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l a j Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N Wrget Lane Walnut Creek CA 94598 (925)988 %00 FAX(925)988-9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)9Z1-9600 FAX(916)1)21-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792 0342 <br /> EMCON -Sac Project ARCO 2130,Stockton,CA <br /> 1433 N Market Blvd Sampled I�I�/9S <br /> Project Number 21775-229 003 Received 12/3195 <br /> Sacramento,CA 95834 Project Manager Dave holey <br /> Reported 12/17/98 <br /> Total Purgeable Hydrocarbons(C6-C12), BTEX and 1%1TBE by DHS LUFT/Quality Control <br /> Sequoia Analytical -Sacramento <br /> Date Spike Sample QC Reporting Limit Recov RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov Limits % Limit % Notes* <br /> 19ank(continued) 8120107-13 .1c 1 <br /> Surrogate a a a-Trij7uorotoluene 12/7/98 100, 899 ug/1 600-140 899 <br /> L.CS B120107-USI <br /> Benzene 1217198 100 106 ug/1 700-130 106 <br /> Toluene 10 0 9 95 70 0-130 49 5 <br /> Ethylbenzene 10 0 974 700-130 97 4 <br /> Xylenes(total) 300 29 3 700-130 97 7 <br /> Methyl tert-butyl ether 100 1 1 6 700-130 116 <br /> Surrogate a a a-Tnfluorotoluene IOU 8 98 600-140 89 8 <br /> Matrix Spike 8120I07-(1I S812017-07 <br /> Benzene 1217198 100 ND 10 3 u8/1 600-140 103 <br /> Toluene 10 0 ND 9 55 60 0-140 95 5 <br /> Ethylbenzene 100 ND 938 600-140 93 8 <br /> s(total) " 300 ND 285 60 0-140 95 0 <br /> 1 Cert-butyl ether 100 ND 13 0 600-140 130 <br /> Surrogate a,a a-Trifluorotaluene 10 0 9 11 60 0-140 91 1 <br /> Matrix;Spice Dn 8120107_MSDI S812017-07 <br /> Benzene 1217198 100 ND 108 ug/1 600-140 108 25 0 4 74 <br /> Toluene 100 ND 10 l 600-140 101 25 0 5 60 <br /> Ethylbenzene 1100 ND 990 60 0-140 99 0 25 0 5 39 <br /> Xylenes(total) 300 ND 300 60 0-140 100 25 0 5 13 <br /> Methyl tent-butyl ether 100 ND 142 600-140 142 25 0 882 4 <br /> Surrogate a a a-Trifluoratoluene /00 9 84 60 0-140 984 <br /> Batch, 8120121 ate Pre aced 1,2/8/98 <br /> Blank SJ 0127-BLE 1 <br /> Purgeable Hydrocarbons 12/8/98 ND ug/l 500 <br /> Benzene <br /> Toluene ND ND 0 500 Ethylbenzene N 0 500D 0 500 <br /> Xylenes(total) ND 0 500 <br /> Methyl tert-butyl ether ND 5 o0 <br /> Surrogate a a a-Trrfluorotoluene 100 10 0 60 0 140 100 <br /> L-C-S 812Q127-RSI <br /> Benzene 12/8/98 100 107 ug/l 700-130 107 <br /> Toluene 100 100 700-130 100 <br /> Ethylbenzene 100 974 70 0-130 97 4 <br /> Xylenes(total) 300 294 700-130 98 0 <br /> An <br /> Se Analytical -Sacramento ' *Refer to end of report for teal of notes and dcfiritnorrs� <br /> Ronald W Bobel,Client Services Representative <br /> Page 7 of 10 <br />