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TABLE 7 FLOW RATES AND ANALYTICAL RESULTS OF AIR SAMPLE ANALYSES-UNIT 2(SL NO 9230) ARCO Facility No 6100 25775 South Patterson Pass Road Tracy,California Date Flowrate Influent Sample Analyses(m m') (scfm)t (acfin) Tem (°F) ID GRO Benzene Toluene Ethylbenzene Xylenes MTBE 10/06/04 235 55 21443 120 6100TINF2 4,700 A 110 A 120 A l I A 71 A <0 50 A 6100CiNF2 1,600 A 41 A 39 A 3 6 A 21 A <0 50 A 6100EFF210604 57 A <0 50 A <0 50 A <0 50 A <0 50 A <0 50 A 10/14/04 29266 24669 145 6100INF2101404 2,000[2,5] A 44[2,5] A 48[2,5] A 5 8[2,5] A 30[2,5] A <2 5[2,5] A 6100EFF2101404 <50[4] A <0 50[4] A <0 50[4] A <0 50[4] A <1 0[4] A <0 50[4) A 11/04/04 217 15 20293 105 6100AINF-110404 3,200 A 110 A 94 A 63 A 34 A <0 50 A 6100ASYSINF-110404 1,000 A 34 A 30 A 2 3 A 12 A <050 A 6100AEFF-110404 160 A 4 3 A <0 50 A <012 A <012 A <0 14 A 11/11/04 12366 112 19 122 610OClNF2111104 2,200 A 38 A 33 A <50 A 9 5 A <5 0 A 6100£FF2111104 <50 A <0 50 A <0 50 A <050 A <0 50 A <0 50 A GRO=Gasoline Range Organics(C4-C12) MTBE=Methyl tertiary bury]ether WC=inches of water column mg/m'=milligrams per cubic meter Temp =Temperature in degree Fahrenheit Standard flow rate(scrm)measured using standard calibrated devices is converted to actual flow rate(acfm)using the following formulas QAIQC Review Pressure corrected influent flow rate Total influent air flow rate sefm* ((406 8'WC "WC)/406 8 WC) A=Data accepted without qualification Temperature Corrected influent flow rate Pressure corrected flow rate *((464 R+68deg F)1(deg F+460 R)) ]=Data accepted with qualification *=Average vacuum R=Data rejected i Field data sheets record flow rate(inches of water column,units)into the SVE system using a differential pressure guage and pitot tube These readings were converted to flowrate(acfm,units)in 2 inch diameter pipe [l]Primary and confirmation results varied by greater than 40%Relative Percent Difference(RPD) [2]Reporting limits.were raised due to high level of analyte present in the sample [3]The reported result for GRO is due to chromatographic peals present in the gasoline quantitation range however the peaks present do not resemble the pattern for gasoline [4]Extracted out of holding time [5]The elevated reporting limits were the result of dilutions performed by the laboratory in order to quantitate a target analyte ARCO 6ioo_0&M Page 2 of 2TUS