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WASTE DISCHARGE REQUIREMENTS ORDER R5-2015-0058-01 -30- <br />SAN JOAQUIN COUNTY DEPARTMENT OF PUBLIC WORKS <br />FOOTHILL SANITARY LANDFILL, INC. <br />FOOTHILL LANDFILL <br />SAN JOAQUIN COUNTY <br /> <br />129. Each plan required under CAO R5-2004-0706 was ultimately submitted by the <br />Discharger and implemented as approved by Central Valley Water Board staff. Plans <br />and reports submitted/approved under CAO R5-2004-0706 for the Site Improvement <br />Project, included, but were not limited to, the following: <br />a. 31 August 2004 Project Design Report for the Site Improvement Project; <br />b. 15 November 2004 Partial Cover, Intermediate Cover, and Drainage and Erosion <br />Control Plan; <br />c. 21 September 2004 Landfill Closure Method Selection Report; <br />d. 30 January 2005 Preliminary Closure and Postclosure Maintenance Plan, <br />prepared by Kleinfelder; <br />e. March 2005 Landfill Gas Collection and Control System Design Plan, prepared <br />by GC Environmental, Inc., prepared by Kleinfelder; <br />f. 12 May 2005 Module “I” Partial Final Closure Plan (approved by Water Board <br />staff on 18 July 2005) , prepared by Kleinfelder; <br />g. 28 November 2005 ET Cover Design Report for the Foothill Sanitary Landfill Site <br />Improvement Project, prepared by Kleinfelder; and <br />h. 24 February 2007 Final Construction Quality Assurance Report, prepared by <br />Vector Engineering. <br />The above Final Construction Quality Assurance Report for the project was approved <br />by Water Board staff on 20 March 2007. The implementation of each component of <br />the Site Improvement Project is described in Findings of this Order applicable to that <br />aspect of the landfill design. <br />Landfill Gas Controls <br />130. The landfill gas (LFG) extraction system installed as part of the 2006 Site <br />Improvement Project included the installation of 9 vertical extraction wells (GX-1 <br />through GX-9) at Module I and 5 horizontal extraction wells (HC-1 through HC-5) at <br />LF-2, Module 1. Each vertical extraction well was spaced about 500 feet apart for an <br />estimated 250 foot radius of influence. The wells were completed to depths ranging <br />from 41 to 100 feet depending on waste column thickness. Each horizontal well was <br />designed for a 400 foot horizontal and 30 foot vertical radius of influence. Associated <br />LFG collection and treatment facilities included lateral and header piping (3” HDPE <br />and 12” HDPE); a condensate knock-out sump and a 1-inch diameter HDPE return <br />line to Module 1’s LCRS sump; two, 2,000 CFM blower motors; a flare station; and a <br />3.5 megawatt, 1,500 SCFM (standard cubic feet per minute) gas-to-energy plant. <br />131. The current landfill gas extraction rate at the site is approximately 1,200 SCFM. Since <br />2010, all LFG collected from the landfill has been piped to the gas-to-energy plant (in <br />the southeast corner of the site), which is owned and operated by Ameresco under an <br />agreement with the Discharger. Any remaining condensate is removed from the gas <br />at the plant, and the methane gas is used to fuel a generator and create electricity <br />which is exported for commercial use. Since start-up of the gas-to-energy plant, the <br />LFG flare station has been inactive. See Finding 81 (Leachate and Condensate <br />Management) and See Attachment E: Gas Controls & Monitoring.