ARCHIVED REPORTS_XR0005697 - Laserfiche WebLink

Home Browse Search

Mr Terry Tarditi •' May 11, 2004 Page 4 TPH-G Consistent with previous quarters, low TPH-G concentrations (120 and 110 µg/L, respectively) were detected in MW-3 TPH-G concentrations remain below the method reporting limit of 50 µg/L in MW-2 for both quarters TPH-G concentrations were below the increased method reporting limit of 100 µg/L in well MW-4 in the 3rd quarter and below the reporting lima of 50 µg/L in the 4th quarter As in the case of benzene concentrations described above for MW-1, the TPH-G reporting limit was increased to 20,000 µg/L for TPH-G in the Yd quarter and 5,000 µg/L,which makes it difficult to determine if TPH-G concentrations are present MtBE MtBE concentrations were detected in samples from each monitorm P g well in both the 3rd and 4th quarters MtBE was not detected in the Supply Well sample In MW-1, MtBE concentrations increased to a lustoric high of 75,000 µg/L in the 3rd quarter and decreased to 27,000 µg/L Low MtBE concentrations (3 10 µg/L and 100 µg/L , respectively) were detected for the first time since May 2001 in MW-2 MtBE concentrations remained relatively consistent with historical results in wells MW-3 and MW-4 except for a historical high concentration of 51 4g/L in the 3113 quarter sample from MW-3 Other Oxygenates ETBE, DIPE and TAME were not detected in samples from MW-1, MW-2, and MW-4 DIPE was detected in samples from both quarters in MW-4 Tert-Butanol was detected in the 4th quarter sample from MW-3 (110 µg/L) and iii the 4th quarter sample from MW-4 (9 9 µg/L) However, Kiff Analytical applied a "J" flag to the MW-4 detection due to the low conversion of MtBE to tent-butanol during the analysis Kiff Analytical considers flus conversion effect to be mathematically significant in samples that contain MtBE/Tert-Butanol in ratios of over 20 1 Dilutions within the MW-1 sample increased reporting limits,which makes it difficult to determine if oxygenate concentrations are present Th:r report wtmr pmparrd to accordance weth ibe standards of the errermnmenta!conrnitsng:ndu rlry a1 the lane zt wns prepared 1l rhoald not Ge relied upon by partner other than tbose for mbom if av r ptrpared and then only to the r%lenl of the scope of work wwhtch ua r axthon.-ed (hu nport does nol guarantee that no addrlronal emamnmealal contannnaleon beyond that desenbed in the i report eazsls at the rite P\21000\21417\Repor6\3rdand4rh 03gtrsdoc