SITE INFORMATION AND CORRESPONDENCE

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i Wn1. J. Hunter & Associates pa�.r 2220 Lorna Vista Dr. Registered Geologists Sacramento, CA 95825 Petroleum& Mineral Appraisers , �� i �!rf� (916) 972-7941 {(JJ 20 FAX (916) 972-1683 August 17, 1993 Michael Collins, REHS San Joaquin County PHS Environmental Health Division 445 No. San Joaquin Street Stockton, CA 95202 Ref: 1876 Country Club Drive, Stockton; Site Code 1844 Dear Michael; I received a copy of your correspondence to the owners of the above site, (Sanchez, ) dated August 12, 1993, requesting a workplan for soil remediation to be submitted by October 18, 1993, as well as recommendations for additional work. The data obtained from-the installation of the three groundwater monitoring wells revealed that the highest levels of contamina- tion were found in the two wells closest to the site of the removed UST's, but in an upgradient position. The downgradient well had very minor amounts of contamination. As discussed in the report, this indicates that either the hydraulic gradient is not constant, and/or another source of contamination exists to the north and west of the site. Before any program can be proposed for remediation, additional water level measurements must .be obtained. It is agreed that the plume has not been defined, and additional investigative work may be required. However, until more data has been obtained & analyzed, it is not feasible to go through an extensive bidding & selection process at this time. Besides, I do not believe that the technology yet exists for successful remediation of clayey soils such as found beneath this site. It will take considerable time to investigate such processes, and make recommendations to my client. Therefore, we are requesting a four month extension, until February 18, 1994, for submittal of a remediation workplan for your review and comment. If we are able to proceed faster, we will of course submit such documents earlier. Si�n/� rel ' Wm. ter & Associates CC' Sanchez