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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364 9600 FAX(650)364 9233 <br /> 444 N Wiget Lane Walnut Creek CA 94598 (925)988 %00 FAX(925)988 9673 <br /> Analytical 819 Striker Avenue Swte 8 Sacramento CA 95834 (916)921 9600 FAX(916)921 of 00 <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 Sampled 9/1198 <br /> 1433 N Market Blvd Project Number 21775-229 003 Received 9/2198 <br /> Sacramento,CA 95834 Project Manager Dave Foley Reported 9/24/98 <br /> Total Purgeable Hydrocarbons(C6-C12), BTLX and MTBE 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 <br /> FUnits Recov Limits % Limit % Notes' <br /> Batch 8090104 Date Prepared, 9/1012R ExlEac(jon MethQd. EPA 5030B(PIT) <br /> MUIR 8090104-13 L K <br /> Purgeable Hydrocarbons 9/10/98 ND ug/I Soo <br /> Benzene <br /> Toluene ND „ 0 500 <br /> ND 0 500 <br /> Ethylbenzene ND 0 500 <br /> Xylenes(total) ND 0 500 <br /> Methyl tent-butyl ether ND 500 <br /> Surrogate a a a-Triuorotoluene 100 986 600-140 98 6 <br /> LCS 8090104-RSI <br /> Benzene 9/10/98 ]0 0 981 ug/l 700-130 98 l <br /> Toluene l0 0924 700-130 924 <br /> " <br /> Ethylbenzene 100 925 700-130 925 <br /> Xylenes(iota[) 30 0 27 6 70�14 <br /> tent-butyl ether !0 0 !0l70 101 <br /> Sua,a a-Trifluorotaluene f0099000 0 99 0 <br /> Matrix Spike $090104-MS1 S80.9013-04 <br /> Benzene 9/10/98 100 ND 945 ug/l 600-140 945 <br /> Toluene 100 ND $90 600-140 890 <br /> Ethylbenzene 100 ND 874 600-140 87 4 <br /> Xylenes(total) 300 ND 263 600-140 877 <br /> Methyl tert-butyl ether too ND 211 600-140 NR <br /> Surrogate a a,a-Trrfluorotoluene 5 <br /> 10 0 9 75 600-140 975 <br /> Matrix Spike nun 809QI04_MSDI S809013-04 <br /> Benzene 9/10/98 100 ND 966 ug/l 600-140 966 250 2 20 <br /> Toluene 10 0 ND 9 25 600-140 925 25 0 3 86 <br /> Ethylbenzene 100 ND 894 600-140 894 250 2 26 <br /> Xylenes(total) 300 ND 269 600-140 897 25 0 2 25 <br /> Methyl tert-butyl ether 100 ND 14 3 600-140 143 250 175 5 <br /> Surrogate a a a-Trifluorotoluene 100 940 600-140 94 0 <br /> 96 <br /> 15eq Analytical-Sacramento *Refer to end of repot t for teAt of notes and definitions <br /> tonald W Bobel,Client Services Representative Page 5 of 7 <br />