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Wm. J. Hunter & Associates 2220 Loma Vista Dr. <br /> Registered Geologists Sacramento, GA 95825 <br /> Petroleum& Mineral Appraisers (916) 972-7941 <br /> FAX (916) 972-1683 <br /> t July 15 , 1994 <br /> Steven Sasson, REHS <br /> San Joaquin County PHS <br /> Environmental Health Division <br /> 445 No. San Joaquin Street <br /> Stockton, CA 95202 '9/.5 <br /> Ref : Firat Quarterly Groundwater Monitoring Report for _gk� W. <br /> Fremont Street , Stockton. <br /> Dear Mr. Sasson; <br /> We have enclosed a copy of the field report, water analysis <br /> results , and a gradient map for the above property. The work was <br /> performed by Del--Tech Geotechnical Support Services as directed <br /> by our office. <br /> The attached PLATE I shows the direction of the groundwater <br /> gradient indicated by the two ( 2 ) measurements taken to date. <br /> Both sets of data indicate a NNE direction, which is in close <br /> agreement with both the regional gradient and other monitoring <br /> well data in the area. <br /> The results of the laboratory anayzes of the two sets of water <br /> samples collected to date are shown on TABLE I . To date, neither <br /> BTEX or TPH-G have been detected in water samples from MW-1 or <br /> MW-3 . MW-2, directly downgradient from the site of the removed <br /> UST, revealed significant levels of BTEX & TPH--G in samples taken <br /> in March and June. However, the levels measured in June are an <br /> average of 50% lower than those taken in March. <br /> The water table dropped an average of . 11 ' , ( slightly over one <br /> inch, ) between March & June; there is insufficient data to date <br /> to determine whether that change is statistically significant . <br /> CONCLUSIONS: <br /> Based upon the limited data collected to date, the following <br /> conclusions appear valid: <br /> { 1 . MW-1 & MW-3 indicate that the limits of the plume have been <br /> defined to the east, south, & west of the UST site . <br /> '•� 2 . MW-2 is located in a downgradient position, and reveals that <br /> the contamination has moved northeasterly, which is the indicated <br /> direction of groundwater flow. <br /> 3 . The plume has not been fully defined to the north-northeast , <br /> but there are insufficient gradient measurements at this time to <br /> 1 <br />