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8LFR LEVINE-FRICKE May 15, 2002 003-07979-00-004 Mr. Robert McClellon San Joaquin County Environmental Health Division 304 East Webber Avenue, 3rd Floor Stockton, California 95202 Subject: Confirmation of Second Quarter 2002 Soil Gas Monitoring Data, Forward Landfill, San Joaquin County, California Dear Mr. McClellon: This letter report presents results of soil gas monitoring conducted by LFR Levine-Fricke (LFR) on behalf of Forward Incorporated (Forward) at the Forward Landfill located in San Joaquin County on May 8, 2002. Forward has retained LFR to conduct quarterly soil gas at this landfill. Soil gas monitoring conducted on May 1, 2002 revealed elevated methane concentrations in soil gas probe GP-10 located along the northern landfill boundary (between the Forward and Austin Road Landfills). GP-10 and other nearby soil gas probes (Figure 1) were again monitored on May 8, 2002. In accordance with CCR Title 27, Section 20937(a), this letter report is also being submitted to inform the enforcement agency (EA) that methane was detected above the lower explosive level (LEL) in Forward Landfill gas probe-10 (GP-10) at a concentration of 8.0 percent by volume on May 8, 2002. The methane detection likely reflects the temporary shut down of the Austin Road landfill gas extraction system for routine maintenance activities. The extraction system was shut off on March 25, 2002 for a period of approximately two weeks, and was turned back on April 8, 2002. The system was intermittently on and off for various repairs and checks and was turned back on April 25, 2002. Forward proposes continuing with the routine monitoring activities on a quarterly basis to confirm conditions under normal operating conditions. In accordance with CCR Title 27, Section 20937(a)(1), an evaluation was conducted by Forward personnel regarding the necessary immediate steps to protect public health and safety and the environment. At this time, Forward has concluded there appears to be no potential hazardous conditions based on field monitoring results of on-site buildings and ambient air. As shown on Table 1, monitoring of on-site facilities and ambient air in the vicinity of GP-10 on May 8, 2002 (no methane detected) confirms the previous findings. Procedures Perimeter landfill gas monitoring was conducted at two of Forward's landfill gas probes on May 8, 2002 by LFR personnel. Concentrations of methane, oxygen, and carbon dioxide within the two soil gas probes were monitored using a calibrated Landtec GEM 2000 gas analyzer and extraction 4080CavittStallmanRoad,Suite 100,Granite Bay,California 95746-9460 - (916)786-0320 - fax(916)786-0366 - www.Ifr.com Offices Worldwide