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GEQMATRIX <br /> • The residual PHC remaining at the site are mostly adsorbed to the middle fine- <br /> grained layer, and potential rrugration (after 15 years) is unlikely based on current <br /> site conditions <br />' Site conditions conform to a low-risk groundwater case Based on these data, we recommend <br /> that monitored natural attenuation be the remedial action for the site We propose that <br />' groundwater sampling be conducted on a semiannual basis to monitor for potential changes in <br /> site conditions Depth-to-water measurements and groundwater samples are proposed to be <br /> collected from monitoring wells MW3-2, MW3-4, MW3-5, and MW3-6 for laboratory <br /> analyses of TPHg using U S EPA Method 8015 and BTEX using U S EPA Method 8021 <br /> Since wells MW3-1 and MW3-3 are located within 30 feet of MW3-2 and the historical TPHg <br /> and BTEX concentrations in these two wells have been similar to or lower than those of <br /> MW3-2, we recommend that MW3-1 and MW3-3 be decommissioned in accordance with the <br /> State of California and San Joaquin County requirements <br /> 1 <br /> 1'10 <br /> I 1PBOJEL'TWWs16437 00016437-08 doc 16 <br />