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Geologx_dTechnics Inc Page 4 ' Groundwater Monitoring Report Project No 425 2 August 12, 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 wore disposable gloves while collecting all samples 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 1 their movement and insure their integrity 10L3 Laboratory Analyses The groundwater samples collected on April 29, 1999 were delivered to BSK Labs (Department of Health Services Certification No 1180), of Fresno, California, for analysis ' The samples were analyzed using the following methods ' e EPA method 602 - BTEX e EPA method 503018015(m) - TPH-Gasoline The detection limits for the above analyses are listed in Table 4 of Appendix A and the lab data is presented in Appendix B ' 2.0 FINDINGS AND DISCUSSION ' The laboratory analytical data from this monitoring event shows that TPH-G & BTEX compounds have been detected in the following monitoring wells MW-1, MW-2, MW-4, ' MW-5, MW-102 & MW-202 The results from the latest round of sampling are comparable with the results from the ' previous monitoring events The following observations are made • 0 Concentrations in MW-1 are similar to the Nov 1998 event See Figure 3 for graph of Benzene and TPH-G versus time in MW-1