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885 Jarvis Dr37 <br /> ive <br /> Sequoia MorganHdl CA95037 <br /> (408)776 9600 <br /> Analytical FAX(408)782-6308 <br />-�- www sequoialabs cum <br /> Secor-Rancho Cordova(ARCO) Project ARCO#4932,Stockton,CA MNI0277 <br /> 3017 Kilgore Rd Suite 100 Project Number NIP Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 09/23/04 16 56 <br /> Purgeable Hydrocarbons and BTEX by EPA 8015B/8021B -Quality Control <br /> Sequoia Analytical- Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4I13005-EPA 50308 [P/T] <br /> Laboratory Control Sample(4I13005-BS2) Prepared&Analyzed 09/13/04 <br /> Gasoline Range Organics(C4 C 12) 167 2 4 ppmv 15 6 107 65 142 <br /> Gasoline Range Organics(C4 C12) 588 10 mg/ml Air 550 107 65 142 <br /> Surrogate 4 Bromafluorobenzene 126 ppmv 112 111 70 130 <br /> Surrogate 4 Bromofluorobenzene 900 mglW Air 800 111 70-130 <br /> Laboratory Control Sample Dup(4113005-ESDI) Prepared&Analyzed 09/13/04 <br /> Benzene 2 14 010 mg/ml Air 2 00 107 62-125 5 31 <br /> Benzene 0 670 0 031 ppmv 0 627 107 62-125 5 31 <br /> Toluene 2 18 0 10 mg/ml Air 200 109 68-121 3 29 <br /> Toluene 0 580 0 027 ppmv 0 532 109 68 121 3 29 <br /> Ethylbenzene 2 17 0 10 mg/ml Air 200 108 75-125 3 32 <br /> Ethylbenzene 0 502 0 023 ppmv 0 462 109 75-125 2 32 <br /> Xylenes(total) 1 54 0 047 11 1 38 112 76-121 2 29 <br /> Xylenes(total) 6 67 020 mglm'Air 600 111 76-121 2 29 <br /> Methyl tert-butyl ether 1 29 0 14 ppmv 1 11 116 70-130 2 25 <br /> Methyl cert butyl ether 464 0 50 mg/ml Air 4 00 116 70-130 3 25 <br /> Surrogate a a a Trifluorotoluene 7 79 11 800 97 56-134 <br /> Surrogate a a a Trifluorotoluene 131 ppmv 134 98 56-134 <br /> Surrogate 4-Brom0fluorobenzene 823 mg/ms Air 8 00 103 70-130 <br /> Surrogate 4-Bromofluorobenzene 115 ppmv 112 103 70-130 <br /> Laboratory Control Sample Dup(4113005-BSD2) Prepared&Analyzed 09/13/04 <br /> Gasoline Range Organics(C4 C 12) 764 10 mg/m'Air 550 139 65-142 26 50 <br /> Gasoline Range Organics(CLI-C 12) 21 7 2 4 ppmv 15 6 139 65-142 26 50 <br /> Surrogate 4 Bromofluorobenzene 131 1 11 117 70-130 <br /> Surrogate 4 Bromofluorobenzene 939 mglm'Air 800 117 70-130 <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 13 of 15 <br /> I <br />