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�.V <br /> Mobil Oil Corporation <br /> J u i'� 2 ���� BURenNK3800 WESTcnLIFORNInALAMEDA v91505-aa31ITE 700 <br /> June 5, 7987 <br /> ENViROVEINITAL ; <br /> Ms. Lori Cottula PE <br /> San Joaquin County <br /> Health Department MOBIL OIL CORPORATION <br /> 1601 E. Hazelton Ave. SERVICE. STATI.ON-#IO-NP4 <br /> P.O. Box 2009 92375. TRACY BLVD. <br /> Stockton, CA 95205 TRACY, CA <br /> Dear Ms. Cottula: <br /> Attached is our consultant's report on the above referenced station. <br /> After the four additional groundwater monitoring wells were installed, samples <br /> were obtained and analyzed. Laboratory analysis indicated levels of dissolved <br /> hydrocarbon and BTX concentrations in five of the eight groundwater wells. <br /> r <br /> The extent of the dissolved product plume is unknown at this point in time. <br /> Therefore, it is necessary to conduct a pump test to assess the effect of the ; <br /> water table draw down on the dissolved plume. <br /> With two other service stations in close proximity to Mobil ' s site, it is <br /> possible that there are other sources relative to the: contamination. <br /> Therefore, it is necessary to survey other wells in the area to better <br /> establish the source of contamination. In addition the existing monitoring <br /> wells will be sampled on a monthly basis for a period of three months. <br /> The additional work discussed above is required to design an effective method <br /> for site remediation at the location, if required. <br /> Mobil intends to proceed with further investigations at this site, unless <br /> notified by your office. Should you have any questions, contact Jane Keith at <br /> (818) 953-2519. <br /> a <br /> Sincerel , <br /> �t <br /> R. ;. Edwards r <br /> R69g ph Environmental Manager <br /> JMK:mhc <br /> Attachment <br /> • (91070) <br /> C.C: Mr. G. L. Boggs <br /> California Regional Water <br /> Quality Control Board <br /> 3201 "S" Street <br /> Sacramento, CA 94816 <br /> a <br />