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Wm. J. Hunter & Associates -'Mr K ;FEA`-TH 2220 Loma Vista Dr. <br /> Registered Geologists_ Sacramento,CA 95825 <br /> Petroleum& Mineral Appraisers 015 APR -5 PM 1: 47 (916) 972-7941 <br /> FAX (916) 972-1683 <br /> INTERIM ASSESSMENT REPORT AND <br /> PRELIMINARY WORKPLAN FOR SOIL REMEDIATION <br /> 2969 Loomis Road, Stockton CA <br /> Site Code 2015 <br /> Prepared for <br /> San Joaquin County PHS <br /> Environmental Health Division <br /> by <br /> Wm: J. Hunter & Associates <br /> March, 1995 <br /> PURPOSE OF REPORT: <br /> On February 3, 1995, Linda Turkatte, Sr. REHS of the San Joaquin <br /> County PHS, Environmental Health Division, responded to Wm. J. <br /> Hunter & Associates Quarterly Groundwater Monitoring Report & <br /> Request for Site Closure dated January 6, 1995; she stated that <br /> since some soil contamination was measured in Monitoring well #1 , <br /> site closure could not be approved until attempts to remediate <br /> that contamination are performed. A workplan to attempt to <br /> acomplish that task was requested by April 3, 1995. Refer to <br /> EXHIBIT 9 for a copy of that correspondence. <br /> There have been thirteen ( 13) groundwater sampling events since <br /> monitoring began in April, 1992. Only MW-1 has recorded contami- <br /> nation in the water; MW-2 & MW-3 have been below detection limits <br /> since work began. There was no soil contamination encountered in <br /> either of those two wells. The results of soil sample analyzes <br /> from the three wells is included as TABLE I . <br /> Benzene was measured in MW-1 in three of the sampling events; <br /> 6/93, 9/93, .& 1/94; it was below detection limits in the three <br /> samplings done 5/94, 8/94, & 11/94 . Xylene was detected only <br /> once, in the 6/93 sampling, and neither toluene or ethylbenzene <br /> have detected in any sampling. Minor amounts of TPH-D have been <br /> measured in four samplings. Refer to TABLE II for a summary of <br /> the laboratory results of all water samples taken at the site. <br /> A ' review of the work performed to date indicates that any program <br /> designed to evaluate the movability of the petroleum constituents <br /> remaining in the soil will most likely require the placement of <br /> at least one injection well. MW-1 may be a suitable candidate <br /> for testing purposes; the top of the screened interval is at 64' , <br /> some 6' above present water levels. An injection well located at <br /> the approximate location shown on PLATE IV may be sufficient to <br /> determine. the feasibility of such a procedure. However, until <br /> RFP' s are submitted to qualified contractors, it is not possible <br /> to prepare a detailed workplan at this time. A review of prior <br /> 1 <br />