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COLUMBIA ANALYTICAL SERVICES,INC <br /> Analytical Report <br /> Client ARCO 1'IodU'-LS Compan% Service Request S970196I <br /> Protect 20805-114 008/TO920791 0012130 STOCKTON Date Collected NA <br /> Sample Matrt\ Air Date Received NA <br /> BTEX and Total Volatile Hydrocarbons <br /> Sample Name Method Blank Units mg/m3 <br /> Lab Code S971001-VB l Basis NA <br /> Test Notes <br /> Prep Analysts Dilution Date Date Result <br /> Analyte Method Method MRL Factor Extracted Analyzed Result Notes <br /> Benzene )030 9020 04 1 NA 10/1/97 ND <br /> Toluene )030 9020 04 1 NA 10/1/97 ND <br /> Ethylbenzene D030 8020 05 1 NA 10/1/97 ND <br /> Xylenes Total X030 8020 0 9 1 NA 10/1/97 ND <br /> Total Volatile HN droc,arbons <br /> C1 -C5 5030 8015M 12 1 NA 10/1/97 ND <br /> C6-C12 5030 8015M 20 1 NA 10/1/97 ND <br /> TPH as Gasohne* 5030 8015M 20 1 NA 1011197 ND <br /> * TPH ati gasoline is defined as C6(benzene)through C 12(dodecane)and uses a <br /> molecular wtight of 100 to c.a LWate the ppmv <br /> ]S2u020597p <br /> Page 7 <br />