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I E I GROUND ZERO ANALYSIS, INC. P M1 2: 3 7 2291 W. March Lane, Suite 127D Stockton, California 95207 Telephone: (209) 952-3481 Facsimile: (209) 952-9892 November 1, 1996 Mr. Michael Infurna San Joaquin County PHS/EHD P.O. Box 0388 Stockton, CA 95201-0388 Subject: Third Quarter 1996 Monitoring and Sampling Report Former Steve's Rentals, 275 Grant Line i'Road, Tracy, California Dear Mr. Infurna: This letter report presents the results of the third qu�:,Ufter 1996 groundwater monitoring and sampling at the subject site (Figure 1). Groundwater monitoring was conducted on October 9, :11996 on wells MWI, MW2, and MW3. The groundwater elevations across the site fell an average of 0.13 feet since the last monitoring event on June 28, 1996 (Table 1). Figure 2 depicts the groundwater flow direction and hydraulic gradient on October 9, 1996. Flow direction Ilat the site was generally to the northeast at a gradient of approximately 0.003 ft/ft. Monitoring'!data are included in Attachment A. On October 9, 1996 after purging at least three casing volumes of groundwater and the stabilization of temperature, pH, and electrical conductivity, samples were collected from each well in accordance with the site Well Sampling Protocol. Samples were analyzed by Argon Laboratories (ELAP #1873) of Ceres, California for benzene, toluene, ethylbenzene, xylenes. (BTEX), and methyl tert-butyl ether (MTBE) using EPA method 8020, and total petroleum hydrocarbons as gasoline (TPHg) using modified EPA�method 8015. J TPHg, BTEX, and MTBE were not present above laboratory method detection limits in samples collected from wells MW1, MW2, and MW3, which is consistent with historical results. Laboratory -analytical data are summarized in Table 2. Laboratory data sheets and chain of custody documentation are included in Attachment B. :1 gr*urkdze\pegUu.03513qm1996