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r <br /> Wm. J. Hunter & Associates �;�"� '�.1;r� lir-2 i_amaVista Dr. <br /> 'lMegistered Geologists r t�a ionto. CA 95825 <br /> etroleum& Mineral Appraisers � - �' (916)972-7941 <br /> . pj f j' X (9i 8)972-1683 <br /> November 13, 1993 <br /> Michael Collins, REHS <br /> San Joaquin County PHS <br /> Environmental Health Division <br /> 445 No. San Joaquin Street <br /> Stockton, CA 95202 <br /> Ref= Second Quarterly Groundwater Monitoring Report, 1876 CounLry <br /> Club Drive, Stockton; Site Code 1844 <br /> Dear Michael; <br /> We are enclosing the results of the third groundwater measure- <br /> ments, sampling & laboratory results done on November 1, 1993, <br /> covering the above property. Included are copies of the field <br /> logs made by Del-Tech, laboratory, results, and a site map <br /> summarizing the lab data & hydraulic gradient. The requested <br /> analysis for EPA 502. 1 was not done because the laboratory was <br /> unable to perform that test. Ile will utilize to different testing <br /> facility when the wells are sampled the next time to make sure <br /> that analysis can be done. <br /> The results of the work done to date is summarized below: <br /> 1. The water table has dropped almost one (1) foot since the <br /> measurements taken in July, and is lower than the intial readings <br /> taken in April of this year. <br /> 2. The hydraulic gradient, which was essentially due east when <br /> measured in July, has shifted about 60 degrees to the northeast. <br /> 3. The levels of contamination measured in the water samples <br /> varied considerably from those taken in July; refer to R <br /> for a summary of all water analysis taken to date. The <br /> differences are briefly summarized below: <br /> MW-1 Levels of benzene & TPHG are higher; others are lower. <br /> MW-2 TPHG is slightly higher, BTEX all lower. <br /> MW--3 Benzene is higher, rest are all lower. <br /> COMMNTS: <br /> 1. The water levels measured in all three wells are below those <br /> initially recorded in April, but the amount of benzene has <br /> increased in both MW-1 & MW-3. The DST' s had not been in service <br /> for over 15 years, & were removed from the site in January, 1989; <br /> for those reasons the increasing levels of benzene encountered <br /> 1 <br />