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COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/QC Report <br /> . Client ARCO Products Compam' Servos Request• S97005ol <br /> Pi elect 2 168 STOCKTON/20805-146 M WT0#20682 00 Date Collet-ted: 3/20/97 <br /> Sample Mata ix Air Date Received: 3/21/97 <br /> Date ExtraLted: N/A <br /> Date Analyzed: 3/21/97 <br /> Duplicate Summary <br /> BTEX and Total Volatile Hydrocarbons <br /> Units mg/nn' <br /> Sample Name INFLUENT <br /> Lab Code S970050I-001 <br /> Dupl1L4te Relative <br /> Sample Sample Percent <br /> Analvte M RL Re%ult Result Average Differente <br /> Benzene 0 4 190 160 180 17 <br /> Toluene 0 4 950 850 900 11 <br /> Etlivlbenzene 0 5 120 110 120 9 <br /> Xylenes Total 09 770 710 740 8 <br /> Total Volatile HNdrocarbons <br /> Cl -C5 12 4400 3,000 3,700 38 <br /> C6 - C12 20 14000 14,000 14,000 <1 <br /> TPH as Gasoline` 20 14000 14,000 14,000 <1 <br /> Methvl tert-Buts l Ether 3 100 76 88 27 <br /> Note ppmV = mg/m' \ 124 45 (gas constant)/ molecular weight (MW)] <br /> MW Benzene = 78 Toluene= 92 EthN lbenzene= 106, Total Xvlenes= 106 <br /> MW Gasohne= 100 <br /> * TPH as gasoline is defined as C6 (benzene) through C12 (dodecane) and uses a <br /> molecular weight of 100 to calculate the ppmv <br /> DUP I SWO60194 <br /> Page 7 <br />