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California LLogional Water Quality Con 1 Board <br /> Central Valley Region <br /> Karl E.Longley,ScD,P.E.,Chair a <br /> Linda S.Adams Arnold <br /> Secreraryfor Sacramento Main Office <br /> Environmental Schwarzenegger <br /> 11020 Sun Center Drive 11200,Rancho Cordova,California 95670-6114 Governor <br /> Protection Phone(916)464-3291 •FAX(916)464-4645 <br /> h"p://www.waterboards.ca.gov/centralval ley <br /> 29 March 2007 <br /> Mr. Kevin Basso APR 1 2007 <br /> General Manager <br /> D?;6... i I <br /> Forward Inc. PEMhv' S ,°r� c <br /> 1145 West Charger Way <br /> Stockton, CA 95206 <br /> GROUNDWATER IMPACTS FROM,LANDFILL COVER COSNTRUCTION, FRENCH CAMP <br /> LANDFILL, SAN JOAQUIN COUNTY <br /> Staff has reviewed your 14 March 2007 letter `Groundwater Impacts from Landfill Cover <br /> Construction, French Camp Landfill'. In the letter Forward Inc. makes the case that the <br /> detected VOCs in groundwater are temporary. These detections were because of the <br /> construction of the recently completed cover, which added construction water to the landfill <br /> and/or changed the subsurface gas pressure. These are some of the changes that may occur <br /> from the installation of a new landfill cover. The VOC groundwater impacts could increase or <br /> dissipate as the landfill gases equilibrate. We concur at this time that it is premature to install a <br /> gas control system. Therefore, Forward Inc. at a minimum should monitor landfill gas <br /> quarterly for at least six quarters (through May 2008). By 31 July 2008, a report shall be <br /> submitted evaluating landfill gas and groundwater monitoring results. However, if the landfill <br /> gas increases significantly or groundwater concentrations continue to increase during this time <br /> period, the installation of a landfill gas control system may be required before the 31 July 2008 <br /> date. <br /> Staff understands that soil-pore gas probe SPG-1 appears to be damaged. SPG-1 should be <br /> repaired or abandoned and replaced as soon as possible. <br /> If you have any questions, please call me (916) 464-4614. <br /> Ross Atkinson <br /> Engineering Geologist <br /> Title 27 Unit <br /> cc: Mr. Robert McClellon, San Joaquin County LEA, Stockton <br /> Mr. Keith Kenndy, CIMWB, Sacramento <br /> Mr. Reuben Ramirez, Forward Landfill Operations Manager, Stockton. <br /> Mr. Lochlin Caffey, Forward Inc. Stockton <br /> Mr. Gary Lass, Geologic Associates, San Diego <br /> Ms. Sara Battelle, Geologic Associates, San Diego <br /> R DA;W:\staff\atkinsr\mydocuments\frenchcamp\G W impacts.doc <br /> California Environmental Protection Agency <br /> Zp®Recycled Paper <br />