ARCHIVED REPORTS_XR0005692 - Laserfiche WebLink

Home Browse Search

i Mr Terry Tarditi • April 5,2005 ' Page 4 TPH-g. The only detection of TPH-g was in the sample from MW-3 at 75 µg/L All other TPH-g concentrations were detected below their respective method reporting limits MtBE. MtBE concentrations were detected in samples from all four monitoring wells In MW-1,MtBE concentrations decreased from 49,000 µg/L in the fourth 1 quarter 2004 to 25,000 µg/L this quarter Trace MtBE concentrations were detected in MW-2 at 0 53 µg/L MtBE concentrations increased slightly from the fourth quarter 2004 levels in MW-3 from 16 µg/L to 25 µg/L and decreased in ' MW-4 from 400 µg/L to 280 µg/L The laboratory report case narrative indicated that the matrix spike/matrix spike duplicate results associated with the sample from MW-3 for MtBE were affected by the MtBE concentration (25 µg/L) present in the un-spiked sample The laboratory indicated the low percent recoveries of the MS/MSD do not impact the MtBE concentrations reported Upon review of the laboratory quality control data by Brown and Caldwell's data ' validation team, the result from MW-3 may be biased low However,even with a biased result,the result doesn't affect the remedial objectives for site remediation r• Other Oxygenates. Of the other oxygenates [Disopxopyl ether (RIPE), ethyl- tertiary-butyl ether (ELBE), tert-amyl methyl ether(TAME) and tert-butanol} only concentrations of DIPE and tert-butanol were detected in MW-4 at 10 µg/L and 38 µg/L,respectively r 1 Thur eepart my prpmsd ui=rff&4na wth t&standards of t&ena moi&d c=m4ug m&utry at t&arae u uwr prepmed It rhoxld not 6e mW#w 6j pxw other A=thane for P&w it mar pnpmed aad t&n m#to t&exam of t&supe of vMA*&J ares,"rimmed T&r m,w does not p"a to that no adduroxd eo%RMfi Aenta1 Wn"%n0AW&pond that duns&d to t&s report a is at t&rue P-\27000\127960 T&T Tmckmg\Rep0rts\1St-059tr doc