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Sequoia 819 arra Avenue S 8 ID Sacramento CA 95858 34 (916)921-9600 Analytical www sequoFAX quo labsZ 1 c 00 �aabs com Stratus Envuonrnental Project ARCO 2186,Stockton, CA Sampled 6122/00 3330 Cameron Park Drive, Ste 550 Project Number N/A Received 6/23/00 Cameron Palk,CA 95682 Project Manager Jay Johnson Reported 7/5/00 BTEX by EPA Method 8260A/Quality,Co6trol` Sequoia Analytical-Sacramento Date Spike Sample QC Reporting Limit Recov RPD RPD Analyte Analyzed Level Result Result Units Recov limits % Limit % Notes* Blank continued 0060307-BLK1 Ethylbenzene 6/30/00 ND ug/1 200 Xylenes(total) ND 200 Sui rogate 12-DCA-d4 500 524 600-140 105 Surrogate Toluene-d8 500 520 600-140 104 Surrogate 4-BFB 500 476 600-140 952 LC SS 0060307-BSI Benzene 6/30/00 500 51 8 ug/1 700-130 104 Toluene 500 508 700-130 102 Surrogate 1,2-DCA-d4 500 568 600-140 114 Surrogate 7 oluene-d8 500 52 4 600-140 105 Surrogate 4-BFB 500 48 4 600-140 968 LCS Dun 0060307-BSDI ne 6130/00 500 50 8 ug/l 700-130 102 250 194 ene 500 494 700-130 988 25 0 3 19 Surrogate 1 2-DC4-d4 500 )4 8 60 0440 110 Surrogate Toluene--d8 500 49 6 600-140 992 surrogate 4-BFB 500 45 8 600-140 916 Matrix Spike 0060307-MSI 5006355-02 Benzene 6/30/00 500 1\p 48 0 ug/l 700-130 960 Toluene 11 500 ND 488 700-130 976 Surrogate 1,2-DCA-d4 —500 562 600-140 112 Surrogate Toluene-d8 500 508 600-140 102 Suri agate 4-BTB 500 472 600-140 944 Matrix Spike Dup 0060307-MSDI S00635--02 I3enzene 6130100 500 ND 494 ug/l 700-130 988 250 287 Toluene 500 ND 48 8 700-130 976 250 0 Surrogate 1,2-DC4-d4 500 554 600-140 111 Surrogate Toluene-d8 500 500 600-140 100 Surrogate 4-BFB 500 468 600-140 93 6 S a Analytical-Sacramento *Refer to end of repot t for text of notes and definitions Page 9 of 12