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HomeMy WebLinkAbout0403_ChambersMSWLF_UnderdrainApproval_DIN 26268_20160615 PAT MCCRORY Governor DONALD R. VAN DER VA ART Secretary MICHAEL SCOTT Director June 15, 2016 Nelson Breeden, P.E. Waste Connections of the Carolinas 375 Dozer Drive Polkton, NC 28135 Re: Anson Cell 2C North Expansion – Underdrain Approval Chambers Development MSW Landfill - Anson County Permit #0403-MSWLF-2010 DIN 26268 Dear Mr. Breeden: The NC Solid Waste Section has reviewed information and plans submitted June 2, 2016 by CEC for the installation of an underdrain in the vicinity of planned Cell 2C North at the Chambers landfill. This information packet (DIN 26258) was prepared by Civil & Environmental Consultants after an initial request for underdrain approval on April 4, 2016 by CEC and after discussion with Section Engineer John Murray and Section Hydrogeologist Perry Sugg at the May 25, 2016 pre-construction meeting held onsite. A previous geologic evaluation of the site by David Garrett PG (SCS Engineers) that focused on isolated perched water conditions at the site and evaluated potential future encounters was submitted on July 7, 2015. This report (DIN 26257) was prepared as a condition of an underdrain approval for Cell 2C South at the request of the Section. A review of these reports and plans demonstrate seasonal high water table is at least 4-8 feet below the perched conditions and the underdrain will not intercept this seasonal high water table. Construction of the base liner will maintain the required minimum 4-ft separation of seasonal high water table. The site was also visually inspected by Perry Sugg during a May 11, 2015 and the May 25, 2016 site visits. Based on a review of the July 2015 evaluation and the June 2016 proposed plans, as well as our inspections of the site, approval for installation of the underdrain for Cell 2C North is granted with conditions. Conditions for approval are:  The facility will monitor flow data from all underdrains onsite on a monthly basis and will keep records onsite of all data collected  Cell 2C north underdrain will be inspected annually when the leachate collection system is inspected, and will be cleaned as needed  The water quality monitoring plan will be revised to include collection and analysis of all underdrain outflow samples as part of the semi-annual detection monitoring conducted as the site. Page 2 The CQA for the underdrain for Cell 2C will need to be included in the final report sent to the Section Permitting Engineer, John Murray. Contact the permitting Engineer for any additional engineering documentation or conditions that may be required, if any. If you have any questions, please feel free to contact John Murray at (252) 808.2808 or me at (919) 707-8258. With Best Regards, Perry Sugg, PG Permitting Hydrogeologist Cc: Ed Mussler, SWS Permitting Branch Head John Murray, SWS Permitting Engineer Ming Chao, SWS Permitting Engineer Scott Brown PE, CEC Inc. Nathan Bivins PE, CEC Inc.