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1 <br /> C4,110gccal hChluCS InC Page 4 <br /> Groundwater Monitoring Report <br /> Pioject No 724 2 <br /> January 17,2003 <br /> ' samples were checked for headspace bubbles, labeled, inserted into foam holders and placed <br /> into an ace chest cooled to 4°C for transport to the laboratory <br /> The sampling technician while collecting all samples, wore disposable gloves <br />' A chain of custody document, listing all samples collected and their intended analyses, <br /> accompanied the samples from field to the laboratory, thereby providing a means to track <br /> their movement and ensure their integrity <br /> 13 Laboratory Analyses <br />' The groundwater samples collected on September 12, 2002, were delivered to Sherwood <br /> Labs of Hilmar, California (certification #1400) foi analyses of <br />' s Benzene, Toluene, Ethyl Benzene, and Xylene (BTEX), MTBE by EPA method 8020 <br /> • Total Petroleum Hydrocarbons as Gasoline (TPH-G) by EPA method 8015(M) <br /> The detection limits for the above analyses are listed in Table 4 of Appendix A, while the <br /> lab analytical results are presented in Appendix B <br /> As required under A132886, the laboratory data was submitted electronically to GeoTracker <br /> on October 2, 2002 - confirmation number 2930675506 <br /> 2.0 FINDINGS AND DISCUSSION <br />' The results of the groundwater sample analysis show the following <br /> • Wells MW-1, MW-5, MW-6 and MW-104 dad not detect the petroleum hydrocarbon <br />' contaminants above the laboratory reporting limits <br /> • Well MW-2 has trace amounts to low concentrations of the BTEX and TPH-G <br /> • Wells MW-3 and MW-4 contain trace concentrations of BTEX <br />' • MW-7 contained low levels of MTBE <br /> 0 Intermediate wells MW-106 and MW-107 contained trace BTEX concentrations and <br /> low TPH-G and MTBE concentrations <br /> • TPH-G was not detected in any of the water table wells (MW-4 through MW-7) <br /> S TPH-G was detected in intennedlate wells MW-2, MW-106 and MW-107 Figure 5 — <br />' Intermediate Well TPH-G Concentrations - illustrates the extent of the TPH-G plume <br /> The shallow groundwater plume is evident in well MW-4 and defined laterally to the east <br /> (down gradient) by MW-5, MW-6 and MW-7 This situation is illustrated in Figure 6 — <br /> Water Table Well Benzene Concentrations Figure 7 -- Intermediate Well Benzene <br /> Concentrations & Figure 8 — Intennediate Well MTBE Concentrations suggest that a <br />