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Mr Terry Tarditi <br /> April 7, 2003 <br /> Page 3 <br /> Analytical constituents for each well from the 1 st quarter is shown on Figure 3, <br /> and a MTBE isoconcentration map is shown on Figure 4 <br /> BTEX. BTEZ concentrations remained consistent with the previous quarters in <br /> all four monitoring wells The reporting limits for all constituent concentrations in <br /> MW-1 were increased due to known high concentrations of MTBE in the sample <br /> The dilutions were necessary because the MTBE concentrations were out of the <br /> calibration range for the target analyte Samples from MW-1 are analyzed multiple <br /> tunes by the analytical laboratory to bring the correct dilution into the calibration <br /> range <br /> TPH-G. TPH-G concentrations are below the method reporting limit of 50 µg/L <br /> in MW-2 and are just above the reporting hrnit in MW-4 at 51 µg/L As in the <br /> case of benzene concentrations described above for MW-1, the TPH-G reporting <br /> limit was increased to 2,000 n/L for TPH-G,which makes it difficult to <br /> determine if TPH-G concentrations are present TPH-G concentrations in MW-3 <br /> remain similar to 4th quarter 2002 concentrations <br /> MTBE. In MW-1, MTBE concentrations decreased from 52,000 n/L to 44,000 <br /> µg/L MTBE was not detected in MW-2, remained consistent with historical <br /> results in MW-3, and increased from 380 µg/L to 500 µg/L in MW-4 <br /> The following documents are enclosed with thus letter <br /> Table 1 Historical Groundwater Elevation Data <br /> Table 2 Groundwater Flow Direction and Gradient <br /> Table 3 Historical Groundwater Analytical Data <br /> Figure 1 Site Map <br /> Figure 2 Groundwater Elevation Contour Map, February 10, 2003 <br /> Figure 3 Groundwater Constituent and Isoconcentration Map, <br /> February 10,2003 <br /> Figure 4 MTBE Isoconcentration Map, <br /> February 10,2003 <br /> Attachment A Field Data Sheets <br /> Attachment B Laboratory Analytical Reports <br /> !ixr rt vty wspnparrd rn aavrdamr malls tux standards of tlx enrrronmenlal ronsxltrng tnduug at It"lrmr it wuprtparrd It Amid not be <br /> robed upon 1, partre r otter than ibosr for wham it m+v r prrparrd,and lixn only to do tvlen1 of the rr47/x of a ark mdsrrh um aulhorrtird Thr r <br /> report doer not pmaranke Ilwt no additional enryrvnmensal eonlamrnalron beyond tbal de rrrrbed rn Ibrr rrpor7 emstr at the srle <br /> 1'\21111117\21417\R"r"\1st-(M$gtr doc <br />