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Mr.Kenneth Earnest <br /> Ultramar Inc. <br /> February 18, 1992 <br /> Page 2 <br /> Ground water samples collected from monitoring wells MW-20, MW-34, MW-35, and MW-36 on <br /> December 30, 1991,were submitted to a Cal iforma-certified laboratory to determine the concentration <br /> of benzene, toluene, ethylbenzene, and xylgnes (BTEX) and total petroleum hydrocarbons (TPH) as <br /> gasoline A summary of these analytical results, and the analytical results from previous sampling <br /> events is presented in Table 2 Copies of the field sampling information sheets are presented in <br /> Enclosure B, and copies of the December 30, 1991, ground water sample laboratory reports are <br /> presented in Enclosure C <br /> Analytical results indicate that benzene was not detected in the ground water samples collected on <br /> December 30, 1991. Concentrations of TPH as gasoline have decreased in ground water samples <br /> collected from monitoring wells MW-20 and MW-34, and was not detected in well MW-35 for the <br /> first tune. TPH as gasoline has not been detected in monitoring well MW-36 since it was installed <br /> in February 1991 <br /> At the request of San Joaquin County Public Health Services, a ground water sample was collected <br /> from an on-site domestic water supply well on December 30, 1991 The sample was analyzed for <br /> concentrations of BTEX, TPH as gasoline, and fecal coliform Analytical results indicate this sample <br /> did not contain detectable concentrations of BTEX,TPH as gasoline, or fecal coliform This sample <br /> was originally referred to as "Municipal Well No V on the chain-0f-custody form and laboratory <br /> reports, which are included in Enclosure C, and has been revised accordingly <br /> The next quarterly ground water monitoring and sampling event at this site is scheduled for <br /> March 1992 It is suggested that copies of this report be forwarded to the following regulatory <br /> agencies <br /> Mr Harlan Knoll Mr James B Maughan <br /> Public Health Services California Regional Water Quality Control Board <br /> County of San Joaquin Central Valley Region <br /> 1601 East Hazelton Avenue 3443 Routier Road <br /> Stockton, California 95201 Sacramento, California 95827-3098 <br /> Sincerely, <br /> DELTA ENVIRONMENTAL CONSULTANTS, INC. <br /> Richard E Chandler ,�� D G�0 <br /> Hydrogeologist �5 �O <br /> s $� <br /> Martin S Burck, R G No 5216 <br /> California Registered Geologist No 5216 <br /> REC MSB (LRP100 HMB) f ��q��•�Q <br /> Enclosures M <br />