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' Geo1*afTechnus Inc Page 3 Groundwater Monitoring Report ' Project No 724 2 • December 21, 1999 ' A stainless steel bailer was used to collect each sample Bailer cleanliness was assured by collecting a bailer blank (pouring distilled water through the bailer and collecting it in a VOA ' vial) prior to collecting the analytical sample Extreme care was exercised while collecting samples to prevent agitation of the water ' contained in the bailer Water samples were transferred from the bailer into 40-m1 VOA vials preserved with hydrochloric acid using a bottom-emptying device that minimizes sample aeration during transfer of the sample All samples were checked for headspace bubbles, ' labeled, inserted into foam holders and placed in an ice chest cooled to 4°C for transport to the laboratory The sampling technician while collecting all samples wore disposable gloves 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 their movement and insure their integrity ' 1.3 Laboratory Analyses The groundwater samples collected on November 16, 1999 were delivered to Sherwood Labs of Hilmar, California(certification#1400) for analysis of • Benzene, Toluene, Ethyl Benzene, and Xylene (BTEX) by method EPA method 602 ' • Total Petroleum Hydrocarbons as Gasoline (TPH-G) by EPA method 5030/8015(M) • The oxygenated fuel compounds (MTBE, ETBE, DIPE, TAME and TBA) by EPA method 8260 The detection limits for the above analyses are listed in Table 2 of Appendix A while the lab analytical results are presented in Appendix B ' 2.0 FINDINGS AND DISCUSSION The results of the groundwater sample analysis show the following ' • Low levels of Xylene and TPH-G were detected in MW-1 • Moderate to high levels of BTEX and TPH-G compounds are present in MW-2 • Low levels of Benzene and TPH-G were detected in MW-3 ' • BTEX and TPH-G concentrations increased significantly in MW-2 but remained relatively consistent with past events in the other five wells • Low levels of Benzene and TPH-G were detected in MW-4 • Low levels of Benzene, Ethyl Benzene and Xylene were detected in MW-5 1