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819 Striker Avenue Suite 8 <br /> Sequoia Sacramento C 95834 <br /> (916)922 1-960096W <br /> FAX(916)921-0100 <br /> IWO Analytical www sequoialabs com <br /> i <br /> Gettler-Ryan-Rancho Cordova Project Unocal 0187,Stockton,CA 5207242 <br /> 3140 Gold Camp Dr,Ste 170 Project Number N/A Reported <br /> Rancho Cordova CA,95670 Project Manager David Herzog 07/30/02 16 41 <br /> Total Purgeable Hydrocarbon, BTEX and MTBE by DHS LUFr - Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source °/6REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2070256-EPA 5030B PIT <br /> Laboratory Control Sample(2070256-BSI) Prepared&Analyzed 07/25/02 <br /> Benzene 102 050 ug/1 100 102 70-130 <br /> Toluene 107 050 100 107 70-130 <br /> Ethylbenzene 106 050 100 106 70-130 <br /> Xylenes(total) 324 050 300 108 70-130 <br /> Methyl tert-butyl ether 946 25 100 95 70-130 <br /> Surrogate a a a-Trifluorotoluene 112 100 112 60-140 <br /> Matnx Spike(2070256-MS1) Source 5207249-08 Prepared&Analyzed 07/25/02 <br /> Benzene 945 050 ug/l 100 ND 94 60-140 <br /> Toluene 104 050 100 ND 101 60-140 <br /> Ethylbenzene 103 050 100 ND 103 60-140 <br /> es(total) 315 050 300 ND 105 60-140 <br /> 1 tert-butyl ether 119 25 100 ND 106 60-140 <br /> Surrogate a a a-Trifluorotoluene 109 100 109 60-140 <br /> Matrix Spike Du (2070256-MSDI) Source S207249-08 Prepared&Analyzed 07/25/02 <br /> Benzene 101 050 ugA 100 ND 101 60-140 7 25 <br /> Toluene 11 1 050 100 ND 108 60-140 7 25 <br /> Ethylbenzene 109 050 100 ND 109 60-140 6 25 <br /> Xylenes(total) 334 050 300 ND 111 60-140 6 25 <br /> Methyl tent-butyl ether 132 25 100 ND 119 60-140 10 25 <br /> Surrogate a a a-Trri luorotoluene 107 100 107 60-140 <br /> Batch 2070270-EPA 5030B P <br /> Blank(2070270-BLK1) Prepared&Analyzed 07/26/02 <br /> Purgeable Hydrocarbons ND 50 ug/I <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Methyl Cert-butyl ether ND 25 " <br /> Surrogate a a a-Triuorotoluene 937 100 94 60-140 <br /> uoia Analytical-Sacramento The results to this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced to its entirety <br /> , Page 8 of 10 <br /> per <br /> `may <br />