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819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento,CA 95834 <br /> (916)921-%W <br /> FAX(916)921-0100 <br /> Analytical www sequoialabs com <br /> Delta Environmental Consultants(Cameron Park) Project Arco 2130,Stockton, CA <br /> 3330 Cameron Park Dr Ste 550 Project Number 2130,Stockton,CA Reported <br /> Cameron Park CA,95682 Projectmanager Steve Carter 03/25/02 13 20 <br /> BTEX by EPA Method 8260B - 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 2030202-EPA 5030B (P/T] <br /> Blank(2030202-BLKI) Prepared&Analyzed 03/15/02 <br /> Benzene ND 050 ug/l <br /> Toluene ND 050 <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 0 50 " <br /> Surrogate 1 2-DCA-d4 189 250 75 6 60-140 <br /> Surrogate Toluene-d8 218 25 0 872 60-140 <br /> Surrogate 4-BFB 22 6 25 0 904 60-140 <br /> LCS(2030202-BSI) Prepared&Analyzed 03/15/02 <br /> Benzene 225 0 50 ug11 250 90 0 70-130 <br /> oluene 24 4 0 50 250 97 6 70-130 <br /> rogate 12-DCA-d4 195 250 78 0 60-140 _— <br /> Surrogate Toluene-d8 213 250 852 60-140 <br /> Surrogate 4-BFB 23 4 250 93 6 60-140 <br /> Matrix Spike(2030202-MSI) Source S203229-07 Prepared&Analyzed 03/15/02 <br /> Benzene 234 0 50 ug/l 250 ND 931 70-330 <br /> Toluene 259 0 50 250 ND 103 70-130 <br /> Surrogate 1 2-DCA-d4 19 7 250 788 60-140 <br /> Surrogate 7'oluene-d8 215 250 860 60-140 <br /> Surrogate 4-BFB 22 8 250 912 60-140 <br /> Matrix Spike Dup(2030202-MSDI) Source 5203229-07 Prepared&Analyzed 03/15/02 <br /> Benzene 22 6 0 50 ug/l 250 ND 899 70-130 348 25 <br /> Toluene 247 050 250 ND _ 48 1 70-130 474 25 <br /> Surrogate 1 2-DCA-d4 204 250 816 60-140 <br /> Surrogate Toluene d8 21 7 250 868 60-140 <br /> Surrogate 4-BFB 220 250 880 60-140 <br /> Allk <br /> equoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 9of11 <br />