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fill Brown and Caldwell 3480 Buskirk Avenue Pleasant Hill CA 94523-4342 P 0 Box 8045 . Walnut Creek CA 94596-1220 J1I (510)937-9010 1994 November FAX (510) 937-9026 November 10, 1994 ENVIRONMENTAL HEALTH PERMIT/SERVICES Mr. Brian Cobb EI Serve Management Company 2550 N. Loop West, Suite 600 Houston, Texas 77292 11-1565-0411 Subject: Third Quarter Groundwater Monitoring Report, Former E-Z Serve Station #100878, 1012 West Yosemite Avenue, Manteca, California Dear Mr. Cobb. Brown and Caldwell conducted the third quarter groundwater monitoring event at E-Z Serve Management Company's (E-Z Serve) Former Station #100878, 1012 West Yosemite Avenue, Manteca, California, on September 27, 1994 This sampling event signifies the first phase of work conducted by Brown and Caldwell at this site The work performed at the subject site included collecting depth-to-groundwater measurements from eight groundwater monitoring . wells, purging and sampling eight wells, and submitting the groundwater samples to SPL Inc., an analytical laboratory located in Houston, Texas and certified by the State of California Department of Toxic Substance Control for analysis of hazardous materials. Field work was performed following the procedures outlined in Attachment A Summary of Findings Depth-to-water measurements were collected using an oil-water interface probe. Free product was not identified in any of the monitoring wells, however, a slight odor was identified in Well MW-2. A minimum of three well volumes was purged from each of the monitoring wells prior to sampling, except for Well MW-3, which dried out during the purging process Samples were collected from each of the monitoring wells, transferred to the appropriate sampling vials, and submitted to SPL Inc., within 48 hours of collection, under appropriate chain of custody. SPL reported receiving the samples at a temperature of 15°Celsius This temperature is above the goal of 4° Celsius, however, it is below the temperature of the groundwater at the time of sampling. Samples were analyzed by SPL, Inc. for total petroleum hydrocarbons as gasoline, benzene, toluene, ethylbenzene, and xylene isomers, following Environmental Protection Agency Methods 8015 modified and 8020. Field data collected during the sampling event indicate groundwater elevations have decreased significantly relative to last quarter. Groundwater is flowing to the north-northwest under ani average gradient of approximately 0.002 feet per foot. Analytical results show very little` ' I i I� I I Ilii fl I � i 4 II