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i <br /> Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wrger Lane Walnut Creek.CA 94598 (925)988 9600 FAX(925)988 9673 <br /> 819 Sinker Avenue Suite 8 Sacramento CA 95834 (916)921 9600 FAX(916)921 0100 <br /> Analytical <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707) 792 1865 FAX(707)792 0342 <br /> • <br /> SECOR International Project ARCO 2133,Stockton,CA Sampled 9110198 <br /> 9912 Business Park Drive,Ste 100 Project Number Contract#22232 03 Received 9/14198 <br /> Sacramento,CA 95827 Project Manager Rusty Benkosky Reported 9128198 <br /> Total Purgeable Hydrocarbons(CG-C12),B IEX and MTBE by DHS LUFT1Quality Control <br /> Sequoia Analytical- Sacramento <br /> Date Spike Sample QC Reporting Limit Recov RPD RPD <br /> Analyte Analy7cd Level Result Result Units Rccov Limits % Limit % Notes* <br /> Batch 4 Date Prepared. 9121198 Extraction h1 li I 3 B T <br /> Blank 8090194-13LKI <br /> Purgeable Hydrocarbons 9/21/98 ND ug/1 �;0 0 <br /> Benzene ND 0 500 <br /> Toluene ND 0 500 <br /> Ethylbenzene ND 0 500 <br /> Xylenes(total) ND 0 500 <br /> Methyl tori-butyl ether ND 5 00 <br /> Surrogate a a a-Trifluorotoluene 100 924 600-140 92 4 <br /> L-C—S 8090194-13S1 <br /> Benzene 9/21/98 t0 0 10 2 ug/l 700-130 102 <br /> Toluene 100 957 700-130 95 7 <br /> Ethylbenzene 100 934 700-130 93 4 <br /> WPenes(total) 300 28 1 700-130 93 7 <br /> thyl tert-butyl ether 100 104 70 0-130 104 <br /> Surrogate a a a-Trifluorotoluene 100 987 600 140 98 7 <br /> Matrix Spike 8090194-MSI 5809228-03 <br /> Benzene 9121198 10 0 ND 986 ug/1 600-140 986 <br /> Toluene 10 0 ND 933 600-140 933 <br /> Ethylbenzene 100 ND 9 12 60 0-140 91 2 <br /> Xylenes(total) 300 ND 274 600-140 91 3 <br /> Methyl tert-butyl ether 100 ND 967 600-140 967 <br /> Surrogate a a a-Trrfluorotoluene 100 883 600-140 883 <br /> Matrix Spikc.Dup 8090194-M SD I 5809228-03 <br /> Benzene 9121198 10 0 ND 976 ug/1 600-140 976 25 0 1 02 <br /> Toluene 100 ND 9 53 600-140 953 250 2 12 <br /> Ethylbenzene 100 ND 9 31 600-140 93 1 25 0 2 06 <br /> Xylenes(total) 300 ND 28 0 600-140 933 250 2 17 <br /> Methyl tert-butyl ether 100 ND 10 2 600-140 102 25 0 533 <br /> Surrogate a a a-Trifluorotoluene 10 0 867 600 140 86 7 <br /> Batch, 809020 Date Prepared, 9121198 Extraction Method EPA 5030E(PIT) <br /> Blank 89— _BLY19020 1 <br /> Purgeable Hydrocarbons 9121198 ND ug/1 Soo <br /> Benzene ND 0 500 <br /> Toluene ND 0 500 <br /> Ethylbenzene ND 0 500 <br /> Xylenes(total) ND 0 500 <br /> thyl tert-butyl ether ND " )00 <br /> Sequoia Analytical -Sacramento *Refer ru erxl of?eport for text of notes and definruons <br /> Page 6 of 9 <br /> (/,-da Schneid r, Laboratory Director <br /> nn <br />