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Wm. J. Hunter & Associates 2220 Loma Vista Dr Registered Geologists Sacramento, CA 95825 Petroleum & Mineral Appraisers (916) 972-7941 FAX (916) 972-1683 December 28 , 1995 Joel M Weiss, Engineering Geologist CRWQCB, Central Valley Region 3443 Routier Road, Suite A Sacramento, CA 95827-3098 Ref Fourth quarter 1995, Groundwater Monitoring Report for Independent Trucking facility, 1145 West Charter Way, Stockton, CA Dear Mr Weiss; We have enclosed a copy of the field report, water analysis results, gradient map, and maps showing approximate lines of equal concentrations of benzene, toluene, ethylbenzene, xylene, S TPHg, & TEPH based on the latest sampling event The field work was performed on December 6, 1995 by Del-Tech Geotechnical Support Services as directed by our office We have included the monitoring well recently placed by Nomellini Construction Co at the east side of the site We are referring to it as MW-5 in our • reports The work was scheduled to be done in October, but was delayed due to equipment problems (Del-Tech, ) and approval from adjacent owner to include their well in our program The attached PLATE I shows the potentiometrzc surface based upon the latest data It is to the north at approximately 751 /1001 , at an average depth of -17 95 msl datum The gradient has shifted about 90-degrees since the July, 1995 sampling, which indicated a gradient to the east However, the Nomellani well was not included in our July sampling, therefore a comparison z � between the two sets of data may not be valid The water tablb" had risen an average of 055 feet between the two sampling - events The results of the laboratory analyses of water samples collected-; i from the wells are summarized on TABLE I ; laboratory worksheet-9 are included in the report A comparison between the results 79f the July & December analyses is summarized below for your infero- ° ' matron: 4�, - MW-1 Xylene & TPHg, which were present in the water sample taken in July were below detection levels in December Toluene was the only constituent detected in the December sampling, it increased from 4 0 ug/L to 6 0 ug/L MW-2 Toluene & Xylene were the only compounds detected in July, they were below detection limits in December However, TEPH as 1