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a �E7 s FLOW RATES AND ANALYTICAL RESULTS OF AIR SAMPLE ANALYSES-UNIT 2 (SL NO 9230) ARCO Facility No 6100 25775 South Patterson Pass Road T1acy,Califomla Date Flowrate Influent Sample Analyse (nirn) (scfm)' (aefin) Tem °I ID GRO Benzene Toluene Et1t [benzene xylenes MT13L 10/06/04 23555 21443 120 6100TINF2 4,700 A 110 A 120 A I 1 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 28266 24669 145 61001NF2101404 2,000[2,5] A 44[2,5] A 48[2,5] A 5 8[2,51 A 30[2,5] A <2 5[2,51 A 6100EFF2101404 <50[4] A <0 50[4] A <0 50[4] A <0 50[4] A <1 0t4] A <0 50[41 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 23 A 12 A <0 50 A 6100AEFF-110404 160 A 43 A <0 50 A <0 12 A <0 12 A 0 14 A 11/11/04 123 66 112 19 122 6100CINF2111104 2,200 A 38 A 33 A <5 0 A 9 5 A <5 0 A 6100EFF2111104 <50 A <0 50 A <0 50 A <0 50 A <0 50 A <0 50 A RO=Gasoline Range Organics(C4 C12) MTBE=Methyl tertiary butyl ether WC=inches of water column mg/ml-milligrams per cubic meter Temp =Temperature to degree Fahrenheit Standard flow rate(scfm)measured using standard calibrated devices is converted to actual flow rate(acfm)using the following formulas QA/QC Review Pressure corrected influent flaw rate Total influent air flow rate scfm*{(406 8'WC-VC)/406 8"WC) A-Data accepted without quali l icalion Temperature Corrected influent flow rate Pressure corrected flow rate `{(460 R+68deg I y(deg 1'+460 R)) J—Dam accepted with qualiflcatinn '=Average vacuum R=Nia tLjer ted 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 [1]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 peaks present in the gasoline quantitation range however the peals present do not resemble the pattern for gasoline [41 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-6 100 0&M Page oft 51'gATU5