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Home My WebLink About931758.tiff Waste Services Corporation 6037 77th Avenue Greeley, Colorado 80634 A Waste Management Company 303/330-2641 11Ci November 10, 1993 Mr. Steve Laudeman Colorado Department of Health HMWMD-SWIM-B2 4300 Cherry Creek Drive South Denver, Colorado 80222-1530 Mr. Jeff Stoll Weld County Department of Health 151716th Avenue Court Greeley, Colorado 80631 /Mr. Chuck Cunliffe Weld County Department of Planning Services 1400 North 17th Avenue Greeley, Colorado 80631 SUBJECT: NORTH WELD SANITARY LANDFILL, PHASE 1, MODULE 2, FINAL LINER TIE-IN REPORT Dear Messrs. Laudeman, Stoll, and Cunliffe: Enclosed please find the "Final Letter Report Documenting the Removal of the Clay- Block and Restoration of the Leachate Collection System for Module 2 , Phase 1, North Weld Sanitary Landfill, Weld County, Colorado" prepared by Golder Construction Services, Inc. ,. dated November 4, 1993. A copy of this report has . also been placed into the Operating Record at the Facility. We expect to commence filling within this module around the week of November 15, 1993 . If you have any questions, please contact Alan Scheere or Bill Hedberg at 686-2800. Sincerely, �, f'U�'`On`A_9` Bill Hedberg Alan Scheere Division V.P.-Landfill Operations Environmental Specialist Enclosure BH.AS/hjw cc: Mark Sebesta, GCS, w/o enclosure Todd Thomas, TARCO, w/o enclosure Gary Cantrell, RUST, w/o enclosure �� "r l/7� �' Chip Wertz, WMDSC, .w/ enclosure `-,r"t Tom Buchholz, WMDSC, w/o enclosure D NOV 18 1993 1 Weld County Planning q 3/75gr Pt o7-7-7 0 . 0 i t. . _L .'.li �� ri�ltAl i:iii'.t..3'! .. 1 t • AGQCS Golder Construction Services, Inc. Quality Assurance and Construction Management November 4, 1993 Our Ref: 937-4201 • Mr. Bill Hedberg Waste Management Disposal Services of Colorado, Inc. 40000 Weld Road 25 Ault, Colorado 80610 RE: FINAL LETTER REPORT DOCUMENTING THE REMOVAL OF la CLAY BLOCK AND RESTORATION OF THE LEACHATE COLLECTION SYSTEM FOR MODULE 2, PHASE 1, NORTH WELD SANITARY LANDFILL, WELD COUNTY, COLORADO Dear Bill: Golder Construction Services, Inc. (GCS) is pleased to submit this letter report summary of the construction quality assurance (CQA) services performed at the North Weld Sanitary Landfill (NWSL) during the period of October 1, 1993 through October 4, 1993. This summary documents the removal of the clay block and restoration of the liner system between Modules 1 and 2 of Phase 1. GCS's on-site CQA services for Module 2 have included construction observation, testing of materials used for construction, preparation of the construction documentation report, and liner observations discussed herein. The construction documentation report entitled, "Final Report, Quality Assurance Monitoring During Construction of Phase 1, Module 2, North Weld Sanitary Landfill, Weld County, Colorado" was reviewed by the Colorado Department of Health(CDH) and the Weld County Department of Health(WCDH)during the period of August 19, 1993 through September 22, 1993. CDH and WCDH were in concurrence that Module 2 construction and testing were completed in a satisfactory manner (see Attachment 1). Based upon the fmdings of the CDH and WCDH, removal of the clay block and restoration of the liner system, as discussed below, began on October 1, 1993. Construction Synopsis • The weather during the removal of the clay block and restoration of the liner system was clear and dry. Low temperatures ranged from 45 to 50 degrees with high temperatures ranging from 70 to 80 degrees. Personnel from Tarco, Inc. (Tarco) used equipment from Tarco and Waste Management Disposal Services of Colorado, Inc. (a.k.a. Waste Services Corporation - WSC) to perform the earthwork activities associated with the removal of the clay block and restoration of the liner system in Module 2. Surveying associated with the construction activities was J BOLDER CONSTRUCTIONS SERVICES.INC. •200 UNION BOULEVARD,SUITE 500 • LAKEWOOD,COLORADO 80228•TELEPHONE: (303)980-0540•FAX:(303)985-2080 Q O November 4, 1993 -2- 937-4201 performed by Montgomery-Phillips, Inc. Figure G-1 presents a plan view of the construction area. Equipment used for construction generally consisted of one Caterpillar(Cat) 623 scraper, one Cat D7 bulldozer, one Cat D4 bulldozer, one Galion motor grader, a John Deere 310 backhoe, and one Cat 225 trackhoe. Removal of the clay block commenced on October 1, 1993 and was completed on October 2, 1993. A Cat 623 scraper and Galion motor grader were used to remove the clay block. The block was removed from the toe of the north slope to the berm near the toe of the south slope. Final grading of the clay liner was completed with the motor grader. The temporary sump in Module 1 was removed and replaced with compacted clay liner material on October 2, 1993. A Cat 225 trackhoe was used to excavate the gravel from the temporary sump of Module 1. The excavated material was managed at the NWSL according to the special waste plan in effect at the facility. The east edge of the sump was over- excavated to verify that the minimum 3-foot thickness of clay would be present below the leachate trench. Clay liner material was then placed and compacted in the sump. The material was placed in maximum 6-inch loose lifts and compacted with a tamping foot compactor attached to the Cat 225 trackhoe. The leachate collection trench located in the center of Module 2 was tied into the existing trench in the center of Module 1 on October 2, 1993 after the gravel in the temporary sump was removed and replaced with clay liner. A John Deere 310 backhoe was used to excavate the trench. The GCS monitor examined the trench for depth before Trevira 1120 geotextile fabric (roll number 211071761) was installed. One-inch nominal gravel bedding material was placed over the geotextile fabric to a 3-inch nominal depth. Leachate collection pipe, consisting of 6-inch perforated schedule 80 PVC pipe, was placed on the bedding material with perforations placed on the downside. The leachate pipe sections were connected with slip couplings anchored by two stainless steel self-tapping screws on each side of the connection. The gravel was backfilled around the pipe to the level of the top of clay. The geotextile fabric was then overlapped a minimum of 12-inches above the gravel. Drainage layer placement occurred on October 4, 1993. The drainage layer material consisted of sand obtained from a small stockpile in Module 2 and material from Western Mobile's 35th Avenue pit in Greeley. A Cat D4 bulldozer spread the material into a minimum 1-foot high lift and the layer was fine graded on October 5, 1993. The surveyors verified that the sand drainage layer thickness was within the project specifications. The module separation berm at the south end of the tie-in was completed on October 4, 1993. Geotextile fabric was placed above the sand drainage layer and clay liner material was then placed and compacted with a Cat 623 scraper. The motor grader was used to shape the berm to the specified dimensions. a Golder Construction Services, Inc. November 4, 1993 -3- 937-4201 Test Results Four in-place moisture/density tests were performed on the clay liner compacted in the temporary sump of Module 1. The results from all four tests exceeded the minimum project specification and Development Standard of 95 percent of the standard Proctor maximum dry density at a moisture content between -4 to +4 percent of optimum moisture content. The degree of saturation values exceeded the minimum project specification of 80 percent. The results of the density tests are presented in Table G-1. Record Surveys Montgomery-Phillips' surveyors completed record surveys (certification) for the top of clay liner and top of drainage layer in.the tie-in area between Module 1 and Module 2. The survey information is presented in Attachment 2. Personnel On-site GCS soil monitor Kerry Bayer was on-site October 1 through October 4, 1993. Summary In our opinion, the clay block removal and liner system restoration observed by GCS in Module 2 meets the project specifications. This letter report is to be inserted in Appendix G of the construction documentation report. If you have any questions or comments pertaining to this letter report summary, please contact us. Sincerely, GOLDER CONSTRUCTION SERVICES, INC. ”0ufgWUinpgiiiipEco Mark E. Sebesta, P.E. ea.'�E. SFeF�f�r� - Mwo� Senior Engineer 0 26414 9 a Et e. David L. O'Sadnick, P.E. � sIONA`` �� o Associate MES/DLO/sjm Attachment 1: Colorado Department of Health Letter Weld County Department of Health'Letter Attachment 2: Montgomery-Phillips - Survey Information Golder Construction Services, Inc. r O N R I,- Cr) 0) .:.o:i w:O•,- 1' Co N N u.ytc�t r N N r ...5rq".,.^ O m m O 4}is afZZ t F+.:i `2:' O •O •O •O 33k.:z:! . ;..: , 1 1 1 r w r w W r ai oiocd a:: ,{y::...., OO o0 :I . or IL ....R. . N00N aw ZZ ai of of of a It H0 0 0 0 dawn 0 0 Co 0 Z r W - r co r m m W Z 6 w of of v cJ c co m < Gi : ' 0000 a < Z : 9-- I- W MiiMaii W z : , O o;- omar U - $' aimaa w cc 2 Z O O O U E O .. ;: r H o w e } ::::::` ' to N F .T. b Ct Q •V j N o m a a W p aa. aa. cd 'co ' `0 r=nc=naiai ~ � m o .: q .- r r r c t cd 0 : .LY 0000 c -aU :::2 0000 U � O c n a T d c f- �2'i o m m m m 1- II IEENUff mOrnm n 76 c.) N N N N 1-- w O `'>'.9i. O O a O .- r r r .- N 0 CO ii.::iiiigiiSitO CO a) r N m Y Y m h h' F' a W a ::: ' F' l-O 15 a' .y Z O I 8 8 Golder Construction Services, Inc. e 1 S O z r 1 O O g T o to Z Q ~ g R 0 p m w y 2 0 0 o o .4_1/4' ` o o b To N O O F- CV CC LU 6 O o N W -oo O O 0 0 Z LL J Y Zi Z p 'E o. al co0 a) C O O Z V \ W 2 J F 1- J� Or Z� O W I O w z /SI I I Q Q ¢ Q J co p VW I Co gm } o J I I 0V X a CC NE) I C-- ccJw v I CL I � w d u. J So, I < 00 0 Z Z _ F a o 1 I I I I I I I I I I I 0 0 0 0 0 0 0 9 9 0 0 o c an n 1N. CO N N n N ^ o^ 0 0 z_ m V i O itu Ilr N. ice/ N. CS p N. . N Y - btlie - / I w �O N. c c; JN N. Z a m 6 i' _ • �N yY O1 8 �, 2 GI f •- CC _ _ -JD \ o f W 0 .) 1 iII ___r______ ; - \� a.l F- i J v 0 , \� `- C 1i CV J a2W 1 0 um 03 / u__ Z LL. p 1 Q022 ( / ILI _ O Z "' __ � 2mZo� / Q a cc I 0 4 W CC ¢moo¢ 9 / o- ¢ I \ a0Z / CNa O \ 0. 4 / �~ CO L2 CC U 5. i� U- WON o > \ J w waa \ / o20 w O jam? \\ // m- 5 d / W 020 \ // CO = �W / w H / ¢- W CA O J i-- & 3 z m a 1 i 1 I I I - 1- I I 1 � _ i z Lo V p ATTACHMENT 1 November 4, 1993 937-4201 Golder Construction Services, Inc. STATE OF COLORADO COLORADO DEPARTAiEN)OF HEALTH Declared to protecting and Gnprovtn�Ue health and � • environmental tbepeopkof bCo j 0 4300 Chenrryy Creek Dr.s. IAhenr eyotAl.&6 Derwer,Coke 080222-1530 4210E nth Annus Phone D031692-2003 Denver,Dekxa&602204716 O0316914700• September 20, 1993 Ow ��e6o,'�' Patkit A.Nolan,MD,MPH Mr. Bill Hedbergagain Maar Waste Services Corporation 6037 77th Avenue Greeley, CO 80634 RE: CONSTRUCTION QUALITY ASSURANCE MONITORING REPORT PHASE 1, MODULE 2 NORTH WELD SANITARY LANDFILL(NWSL),WELD COUNTY,COLORADO Dear Mr. Hedberg: The Hazardous Materials and Waste Management Division of the Colorado Department of Health(the Division)has completed its review of the above referenced document. This report, titled 'Final Report Quality Assurance Monitoring During Construction of Phase 1, Module 2 North Weld Sanitary Landfill, Weld County,Colorado',was prepared by Golder Construction Services(GCS)on behalf of Waste Services Corporation(WSC)and dated August, 1993. The report and cover letter were received by the Division on August 19, 1993. The Division finds that, based on a review of the submitted information,all construction and related testing have been completed in a satisfactory manner. The only Division concern regarded the disposition of the gravel backfill to be removed from the Module 1 temporary sump. In a September 17, 1993 telephone conversation with Alan Scheere of WSC, it was agreed that this material would be subjected to WSCs standard special waste protocol, and, if it was determined to be an acceptable waste, would be disposed of in Module 1. All Division concerns regarding this matter have therefore been addressed, and the Division hereby gives approval to the construction and testing of the referenced landfill phase. If you have any questions regarding the content of this letter,please contact me at (303) 692-3462. S<etcrplY, • Stepf}en La deman Geological Engineer Solid Waste Section Hazardous Materials and Waste Management Division cc: Chuck Cunliffe, Weld County Planning Services Trevor Jiricek, Weld County Department of.Health Alan Scheere, Waste Services Corporation Pile: SW/WLD/N%yC/#1 •® $ECEIVEl? SFP 9 ltlea DEPARTMENT OF HEALTH 1517-16 AVENUE COURT GREELEY,COLORADO 80631 ADMINISTRATION (303)353.0586 gipe, HEALTH PROTECTION (303)353.0635 , COMMUNITY HEALTH(303)353-0639 COLORADO September 22, 1993 Bill Hedberg Waste Services Corporation - 6037 77th Avenue Greeley, Colorado 80631 Dear Mr. Hedberg: The Environmental Protection Division of the Weld County Health Department has completed the review of the final report, Quality Assurance Monitoring during construction phase 1, Module 2, North Weld Sanitary Landfill, in Weld County, Colorado. The Division finds the document to be acceptable as submitted and has no further comment at this time. If you have further questions, please contact me at 353-0635. Sincerely, <' Q Os / Trevor Jiricek - Solid and Hazardous Waste Specialist TJ/jg-1878 cc: Roger Doak, Colorado Department of Health Chuck Cunliffe, Weld County Planning Department Q ATTACHMENT 2 November 4, 1993 937-4201 Golder Construction Services, Inc. MGOMERY-PHILLIPS,OW. LAND SURVEYING 7550 W. Yale Ave., Suite 110 Denver, CO 80227 PH(303) 989-3383 • FAX(303) 989-8944 November 3 , 1993 Job No . 350 . 001 Golder Associates 200 Union Blvd . , Ste . 500 Lakewood, CO 80228 Attn : Mr . Mark Sabesta Re : North Weld Certifications Certification Checks — Too of Sand — Tie In Area Results of Field Survey - October 5 , 1993 TOC DL POINT NORTHING FASTING ELEV. THICK . TOD 600 457200 . 0 2186550 . 0 5115 . 8 1 . 1 5116.9 602 457225 . 0 2186575 . 0 5114. 1 1 . 0 5115.1 605 457250 . 0 2186600 . 0 5112 . 7 1 . 0 5113.7 609 457275 . 0 2186625 . 0 5112 . 0 1 . 2 5113.2 614 457300 . 0 2186650 . 0 5111 . 1 1 . 0 5112.1 620 457325 . 0 2186675 . 0 5109 . 7 1 . 0 5110.7 627 457350 . 0 2186700 . 0 5108 . 3 1 . 1 5109.4 642 457350 . 0 2186750 . 0 5106 . 2 _ . 2 5107.4 650 457375 . 0 2186775 . 0 5105 . 1 1 . 0 5106.1 659 457400 . 0 2185800 . 0 5103 . 7 1 . 1 5104.8 660 457450 . 0 2186800 . 0 5103 . 7 1 . 0 5104.7 661 457500 . 0 2186800 . 0 5104 . 0 1 . 2 5105.2 662 457550 . 0 2186800 . 0 5104 . 8 1 . 2 5106.0 663 457600 . 0 2186800 . 0 5105 . 5 1 . 1 5106.6 664 457650 . 0 2186800 . 0 5106 . 1 1 . 1 5107.2 665 457700 . 0 2185800 . 0 5107 . 1 1 . 1 5108.2 666 457750 . 0 2186800 . 0 5107 . 8 1 . 0 5108.8 667 457800 . 0 2186800 . 0 5109 . 5 1 . 0 5110.5 ,.,:r:nrnrrrn Yher2X•? Re; Land Surve r No. 2803 Colorado Springs Office- 6290 Lehman Dr., Suite 202, Colorado Springs, CO 80918 • PH(719)590-9227 • FAX(719)590-9229 D o • rt . DEPARTMENT OF HEALTH 1517.16 AVENUE COURT ' - GREELEY,COLORADO 80631 O ADMINISTRATION (303)353.0566 HEALTH PROTECTION(303)353-0635 COMMUNITY HEALTH(303)353-0639 COLORADO October 6, 1993 rOCTgT1-‘ 0 8 1993 - William J. Hedberg Weld County Planning Waste Services Corporation 40000 Weld County Road 25 Ault, Colorado 80610 Dear Mr. Hedberg: On September 16, 1993, a representative of the Environmental Protection Division of the Weld County Health Department inspected the North Weld Sanitary Landfill, located at 4OOOO Weld County Road 25, Ault, in Weld County, Colorado. The purpose of the inspection was to inspect and assess the facility's compliance with the "Regulations Pertaining to Solid Waste Disposal Sites and Facilities" as promulgated by the Solid Waste Disposal Sites and Facilities Act, Title 30, Article 2O, Part 1, C.R.S. , as amended, and the Development Standards as set forth in U.S.R.-895. . On this date, this facility was found to be in compliance with both the "Regulations Pertaining to Solid Waste Disposal Sites and Facilities" and the Development Standard set forth in U.S.R.-895. If you have any questions regarding this inspection, please contact this office at 353-O635. Sincerely, • iturt.01/0 - Trevor Jiricek, Supervisor Su P Environmental Protection Services TJ/cs-2O26 cc: Roger Doak, Colorado Department of Health Keith Schuett, Weld County Planning Department Lee Morrison, Weld County Assistant Attorney 0 DEPARTMENT OF HEALTH 1517-16 AVENUE COURT IGREELEY,COLORADO 80631 WI e ADMINISTRATION (303)353-0586 HEALTH PROTECTION(303)353-0635 COMMUNITY HEALTH (303)353-0639 COLORADO September 22, 1993 Bill Hedberg - Waste Services Corporation 6037 77th Avenue 1 Greeley, Colorado 80631 - Dear Mr. Hedberg: ` The Environmental Protection Division of the Weld County Health Department has completed the review, of the final report, Quality Assurance Monitoring during construction phase 1, Module 2, North Weld Sanitary Landfill, in Weld County, Colorado. The Division finds the document to be acceptable as submitted and has no further comment at this time. If you have further questions, please contact me at 353-0635. Sincerely, ` V fv Alla f' put Trevor Jiricek Solid and Hazardous, Waste Specialist TJ/jg-1878 cc: Roger Doak, Colorado Department of Health Chuck Cunliffe, Weld County Planning Department • 194311 Weld toantyPlanning, SEP 2 2 O STATE OPCOLORADO COLORADO DEPARTMENT OF HEALTH i:s•cozo Dedicated to protecting and improving the health and �. Y:,,• environment of the people of Colorado •c.' ,� 4300 Cherry Creek Dc S. Laboratory Building 0 ,� E z V E •• ..• ✓`' Denver,Colorado 80222-1530 4210 E.11th Avenue r876 Phone(303)692-2000 Denver,Colorado 80220-3716 (303)691-4700 SE A 1993 Roy Romer September 20, 1993 vGG1 C/� 97Governor Patricia A.Nolan,MD,MPH Weld County MiningExecutive Director Mr. Bill Hedberg Waste Services Corporation 6037 77th Avenue Greeley, CO 80634 RE: CONSTRUCTION QUALITY ASSURANCE MONITORING REPORT PHASE 1, MODULE 2 NORTH WELD SANITARY LANDFILL (NWSL), WELD COUNTY, COLORADO Dear Mr. Hedberg: The Hazardous Materials and Waste Management Division of the Colorado Department of Health (the Division) has completed its review of the above referenced document. This report, titled 'Final Report Quality Assurance Monitoring During Construction of Phase 1, Module 2 North Weld Sanitary Landfill, Weld County, Colorado', was prepared by Golder Construction Services(GCS) on behalf of Waste Services Corporation (WSC) and dated August, 1993. The report and cover letter were received by the Division on August 19, 1993. The Division finds that, based on a review of the submitted information, all construction and related testing have been completed in a satisfactory manner. The only Division concern regarded the disposition of the gravel backfill to be removed from the Module 1 temporary sump. In a September 17, 1993 telephone conversation with Alan Scheere of WSC, it was agreed that this material would be subjected to WSC's standard special waste protocol, and, if it was determined to be an acceptable waste, would be disposed of in Module 1. All Division concerns regarding this matter have therefore been addressed, and the Division - - hereby gives approval to the construction and testing of the referenced landfill phase. If you have any questions regarding the content of this letter, please contact me at (303) 692-3462. Sinc ly, Step en La deman Geological Engineer Solid Waste Section Hazardous Materials and Waste Management Division cc: gi-iuck:.Cunliffe5 Weld County Planning Services Trevor Jiricek, Weld County Department of Health Alan Scheere, Waste Services Corporation File: SW/WLD/NWC/#1 Waste Services Corporation © �. 6037 77th Avenue Greeley, Colorado 80634 A Waste Management Company 303/330-2641 - September 15, 1993 Mr. Steve Laudeman Revised letter Colorado Department of Health HMWMD - SWIM-B2 43OO Cherry Creek Drive South - Denver, Colorado 8O222-153O Mr. John Pickle, MSEH Weld County Health Department 1517 16th Street Greeley, Colorado 8O631 ✓ Mr. Chuck Cunliffe Weld County Department of Planning Services 915 1Oth Street Greeley, Colorado 8O631 SUBJECT: NORTH WELD SANITARY LANDFILL PHASE 1, MODULE 2 CELL CONSTRUCTION CQA DOCUMENTATION REPORT Gentlemen: Enclosed is a corrected version of the above-referenced letter dated August 18, 1993 for the North Weld Sanitary Landfill Phase 1, Module 2 Cell Construction CQA Documentation Report. This letter clarifies that we are requesting approval of the report. We apologize for any confusion. If you should have any questions, please call. Sincerely, /Q4 ! Bill Hedberg Division Vice President - Landfill Operations " erldCECoumPPy2 IVES 1 1943IFILE: nw 43543606, w/enc. & 3.2.93 �/ �81/Ujpg c:\WP51\PM93\43606RPT.L1 111 • • • • • • • • • • • • • • �'1 .trafryi.�Z1i. Waste Services Corporation 6037 77th Avenue Greeley, Colorado 80634 A Waste Management Company 303/330-2641 September 15, 1993 Mr. Steve Laudeman Revised letter Colorado Department of Health HMWMD - SWIM-B2 4300 Cherry Creek Drive South Denver, Colorado 80222-1530 Mr. John Pickle, MSEH Weld County Health Department 1517. 16th Street Greeley, Colorado 80631 Mr. Chuck Cunliffe Weld County Department of Planning Services 915 10th Street Greeley, Colorado 80631 SUBJECT: NORTH WELD SANITARY LANDFILL PHASE 11 MODULE 2 CELL CONSTRUCTION CQA DOCUMENTATION REPORT Gentlemen: Enclosed for your review and approval is a copy of the Golder Construction Services, Inc. (GCS) report dated August 1993 entitled, "Final Report, Quality Assurance Monitoring During Construction of Phase 1 Module 2, North Weld Sanitary Landfill, Weld County, Colorado" . This report documents the Module 2 construction activities, construction quality assurance (CQA) monitoring and test results, and record survey documentation which occurred from December 1992 through July 27, 1993 . The Module 2 leachate collection system and sand drainage layer is currently isolated from the leachate collection system and drainage layer in the active landfilling area (Module 1) by a three foot clay block. The clay block will be removed as a part of the final liner system tie-in activities which will occur after the review and approval of . this documentation report by the Colorado Department of Health and the. Weld County Health Department. We have scheduled to complete the final liner tie-in activities between Modules 1 and 2 and commence landfill activities in Module 2 during the week of September 20, 1993, subject to the completion of your review and approval of the enclosed report. Tie-in activities will include: FILE: nw 43543606, w/enc. & 3.2.93 0:\WP51\PM93\43606RPT.L1 o • ‘4!!!;' A Waste Management Company Mr. Steve Laudeman Mr. John Pickle Mr. Chuck Cunliffe September 15, 1993 .Page 2 o Removing the three foot clay block;, o Removal of the Module 1 temporary leachate collection sump; o Connection of the leachate collection system between Modules 1 and 2; o Completion of the sand- drainage layer within the tie-in area; and o Preparation of a CQA letter report documenting liner - - -`systems -tie-in -activities (for inch sion_withiri Appendix G of this report) . • In order for the tie-in activities and landfilling to proceed in accordance to this schedule your approval of the enclosed report is needed by September 17, 1992. If this does not allow sufficient time for you to review the report, please contact me as soon as • possible. If you have any questions during your review of this CQA documentation report, please feel. free to contact Chip Wertz - WSC • Project Manager (303) '699-0669, Mark Sebesta - GCS Project Manager (303) 980-0540 or me at (303) 330-2641. Sincerely, Bill Hedberg Division Vice President - Landfill Operations Enclosure CW/cw - cc: Roger Doak, CDH, w/o enclosure Trevor Jiricek, WCHD, w/o enclosure Mark Sebesta, GCS, w/o enclosure Todd Thomas, Tarco, w/o enclosure Gary Cantrell, RUST, w/ enclosure Chip Wertz, WMC, w/ enclosure Tom Buchholz, WMC, w/o enclosure Alan Scheere, WMC, w/ enclosure • • FILE: nw 43543606, w/enc. & 3.2.93 C:\WP51\PM93\43606RPT.L1 Waste Services Corporation Q 6037 77th Avenue Greeley, Colorado 80634 A Waste Management Company 303/330-2641 • W8E993fl September 10, 1993 WMeld PAP*Planning Mr. Steve Laudeman Revised letter • Colorado Department of Health HMWMD - SWIM-B2 4300 Cherry Creek Drive South Denver, Colorado 80222-1530 Mr. John Pickle, MSEH Weld County Health Department _ 1517 16th Street Greeley, Colorado 80631 • Mr. Chuck Cunliffe Weld County Department of Planning Services 915 10th Street - Greeley, Colorado 80631 SUBJECT: NORTH WELD SANITARY LANDFILL PHASE 1, MODULE 2 CELL CONSTRUCTION CQA DOCUMENTATION REPORT Gentlemen: • Enclosed is a corrected version of the above-referenced letter dated August 18, 1993 for the North Weld Sanitary Landfill Phase 1, Module 2 Cell Construction CQA Documentation Report. This letter clarifies that we are requesting approval of the report. We apologize for any confusion. If you should have any questions, please call. Sincerely, Bill Hedberg Division Vice President - - Landfill Operations a FILE: nw 43543606,w/enc. & 3.2.93 C:\WP51\PM93\43606RPT.L1 vti Waste Services Corporation 6037 77th Avenue Greeley, Colorado 80634 A Waste Management Company 303/330-2641 StA°ASeptember 10, 1993 ��@ v 1993 a�®t� .r ffill'12011,n9 Mr. Steve Laudeman Revised letter Colorado Department of Health HMWMD - SWIM-B2 4300 Cherry Creek Drive South Denver, Colorado 80222-1530 Mr. John Pickle, MSEH Weld County Health-Department 1517 16th Street Greeley, Colorado 80631 Mr. Chuck Cunliffe Weld County Department of Planning Services 915 10th Street Greeley, Colorado 80631 SUBJECT: NORTH WELD SANITARY LANDFILL PHASE 1, MODULE 2 CELL CONSTRUCTION - CQA DOCUMENTATION REPORT Gentlemen: Enclosed-for your review and approval is a copy of the Golder Construction Services, Inc. (GCS) report dated August 1993 entitled, "Final Report, Quality Assurance Monitoring During Construction of Phase 1 Module 2, North Weld Sanitary Landfill, Weld County, Colorado". This report documents the Module 2 construction activities, construction quality. assurance (CQA) monitoring and test results, and record survey documentation which occurred from December 1992 through July 27, 1993. The Module 2 leachate collection system and sand drainage layer is currently isolated from the leachate collection system and drainage layer in the active landfilling area (Module 1) by a three foot clay block. The clay block will be removed as a part of the final liner system tie-in activities which will occur after the review and approval of this documentation report by the Colorado Department of Health and the Weld County Health Department. We have scheduled to complete the final liner tie-in activities between Modules 1 and 2 and commence landfill activities in Module 2 during the week of September 20, 1993, subject FILE: nw 43543606, w/enc. & 3.2.93 C:\WP51\PM93\43606RPT.L1 F. ti, O Q Mr. Steve•Laudeman Mr. John Pickle Mr. Chuck Cunliffe September 10, 1993 Page 2 to the completion of your review and approval of the enclosed report. Tie-in activities will include: o Removing the three foot clay block; o Removal of the Module 1 temporary leachate collection sump; o Connection of the leachate collection system between Modules 1 and 2; o Completion of the sand drainage layer within the tie-in area; and o Preparation of a CQA letter report documenting liner system tie-in activities (for inclusion within Appendix G of this report). In order for the tie-in activities and landfilling to proceed in accordance to this schedule your approval of the enclosed report is needed by September 17, 1992. If this does not allow sufficient time for you to review the report, please contact me as soon as possible. If you have any questions during your review of this CQA documentation report, please feel free to contact Chip Wertz - WSC Project Manager (303) 699-0669, Mark Sebesta - GCS Project Manager (303) 980-0540 or me at (303) 330-2641. Sincerely, Bill Hedberg Division Vice President - Landfill Operations Enclosure • CW/cw cc: Roger Doak, CDH, w/o enclosure Trevor Jiricek, WCHD, w/o enclosure Mark Sebesta, GCS, w/o enclosure Todd Thomas, Tarco, w/o enclosure Gary Cantrell, RUST, w/ enclosure Chip Wertz, WMC, w/ enclosure Tom Buchholz, WMC, w/o enclosure Alan Scheere, WMC, w/ enclosure FILE: nw 43543606, w/enc. & 3.2.93 C:\WP51\PM93\43606RPT.L1 Waste Services Corporation 6037 77th Avenue Greeley, Colorado 80634 A Waste Management Company 303/330-2641 August 27, 1993 Mr. Chuck Cunliffe - - Weld County Department of Planning Services 1400 North 17th Avenue Greeley, Colorado 80631 - Dear Mr. Cunliffe: In accordance with Section 34 of the approved Certificate of Designation Development Standards for the. North Weld Sanitary Landfill (NWSL), , Waste. Management Disposal Services of Colorado, Inc. , aka Waste Services Corporation, hereby files this minor change with the Weld County Department of Planning Services. The change would identify the hours of operation as the following: The NWSL is generally operated Monday through Saturday from 7: 00 a.m. to 4 : 00 p.m. The facility will generally be closed on. Sundays and major holidays. Facility hours may be extended before, during, and after a holiday to accommodate hauling companies modified schedules. Actual facility hours may also vary depending on seasonal weather conditions and other ,operational variables. The entrance gate is attended at all times when the facility is open to receive solid waste. Any changes in the general operating hours will be posted at the entrance gate at least 24 hours prior to such change. With this change, the NWSL will be able to further minimize the potential health and safety risk and potential nuisance factors for Weld County residents. We are striving to provide this additional service in a well managed and environmentally sound manner and to continue to meet the current and future needs of the citizens of Weld County. Should you have any questions concerning this minor change, please contact me at your convenience at 686-2800. Sincerely, - Bill Hedberg D Division V.P.- Landfill Operations SEP 2 y 1993 \\ BH.hjw planniri9 Meld taiga cc: John Pickle, WCDH - 0 • . . • . . • . . . , . . . . . . .. .. .. .. . . . • . . . . . . .: , . .Ii-,'Y^-- . _"+i-+-,C� , { �' '' i, • 'Haste Services Corporation Q ?Q. ' 0037 77th Avenue Greeley, Colorado 80634 �,. A Waste Management Company 303/330.2641 August 18, 1993 Mr. Steve Laudeman Colorado Department of Health HMWMD - SWIM-B2 4300 Cherry Creek Drive South Denver, Colorado 80222-1530 D rT Mr. John Pickle, MSEH " Weld County Health Department AUG 1 9 1993 1517 16th Street Weld C Greeley, Colorado 80631 �aatyPlanning Mr:Chuck Cunlffe�. ;TTI LWel'dLLCounty Departirie�tnt of Planning Services 915 10th Street Greeley, Colorado 80631 SUBJECT: NORTH WELD SANITARY LANDFILL PHASE 1, MODULE 2 CELL CONSTRUCTION CQA DOCUMENTATION REPORT Gentlemen: Enclosed for your review and approval is a copy of the Golder Construction Services, Inc. (GCS) report dated August 1993 entitled, "Final Report, Quality Assurance Monitoring During Construction of Phase 1 Module 2, North Weld Sanitary. Landfill, Weld County, Colorado". This report documents the Module 2 construction activities, construction quality assurance (CQA) monitoring and test results, and record survey documentation which occurred from December 1992 through July 27, 1993. The Module 2 leachate collection system and sand drainage layer is currently isolated from the leachate collection system and drainage layer in the active landfilling area (Module 1) by a three foot clay block. The clay block will be removed as a part of the final liner system tie-in activities which will occur after the review and approval of this documentation report by the Colorado Department of Health and the Weld County Health Department. We have scheduled to complete the final liner tie-in activities between Modules 1 and 2 during the week of September 20, 1993, subject to the completion of your review and approval. Tie-in activities will include: FILE: nw 43543606, w/enc. & 3.2.93 C:\WP51\PM93\43606RPT.L1 �R -n . ® Q Mr. Steve Laudeman Mr. John Pickle Mr. Chuck Cunliffe August 18, 1993 Page 2 o Removing the three foot clay block; o Removal of the Module 1 temporary leachate collection sump; o Connection of the leachate collection system between Modules 1 and 2; o Completion of the sand drainage layer within the tie-in area; and o Preparation of a CQA letter report documenting liner system tie-in activities (for inclusion within Appendix G of this report). The first acceptance of municipal solid waste within Module 2 is anticipated to occur prior, to October 1993. If this does not allow sufficient time for you to review this report, please contact me as soon as possible. If you have any questions during your review of this CQA documentation report,please feel! free to contact Chip Wertz - WSC Project Manager (303) 699-0669, Mark Sebesta - GCS Project Manager (303) 980-0540 or me at (303) 330-2641. Sincerely, &9494Ltitlitthltel. Bill Hedberg Division Vice President - Landfill Operations Enclosure CW/cw cc: Roger Doak, CDH, w/o enclosure Trevor Jiricek, WCHD, w/o enclosure Mark Sebesta, GCS, w/o enclosure Todd Thomas, Tarco, w/o enclosure Gary Cantrell, RUST, w/ enclosure Chip Wertz, WMC, w/ enclosure Tom Buchholz, WMC, w/o enclosure Alan Scheere, WMC, w/ enclosure FILE:nw 43543606,w/enc. & 3.2.93 C:\WP51\PM93\43606RPT.L1 © STATE OF COLORADO COLORADO DEPARTMENT OF HEALTH co � Dedicated to protecting and improving the health and Nt,; a environment of the people of Colorado ,2 W * 4300 Cherry Creek Dr.S. Laboratory Building "4' •'". Denver,Colorado 80222-1530 4210 E.11th Avenue r87b Phone(303)692-2000 Denver,Colorado 80220-3716 (303)691-4700 Roy Romer Governor June 18, 1993 Patricia A.Noun,MD,MPH Executive Director Mr. Bill Hedberg Waste Services Corporation 6037 77th Avenue Greeley, CO 80634 RE: MODIFICATION OF SPECIFICATIONS, PHASE I, MODULE 2 NORTH WELD SANITARY-LANDFILL (NWSL) Dear Mr. Hedberg: The Hazardous Materials and Waste Management Division of the Colorado Department of Health (the Division) has reviewed supplemental information provided regarding Waste Services Corporation's (WSC) request for a modification of secondary specifications for construction of clay liner at the above referenced facility. This information consisted of the following: 1. `On-Site Clay Suitability and Borrow Evaluation Report' prepared by ATEC and dated April 22, 1993. 2. Letter from Golder Construction Services dated June 15, 1993 • 3. Letter from RUST Environment and Infrastructure dated June 15, 1993 These documents detail preconstruction testing that has been performed on the three types of clay material to be used in Phase I, Module 2 liner barrier layer construction and the developement of an alternative construction Qiiality Assurance/Quality Control (QA/QC) specification based on this testing. The Division approves the proposed alternative specification with the following conditions: 1. The QA/QC envelopes developed in the letter from RUST shall be incorporated into the Construction QA/QC plan for the project. 2. The recommendations contained in the ATEC report cited above shall be incorporated into the Construction QA/QC plan. 3. No reduction in the testing frequency for hydraulic conductivity shall take place at this time. This requirement may be reconsidered after completion of the Division's review of the Construction QA/QC results for this project., 0 O Mr. Bill Hedberg June 16, 1993 Page 2 Please address the above conditions with a written response. If you have any questions regarding the content of this letter, please contact me at (303) 692-3462. Sincerely, Step en Lau eman Geological Engineer Solid Waste Section Hazardous Materials and Waste Management Division __ cc: CC: Cu 1liffe, WeidrC-ounty-Planning-Services---y J. Pickle, Weld County Department of Health R. Doak, CDH HMWMD SWIM A Scheere, Waste Services Corporation File: SW/WLD/NWC 1\1 JUN.? 0 1993 " " "I Planninm MEMORAnDUM Wilk Chuck Cunliffe, Planning June 14, 1993 To Date COLORADO Trevor Jiricek, Environmental Protection/ From North Weld S.L.F. , Moisture Content Modification Request Subject: In regard to Waste Services Corporation request of May 27, 1993 (attached) , in which the North Weld Sanitary Landfill requested to modify the moisture content for the clay liner in Module 2. The Division approves of the modification provided that the facility demonstrate in a comprehensive document prior to construction that the modification will not inhibit the ability of the liner to achieve a permeability of 1X10-7 cm/sec or less, as well as other specifications as previously required in USR-895. The Division considers this change to be minor. This in addition to any requirements by the Colorado Department of Health. TJ/1102 J aiv JUN 141993 U� po, --9111oniAr 11, © © • STATE OF COLORADO COLORADO DEPARTMENT OF HEALTH E 0t:coto Dedicated to protecting and improving the health and ,,, ` environment of the people of Colorado r, ., p 4300 Cherry Creek Dr.S. Laboratory Building w.•"' * Denver,Colorado 80222-1530 4210 E.11th Avenue r87s Phone(303)692-2000 Denver,Colorado 80220-3716 (303)691-4700 Roy Romer Governor June 10, 1993 Patricia A.Nolan,MD,MPH Executive Director Mr. Bill Hedberg Waste Services Corporation 6037 77th Avenue Greeley, CO 80634 RE: MOISTURE CONTENT SPECIFICATIONS, PHASE I, MODULE 2 NORTH WELD SANITARY LANDFILL (NWSL) Dear Mr. Hedberg: The Hazardous Materials and Waste Management Division of the Colorado Department of Health (the Division) has reviewed Waste Services Corporation's (WSC) request for a modification of secondary specifications for construction of clay liner for the above referenced facility. The North Weld Sanitary Landfill is a 119 acre solid waste facility located 15 miles east of Fort Collins on State Highway 14. The requested modification of secondary specifications is: "Modify the moisture content specification from zero to four percent of optimum to minus four percent to plus four percent of optimum." Telephone conversations with Mark Sebesta of Golder Construction Services and Gary Cantrell of RUST Environment and Infrastructure indicate that WSC will be applying a non- traditional method of construction QA/QC for the proposed clay liner construction similar to that detailed by David E. Daniel and Craig H. Benson in ASCE Journal of Geotechnical Engineering Paper No.25333. Based on results of pre-construction testing on each material type to be used, Daniel's results indicate that material of lower moisture content could meet a hydraulic conductivity specification if higher levels of compaction were achieved. The pre- construction testing specified by Daniel includes three compaction tests and up to 18 hydraulic conductivity tests for each material to be used in construction. Additionally, the Division has contacted the Civil Engineering Department of the University of Colorado. The concerns expressed by CU center around the high dry strength characteristics of high plasticity clays that may disallow adequate compaction even under very high compactive effort. JUN 1 4 1993 1.1I -,Pianninr O D Mr. Bill Hedberg June 10, 1993 Page 2 The Division will recommend approval of the modified secondary specification only if WSC can demonstrate that, for each material type to be used in Module 2 clay liner construction, for a moisture content 4% below optimum at a realistically achievable level of compaction, that material will meet the primary hydraulic conductivity specification of 1 x 10-' cm/sec. Sincerely, Sire Stephen Laudeman Geological Engineer Solid Waste Section Hazardous Materials and Waste Management Division c: (`iunliffe `t.Weld ruityrnlannin-g Se ices J. Pickle, Weld County Department of Health R. Doak, CDH HMWMD SWIM A. Scheere, Waste Services Corporation File: SW/WLD/NWC Q mEmoRAnDum WII D e Chuck Cunliffe, Planning June 1, 1993 To Date -�� COLORADO Trevor Jiricek, Environmental Protectiot{� DU Fromil,, Subject: North Weld Sanitary Landfill, Liner Construction The Environmental Protection Division has reviewed the documents (attached) submitted by Waste Services, dated April 27, 1993, regarding the requested alternative design of the landfill liner construction. The Division approves of the enhancements as proposed, contingent upon approval from the Colorado Department of Health. The Division considers these proposed changes to be minor. If you have any questions, you may contact me at 2226. /tj-1026 7 JUN 0 2 1993 /I —� Waste Services Corporation „4 6037;77tN Avenue Greeley, Colorado 80634 A Waste Management Company 303/330-2641 May 27, 1993 Mr. Chuck Cunliffe Weld County Department of Planning Services 1400 N. 17th Avenue Greeley CO 80631 RE: NORTH WELD SANITARY LANDFILL (NWSL) PHASE I, MODULE 2, MOISTURE CONTENT MODIFICATION Dear Mr. Cunliffe: Waste.Services Corporation (WSC) has commenced excavation activities for the construction of Phase I, Module 2 at North Weld Sanitary Landfill(NWSL). In accordance with the Certificate of Designation (CD) Development Standard 7b, the primary goal and specification for construction of clay liner is to ensure a maximum permeability of 1x10-7 cm/sec or less. Development Standard 7b also requires secondary specifications as follows: 1) Compaction of 6 inch lifts to a minimum of 95% standard proctor density (ASTM D-698) 2) The moisture content of the clay liner material to be maintained from zero to four percent of the optimum moisture content 3) Clay liner material classification specifying a Plasticity Index (PI) of greater than ten and a gradation with at least 50 percent passing the number 200 sieve. WSC recommends a minor modification to the secondary specifications in Development Standard 7b. This recommendation is based upon results of the 1991 clay liner test fill, the 1991 Module 1 construction and additional site characterization conducted by WSC, which included an extensive evaluation of clay resources. Based on the above investigations and activities, the performance of the onsite clay material indicates that a moisture content range of -4 percent to +4 percent of optimum, while controlling the percent saturation of the clay liner material, will achieve the permeability specification of 1x10-7 cm/sec or less. Allowing the liner to be placed with a lower moisture • content will minimize the potential for liner desiccation prior to placement of the drainage layer/protective cover over the liner. Therefore, WSC hereby files the following as a minor change in accordance with Section 34 of the CD Development Standards:. wp51\as\05269311.wch P: NWSL 9.1.2/3.1 Co) O • Mr. Chuck Cunliffe May 27, 1993 Page 2 • Modify the moisture content specification from zero to four percent of optimum to minus four percent to plus four percent of optimum. By copy of this letter, WSC request written concurrence from the Colorado Department of Health and Weld County Health Department concerning the moisture content modification. WSC would appreciate your prompt response as we intend to commence with liner construction early in June, 1993. Should you have any questions or require additional information on this matter, please call Bill Hedberg or Alan Scheere at 686-2800. Sincerely, Sal rest Bill Hedberg Alan Scheere Division V.P. Landfill Operations Environmental Specialist AS/mmp cc: John Pickle, WCDH Roger Doak, CDH Mark Sebesta, Golder MAY 2 es 1993 U "r nicnnirr wp511as1Q5269311.wch F: NWSL 9.1.2/3.1 • ‘111110 CIS Waste Services Corporation 6037 77th AvCnue Greeley, Colorado 80634 A Waste Managomont Company 303/330-2641 . • May 21, 1993 II JUN 0 7 1993 Ili Mr. John Pickle ni7nnr Weld County Department of Health 1517 16th Avenue Court Greeley CO 80631 SUBJECT: NORTH WELD SANITARY LANDFILL (NWSL) PHASE I, MODULE 2 Dear Mr. Pickle: Based on the May 3, 1993 preconstruction meeting the following information has been revised and is provided to keep you appraised of the project. Please disregard our previous letter dated May 4, 1993. - Project Manager: Chip Wertz/Alan Scheere 770-3324 Earth Moving Contractor: . TARCO, Inc. Todd Thomas/Kelly Cooper 429-2221 Quality Assurance Monitoring: Golder Construction Services, Inc. Mark Sebesta/Kerry Bayer 980-0540 - Surveying Services: Montgomery-Phillips, Inc. Bill Phillips 989-3383 - Project Engineering: RUST, Environment & Infrastructure, Inc. Mike Heinstein 694-6660 Facility Contact: Bill Hedberg 686-2800 The anticipated schedule for key project components is as follows: PROJECT BEGINNING DATE ENDING DATE Mobilization May 3 May 9 Module Excavation May 3 June 12 • Clay Liner May 31 June 19 Lcachate Collection System June 21 July 3 I.cachate Collection Stamp June 21 June 28 W I'.111AM1IRII to 1I,L1'pl1 14 1111411.1.1 • i • f ' Letter John Pickle May 21, 1993 Page 2 Protective Layer May 17 June 5 Drainage Layer June 21 July 3 Surface Water Control May 3 July 17 Culverts June 7 June 12 Documentation Report May 3 July 26 Agency Review of Documentation Report July 26 August 23 Liner Tie-in August 23 August 31 Start of Landfilling September 1 Documentation Report for Tie-in August 23 September 7 As with the Module I construction project, we will be having weekly construction meetings at the site to review progress, resolve problems and to update the schedule. This year the meetings will be held each Wednesday at 10:00 a.m. If you have any questions regarding the Phase I Module 2 project, or would like to attend the weekly construction meetings, please call me at 770-3324. Sincerely, Alan Scheere Environmental Specialist AS/mmp cc: Trevor Jiricek, WCDH €Chuck Cunliffe;WCPD7 Roger Doak, CDH Todd Thomas, TARCO Mark Sebesta, Golder Construction Services Mike Heinstein, RUST Bill Phillips, Montgomery-Phillips Tom Buchholz, WMC Tom Schweitzer, WMC Chip Wertz, WMC Bill Hedberg, WSC W 1311A 4105019.11.1.C U I I I': NWSI.3.1 ill z `� • © D � NMS 'casement of North America, Inc. mo Greenwoodsn 5660 Grewo Plaza Blvd.•Suite 400 Englewood, Colorado 80111 303/770-3324 May 4,,1993 Mr. John Pickle Weld County Department of Health 1517 16th Avenue Court Greeley CO 80631 SUBJECT: NORTH WELD SANITARY LANDFILL (NWSL) PHASE I, MODULE 2 Dear Mr. Pickle: For your information and to keep you apprised of our activities at NWSL, Phase I, Module 2, construction project will begin May 3, 1993. The project is scheduled for completion by November 24, 1993. Project organization, including key project contacts are summarized below: . - Project Manager: Chip Wertz/Alan Scheere 770-3324 - Earth Moving Contractor: TARCO, Inc. Todd Thomas/Kelly Cooper 429-2221 - Quality Assurance Monitoring: Golder Construction Services, Inc. Mark Sebesta/Kerry Bayer 980-0540 - Surveying Services: Montgomery-Phillips, Inc. Bill Phillips 980-0540 • - Project Engineering: RUST, Environment & Infrastructure, Inc. Mike Heinstein 694-6660 - Facility Contact: Bill Hedberg 686-2800 The anticipated schedule for key project components is as follows: PROTECT BEGINNING DATE ENDING DATE Mobilization May 3 May 9 Module Excavation •May 3 June 12 Surface Water Control . May 3 July 17 Documentation Report May 3 July 26 WP51\AS\050393L1.CDH F: NWSL3.1 . tt, • 47-,‘ r^ i • I I Protective Layer 05 ° • }' May 17 June 5 to 1993 Clay Liner May 31 June 19 Culverts - • June 7 June 12 Leachate Collection System. June 21 July 3 Leachate Collection Sump June 21 June 28 Drainage Layer June 21 July 3 Agency Review July 26 August 23 • Liner Tie-in August 23 August 31 Documentation Report for Tie-in August 23 September 7 Start of Landfilling September 1 As with the Module I construction project, we will be having weekly construction meetings at the site to review progress, resolve problems and to update the schedule. This year the meetings will be held each Wednesday at 10:00 a.m. If you have any questions regarding the Phase I Module•2 project, or would like to attend the weekly construction meetings, please call me at 770-3324. • Sincerely, Alan Scheere Environmental Specialist • cc: LTrevor Jirieek;WC-DH Chuck Cunliffe, WCPD Roger Doak, CDH • Todd Thomas, TARCO Mark Sebesta, Golder Construction Services Mike Heinstein, RUST - Bill Phillips, Montgomery-Phillips Tom Buchholz, WMC Tom Schweitzer, WMC Chip Wertz, WMC Bill Hedberg, WSC • WP51\AS\050393L1.CDH • F: NWSL3.1 ' 6 OFFICE OF COUNTY ATTORNEY PHONE(303)356-4000 EXT.4391 P.O. BOX 1948 GREELEY,COLORADO 80632 . . O C� April 30, 1993 COLORADO James S . Chamness, P.G. " cal 0 Senior Project Manager Rust Environment & Infrastructure MAY 0 3 1993 1.1 6143 South Willow Drive, Suite 200 Englewood, CO 80111-5123 ' -FAIrriew Dear Mr. Chamness : You have indicated that Rust Environment & Infrastructure (REI) wishes to compete for engineering work for the North Weld Landfill operated by Waste Services Corporation, a subsidiary of Waste Management of North America. You have disclosed that there is some common ownership of the ultimate parent company of Waste Services and Rust E & I . You have provided a letter of March 5, 1993 and literature on Rust E & I . I have consulted with the County Health Department and Department of Planning Services . The County staff does not object to Rust E & I testing and evaluation during liner and cap construction and quarterly inspection for the North Weld site provided that the representations made in the March 5, 1993 letter and accompanying Statement of Qualifications and are accurate and complete. I note, in particular, that there would be no ownership relationship between the installers of the liner and that you advised me by phone that Rust E & I must compete for contracts with other completely unrelated engineering firms . This letter is not intended to be used in connection with any other operation conduction by Waste Management of North America or its subsidiaries or affiliates . You tru% ` e D. Morrison Assistant Weld County Attorney LDM/db pc: Planning Department Environmental Health Waste Services Corporation 6037 77th Avenue A Waste Management Company Greeley, Colorado 80634: '1303/330-2641 • April 27, 1993 Mr. Chuck Cunliffe ADP 2 y 1993 • Weld County Department of Planning Services `I • 1400 N. 17th Avenue Greeley CO 80631 John Pickle Weld County Department of Health 1517-16 Avenue Court Greeley CO 80631 SUBJECT: NORTH WELD SANITARY LANDFILL LINER CONSTRUCTION Dear Mr. Cunliffe and Mr. Pickle: Waste Services Corporation (WSC) is preparing to construct the liner for Module 2 of Phase I • at the North Weld Sanitary Landfill (NWSL). Development Standard 7b of the Certificate of Designation (CD) for NWSL• calls for a two foot thick recompacted clay liner with a permeability equal to or less than 1x10° cm/sec. Consistent with the Module 1, Phase I liner constructed in 1991, WSC is planning to construct a three foot thick recompacted clay liner with a permeability equal to or less than 1x1O' cm/sec, for Module 2 as well as for disposal areas to be constructed in future years at the site._Enclosed for your information are the construction plans for the Module 2 liner project. The request to proceed with the 1991 liner enhancement was presented in an August 28, 1991 letter to the Weld County Department of Health (WCDH). The letter also requested enhancements related to the leachate collection system, the addition of an aggregate drainage layer, and the addition of a protective soil cover. A copy of this letter, in addition to WCDH's September 13, 1991 approval, is attached. With the exception of increasing the liner thickness, all of the enhancements described in the August 28 letter were intended for future liner projects at the site as well as for the 1991 project. The request to increase the liner thickness to three feet was for the 1991 project only in order to allow for additional geotechnical investigation of the quality and quantity of in-situ clays and claystones at the site. Based on the results of this investigation, WSC indicated in its August 28 letter that it would reevaluate liner options and then propose a fmal liner section. In 1992, WSC completed the additional geotechnical investigation of the availability of onsite clays and claystones. The results of the investigation indicate that onsite clay material is of sufficient quantity and quality to continue using a three foot thick section for future liner wp511aMIettu\04229311.wch F: NWSL 3.2.93 . a 0 O Letter Chuck Cunliffe/7ohn Pickle April 27, 1993 Page 2 construction at the site. Accordingly, WSC requests WCDH's approval to continue using a three foot thick recompacted clay section for liner construction at NWSL. WSC also hereby files this enhancement as a minor change with the Weld County Department of Planning Services in accordance with Section 34 of the Certificate of Designation Approval Development Standards for NWSL. Additionally, -WSC contracted with RUST Environment and Infrastructure (RUST) to demonstrate that the three foot thick clay liner design for NWSL meets the RCRA Subtitle D performance standard set forth in 40 CFR 258.40. RUST's demonstration and conclusions are presented in the enclosed report entitled "North Weld Sanitary Landfill Alternative Design Evaluation" dated April 14, 1993. The report concludes that the present NWSL liner design exceeds the requirements concerning leachate constituent concentrations in groundwater at the point of compliance (POC) for the site. Computer simulations predict that under the present design specifications, leachate concentrations at the P0C will be several times lower than the USEPA Primary Drinking Water Maximum Contaminant Levels. WSC is planning to commence liner construction activities for Module 2 in early May. Your prompt review of this request will be appreciated. By copy of this letter, review and comment by the Colorado Department of Health (CDH) is also requested. Please call Bill Hedberg at 330-2641 or Alan Scheere at 770-3324 if you have questions during your review of this request. Sincerely, ia attrl llt- Bill Hedberg Alan Scheere Division V.P. Landfill Operations Environmental Specialist Enclosures - • cc: Roger Doak, CDH w/enclosures Trevor Jiricek, w/o enclosures • wp51 W Uevgr\03229311.weh F: NWSL 3.2.93 o 4 Waste Management of Noith America, Inc. Mountain Region 5660 Greenwood Plaza Blvd.•Englewood.Colorado 80111 Suite 424.303/770-3324 August 28, 1991 . Mr. Wes Potter, Director . Environmental Protection Services Weld County Health Department • 1517 16th Avenue Court Greeley, Colorado 80631 . • SUBJECT: NORTH WELD SANITARY LANDFILL Dear Mr. Potter: • Waste Services Corporation (WSC), an affiliate of Waste Management of Colorado, Inc. (WMC), is initiating design efforts to construct the first disposal cell at the North Weld Sanitary Landfill(NWSL). Based on review of the Design and Operations Plan for the site, WSC requests approval by the Weld County Health Department for the following enhancements to the liner and leachate collection system. These enhancements are requested in order for the site to more closely reflect WMC corporate guidelines. - Include a leachate clean-out riser at the upgradient end of the leachate collection line (Attachment 1). • - Increase the compacted clay liner thickness from two feet to three feet (Attachment 2). This increase is requested for lining of the first (1991) disposal cell only. After additional geotechnical investigation of the site is performed and the quality and quantity of the in-situ clays and claystones are further characterized,we wish to reevaluate liner options and propose a final section based on this information. WSC intends to perform the investigation prior to the 1992 construction season. ▪ Include a 1 foot thick aggregate drainage layer over the liner at the base of the disposal cell with a permeability of no less than 1 x 104 cm/sec (Attachment 2). The purpose of the drainage layer is to enhance movement . of any liquid within the disposal cell to the leachate collection trench and to prevent desiccation cracking of the liner. . - Include a 1 foot thick protective soil cover over the side slopes of the liner to prevent desiccation cracking of the liner (Attachment 1). . - The above enhancements relating to increasing the liner thickness and adding the drainage • and protective layers will necessitate modifying what the elevation contours represent on the . Base Grade Map, Plate 7, of the NWSL Design and Operations Plan. The contours shown on Plate 7 currently represent the top of the liner with the base of the excavation being approximately two feet lower. With these enhancements, the contours would reflect the top Letter to Mr. Wes Potter August 28, 1991 Page 2 of the drainage layer (for the disposal area bottom) and the protective cover (for the. disposal area side slopes) with the base of the excavation being approximately four feet lower. A reduced copy of Plate 7 reflecting this modification is included as Attachment 3. In addition to the above, WSC requests approval to use an alternative method for joining the sections of the leachate collection line. The method currently approved for the site consists of using a glued joint. Given the potential for constituents in the glue impacting leachate quality, WSC requests approval to use bell and spigot connections with two number seventeen (#17) one inch long stainless steel hex head tapping screws per connection. As you observed during your site visit on August 7, 1991, excavation activities have commenced for the first disposal cell in the northwest, upgradient corner of Phase I. As additional airspace is required in future years, cell development will continue to the east in Phase I, terminating at the leachate collection sump shown on Plate 7 (Attachment 3). Until such time as the collection sump is constructed, temporary sumps will be required. A detail of the temporary sump WSC proposes for use at NWSL is included as Attachment 4. As future disposal cells are constructed, the temporary sump will be removed and a new sump will be constructed at the downgradient end of the extended leachate collection system. Your prompt review of this request will be appreciated. By copy of this letter, review and comment by the Colorado Department of Health (CDH) is also requested. Please call me should you have questions or require additional information during your review of this request. Sincerely, Tom Schweitzer, P.E. Environmental Engineering Manager TS/mak Attachments cc: Austin Buckingham, CDH Brad Keimes, WSC t:\ts\082791L1.d0c DEPARTMENT OF HEALTH IF T• r 1517• 16 AVENUE COURT I ,^- V L GREELEY, COLORADO 80631 W I C ADMINISTRATION (303)353-0586 • O .N-•-• I ��r; HEALTH PROTECTION (303)353-0635 V COMMUNITY HEALTH (303)353-0638- COLORADO Sept ber 13, 1991 Mr. Tom Schweitzer • Environmental Engineering Manager Waste Management of Northern Colorado, Inc. Mountain Region 5660 Greenwood Plaza Boulevard - Suite 424 • Englewood, Colorado 80111 • Dear Sir: The staff has reviewed the proposed enhancement to the North Weld Sanitary Landfill submitted to our office on August 28, 1991. It is our understanding that these enhancements are intended to improve the overall design and construction of the landfill west of Ault, Colorado. It appears that the proposed changes would increase the liner thickness and add enhancements to the drainage layer by including a foot-thick aggregate drainage layer over the liner at the base of the disposal cells and provide for a foot-thick protective soil _ cover over the side slopes of the liner to prevent desiccation. All of these enhancements, from our perspective, appear to be very positive with regard to the overall design of the landfill. They would improve the construction and further reduce the potential for negative environmental impact associated with the facility. The Department approves of the enhancements as proposed, conditional upon approval from the Colorado Department of Health, Waste Management Division. The staff from the Colorado Department of Health has indicated that there are additional enhancements that they would request with regard to some aspects of liner configuration and leachate sump configuration and Weld County Health Department endorses those recommended changes. The Division does not consider these minor enhancements to be a significant change with regard to the entire facility and its operation. If you have further questions, do not hesitate to contact this office. Sincerely, WO 1456k - Wes Potter, Director Environmental Protection Services WP/1f-444 1 •eflet DEPARTMENT OF HEALTH \ - 1517-16 AVENUE COURT I GREELEY,COLORADO 80631 C ADMINISTRATION(303)353-0586 O HEALTH PROTECTION (303)353-0635 COMMUNITY HEALTH (303)353-0639 COLORADO . July 7, 1993 William J. Hedberg — - - - - _ Waste Services Corporation 40000 Weld County Road 25 Ault, Colorado 80610 Dear Mr. Hedberg: On June 24, 1993, a representative of the Environmental Protection Division of the Weld County Health Department inspected the North Weld Sanitary Landfill, located at 40000 Weld County Road 25, Ault, in Weld County, Colorado. The purpose of the inspection was to inspect and assess the facility's compliance with the "Regulations Pertaining to Solid Waste Disposal Sites and Facilities" as promulgated by the Solid Waste Disposal Sites and Facilities Act, Title 30, Article 20, Part 1, C.R.S. , as amended, and the Development Standards as set forth in U.S.R.-895. On this date, this facility was found to be in compliance with both the "Regulations Pertaining to Solid Waste Disposal Sites and Facilities" and the Development Standard set forth in U.S.R.-895. If you have any questions regarding this inspection, please contact this office at 353-0635. Sincerely, • —ik L iL Trevor Jiricek Solid and Hazardous Waste Specialist TJ/1285 cc: Roger Doak, Colorado Department of Health Keith Schuett, Weld County Planning Department Lee Morrison, Weld County Assistant Attorney Alan Scheere, Waste Management of North' America, Inc. C IVE JUL 0 9 1993 {I r„v er- ArP> ng Waste Management of North America, Inc. Mountain Region 5660 Greenwood 5660 G Plaza Blvd. •Suite 400 � Englewood, Colorado 80111 N ``` 303/770-3324 1U` MAY 06 May 4, 1993 \ +.tQ1B OW Mr. John Pickle Weld County Department of Health 1517 16th Avenue Court Greeley CO 80631 • SUBJECT: NORTH WELD SANITARY LANDTML (NWSL) PHASE I, MODULE 2 Dear Mr. Pickle: • For your information and to keep you apprised of our activities at NWSL, Phase I, Module 2, construction project will begin May 3, 1993. The project is scheduled for completion by November 24, 1993. Project organization, including key project contacts are summarized below: Project Manager: Chip Wertz/Alan Scheere 770-3324 Earth Moving Contractor: TARCO, Inc. Todd Thomas/Kelly Cooper 429-2221 Quality Assurance Monitoring: Golder Construction Services, Inc. Mark Sebesta/Kerry Bayer 980-0540 Surveying Services: Montgomery-Phillips, Inc. Bill Phillips 980-0540 • - Project Engineering: RUST, Environment & Infrastructure, Inc. Mike Heinstein 694-6660 • Facility Contact: Bill Hedberg 686-2800 The anticipated schedule for key project components is as follows: • PROJECT BEGINNING DATE ENDING DATE Mobilization May 3 May 9 Module Excavation •May 3 June 12 Surface Water Control May 3 July 17 • Documentation Report May 3 July 26 • WPM\AS\050393LI.CDH • F: NWSL3.1 . Protective Layer May 17 June 5 Clay Liner May 31 June 19 Culverts • June 7 June 12 Leachate Collection System June 21 July 3 Leachate Collection Sump June 21 June 28 Drainage Layer June 21 July 3 Agency Review July 26 August 23 Liner Tie-in August 23 August 31 Documentation Report for Tie-in August 23 September 7 Start of Landfilling September 1 As with the Module I construction project, we will be having weekly construction meetings at the site to review progress, resolve problems and to update the schedule. This year the meetings will be held each Wednesday at 10:00 a.m. If you have any questions regarding the Phase I Module 2 project, or would like to attend the weekly construction meetings, please call me at 770-3324. Sincerely, Sice Alan Scheere Environmental Specialist cc: Trevouiricek,,WCDH:R LChnck Cunliffe;WCPD Roger Doak, CDH Todd Thomas, TARCO Mark Sebesta, Golder Construction Services Mike Heinstein, RUST Bill Phillips, Montgomery-Phillips Tom Buchholz, WMC Tom Schweitzer, WMC Chip Wertz, WMC Bill Hedberg, WSC WP51WS\050393L1.CDH P: NWSL3.1 • r .`� DEPARTMENT OF HEALTH 1517.16 AVENUE COURT WIwe GREELEY,COLORADO 80631 ADMINISTRATION (303)353-0586 HEALTH PROTECTION(303)353-0635 COMMUNITY HEALTH (303)353-0639 COLORADO April 21, 1993 Bill Hedberg Waste Services Corporation - 6037 77th Avenue Greeley, Colorado 80631 Dear Mr. Hedberg: The Environmental Protection Division of the Weld County Health Department has completed the review of the First Quarter, 1993, Gas Monitoring, North Weld Sanitary Landfill, in Weld County, Colorado. The Division finds the document to be acceptable as submitted and has no further comment at this time. If you have further questions, please contact me at 353-0635. Sincerely, Awry mil( Trevor Jiri ec'k Solid and Hazardous Waste Specialist TJ/jg-727 - cc: Roger Doak, Colorado Department of Health Keith Schuett, Weld County Planning Department cU 14 APR 221993 llI gain 4.,nlgnain- Hello