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Environmental <br /> ' Science & <br /> _- Engineering,Inc ' <br /> January 22, 1993 <br /> Project No 6-92-5400 <br /> APR 2 8 CM <br /> ENViRQNIVtbGAL riLAL f H <br /> Cecchini, Cecchirn & Giovanni PERMIT/SERVICES <br /> c/o Mr. Ellis Cecchini <br /> 1312 A Street <br /> Antioch, California 94509 <br /> SUBJECT: December 1992 QunalrterDy Ground Wzter Mo>mntorulmg Report Troir weH UST-1 <br /> at 3535 E. Clnerokee Road, Stockgom, CaH oirmiai <br /> Dear Mr. Cecchini: <br /> Environmental Science & Engineering,g g, Inc. (ESE) presents the following results of the <br /> December 1992 quarterly ground water monitoring activities at the former Delta Truck <br /> Sales, 3535 E. Cherokee Road, Stockton, California (]Figure 1 - Site Plan). ESE initiated <br /> a quarterly monitoring program for well UST-1, located near the fuel islands, for four <br /> quarters (one year) in August 1992. Results of ground water monitoring activities of well <br /> UST-1 performed by ESE in December 1992, representing the second of four quarters, are <br /> presented in this document. <br /> L.1 <br /> SRTE BACKGROUND <br /> In 1990, ESE approximately defined the lateral and vertical extent of soil containing diesel <br /> fuel and gasoline from leaking underground tanks and product lines at the facility. Because <br /> hydrocarbons were noted deeper than 50 feet in soil, ground water monitoring well UST-1 <br /> was installed to a depth of 103 feet Detectable concentrations of petroleum hydrocarbons <br /> were found in the water from this well. <br /> Three additional wells (SI-1, SI-2, and SI-3) are located on site approximately 600 feet from <br /> the fueling area in an estimated cross gradient position (Figure 1). Since ground water <br /> samples from these wells do not contain detectable concentrations of hydrocarbons, wells <br /> SI-1, SI-2, and SI-3 are considered to be outside of the ground water plume from the fueling <br /> island. Wells SI-1, SI-2, and SI-3 were not sampled as part of this ground water monitoring <br /> program. <br /> in August 1992, an ESE representative discovered that the well box for ground water <br /> monitoring well UST-1, located near the fueling island, was damaged. In September 1992, <br /> ESE replaced the well box and purged and sampled the well as part of the quarterly ground <br /> water monitoring program. <br /> 4090 Nelson Avenue,Suite] Concord,CA 94520 Phone(510)689-405' Fax(510)685-5323 <br /> voum.aaK[uaA.m�haranrs�rxMytrNe�•o4.+rte-seye'.:.i'®FWM wd»'•`.'-..usamet rtn «w rnrawxn N..zN.x...n ,w, __ <br />