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8LFR <br /> LEVINE•FRICKE <br /> August 27, 2002 001-07979-00-001 <br /> SRDC� i]V)EDD <br /> Mr. Robert McClellon <br /> San Joaquin County Environmental Health Division AUG 2 8 2002 <br /> 304 East Webber Avenue, 3rd Floor ENVIRONMENT HEALTH <br /> Stockton, California 95202 PERMIT/SERVICES <br /> Subject: Third Quarter 2002 Soil Gas Monitoring Report, Forward Landfill, San Joaquin <br /> County, California <br /> Dear Mr. McClellon: <br /> This letter report presents results of soil gas monitoring conducted by LFR Levine-Fricke (LFR) <br /> on behalf of Forward Incorporated (Forward) at the Forward Landfill in San Joaquin County <br /> during the third quarter of 2002. Forward has retained LFR to conduct quarterly soil gas and <br /> water quality monitoring at the Forward Landfill. Soil gas monitoring was conducted on August <br /> 12, 2002 at the on-site structures and soil gas probe locations presented on Figure 1. <br /> LFR personnel were unable to locate landfill gas probes GP-1, GP-2, or GP-3. These three probes <br /> have apparently been buried with soil by earth moving equipment. As a result, no monitoring was <br /> conducted at these locations. According to Forward personnel, these three probes are scheduled <br /> to be replaced. <br /> Procedures <br /> Perimeter landfill gas monitoring was conducted at seven landfill gas probes during August 12, <br /> 2002 by LFR personnel. Concentrations of methane, oxygen, and carbon dioxide within the seven <br /> soil gas probes and buildings onsite were monitored using a calibrated Land tec GEM 2000 gas <br /> analyzer and extraction monitor (GEM). The GEM was certified as calibrated to factory <br /> specifications by the rental supplier, EquipCo, prior to each sampling event. <br /> At each pfobe, a reading of ambient air in the vicinity of the probe being tested was recorded <br /> before soil gas was monitored within the probe. Initially, the GEM was attached to the soil gas <br /> probe, the valve was opened, and the initial soil gas probe pressure was monitored and recorded. <br /> Then the GEM's internal pump was activated to extract soil gas from the probe. Readings for <br /> methane, oxygen, and carbon dioxide were monitored until the readings stabilized. After the <br /> readings were recorded, the internal pump was deactivated and the post-reading soil gas probe <br /> pressure was monitored and recorded. The soil gas probe valve was then closed, and the GEM <br /> was disconnected. The main office, maintenance yard buildings, and the weigh station were also <br /> monitored to assess potential gas accumulations at the foundations. The landfill gas probe and <br /> building locations are shown on Figure 1. <br /> 4080CavittStallmanRoad,Suite 100,Granite Bay,California 95746.9460 • (916)786-0320 • fax(916)786-0366 • www.ifr.com <br /> Offices Worldwide <br />