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q 885 Jarvis Drive <br /> Sequoia Morgan Hill CA 95037 <br /> 9�D— (408)776 9600 <br /> 0 1:::22 <br /> a,J Analytical 1 AX(408)782 6308 <br /> www sequoialabs Lom <br /> URS Corporation[Arcola Project BP Heritage 411191,Stmkton,CA MPA 1167 <br /> 2870 Gateway Oaks Dr, Ste 300 Project Number 607WW-0016 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 02/10/06 14 48 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Nates <br /> Batch 6A31010-EPA 5030E PIT I EPA 8260B <br /> Matrix Spike(6A31010-MSI) Source MPA1135-06RE1 Prepared&Analyzed 01/31/06 <br /> tert Amy]methyl ether 176 5 0 up,/[ 163 ND 108 80-1 t5 <br /> Benzene 480 5 0 504 ND 95 65-115 <br /> tert Butyl alcohol 2340 200 1690 800 91 75-120 <br /> Di-isopropyl ether 158 50 162 ND 98 75-125 <br /> 1'thanol 1350 3000 1650 ND 82 70-135 <br /> Ethyl tert-butyl ether 158 50 164 ND 96 75-130 <br /> Ethylbenzene 675 5 0 728 ND 93 75-135 <br /> Methyl ter£-butyl ether 308 5 0 784 250 74 65-125 <br /> Toluene 399 5 0 380 ND 105 85-120 <br /> Xylenes(total) 428 5 0 408 ND 105 85-125 <br /> Gasoline Range Organics(C4-C12) 4200 500 4400 300 89 60-140 <br /> 6Surrogatl 12 Dichloroethane-d4 4 59 500 92 60-135 <br /> Matrix Spike Dup(6A3[010-MSDL) Source MPA1135-06RE1 Prepared&Analyzed 01/31/06 <br /> tert-Amyl mlthy]Ltht r 185 5 0 ug/I 163 ND 113 80-115 5 15 <br /> Benzene 506 5 0 504 ND 100 65-115 5 20 <br /> tert-Butyl alcohol 2430 200 1690 800 96 75-120 4 25 <br /> Di isopropyl ether 168 5 0 162 ND 104 75-125 6 15 <br /> Ethanol 1380 3000 1650 ND 84 70-135 2 35 <br /> Fthyl tert-butyl ether 167 50 164 ND 102 75-130 6 25 <br /> Ethylbenzene 666 5 0 729 ND 91 75-135 1 15 <br /> Methyl tent-butyl Lther 325 5 0 78 4 250 96 65-125 5 20 <br /> Toluene 413 5 0 380 ND 109 85-120 3 20 <br /> Xylenes(total) 405 5 0 408 ND 99 85-125 6 20 <br /> Gasoline Range Organics(C4 C12) 4310 500 4400 300 91 60-140 3 25 <br /> Surrogaic 12 Dichloroethane-d4 4 75 500 Y 95 60-135 <br /> Sequoia Analytical - Morgan Hill The resalts in this report apply to the samples analyzed in accordance with thL chain of <br /> custody document Unless othi rwise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 9 of 10 <br />