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! A "h i il 7 I,�Il✓1.� r y si I• =Its Working To Restore Nature 1710 Main Street Escalon, CA 95320 Phone (209) 838-3507 FAX (209) 838-3509 July 14, 1994 Ms Margaret Lagorio San Joaquin County Public Health Services Environmental Health Division P O Box 2009 Stockton, CA 95201 Subject Monitoring and Sampling Report, April through June 1994 Holt Bros , Site Code 1988, 1521 West Charter Way, Stockton, California Ms Lagorio This letter report will serve to document monitoring and sampling activities from April through June 1994 at the subject site (Figure 1) Groundwater monitoring and sampling was conducted on June 6, 1994 Activities included monitoring of the six groundwater wells on-site, sampling four groundwater monitoring wells for analysis of dissolved hydrocarbons and halogenated volatile organics and measuring the thickness of free product in well MW 1 GROUNDWATER MONITORING AND SAMPLING RESNA personnel performed groundwater monitoring and sampling on June 6, 1994 Field work consisted of measuring depth to water (DTW) in all wells and subjectively analyzing the water from wells MWI, MW2, MW3, MW4, MW5, and MW6 for the presence of sheen or floating product Well locations are shown on Figure 2 The depth-to-water in the wells ranged from 24 31 to 26 35 feet below the top of the well casings, an average water level rise of approximately 0 03 feet since the last monitoring event in March 1994 Groundwater monitoring data since December 1990 are summarized in Table 1 Groundwater elevation data suggests an irregular groundwater surface exists beneath the site The groundwater flow net beneath the site historically has varied considerably The irregularities in the measured depths-to-water may be due to the heterogeneous nature of the soils and/or the varying well depths A groundwater gradient map for the June 6, 1994 monitoring event is presented on Figure 2 E 500771QI DART LYI2QR 1994 F NL