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2 y EleV Iy��y/ V11br1�iy f e� ire Nature 1710 Main Street %J P� : 4 2 Escalon, CA 95320 ED Phone (209) 838-3507 FAX (209) 838-3509 C(DFIY November 10, 1993 Mr Reggie Mersaroh Transportation Director Tracy Public Schools 315 East Eleventh Street Tracy, California 95376 Subject: Groundwater Monitoring and Sampling Results Tracy Public School Bus Facility 315 East Eleventh Street, Tracy, California Dear Mr Mersaroh This letter is being submitted by RESNA Industries Inc (RESNA) to summarize the third quarter 1993 groundwater monitoring and sampling activities performed in October 1993 at the above referenced site. On October 11, 1993, RESNA personnel monitored groundwater depths and collected groundwater samples from each monitoring well on site, T-1, T-2, and T-3. Water level measurements were collected from each monitoring well using a Solinst Water Level Meter (Model 101) The depth to groundwater beneath the site ranged from 8 48 to 8 88 feet below grade, an average decrease of 0 63 feet since June 1993. A groundwater gradient map was created using data collected on October 11, 1993 (Figure 1). According to this information, the gradient flows to the northwest at 0.0029 feet/foot or approximately 15 feet/mile. A summary of monitoring data is included in Table 1 Prior to sampling a minimum of 26 gallons of water was purged from each well Field purge logs are included as Attachment 1 The samples were collected using dedicated, disposable bailers. The samples were submitted to state-certified Sequoia Analytical Laboratory in Redwood City, California, and analyzed for benzene, toluene, ethylbenzene, xylenes (BTEX) and total petroleum hydrocarbons as gasoline (TPHg) using EPA methods 8020 and modified 8015, respectively All purged water was contained in DOT approved drums and left on site pending laboratory analyses Laboratory analyses indicate that no detectable concentrations of 3(2R-1993 FNL