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- - s emM— Mvllftmw <br /> t <br /> ,. (for SB5-SB7,drilled by EA). Concentrations of TPH and BTEX less than 2 mg/kg have been <br /> measured in soil samples. <br /> Steil Vapor Surveys <br /> L' Two soil vapor surveys have been conducted at this site one b EA in 1987 and one b EVAX <br /> F Y Y Y <br /> € in 1990. The EVAX results indicated the presence of up to 19,000 ppm of TVH in the soil vapor <br /> beneafl the formes tank field. These results were used by EVAX to design and propose a soil <br /> senting remedial plan. <br /> 5. STATUS OF SOIL REMEDIATION <br /> � On behalf of E:ixon,EVAX Technologies has filed a soil venting work plan with the San Jaa <br /> chain C'ounry Environmental Health Department. Pending approval of this work plan,EVAX <br /> plans to construct a system to extract and treat soil vapors from the subsurface. <br /> 6. STATUS OF FREE PRODUCT PLUME DEFINITION <br /> Free product has not been detected at the site,nor is its presence suggested by the concentrations <br /> of the hydrocarbons in the groundwater. <br /> 7. STATUS OF FREE PRODUCT PLUME DEFINITION <br /> Free product remediation is not required. <br /> S. STATUS OF DISSOLVED CONSTITUENT PLUME DEFINITION <br /> Groundwater sampling has been done on an approximately quarterly schedule since late 1986. <br /> S <br /> Groundwater sampled from well MW3 during this time has contained higher concentrations of <br /> petrolenna constituents than water from the other four wells (Table 3). .Because MW3. (now <br /> replaced by lMl'W6)is surrounded by the other four well Iocations and no concentrations of TPH <br /> greater than 50µg/L and no concentrations.of BTEX greater than 0.5 gg/L have been detected in <br /> the outlying wells,the dissolved constituent plume appears to remain limited to the area immedi- <br /> fi ately around MW3(and MW6),directly beneath the former:tankfield (Figure 2). -- - . <br /> t= 9. STATUS OF DISSOLVED CONSTITUENT REMEDIATION <br /> Groundwater remediation is not currently planned. <br /> 10. WN17ER LEVEL RECORDS AND GRADIENT DETERMINATIONS <br /> 1 ' The depth to groundwater in each well was measured at the time of sampling, using an optical <br /> interface probe. Groundwater elevations were calculated using these data and top-of-casing <br /> +, e42n1050/ OY/txt 3 <br /> .. <br />