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i <br /> Wm. J. Hunter & Associates X220 Loma vista Dr <br /> Registered Petroleum 8. Mi egal Appraisers ' ,)ists `��� r , CA 95825 <br /> 9 ) 972-7941 <br /> ny4?F! (916) 972-1683 <br /> June 30 , 1997 <br /> Michael Infurna, Sr REHS <br /> San Joaquin County PHS <br /> Environmental Health Division <br /> P O. Box 388 <br /> Stockton, CA 95201.-0388 <br /> Ref FIRST QUARTER, 1997, GROUNDWATER MONITORING REPORT, 1876 <br /> Country Club Drive, Stockton, Site Code 1844 <br /> Dear Mr Infurna, <br /> We are enclosing the results of the thirteenth groundwater <br /> measurements, sampling & laboratory results done on May 1, 1997, <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, and a site map showing the pieziometric <br /> surface based on the 5/1/97 data with all of the hydraulic <br /> gradients measured to date We have also prepared maps showing <br /> lines of equal concentrations of benzene, ethylbenzene, toluene, <br /> . xylene & TPHg based on the most recent data <br /> The water table was located at an average depth of 12 . 50 ' bgl, <br /> (- 8 . 35 ' msl , ) a rise of 3 67 ' since the December sampling The <br /> lowest average depth was 22 20 ' bgl in January, 1994 ; the highest <br /> was the May, 1997 event This is a maximum fluctuation of water <br /> depth of 9 . 71 . Due this rather significant change, the water <br /> table is now above the screened intervals in the monitoring <br /> wells <br /> The potentiometric gradient is very flat - to the north at about <br /> . 002 ' /ft . or 10 56 ' /mile Data obtained from the December, 1996 <br /> sampling indicated that the water table had created a depression <br /> in the area between monitoring wells #1 , #2 , & #3 ; (see that <br /> report for more details ) That pattern had not been seen before, <br /> and is not indicated by the latest data <br /> A summary of all laboratory results of water samples taken since <br /> monitoring began is shown on TABLE I Laboratory reports & QA/QC <br /> results are included in the back of the report MW-1 continues <br /> to show the highest levels of contamination, although the levels <br /> have decreased significantly since the December sampling A <br /> summary of results from the last two events is summarized here <br /> for your information <br /> 1 <br />