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Sequoia 819 r Avenue,Suite 8 Sacramento CA 95834 (916)921-%00 FAX 100 Analytical www sequo3alabs com Stratus Environmental Ptoject ARCO 2168, Stockton,CA Sampled 6/22/00 3330 Cameron Park Drive,Ste 55o Project Number N/A Received 6/23/00 Cameron Park,CA 95682 Project Manager Jay Johnson Reported 7/11100 BTEX by EPA Method 8260Aj'Quahty Control Sequoia Analytical-Sacramento Date Spike Sampie QC Reporting Limit Recov RPD RPD Analyte Analyzed Level Result Result Units Recov Limits % Limit % Notes* LCS Dup(continued) _ _ 0060307-BSD1 Surrogate Toluene-d8 6/30/00 50 0 49 6 ug/1 600-140 992 Sunogate 4-BFB 500 4.58 600-140 916 Matrix Spike 0060307-MSI S006355-02 Benzene b/30/00 500 ND LIS 0 ug/1 700-130 U6 0 Toluene 50 0 ND 488 700-130 97 6 Surrogate 1,2-DCA-d4 50 0 )6 2 600-140 112 Surrogate Toluene-d8 500 jos 600-140 102 Su)rogate 4-BFB 500 472 600-140 944 Matrix Spike Dun 0060307-MSDI S006355-02 Benzene 6130/00 500 ND 494 ug/l 700-130 488 25 0 2 87 Toluene 50 0 ND 48 8 700-130 976 25 0 0 _ Surrogate 1,2-DCA-d4 50 0 ,ij 4 " 600-140 111 *S ate Toluene-d8 500 500 600-140 100 ate 4-BFB 500 468 600-140 936 Batch 0070016 _Date Prepared 7/6/00 Extraction Method EPA 5030B EP/T1 Blank 00700I6-BLKI Benzene 7/6100 ND ug/1 2 00 Toluene ,\'D 2 00 Ethylbenzene ND 2 00 Xylenes(total) _ 210 200 Surrogate 1 2-DCA-d4 50 0 468 60 0-140 93 b Surrogate Toluene-d8 50 0 518 600-140 104 Surrogate 4-BFB 500 48 8 600-140 976 LCS 0070016-BS] Benzene 7/6/00 50 0 53 2 ug/l 700-130 106 Toluene 50 0 55 8 700-130 112 _ Surrogate I io50 0 47 2 60 0-140 94 4 Surrogate Toluene-d8 500 514 600-140 103 Surrogate 4-BFB 500 488 600-140 976 LCS Dup 0070016-BSD1 Beclzene 7t6/00 50 0 540 ug/1 700-130 208 25 0 1 87 Toluene 50 0 51 6 _ 70 0-130 103 25 0 837 Suri ogate 1 2-DCA-d4 S0 0 478 _ " 600-140 956 Su,rogate Toluene-d8 500 520 600-140 104 Surrogate 4-BFB 500 48 0 600-140 960 SW Analytical-Sacramento *Refer to end of report for text of notes and definitions Page 12 of 15