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f <br /> Ci Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364 9600 FAX(650)364-9733 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (925)988 %00 FAX(925)988-9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-01oo <br /> 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792 1865 FAX(707)79Z-0342 <br /> EMCON -Sac Project ARCO 2130 Stockton CA Samplcd 1212/98 <br /> 1433 N Market Blvd Project Numbei 21775-229 003 Received 1213/98 <br /> Sacrdmento,CA 95834 Project Managet Dave Foley Reportcd 12/17/98 <br /> Total Purgeable Hydrocarbons(C6-C12), BTEX and MTBE by DHS LUFTIQuality Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Lieut Recov RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov Limits % Limit % Notes" <br /> Batch—B120106 <br /> BLUE S 120106-BI,Kl <br /> Purgeable Hydrocarbons 12/7/98 ND ug/I 500 <br /> Benzene ND 0 500 <br /> Toluene ND 0 500 <br /> Ethylbenzene ND 0 500 <br /> Xylenes(total) ND 0 500 <br /> Methyl Cert-butyl ether ND Soo <br /> Surrogate a,a a-Tnfluorotoluene /0 0 883 600-140 883 <br /> L-CS 512.4.106-113ST <br /> Benzene 1217Y98 10 0 104 ug/I 700-130 104 <br /> Toluene too 965 700-130 965 <br /> Ethylbenzene l0 0 9 63 700-130 963 <br /> Xylenes{total) 30 0 28 5 70 0-[30 95 0 <br /> ]tert-butyl ether 10 0 12 3 70 0-130 123 <br /> ate a,a,a-Tnfluorotoluene 10 0 8 69 60 0-140 86 9 <br /> Matnx-,$mac $120106-NISI S812046-07 <br /> Benzene 12/7198 t0 0 ND 105 ug/l 600-140 105 <br /> Toluene 100 ND 9 84 600-140 98 4 <br /> Ethylbenzene 100 ND 973 600-140 973 <br /> Xylenes(total) 300 ND 294 600-140 980 <br /> Methyl tert-butyl ether 100 ND 13 l 600-140 131 <br /> Surrogate a s a-Trifluorotoluene 100 966 600-140 966 <br /> Matrix Spike nen 8120106-MSD1 5812046-07 <br /> Benzene 12/7/98 100 ND 104 ug/I 600-140 104 25 0 0 957 <br /> Toluene 100 ND 967 60 0-i40 96 7 25 0 1 74 <br /> Ethylbenzene 100 ND 953 600-140 953 25 0 2 08 <br /> Xylenes(total) 300 ND 2$ 8 60 0-140 96 0 25 0 2 06 <br /> Methyl tert-butyl ether 100 ND 14 2 60 0-140 42 25 0 8 06 4 <br /> 1 <br /> Surrogate a,a a-Trifluorotoluene 10 0 970 600-140 91 0 <br /> Batch. 8120107 Date Prepared 12/7/98 Extraction Method LEA 5030B (pT) <br /> Blank $120107-BLK1 <br /> Purgeable Hydrocarbons 12/7/98 ND ugll 50 0 <br /> Benzene <br />� Toluene ND 0 500 <br /> ND 0 500 <br /> Ethylbenzene ND 0 500 <br /> Xylenes(total) ND 0 500 <br /> Meth ] tert-butyl ether ND 500 <br /> Seq'W Analytical-Sacramento *Refer to end of report for text of notes and definitions <br /> 7F <br /> Ronald W Bobel,Client Services Representative <br /> Page 6 of 10 <br />