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.................... <br /> ............. <br /> 4--- - San Joaquin County <br /> Environmental Health Department DIRECTOR <br /> Donna Heran,REHS <br /> 600 East Main Street <br /> PROGRAm cooRDiNAToRs <br /> Stockton, California 95202-3029 <br /> Robert McClellan,REHS <br /> Jeff Carruesco,REHS,RDI <br /> 7 <br /> Website:www.sJgov.org1ehd Kasey Foley,REHS <br /> Phone: (209)468-3420 <br /> Fax: (209)464-0138 <br /> October 13,2010 <br /> Chris Heiny, Staff Professional <br /> SCS Engineers <br /> 3117 Fite Circle,Ste 800 <br /> Sacramento,CA 95827 <br /> Subject: WORK PLAN FOR LANDFILL GAS SYSTEM UPGRADES AND <br /> PERIMETER PROBE CONSTRUCTION FORWARD LANDFILL (SWIS <br /> Facility No. 39-AA-0015). <br /> Dear Mr.Heiny, <br /> The Environmental Health Department(EHD)has received and reviewed your plan listed <br /> above and has the following comments: <br /> 1. The plan states that Forward Inc has submitted an application to revise the Solid <br /> Waste Facility Pen-nit(SWFP). As of today the EHD has not received a permit <br /> application to revise the SWFP from the Forward Inc.personnel. <br /> 2. The plan states at the top of page 3,that 10 Soil Vapor Extraction(SVE)wells will <br /> be installed.In the second paragraph on page 3,the plan states that 6 SVE wells <br /> will be installed. Please clarify and revise to reflect the actual number of SVE <br /> wells proposed for installation. <br /> 3. The plan needs to be implemented in phases. The wells located in the waste should <br /> be installed first. The SVE wells should be installed only after the gas extraction <br /> wells located in the waste are deemed not adequate. <br /> 4. The SVE wells need to be located outside the sphere influence of the perimeter <br /> monitoring points(GP12,GPI 1,GPIO). A minimum distance of 300 feet shall be <br /> maintained. The SVE wells should be clustered and position to collect the landfill <br /> gas without drawing the landfill gas into the perimeter monitoring probes. The <br /> prior installation of SVE wells along the western property boundary of the"Old <br /> Forward"site was not affective in controlling the landfill gas at the boundary. The <br /> methane concentrations in the compliance monitoring probes increased greatly <br /> shortly after bringing those wells online. <br /> Page 1 of 2 October 13,2010 <br />