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1 <br /> Mr Terry Tarditi <br /> February 3, 2005 <br />' Page 4 <br />' for all the other wells BTEX concentrations were below their respective <br /> reporting limits in all of the wells These results are consistent with previous <br />' quarters Per the PHS/EHD's request, BC has worked with the analytical <br /> laboratory to deterrnme when it is feasible to quantify the BTEX constituents <br /> without damaging the equipment, especially in samples from MW-1 <br /> TPH-g The only detection of TPH-g was in the sample from MW-3 at 57 µg/L <br /> All other TPH-g concentrations were detected below their respective method <br />' reporting limits <br /> MtBE. MtBE concentrations were detected in samples from all four monitoring <br />' wells In MW-1, MtBE concentrations decreased from 55,000 µg/L in the third <br /> quarter 2004 to 49,000 µg/L this quarter Very low MtBE concentrations were <br /> detected in MW-2 at 0 9 µg/L MtBE concentrations remained similar to the <br />' third quarter 2004 levels in MW-3 from 17 n/L to 16 µg/L and decreased slightly <br /> in MW-4 from 480 µg/L to 400 µg/L <br /> Figure 7 shows MtBE concentrations vs water level elevations in MW-1 indicating <br /> the overall decline in water level elevations and the increase in MtBE <br /> concentrations However, the graph indicates there is little,if any, correlation <br /> between water level elevations and MtBE concentrations Figure 8 shows MtBE <br /> concentrations in wells MW-2, MW-3 and MW-4 and a slight increase trend in <br />' MW-4 <br /> Other Oxygenates. Dusopropyl ether (RIPE), ethyl-tertiary-butyl ether (EtBE), <br /> tert-amyl methyl ether (TAME) and tert-butanol were not detected in the samples <br /> from MW-2 and MW-3 Concentrations of DIPE were detected in samples from <br /> MW-1 and MW-4 at 32 µg/L and 12 µg/L, respectively Concentrations of EtBE, <br /> TAME and Tert-Butanol above the reporting limit were not detected in any of the <br /> samples <br /> 1 <br /> 1 <br /> Us rrport nnspreparrd en=&ziann cwth The standards of the envrronmenid conssrkrng industry at the hme it nsas proarrd it Should not be <br /> retied upon by parties other than those for whom it insprrpareg and then only to the extent of the scope gfanrla whish alit autbonnrd This <br /> rrport does notguamntee that no addsaonalenwronmentaltontamrnatson beyond 46at descnbedm this apart exists at the site <br />' P\21000\21417-T&T\Reports\4th-04gtr doc <br />