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' geologaaI recluucs Inc Page 5 Groundwater Monytonng Report Project No 425 2 May 10,2005 ' The lab results for the above analysis are summarized in Tables 8-A for Zone A, 8-B for Zone B, 8-C for Zone C & D and 8-D for domestic wells of Appendix A, and the laboratory ' data are presented in Appendix B As required under AB2886, the laboratory data, geo well data were submitted electronically to GeoTracker on May 10, 2005 - confirmation numbers are 6224724829 and 7873936295 2.0 RESULTS OF INVESTIGATIONS Table 8-A through 8-D of Appendix A is a summary of analytical groundwater data Groundwater analytical results and field observations are discussed below Zone A: • TPH-g has not been detected in MW-1 above laboratory detection linuts. Figure 7 shows the TPH-g and Benzene variations historically • Figure 8 indicates the variation of TPH-g and Benzene concentrations historically in ' MW-2 • ly above the laboratory detection limits MW-3 has been non-detect historical • MW-4 shows almost linear level of TPH-g concentrations M • TPH-g concentrations kept varying {between 140 [,tglL and 4920 µg/L) since May 1997 in MW-5 • rty on Durham Ferry Road has been MW-6 and MW-7 on the opposite side of prope ' non-detect for the tested gasoline constituents However, DCE was detected in January, and April 2005 monitoring events in trace concentrations • MW-8 was non-detect for most of the sampling events However, since the second ' quarter 2004, MW-8 has been detected for gasoline constituents in small concentrations ' Zone B: • MW-2X and MW-101 were found non-detect for tested gasoline constituents ' • MTBE & 1,2-DCE have been detected in MW-106 However, BTEX & TPH-g remained non-detect above the laboratory detection limits ' Zone C & Zone D: • MW-102, MW-107, MW-201 and MW-202 remained non-detect for the tested gasoline constituents above the laboratory detection limits Therefore, Zone C & ' Zone D did not show any contamination