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GeobgkilTecaicsAM Page 4 Groundwater Monitoring Report Project No.750.2 July 22,2003 pump into 40-m1 VOA vials preserved with hydrochloric acid or trisodium phosphate. Each sample container was checked for headspace bubbles, identified and labeled with a unique designation, inserted into foam holders and placed in a chilled ice chest for transport to the ' laboratory. All non-disposable sampling equipment was decontaminated using a steam ` cleaner before and between uses. Disposable gloves were used by the technician to collect Lall samples and were changed with each sampling event. A chain of custody document, listing all samples collected and their intended analyses, ' accompanied the samples from field to the laboratory, thereby providing a means to track the movement of and ensure the integrity of the samples. Groundwater monitoring field logs are included in Appendix C. 1.3 Laboratory Analyses The groundwater samples collected on June 5, 2003, were delivered to Sherwood Labs of Hilmar, California(Department of Health Services Certification No. 1400), for analysis. The groundwater samples were analyzed for: •` Benzene, Toluene, Ethyl Benzene, and Xylene(BTEX) by EPA method 8020/8015 • Total Petroleum Hydrocarbons as Gasoline (TPH-G) by EPA method 5030/8015(M) Additional samples were sent to Entech Analytical Labs, Inc. from Sherwood Labs for the analysis of: i • Fuel oxygenated compounds (MTBE, DIPS, ETBE, TAME & TBA) by EPA method 8260 I The detection limits for the above analyses are listed in Table 2 of Appendix A and the lab i L data are presented in Appendix B. As required under AB2886, the laboratory data was submitted electronically to GeoTracker is on June 19, 2003. The confinnation number is 4531946241. L 2.0 FINDINGS &RECOMMENDATIONS Findings 4 The results of the groundwater sample analyses show the following: • All six monitoring wells were non-detect for all analyzed compounds. MW-1 was completely non-detect for the second consecutive monitoring event. Figure 5 illustrates groundwater elevation and TPH-G concentrations in MW-1 versus time.