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geogfo rcaf7echnus Inc Page 3 Groundwater Monitoring Report Project No 723 2 January 29,2001 The dedicated Waterra pump was used to collect each monitoring well sample A stainless steel bailer was used to sample the domestic well at 60 E Castle Avenue Extreme care was exercised while transferring the sample into 40-m1 VOA vials preserved with hydrochloric acid 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 their movement and ensure their integrity 1.3 Laboratory Analyses The groundwater samples collected on December 2000 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) Samples from each well were also sent to CLS Labs (certification #1233) from Sherwood Labs for the analysis of • Fuel Oxygenates (MTBE, DIPE, ETRE, TAME & TBA) by EPA method 8260B • 1,2 DCA and EDB by EPA method 8260B ' • Methanol and Ethanol 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 • The concentration of BTEX and TPH-G continue to fluctuate in individual monitoring wells from one monitoring event to the next • MW-101 showed low levels of BTEX and TPH-G for the fifth consecutive event Concentrations appear to be stable • Gasoline oxygenates were not detected in any well above the laboratory reporting limits �1