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S E C 0 R <br /> Ms Vick, McCartney , <br /> August 24, 2004 <br /> Page 2 <br /> from the area of well MW-5, at a hydraulic gradient ranging from 0 006 to 0 013 feet per foot (fvft) <br /> Historical groundwater gradient data are presented in Table 2 Groundwater elevations decreased <br /> by an average of 0 46 feet (ft) from the previous quarter SECOR's field procedures for groundwater <br /> sampling and equipment decontamination are Included in Attachment 1 Groundwater sampling field <br /> data sheets showing recorded depth to groundwater levels are included in Attachment 2 <br /> r <br /> Groundwater samples were submitted for analysis of total petroleum hydrocarbons as gasoline <br /> (TPHg), benzene, toluene, ethylbenzene, and total xylenes (BTEX), fuel oxygenates methyl tertiary x <br /> butyl ether (MtBE), ethyl tertiary butyl ether (EtBE), dl-Isopropyl ether (DIPE), tertiary amyl methyl <br /> ether (TAME), tertiary butyl alcohol (TBA), and ethanol, and lead scavengers 1,2 dichloroethane <br /> (1,2-DCA) and 1,2-dibromoethane (EDB) by EPA Method 8260E SECOR's procedures for <br /> groundwater sample collection are presented In Attachment 1 The certified laboratory analytical <br /> report, chain-of-custody documentation, and field data sheets are Included In Attachment 2 <br /> Ethylbenzene, DIPS, TAME, ethanol, 1,2-DCA, and EDB were not detected above laboratory method <br /> reporting limits A summary of petroleum hydrocarbons and fuel oxygenates detected In site wells Is <br /> presented below <br /> Number of Detections Minimum Maximum <br /> Constituents above the MDL of the 11 Concentration in NgIL(Well ID) Concentration in}ig/L(Well ID) <br /> Total Samples <br /> TPHg 2 370(MW-9) 400(MW-3) <br /> Benzene 2 0 51 (MW-8) 4 6(MW-3) <br /> Toluene 1 — 0 68(MW-8) <br /> Ethylbenzene 0 — - <br /> Xylenes 1 ~- 19(MW-3) <br /> MtBE 7 1 4(MW-5) 570(MW-3)�' a, <br /> EtBE 1 — 1 2(MW-6) <br /> TBA 6 93(MW-1R) 55,000(VW-1) r a <br /> Definitions Y <br /> MDL=Method Detection Limit <br /> pg/L=Micrograms per Liter <br /> The certified laboratory analytical report contained several comments associated with the analysis of <br /> the samples A discrete peak In addition to gasoline was present In the groundwater sample from <br /> well MW-3 Petroleum hydrocarbons reported In the gasoline range in groundwater samples from <br /> well MW-9 did not match the laboratory's gasoline standard In addition, the reporting limits were <br /> raised due to high levels of analytes present In samples MW-2R, MW-3, MW-9, and VW-1 In the <br /> trip blank sample (QCTB) and the sample from well MW-7, slloxane peaks were present that were <br /> unrelated to gasoline, if the results were quantified in the gasoline range, the concentrations would <br /> be reported as 51 NgIL and 50 pg/L, respectively Groundwater analytical data are Included In <br /> Tables 1 and 3, and are shown on Figure 2 <br /> s <br /> I IConocoPhilhpslTosco Market,ng1111931QMR\2QMR04 Final doc <br /> b <br />