ARCHIVED REPORTS XR0001930 (2) - Laserfiche WebLink

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Environmental Science & — _ Engineering, Inc F CILCORY COmpaly r h f yY yh n � • � August 24, 1993 Project 6-92-5400 Cecchint Cecchnni, & Glovannoni c/o Mr. Ellis Cecchini 1312 A Street Antioch, Cahforrna 94509 SUBJECT: T H[II1I8.1<D QUARTER 1993 GROUND WATER MOR11ITOIiB NG REPORT 3535 1& CHEROKEE ROAD, STOCKTON, CAILIIIFORNIA Dear Mr. Cecchnnn The following report documents Third Quarter 1993 Ground Nater Monitoring for the fueling island area of the subject site (Figure 1 - Vicinity Map). One well, designated UST 1, 1, is located in the fueling island (Figure 2 - Relative Ground Water Elevation July 28, 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. lJ In a letter dated June 1, 1993, San Joaquin County Public Health Services Environmental Health Services (PHS-ED) requested that two water supply wells and three additional ground water monitoring wells at the site be monitored quarterly (Figure 2). The water supply well monitoring is required as of July 1993 for nondomestic water supply wells under the public water supply division of PISS-ED. Monitoring of the additional ground water wells was required by PHS-ED in order to determine gradient at the site and determine if ground water had been impacted in down and cross-gradient monitoring wells. Work Performed Third ,Ouarter 193 On July 28, 1993, Environmental Science & Engineering, Inc (ESE) staff, in the presence of Mr. Michael Infirm of PHS-ED, measured water levels in wells SI-1, SI-2, SI-3 and UST- 1 and purged and sampled well UST -1. ESE first measured the static water level in the well using an electronic interface probe. Then, using a electric submersible pump, approximately 50 gallons of water were purged from the well. During the purging process, pH, temperature and conductivity were measured. The well purging was considered complete when a minimum of three well volumes were evacuated, the final field measurements of ply, temp and conditions were within 15 percent of the prior measurement and the purged water was clear. The ground water sample was then collected from well UST-I by lowering a new (precleaned) disposable polyethylene bailer in the well using new, LJ 4090 Nelson Avenue,Suite J Concord CA 94520 Phone(510)685-4053 Fax(510)685-5323