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GROUND ZERO ANALYSIS, INC. N Q V 1 9 2003 1714 Maul Street EN MENT HEALTH Escalon,California 95320-1927 PERMIT/SERVICES Telephone (209)838-9888 Facsmwe (209)838-9883 0' November 11,2003 Ms Vicki McCartney San Joaquin County Environmental Health Department 304 East Weber Avenue, Third Floor Stockton, CA 95202 Subject Third Quarter 2003 Groundwater Monitoring and Sampling Report Souza II, LLC, 612 West l la' Street, Tracy, California Site Code 0001283 Dear Ms McCartney I This letter report presents the results of the third quarter 2003 groundwater monitoring and sampling j activities at the subject site(Figure 1) Activities included monitoring depth to water in wells MW1 through MW3, purging and sampling wells MW1 through MW3, and analyzing the samples for gasoline constituents including oxygenated additives i I FIELD WORK Groundwater Monitoring An experienced Ground Zero technician measured the depth to groundwater in each site well on October 1, 2003 The depth to groundwater ranged from 12 26 to 12 77 feet below the tops of the well casings (btoc) The potentiometric surface fell an average of 0 69 feet between June 24, 2003 and October 1, 2003 Groundwater flowed to the north at a calculated gradien�of 0 0047 feet per foot, or approximately 25 feet per mile A potentiometric surface map for October.3,-2003 is presented on Figure 2 Groundwater monitoring data are summarized in Table I Field notes are included in Attachment A 0%910 Groundwater Sampling An experienced Ground Zero technician purged and sampled the site wells on October 1, 2003 The wells were purged of at least three well casing volumes of water using a centrifugal pump prior to sampling The field technician measured the physical parameters of temperature, pH, and electrical conductivity during the purging process Purged groundwater was contained in appropriately labeled DOT-approved 55-gallon • drums, which are stored onsite pending disposal G 1GROUNDZE1SouzalReportsl3QMR 2003 doc