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Wm. J. Hunter & Associates 2220 Loma Vista Dr <br /> Registered Geologists Sacramento, CA 95825 <br /> �etroleum& Mineral Appraisers (916) 972-7941 <br /> FAX (916) 972-1683 <br /> May 25, 1995 <br /> MAY 3 1 1995 <br /> Michael Infurna, Sr REHS <br /> San Joaquin County PHS ENVIRONMENTAL HEALTH <br /> Environmental Health Division PERMIT/SERVICES <br /> 445 No San Joaquin Street <br /> Stockton, CA 95202 <br /> Ref , SEVENTH QUARTERLY GROUNDWATER MONITORING REPORT, 1876 <br /> Country Club Drive, Stockton, Site Code 1844 <br /> Dear Mr Infurna, <br /> We are enclosing the results of the eighth groundwater measure- 1— Q m <br /> ments, sampling & laboratory results done on March 23, 1995, /995 <br /> covering the above property Included are copies of the field <br /> logs made by Del-Tech, a table summarizing sampling results, <br /> laboratory reports, a site map showing the pieziometric surface <br /> based on the 3/23/1995 data, including directions of all of the <br /> hydraulic gradients measured to date We have also included two <br /> plates showing lines of equal concentrations of benzene & TPH-G <br /> based on the most recent data <br /> A review of the most recent work is discussed below <br /> 1 . The water table was measured at an average depth of 19 99 ' <br /> bgl, (--15 . 83 ' msl, ) a rise of 2 28 ' (average, ) since the December <br /> sampling event This is the highest depth to water since <br /> monitoring began in April, 1993 . <br /> 2 The hydraulic gradient has shifted to the southwes the <br /> slope has flattened slightly to about 15 ' /100 ' TE I shows <br /> the contours on top of the water table based upon the 3/23/1995 <br /> data <br /> 3 A summary of all laboratory results of water samples taken <br /> since monitoring began is shown on TABLE I That data shows MW-1 <br /> continues to have the highest levels of BTEX & TPH-G, MW-3 has <br /> the second highest, and MW-2 the lowest This ratio has remained <br /> consistent since monitoring began MW-4 & MW-5 have not shown <br /> any contamination since they were installed in September, 1994 <br /> 4 PLATE II shows lines of equal concentration of benzene based <br /> on the latest test results . As in previous reports, at continues <br /> to show that the highest level is in MW-1, with MW-2 second <br /> highest, and MW-3 third. MW-4 & MW-5 have not recorded any <br /> • 1 <br />