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INTRODUCTION <br /> General <br /> This Brief Technical Report is submitted in compliance with Regional Water Quality Control <br /> Board Order R5-2013-0024 (Item#1 page 10), which requires a"Brief Technical Document <br /> describing the extension of the closure cap at the Corral Hollow Sanitary Landfill". This project <br /> executed the revised and preliminary Final Cover Expansion Design(submitted April 23, 2012) <br /> which incorporated a low-density polyethylene (LLDPE) geomembrane, additional landfill gas <br /> collection wells and drainage improvements as directed and approved by Regional Water Quality <br /> Control Board Staff. <br /> This Report also includes a description of the installation of two perimeter landfill gas migration <br /> monitoring wells (soil gas wells)required in a violation received September 26, 2012. Because <br /> this requirement was received after the design of the closure project was complete,these wells <br /> were installed after the closure cap extension project was substantially complete under a separate <br /> contract. <br /> The closure area included a portion of property now owned by the State of California, <br /> administered by the Department of Transportation(Caltrans). Inclusion of Caltrans property was <br /> in accordance with the Memorandum of Understanding signed between the County and Caltrans <br /> on August 30, 2011 (Appendix Drawing 1). <br /> The final Certification Report for these projects will be submitted on or before November 1, <br /> 2013 in accordance with Order R5-2013-0013. <br /> Involved Parties <br /> Parties participating in this project include: <br /> • Construction contractor: RJ Gordon Construction Inc. The contract for this project at this <br /> site was awarded on February 19, 2013. <br /> t • Construction Quality Assurance: by Geo-Logic and Associates. <br /> • Construction management: the Field Division of San Joaquin County Public Works <br /> Department. <br /> • Assistance during construction: Shaw Environmental and Infrastructure(now Chicago <br /> Bridge and Infrastructure). <br /> • Installation of Soil Gas Wells: Gregg Drilling Inc. <br /> Brief Technical Certification Report 1 Department of Public Works/Solid Waste <br /> Corral Hollow Closure Cap Extension County of San Joaquin—September 6,2013 <br />