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J <br /> Mr Harlin Knoll <br /> March 5, 1999 <br /> Page 2 0£2 <br />• concentrations of 7,900 ppb, 2,900 ppb, 1,100 ppb, 7,000 ppb, and 56,000 ppb, respectively No <br /> petroleum hydrocarbon constituents were detected in wells MW4 and MW8 Figure 3 shows the estimated <br /> extent of dissolved benzene in groundwater Analytical results are summarized in Table 3 Laboratory <br /> data sheets and chain of custody documentation are included in Attachment B <br /> WELL LOCATION SURVEY <br /> Ground Zero conducted a survey of potential receptors to impacted groundwater through evaluation of <br /> nearby domestic wells Information was obtained from San Joaquin County Public Health Services, <br /> Environmental Health Division (PHS/EHD) and the California Department of Water Resources (DWR) <br /> Thirty-five wells were identified in the vicinity of the Knowles property The closest well to the subject site <br /> is located at 7817 Thornton Road, approximately 300 feet southeast of the subject site This well is in the <br /> apparent downgradtent direction of the site and appears to be a domestic/supply well The well was <br /> identified through a visual field reconnaisance of the immediate vicinity No well details were available <br /> through DWR The available information on all wells identified in the vicinity of the site is summarized in <br /> Table 4 Known well locations are plotted on Figure 4 <br /> Please contact John Lane or Greg Stahl at your convenience if you have any questions or comments <br /> regarding the site <br /> Sincerely, ��RED G�cG`o <br /> Ground Zero Analysis,Inc <br /> JOHN P <br /> o LANE <br /> N, No 6795 <br /> John P Lane 'yJ, <br /> CA Registered Geologist 6795 (C' <br /> Gp CA1-�4 <br /> SG <br /> Attachments <br /> cc Mr Carl Knowles <br /> Mr Patrick D Riddle, Esq <br /> Ms Patricia Anderson, CRWQCB Sacramento <br /> /knowles ba n/repofts/4qn1998 doc <br />