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a— ) (7Sequoia 1455 McDowell Blvd,North Ste <br /> 07)Petaluma,CA 949544 <br /> 792-1865 <br /> Analytical <br /> FAX(707)792-0342 <br /> www sequoialabs com <br /> Secor-Rancho Cordova Project Arca Site 4932,Stockton,CA P402158 <br /> 3017 Kilgare Road Suite 100 Project Number 38984 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 02/20/04 12 06 <br /> Purgeable Hydrocarbons and BTEX by EPA 8015B/8021B-Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units level Result %REC Limas RPD Limit Notes <br /> Batch 4020144-EPA 5030B,waters <br /> Matrix S ike 4020144-MS1 Source P401494-10 Prepared&Analyzed 02/06/04 <br /> Gasoline Range Organics 862 14 ppmv 780 110 96 65-135 <br /> Gasoline Range Organics 3040 50 mg/ml Air 2750 400 96 65-135 <br /> Benzene 13 8 0 16 ppmv 12 5 0 035 110 65-135 <br /> Benzene 441 050 mg/ml Air 400 0 11 110 65-135 <br /> Toluene 233 0 50 186 ND 125 65-135 <br /> Toluene 61 8 0 13 ppmv 49 3 ND 125 65-135 <br /> Ethylbenzene 120 0 12 " 100 033 117 65-135 <br /> Ethylbenzene 51 9 050 mg/ml Air 435 1 4 116 65-135 <br /> Xylenes(total) 236 0 50 " 210 ND 112 65-135 <br /> Xylenes(total) 54 6 0 12 ppmv 48 6 ND 112 65-135 <br /> Methyl tert-butyl ether 79 0 2 0 mg/ml Air 620 4 1 121 65-135 <br /> Methyl tert-butyl ether 22 0 0 56 ppmv 172 1 1 122 65-135 <br /> Surrogate a a a-Trtfluorotoluene 58 8 11 .503 117 65-135 <br /> Surrogate a a a-Trifluorotoluene 351 mg/m'Air 300 117 65-135 <br /> Surrogate 4-Bromofluorobenzene 44 7 ppmv 419 107 65-135 <br /> Surrogate 4-Bromofluarobenzene 320 mg/m'Air 300 107 65-135 <br /> Matrix Spike Dup(4020144:MSD1) Source P401494-10 Prepared&Analyzed 02/06/04 <br /> Gasoline Range Organics 3050 50 mg/m3 Air 2750 400 96 65-135 0 3 20 <br /> Gasoline Range Organics 865 14 ppmv 780 110 97 65-135 0 3 20 <br /> Benzene 43 9 050 mg/ml Air 400 0 11 109 65-135 0 5 20 <br /> Benzene 13 8 0 16 ppmv 125 0 035 110 65-135 0 20 <br /> Toluene 61 4 0 13 " 493 ND 125 65-135 0 6 20 <br /> Toluene 231 0 50 mg/m'Air 186 ND 124 65-135 0 9 20 <br /> Ethylbenzene 122 0 12 ppmv 100 0 33 119 65-135 2 20 <br /> Ethylbenzene 52 8 0 50 mg/ml Air 43 5 1 4 118 65-135 2 20 <br /> Xylenes(total) 237 0 50 11 210 ND 113 65-135 0 4 20 <br /> Xylenes(total) 54 6 0 12 ppmv 48 6 ND 112 65-135 0 20 <br /> Methyl tert-butyl ether 77 5 2 0 mg/ml Air 62 0 4 1 118 65-135 2 20 <br /> Methyl tert-butyl ether 21 5 0 56 ppmv 172 1 1 119 65-135 2 20 <br /> Surrogate a a a-Trtfluorotoluene 340 mg/m'Air 300 113 65-135 <br /> Surrogate a a a-Trifluorotoluene 569 ppmv 503 113 65-135 <br /> Surrogate 4-Bromofluorobenzene 438 " 419 105 65-135 <br /> Surrogate 4-Bromofluorobenzene 313 mg/m'Air 300 104 65-135 <br /> isSequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <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 13 of 18 <br />