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C7e069 cat 7"eclucics lac. r Page 8 <br /> Sintry <br /> nclair&Thompson Property <br /> Sas Survey Report <br /> L 29,2007 �I <br /> A DHS ELAP certified mobile lab mobilized to the Property and performed soil gas analysis <br /> for BTEX, MtBE, 1,2-DCA and EDB by using a GC/MS by method 8260B. <br /> ` • The leak-check compound(1,1-DFA) with a detection limit of 10 [.g/L was used. <br /> •. A probe blank was analyzed for the leak compourid and chemicals of concern. <br /> * :• A duplicate sample was run on SG-1. <br /> `3.2.5 Soil Gas Survey Results ! <br /> • All six (6) soil gas" samples and the,probe blank were non-detect above laboratory <br /> reporting limits for the leak check compound, MtBE, 1,2-DCA and,EDB. <br /> • SG=1 (and duplicate SG-1) soil gas. samples showed :the presence of all BTEX <br /> constituents as well as TPH. <br /> • SG-1 (and duplicate SG-1) were the only soil gas samples to show the presence of <br /> benzene. <br /> • Five (5) of the soil gas samples (SG-2 thru SG-6) and the probe blank-were non-detect for <br /> benzene and TPH. <br /> • Laboratory Data Sheets are included as Appendix B. <br /> 4n:Summary: <br /> • SG-1 Original: benzene 0.41 4g/L, ethylbenzene 0:42 g.g/L, toluene 0.37 µg/L, total <br /> xylenes 0.65 [.g/L, TPH 2,800 �tg/L <br /> • SG-1 Duplicate: benzene 0.43 µg/L, ethylbenzene 0.11 [,g/L, toluene 0.38 µg/L,Aotal <br /> * xylenes 0.61 µg/L, TPH 2,600 [.g/L <br /> • . SG-2: toluene 0.41 �tg/L, total xylenes 0.67.1 g/L <br /> • SG-3: toluene 0.37 [tg/]L,total xylenes 0.58 [,g/L <br /> • SGA (highest levels): ethylbenzene 0.11 µg/L, toluene -0.43 µg/L, total xylenes 0.66 <br /> t <br /> • SG-5: toluene 0.29 [tg/L., total xylenes 0.51 µg/L <br /> • SG-6: toluene 0.22 µg/L, total xylenes 0.39 [tg/]L <br /> 4.0 RISK EVALUATION <br /> This section will compare the analytical results measured in the field with the Tier I Lookup <br /> Tables published in the CRWQCB-SFs: Screening for Environmental Concerns at Sites with <br /> Contaminated Soil and Groundwater, dated February 2005. <br /> The Environmental Screening Levels (ESLs) use the units of I,tg/m3 and the laboratory results <br /> are recorded in units of gg/L. In order to compare the results of the field data with the ESLs <br /> in,section 4.1 below, the field data were converted to [.g/m3 (analytical results multiplied by <br /> 1,000-L/m3). 1 <br /> 'I <br />