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FOURTH (QUARTER 1993 GROUND SWAT ER MONETORI NG REPORT 3535 E. CHEROKEE ROAD, STOCK'l ON, CAILHIF®I1 M A 1.0 IIN'II`II8®I<DIJC'1I`)I®N The following report documents Fourth Quarter 1993 Ground Water Monitoring for the fueling island area of the subject site (Figure 1 - Vicinity Map) In addition, this report documents two additional tasks performed this quarter that are related to the project. 1.1 BACIKQRQUND One well, designated USB=1, is located in the fueling island (Figure 2 - Relative Ground Water Elevation- November 4, 1993) Well UST-1 had problems with leakage of fuel from the surface and was repaired twice within the last year. The latest repair was made in March 1993 when ESE placed a second cover and re-fitted the water tight seal on the well. In October 1992 ESE implemented a quarterly monitoring program that includes well UST- 1. As of July 1, 1993 the monitoring program also included water level measurements in three additional ground water monitoring wells located in the northern portion of the site. For the Tbird Quarter 1993, two onsite non-transient, non-community water supply wells were sampled in accordance p o ce wi h t a request from the Mr Ray Borges of San Joaquin County PublicHealth Department Analytical results for the two water supply wells, "big" and ' small+, reported nondetectable hydrocarbon constituents for all analytes and all drinking water constituents within regulatory thresholds for these values. The San Joaquin County Public Health Department recently sent a letter to the site owners with the new monitoring requirements for these wells. It is our understanding that the water supply well monitoring is separate from the ground water monitoring performed for the underground tank program The water supply well analysis will be reported separately to Mr Borges by Mr Robert Cecchuu. 1-\6n54W\4QTRGWM RPr 1 Environmental Science do Engmmwg,Inc