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. a.ahaN y- <br /> r <br /> l <br /> w <br /> WEISS ASSOCIATES Consulting in Geology E Geohydrology <br /> 2938 Mr_Clure Slreet, Oakland, CA 94609 415-465-1100 <br /> DEC 11 <br /> September 1, 1989 TT <br /> C.. <br /> John Randall <br /> Chevron USA <br /> P.O. Box 5004 <br /> San Ramon, CA 94583-0804 <br /> Re: Chevron Service Station #r96465 <br /> North Pershing Ave. and Robinhood Dr. <br /> Stockton, California <br /> WA Job #4-305-01 i <br /> Kj <br /> Dear Mr.Randall: t—A <br /> Weiss Associates(WA)collected ground water samples from three monitoring wells on <br /> July 19, 1989 as part of the quarterly ground water monitoring program at Chevron Service <br /> Station #96465 in Stockton, California (Figures 1 and 2). Ground water samples from <br /> monitoring wells MW-2, MW-4 and MW--5 contained hydrocarbons at historically high <br /> .,,. concentrations. On June-27,1989 and July 6,1989,water in wells MW-2.MVY-4,and MW-5 was <br /> black and odorous. This watisr was purged,but no samples were taken at those times. <br /> GROUND WATER SAMPLING AND FIELD OBSERVATIONS <br /> On June 27, 1989,WA environmental technician Tim Wickens measured water levels <br /> in all seven site welts and attempted to collect ground water samples. Wells Mvv 1,MW-3,MW <br /> 6 and MW-7 were dry and therefore not sampled. Water purged from wells MW 2,MW-4 and <br /> MW-5 was black and had a sulfur-like odor;therefore,water samples were not collected. On <br /> July 6, 1989,Tim Wickens returned to the site to resample all wells. The water purged from <br /> wells MW-2,MW-4 and MW-5 remained 'black and odorous and therefore,samples were again <br /> not taken. On iuly 19,1989,Tim Wickens again attempted to sample the site wells. Between <br /> 0.5 and 16 gallons were purged from wells MW-2,MW-4 and MW-5. Since the purge water from <br /> these wells was clear, water samples were collected. The origin of the previously observed <br /> black color is undetermined, but it may be relat,-d to the high hydrocarbon concentrations <br /> found in the water samples. Monitoring wells MW-1,MW-3,MW-6 and MW-7 were not sampled <br /> because they contained insufficient water for sample collection. <br /> A Division of Awr,jfierrd As.soci,Nra loargrrrurled <br />