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Striker <br /> Sequoia a19mento,C Ave St <br /> Sacramento,CA 95. <br /> ��► Analytical (916)921-90 <br /> FAX(91 6)921-0 <br /> www secuotalabs t <br /> Weston Solutions Inc-Walnut Creek Project San Joaquin USA S409335 <br /> 1575 Treat Blvd,Ste 212 Project Number N/A Reported <br /> Walnut Creek CA,94596 Project Manager Greg Berner Menna 09/30/04 11 52 <br /> Purgeable Hydrocarbons and BTEX by EPA 8015B/8021B-Quality Control <br /> Sequoia Analytical-Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4090320-EPA 5030B(PIT) <br /> Laboratory Control Sample 4090320-BS1) Prepared&Analyzed 09/21/04 <br /> Benzene 11 6 050 ugll 10 0 116 70-130 <br /> Benzene 1 1 6 050 100 116 70-130 <br /> Toluene 1 1 3 0 50 to 0 113 70-IM <br /> Toluene 11 3 050 10 0 113 70-130 <br /> Ethylbenzene 11 3 0 50 " 10 0 113 70-130 <br /> Ethylbenzene 11 3 050 10 0 1 l3 70-130 <br /> Xylenes(total) 34 1 0 50 300 114 70-130 <br /> Xylenes(total) 34 1 050 300 114 70-130 <br /> Methyl tert-butyl ether 11 6 2 0 10 0 116 70-130 <br /> Surrogate 4-BFB(FID) 101 100 102 60-140 <br /> Surrogate 4-BFB(FID) 102 II 100 101 60-140 <br /> Surrogate a a a-TFT(PID) 8 82 100 88 60-140 <br /> Surrogate a a a-TFT(PID) 8 82 100 88 60-140 <br /> Surrogate a a a-Trifluorotoluene 000 100 0-100 <br /> Laboratory Control Sample(4090320-BS2) Prepared&Analyzed 09/22/04 <br /> Benzene 11 9 050 119/1 10 0 119 70 130 <br /> Benzene 11 9 050 100 119 70-130 <br /> Toluene 11 9 050 10 0 119 70-130 <br /> Toluene 11 9 050 10 0 119 70-130 <br /> Ethylbenzene 11 7 0 50 10 0 117 70-130 <br /> Ethylbenzene 11 7 0 50 10 0 117 70-130 <br /> Xylenes(total) 35 0 0 50 " 300 117 70-130 <br /> Xylenes(total) 350 0 50 300 117 70-130 <br /> Methyl tert-butyl ether 11 9 2 0 loo 119 70-130 <br /> Surrogate 4-BFB(FID) 115 100 115 60-140 <br /> Surrogate 4-BFB(FID) 11 5 100 115 60-140 <br /> Surrogate a a a-TFT(PID) 104 10 0 104 60-140 <br /> Surrogate a a a-TFT(PID) 104 10 0 104 60-140 <br /> Sui rogate a a a-D ifluorotoluene 000 10 0 0 200 <br /> Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chair, <br /> of custody document Unless otherwise stated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 6 of <br /> 1 <br />