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a <br /> : DRAFT <br /> 2. The plume of dissolved phase hydrocarbons is stable, concentrations of <br /> constituents are declining, and naturally occurring biodegradation of residual petroleum <br /> hydrocarbons adsorbed to soil and present in groundwater is occurring. <br /> 3. Ten years after the release was stopped, groundwater meets Basin Plan <br /> objectives with respect to BTEX constituents within about 70 feet of the site; with respect <br /> to TPH-g, groundwater meets Basin Plan objectives within 150 feet of the site. <br /> 4. Petitioner's site is located in a commercial/residential area. No water supply <br /> wells are located within 800 feet and the nearest surface water is about 2,000 feet from <br /> the site. <br /> 5. Current water supply wells in the vicinity of the site are constructed with <br /> sanitary seals which extend to depths of 150 to 200 feet below.ground surface for the <br /> purpose of excluding poor quality shallow groundwater. Any future supply wells which <br /> may be constructed in the vicinity of the site will in all likelihood be similarly <br /> constructed. <br /> 6. Additional soil and water reinediation at petitioner's site is not necessary. <br /> 7. The level of site cleanup is consistent with the maximum benefit to the people <br /> of the state. <br /> 8. Given the adverse technical and economic implications statewide if further <br /> corrective action was required, and the minimal.benefits, if any, that would be gained by <br /> further corrective action, it is not feasible to attain background water quality at <br /> petitioner's site. <br /> 9. Detectable concentrations of BTEX in shallow groundwater in contact with the <br /> limited residual petroleum hydrocarbons adsorbed to soil particles may remain above <br /> MCLS and thus violate the Basin Plan objectives in a very localized, small volume of <br /> surrounding groundwater for decades. <br /> 10. Detectable concentrations of TPH-g in shallow groundwater in contact with <br /> the limited residual petroleum hydrocarbons adsorbed to soil particles will likely remain <br /> above 5 ppb (the commonly accepted odor threshold for drinking water) and thus violate <br /> the Basin Plan's narrative odor objective in a very localized; small volume of surrounding <br /> groundwater for anywhere from decades to hundreds of years. . <br /> 13 <br />