: NORTH WELD LANDFILL THIRD QUARTER 2011 GAS MONITORING REPORT Dear Mr. Henderson and Mr. Swain: Enclosed for your information is the Third Quarter 2011 Gas Monitoring Report for North Weld Landfill (NWLF). The report dated September 16, 2011 was prepared by AquAeTer and documents their field monitoring activities conducted on September 13, 2011. The gas monitoring report contains monitoring results from the Phase 1 and 2 perimeter soil gas probes GP-06, GP-07, GP-10 through GP-20, structure probes GP-01 and GP-02, inside the shop and office, and confined spaces in the vicinity of the western boundary of the site. A map showing the gas probe locations, the scale house and maintenance shop is included as Figure 1. Section 2.3.1 of the Regulations Pertaining to Solid Waste Sites and Facilities, 6 CCR 1007-2, Part 1 (Regulations) requires that the concentration of explosive gases shall not exceed (A) 25% of the lower explosive limit (LEL) (1% by volume in air for methane) within facility structures, and (B) the LEL (5% by volume in air for methane- i.e., percent methane) at the facility boundary. During this monitoring event, methane was detected in perimeter probe GP-10 at a concentration of 21.6% and in structure probe GP-01 at a concentration of 19.7%. Combustible gas above regulatory limits was not detected in any of the other probes, shop, office or confined spaces. Combustible gas below regulatory limits was detected in probe GP-6 at a concentration of 2%. The facility currently operates under an approved gas remediation plan prepared in response to elevated gas concentrations in structure probe GP-01 and perimeter probes GP-10 and GP-11. The plan includes monthly monitoring of these probes and utility corridor access points along WCR 25. Included in Attachment 1 are the July and August 2011 monthly reports. A summary of the ntest results for these monthly events is provided in the following table. am c -Y n Io/ay�aol O2O/l Osl s mint puy-n-7 Letter Jerry Henderson and Troy Swain October 11, 2011 Page 2 CH4 Concentration Monitoring Probe July 2011 August 2011 GP-01 21.6 18.9 GP-10 8.7 5.5 GP-11 0.0 0.2 Methane was not observed in the utility corridor access points or facility structures during the monthly monitoring. The approved remediation plan also included the installation of passive gas vents in waste along the western limit of the disposal area. As stated in the plan, the passive vents, which were installed in December 2009, may require one or more years to show consistent reduction in methane concentrations at perimeter probes GP-10 and GP-11 and structure probe GP-01. Until methane concentrations are below the regulatory threshold for three consecutive monthly events, monthly monitoring will continue to be performed. Continuous methane monitors are in operation within the facility maintenance building, office and gatehouse and no methane detections have been observed. If you have any questions regarding this report, please contact me at (303) 914-1445. Sincerely, On behalf of North Weld Landfill Tom Schweitzer Engineering Manager cc: Kim Ogle, WCDPS, w/o enc. Bill Hedberg, NWLF 2400 West Union Avenue EngleTINN% C E I V E D 30341 -14 5( 80110 C 303-914-1445(Phone) WASTE MANAGEMENT 303-914-9937(Fax) 20 2011 October 13, 2011 .nning Department .:Y OFFICE Ms. Dana Podell Colorado Department of Public Health and Environment Air Pollution Control Division APCD-SS-B1 4300 Cherry Creek Drive South Denver, CO 80246-1530 Sent Certified Mail 7006 2150 0004 4548 9928 SUBJECT: NORTH WELD SANITARY LANDFILL (NWSL) TITLE V OPERATING PERMIT#97OPWE181 2011 SEMI-ANNUAL MONITORING REPORTS Dear Ms. Podell: In accordance with the NWSL Title V Operating Permit # 97OPWE181, attached are the following reports covering the monitoring period of April 1, 2011 —September 30, 2011. • Monitoring and Permit Deviation Report, Part I • Monitoring and Permit Deviation Report, Part III Part II of the Monitoring and Permit Deviation Report was not completed because there were no permit deviations, upsets or emergency conditions that occurred during this reporting period. Should you have any questions regarding these reports, please contact Tom Schweitzer at (303) 914-1445 or Bill Hedberg at(970) 686-2800 ext. 23. Sincerely, Tom Schweitzer Engineering Manager /attachments cc: Jim King, CDPHE APCD, w/enc. Douglas Ikenberry, CDPHE, w/enc. Troy Swain, WCDPHE, w/enc. Kim Ogle, WCDPS, w/enc. Bill Hedberg, NWSL Bruce Clabaugh, WMC Ararrumi/(,(.1/11-CTIR: o20//- 05//57 IO-024,-o2c/� PL Or) r '1( J Air Pollution Control Division Colorado Operating Permit Monitoring and Permit Deviation Report — Part I 1. Following is the required format for the Monitoring and Permit Deviation report to be submitted to the Division on a semi-annual basis unless otherwise noted in the permit. The Table below must be completed for all equipment or processes for which specific Operating Permit terms exist. 2. Part II of the Appendix B shows the format and information the Division will require for describing periods of monitoring and permit deviations, or upset or emergency conditions as indicated in the Table below. One Part II Form must be completed for each Deviation. Previously submitted reports (e.g. EERs or Upsets)may be referenced and the form need not be filled out in its entirety. FACILITY NAME: Waste Management Disposal Services of Colorado, Inc. -North Weld Sanitary Landfill OPERATING PERMIT NO: 97OPWEP181 REPORTING PERIOD: 4/01/11 -9/30/11 (see first page of the permit for specific reporting period and dates) Upset/Emergency Operating Permit Unit Unit Description Deviations noted Deviation Coder Condition Reported ID During Period?' During Period? YES NO YES NO E001 Landfill Gas Generation X X E002 Fugitive Particulate X X Emissions General Conditions X X Insignificant Activities X X See previous discussion regarding what is considered to be a deviation. Determination of whether or not a deviation has occurred shall be based on a reasonable inquiry using readily available information. 2 Use the following entries,as appropriate 1= Standard: When the requirement is an emission limit or standard 2= Process: When the requirement is a production/process limit 3= Monitor: When the requirement is monitoring 4= Test: When the requirement is testing 5= Maintenance: When required maintenance is not performed 6= Record: When the requirement is recordkeeping 7= Report: When the requirement is reporting 8= CAM: A situation in which an excursion or exceedance as defined in 40CFR Part 64 (the Compliance Assurance Monitoring(CAM)Rule)has occurred. 9= Other: When the deviation is not covered by any of the above categories C:\Air\N WLF\NWLF MPDR 2H201 I.doc Air Pollution Control Division Colorado Operating Permit Monitoring and Permit Deviation Report — Part II FACILITY NAME: Waste Management Disposal Services of Colorado, Inc. -North Weld Sanitary Landfill OPERATING PERMIT NO: 97OPWEP181 REPORTING PERIOD: 04/01/11 -09/30/11 (see first page of the permit for specific reporting period and dates) Is the deviation being claimed as an: Emergency Upset N/A (For NSPS/MACT)Did the deviation occur during: Startup Shutdown Malfunction Normal Operation OPERATING PERMIT UNIT IDENTIFICATION: Operating Permit Condition Number Citation Explanation of Period of Deviation Duration(start/stop date&time) Action Taken to Correct the Problem Measures Taken to Prevent a Reoccurrence of the Problem Dates of Upsets/Emergencies Reported(if applicable) Deviation Code Division Code QA: C:AAirANWLF\NWLF MPDR 211201] doc Air Pollution Control Division Colorado Operating Permit Monitoring and Permit Deviation Report — Part III SOURCE NAME: Waste Management Disposal Services of Colorado, Inc. -North Weld Sanitary Landfill FACILITY IDENTIFICATION NUMBER: 1230209 PERMIT NUMBER: 97OPWEP181 REPORTING PERIOD: 4/01/11 -09/30/11 (see first page of permit for specific reporting period and dates) All information for the Title V Semi-Annual Deviation Reports must be certified by a responsible official. The responsible official signing this certification must be pre-approved by the Division in accordance with Colorado Regulation No. 3, Part A, Section I.B.38. This signed certification document must be packaged with the documents being submitted. STATEMENT OF COMPLETENESS I have reviewed the information being submitted in its entirety and, based on information and belief formed after reasonable inquiry; I certify that the statements and information contained in this submittal are true, accurate and complete. Please note that the Colorado Statues state that any person who knowingly, as defined in Sub- Section 18-1-501(6), C.R.S., makes false material statement, representation, or certification in this document is guilty of a misdemeanor and may be punished in accordance with the provisions of Sub-Section 25-7 122.1, C.R.S. Brad Pollock Director of Landfill Operations Printed or Typed Name Title 10/14/2011 Signature of Responsible Official Date Signed Note: Deviation reports shall be submitted to the Division at the address given in Appendix D of this permit. No copies need be sent to the U.S. EPA. C\Air\NWLF\NWLF MPDR 2n201 I doc je�her optimizing 7430 E. Coley Avenue, Ste 310 . Centennial, CO 80111 . Phone (303) 771-9150 - Fax (303) 771-8776 August 30, 2011 113320 RECEIVED Mr. Jerry Henderson Colorado Department of Public Health and Environment SEP Q F 7 011 Hazardous Materials and Waste Management Division ?I HMWMD-SWIM-B2 lan elr; m.g Department -. an OFFICE 4300 Cherry Creek Drive South GREELEY Denver, Colorado 80246-1530 Mr. Troy Swain Weld County Department of Public Health and Environment 1555 N. 17th Avenue Greeley, Colorado 80631 RE: North Weld Landfill, Ault, Colorado First Half 2011 Groundwater Monitoring Report Dear Mr. Henderson and Mr. Swain: On behalf of Waste Management Disposal Services of Colorado, Inc., AquAeTer, Inc. submits the first half 2011 groundwater detection monitoring results for the North Weld Landfill (NWLF) in Ault, Colorado. Regular semi-annual detection groundwater monitoring was completed in March 2011. Enclosed is one copy of the report for CDPHE, one copy of the report for WCDPHE, and an electronic file containing laboratory analytical data for CDPHE. There were no volatile organic compound detections and no statistical exceedances during the first half 2011 event, and NWLF remains in detection monitoring in accordance with 6 CCR 1007-2, Part 1 — Regulations Pertaining to Solid Waste Sites and Facilities (revised March 30, 2011). In anticipation of including shallow well MW-9 in the groundwater monitoring system prior to landfilling in the vicinity as early as 2015, one event of background monitoring at this well was conducted in the 1H11. The monitoring results for well MW- 9 are included in this report. •Qc,wrn x. es ' ov, 01I - 05- 15 Mr. Jerry Henderson and Mr. Troy Swain 113320 August 30,2011 Page 2 If you have any questions pertaining to the groundwater detection monitoring program at NWLF, please contact Mr. Bill Hedberg at (970) 686-2800 or Mr. Tom Schweitzer at (303) 914-1445. Sincerely, AquAeTer, Inc. era C'� ,- S� Terra Plute, E.I. Cathryn Stewart, P.G. Project Engineer Project Manager cc: Mr. Kim Ogle, WCDPS, w/o enc. Mr. Louis Bull, Waste Management, w/enc. Mr. Bill Hedberg, Waste Management, w/enc. Mr. Brad Pollock, Waste Management, w/o enc. Mr. Tom Schweitzer, Waste Management, w/enc. • 2400 West Union Avenue Englewood,CO 80110 303-914-1445(Phone) 303-914-9937(Fax) WASTE MANAGEMENTM ' 2011 PCL g Department November 8,2011 G; __ JFFICE Sent by Email Hard Copy to be Mailed Mr.Doug Ikenberry Colorado Department of Public Health and Environment Hazardous Materials and Waste Management Division HMWMD-SWIM-B2 4300 Cherry Creek Drive South Denver, CO 80246-1530 Mr.Troy Swain Weld County Department of Public Health and Environment 1555 N. 17th Avenue Greeley,CO 80631 SUBJECT: NORTH WELD LANDFILL(NWLF) UPDATE TO REMEDIATION PLAN FOR ELEVATED METHANE CONCEN[RATIONS Dear Mr.Ikenberry and Mr. Swain: On September 15, 2011, Waste Management Disposal Services of Colorado, Inc. (WMDSC) submitted a document titled, "Remediation Plan for Landfill Gas Occurrence" (Plan), in response to elevated methane levels at NWLF in perimeter gas probes GP-10 and GP-11 and structure probe GP-1, which is located adjacent to the facility maintenance building. The Plan,which was approved by CDPHE in consultation with Weld County Department of Public Health and Environment (WCDPHE) on November 20, 2009, included the installation of six vertical passive gas vents in the waste along the western limit of the disposal area. The fieldwork was completed between December 17 and 19, 2009 and the work was summarized in a report submitted to CDPHE and WCDPHE on January 20,2010. The work was performed in conformance with the Plan except that seven passive gas vents, instead of six,were installed. With the installation of the passive vents,the methane levels in GP-11 are now consistently below regulatory compliance levels and typically below detection levels. Probes GP-1 and GP-10, while at times have registered no or very low methane concentrations since the vents were installed, commonly show elevated methane levels during monitoring. We are planning to install four additional vertical passive vents in the southwest corner of the disposal area, which is the area closest to Probes GP-1 and GP-10. We believe the addition of these vents will further establish an inward gradient for landfill gas, which should result in attenuating gas concentrations in the gas probes. The attached Figure 1 depicts the approximate locations of the additional probes. We plan to install two vents between existing vents PV-1 and PV-2, which are about 300 feet apart, and two vents between existing vents PV-2 and PV-3, which are about 250 feet apart. With the additional vents, the approximate spacing between vents will range between 85 and 100 feet. The actual vent locations may vary based on field conditions during installation. £3 Thn- t lstitA2.o 11-mil- L11 rJlJ— OSiS PLOTT7 Mr. Doug Ikenberry and My. Troy Swain November 8, 2011 Page 2 The vents will be constructed consistent with the details provided in the 2009 Plan. Given the availability of a drilling rig and crew that are mobilizing to the area, WMDSC plans to install the passive vents this month or next. Should you wish to observe any of the gas vent installation, please let me know and I will keep you updated on the driller's schedule. Per the 2009 Plan, monthly monitoring of GP-1 and GP-10 will continue and the effect of the vents will be evaluated. WMDSC understands that after a sufficient evaluation time, it may be determined that additional means are necessary to control the landfill gas and will approach CDPHE and WCDPHE with its findings. If you have any questions regarding this project,please contact me at(303)914-1445. 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