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r M <br /> 1 10 2nd Avenue South,#D7,Pacheco,CA 94553-5560 <br /> McCAMPBELL ANALYTICAL INC Telephone 925-798-1620 Fax 925-798-1622 <br /> 24 http//www mccarnnhcIl com E-mail main@mccampbell cam <br /> Advanced GeoEnvironinental Client Project ID Thrifty Oil#772 Date Sampled 04/12/01 <br /> 837 Shaw Road Date Received 04/13/01 <br /> Stockton, CA 95215 Client Contact Bill Little Date Extracted 04/13/01 <br /> Client P O Date Analyzed 04/13/01 <br /> Gasoline Range (C6-C12)Volatile Hydrocarbons as Gasoline*, with Methyl tent-Butyl Ether* &BTEX* <br /> EPA methods 5030,modified 8015 and 8020 or 602 California RWQCB(SF Bay Region)method GCFI1D(5030) <br /> Lab 1D Client ID Matrix TPH(g)" MTBE Benzene Toluene Ethyl- Xylenes %Recovery <br /> benzene Surrogate <br /> 65402 Pre Ox Air 9100,a — 100 220 37 100 -- <br /> 65403 Post Ox Air ND --- ND ND ND 0 93 101 <br /> Reporting Limit unless Air 50 ug/L 50 0 5 0 5 05 0 5 <br /> otherwise stated ND <br /> means not detected above <br /> the reporting limit S 1 0 mg/kg 0 05 0 005 0 005 0 005 0 005 <br /> � <br /> *water and vapor samples are reported in ug/L,wipe samples in ug/wipe,soil and sludge samples in mg/kg and a[]TCLP and SPLP extracts <br /> in ug/L <br /> N cluttered chromatogram,sample peak coelutes with surrogate peak <br /> 'The following descriptions of the TPH chromatogram are cursory in nature and McCampbell Analytical is not responsible for their <br /> interpretation a) unmodified or weakly modified gasoline is significant b) heavier gasoline range compounds are significant(aged <br /> gasoline), c) lighter gasohne range compounds (the most mobile fraction) are significant, d) gasoline range compounds having broad <br /> chromatographic peaks are significant,biologically altered gasoline?,e)TPH pattern that does not appear to be derived from gasoline("),f) <br /> one to a few isolated peaks present g) strongly aged gasoline or diesel range compounds are significant, h)tighter than water immiscible <br /> sheen is present i)liquid sample that contains greater than 5 vol °/a sediment,3)no recognizable pattern <br /> DHS Certification No 1644 Edward Hamilton, Lab Director <br />