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a � <br /> I! 221$ Loma Vista Drive <br /> Wm. J. Hunter & Associates- a„ , �j <br /> Registered Geologists_ I Sacramento, CA 95825-0363 <br /> Petroleum &Mineral Appraisers FAX 9 <br /> FAX (9156)) 997 1 <br /> 72-1683 <br /> n.� ! s 5a . <br /> C <br /> February 14, 2000 <br /> II� <br /> Margaret Lagorio, RE-no i. <br /> San Joaquin County PHS <br /> Environmental Health Division <br /> LOP/Site Mitigation Unit IV , <br /> P.O. Box 388 <br /> Stockton, CA 95201-0388 <br /> Re: Valley Wholesale Drug Co., 1401 W. Fremont St., Stockton; Site Code 1782 <br /> Dear Margaret; <br /> We have enclosed the latestS roundwater monitoring report for the above property. The <br /> work was done on December 17, 1999 by Del-Tech Geotechnical Services. This is the <br /> eleventh sampling event at this site since placement of three monitoring wells in 1985. The <br /> results of all of the work done to date show that the plume is not migrating, and the levels are <br /> gradually decreasing. However, concentrations of BTEX & TPHg still exceed allowable <br /> limits for closure. Because groundwater'..'is less than 10 feet below ground level, soil vapor <br /> -. extraction/air sparging is suitable for remediation. In the three latest reports, we have <br /> suggested that the placement of an oxygen reducing compound in MW 1 is a cost effective <br /> method of reducing the petroleum compounds to acceptable levels. To date we have not <br /> received a response to those requests. The owners want to do whatever is necessary to <br /> obtain site closure, and are most anxious to proceed with cleanup. However, they concur <br /> with our position that without specific instructions from your office, we cannot proceed with <br /> remediation at this site. It is apparent tows that continued monitoring is unnecessary and <br /> costly, and is doing nothing to achieve closure. <br /> We realize that your staff has many projects which have a higher priority than this one. <br /> However, we request that you and your staff take time to review this project and give us <br /> specific instructions concerning how to achieve site closure. We will reduce sampling to <br /> semi-annually until further work is performed. <br /> Malley <br /> p <br /> Mark List, RWQCB <br />