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Mr Kenneth Earnest <br /> Ultramar Inc <br /> November 30, 1992 <br /> (ie Page 2 <br /> A summary of these analytical results, and the analytical results from previous sampling events <br /> performed since February 1991, are presented in Table 2 Copies of the field sampling information <br /> sheets are presented in Enclosure B, and copies of the September 1992 ground water sample <br /> laboratory reports are presented in Enclosure C <br /> Discussion <br /> Laboratory chemical analyses results indicate that since the previous sampling event in June 1992, <br /> benzene concentrations have increased in the ground water samples collected from monitoring wells <br /> MW-34 (below detection limits to 2 3 parts per billion (ppb)) and MW-36 (below detection limits to <br /> 0 93 ppb) Concentrations of benzene in the ground water samples collected from monitoring wells <br /> MW-20 and MW-35 remained below the analytical method detection limit (<0 5 ppb) Petroleum <br /> hydrocarbons were not detected in the ground water sample collected from monitoring well MW-20 <br /> Remarks <br /> The interpretations contained in this report represent our professional opinions,and are based in part, <br /> on information supplied by the client These opinions are based on currently available information <br /> and are arrived at in accordance with currently accepted hydrogeologic and engineering practices at <br /> this time and location Other than this, no warranty is implied or intended. <br /> The next quarterly ground water monitoring and sampling event at this site is scheduled for <br /> December 1992 It is suggested that copies of this report be forwarded to the following regulatory <br /> agencies <br /> Mr Harlin 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 <br /> Hydrogeologist EVIED G�cO� <br /> 5 R BR0 O <br /> t- T 04 <br /> ?James R Brownell No 5078 <br /> alifornia Registered Geologist No 5078 rol30f4 <br /> REC (LRP104 TA) <br /> Enclosures F CAL%�- <br />