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CGeolagkaITechdrs/a, Page 7 +-• Additional Site Characterization And V Quarter 2004 Groundwater Monitoring Project No.425.2 March 22,2004 MW-106 • BTEX constituents were detected in the 12 and 30 feet bgs samples. • TPH-G was only detected in the 12-foot bgs sample. All other sample depths were non- detect for TPH-G. +�- • MtBE was detected in the 28-foot bgs sample. Samples collected at 12 and 30 feet bgs may have MtBE below the laboratory reporting limits. • The 12-foot bgs soil sample was tested for ETBE, TAME, DIPE and TBA, in addition �. to the above mentioned constituents, and these four constituents were non-detect above laboratory reporting limits. MW-201 • All sample depths contained BTEX constituents. The constituents appear to attenuate with depth. • TPH-G was detected in the 7, 14 and 18-foot bgs samples. The remaining two samples, collected at 23 and 46 feet bgs were non-detect for TPH-G. • MtBE was detected in the 14-foot bgs sample. Samples collected at 7 and 18 feet bgs may have MtBE below the elevated reporting limits. The remaining two samples, collected at 23 and 46 feet bgs were non-detect for MtBE. • The 14-foot bgs soil sample was tested for ETBE, TAME, DIPE and TBA, in addition to the above mentioned constituents, and these four constituents were non-detect above --4 laboratory reporting limits. 1 GROUNDWATER • MW-3, MW-6, MW-7, MW-8, MW-102, MW-105, MW-107, MW-202 and all sampled domestic wells were non-detect above laboratory reporting limits for all analyzed constituents. • MW-1, MW-4, MW-101 and MW-201 showed low levels of TPH-G and BTEX constituents. �. • MW-2X showed trace concentrations of total xylenes. MW-2X was non-detect for all other analyzed constituents. • MW-2 showed the highest concentrations of TPH-G and BTEX constituents during this �• monitoring event. The levels have increased since the September 2003 monitoring event. MtBE was non-detect in MW-2. • MW-5 and MW-106 showed moderate levels of TPH-G and BTEX constituents. • MW-106 indicates the presence of MtBE (2.9 µg/L) and is the only well in which MtBE was detected. `r BIODEGRADATION INDICATORS The results of the Natural Attenuation Parameter (NAP) tests are summarized in Table 8 and field parameters are summarized in Table 4 of Appendix A. Laboratory data sheets are included in Appendix B. Only the water table wells are discussed to insure groundwater characteristics represent the same aquifer. The following table gives general characteristics of background conditions compared to conditions inside the plume.