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�R GROUND ZERO ANALYSIS, INC. treet Escalon, California 95320-1927 Telephone (209)838-9888 Facsimile (209)838-9883 J U L 1 9 2001 EN'V11"-'hJ'V1ENT HEALTH PERNitT/SERVICES July 18, 2001 Mr Jeffrey Wong San Joaquin County Public Health Services Environmental Health division 304 East Weber Avenue, Third Floor Stockton, CA 95202 Subject Groundwater Monitoring and Sampling Report, April through June 2001 Speedy Mart, 8200 N Highway 99, Morada, CA Dear Mr Wong This letter report presents the results of the second quarter 2001 groundwater monitoring and sampling activities at the subject site (Figure 1) SITE ACTIVITIES Activities at the site included monitoring groundwater levels in site monitonng wells, and purging and sampling groundwater from site wells Samples were analyzed for total petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, ethylbenzene, total xylenes (BTEX), oxygenated gasoline additives, 1,2-dichloroethane (1,2-DCA), and ethylene dlbromlde (EDB) FIELD WORK Groundwater Monitoring and Sampling An experienced Ground Zero technician monitored water levels and sampled site monitoring wells MW 1 through MW9(B) on May 17 and 18, 2001 Groundwater elevations were calculated by measuring the depth to groundwater in each well and subtracting the measured depth from the respective well head elevation The depth to groundwater in site wells ranged from 58 69 feet below the well casing in MW 1 to 59 45 feet in well MW5 Groundwater elevations in shallow monitoring wells fell an average of 0 29 feet between February 2001 and May 2001 The groundwater elevation 1n well MW9(B), which was completed in a deeper aquifer, fell 0 64 feet during the same period �1 A potentlometric surtace map generated using the May 17, 2001 monitoring data is presented on Figure 2 The map indicates an apparent groundwater depression exists near well MW4, which 6\I)t1NWA M ZDIi11 F1A1JRCrlkupot1s%QNIK`2QN1211111 dnu