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. 6 0 RECOMMENDATIONS <br /> 6.1 Soil Impacts <br /> MARK recommends the site receive closure with respect to soil conditions Petroleum- <br /> unpacted soil has either been excavated and remediaed or effectively treated in-place through <br /> vapor extraction/injection techniques Further soil investigation or remediation is neither <br /> warranted nor recommended. <br /> 6.2 Groundwater Impacts <br /> Petroleum hydrocarbons detected in the groundwater appear to be limited to the area <br /> around monitonng well MW-2 and contained to the SSA site. MARK is commencing start-up <br /> of a groundwater treatment system to remove residual hydrocarbons from the groundwater to <br /> accordance with the MARK groundwater Remediation Work Plan (July 21, 1993). The San <br /> • Joaquin Public Health Services, Environmental Health Division will be updated regularly <br /> regarding treatment progress <br /> MARK recommends continued groundwater monitoring of wells MW-1, MW-2, MW-3, <br /> and MW-4 durmg the course of groundwater treatment Monitoring should be conducted on <br /> a quarterly basis for the following analyses. <br /> ■ TPH-d by EPA Method 8015M, <br /> ■ TPH-g by EPA Method 8015, and <br /> a BTEX by EPA Method 8020 <br /> The necessity for continued groundwater monitoring should be re-evaluated annually as the <br /> groundwater treatment proceeds <br /> FASCLOSE 6 6-1 92-1177102 36 <br />