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• �� Sequoia 819 Striker Avenue,Suite 8 <br /> Sacramento, CA 95834 <br /> Analytical (916)921-9600 <br /> FAX(916)921-0100 <br /> EMCON-CP Project: ARCO 2186,Stockton,CA <br /> 3939 Cambridge Ave Sampled: 6/17/99 <br /> Project Number: 21775-237-002 Received: 6/18/99 <br /> Cameron Park,CA 95682 Project Manager: Mark Capps <br /> Reported: 7/1/99 <br /> Total Purgeable Hydrocarbons(e&C12);BTEX and MTBE by DHS LLTT/Quality Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov. RPD R=Notes�- <br /> Analyte Analyzed Level Result Result Units Recov.Limits % Limit <br /> Batch: 9060355 D-atc Prepared- 6/24/99 Extraction Method; FPA 5030B " O .) <br /> Blank 9060355-RIX1 <br /> Purgeable Hydrocarbons 6/24/99 ND mg/kg <br /> Benzene g g 1.00 <br /> Toluene <br /> ND 0.00500 <br /> Ethylbenzene ND 0.00500ND 0.00500 <br /> Xylenes(total) ND 0.00500 <br /> Methyl tert-butyl ether 00 <br /> D N 0.05 <br /> Surrogate: a,a,a-Trifluorotoluene 0.200 0. N 600.05 0 97.5 <br /> Ila 2060355-RSI <br /> Benzene 6/24/99 0.200 0.208 mg/kg 70.0-130 104 <br /> Toluene 0.200 0.224 70.0-130 112 <br /> Ethylbenzene 0.200 0.224 70.0-130 112 <br /> Xylenes(total) 0.600 0.600 0 <br /> 70.0-130 10 <br /> Methyl tert-butyl ether 0.200 0.198 70.0-130 100 <br /> Surrogate: is l <br /> a,a,a-Truorotoluene 0.200 0.206 <br /> 60.0-140 103 <br /> Matrix Spike 9060355 S906319-05 <br /> Benzene 6/24/99 0.200 ND 0.169 mg/kg 60.0-140 84.5 <br /> Toluene 0.200 ND 0.184 1. 60.0-140 92.0 <br /> Ethylbenzene 0.200 ND 0.186 " <br /> Xylenes(total) 60.0-140 93.0 <br /> 0.600 ND 0.516 60.0-140 86.0 <br /> Methyl tert-butyl ether 0.200 ND 0.178 " <br /> Surrogate. a,a,a-Trifluorotoluene 0.20060.0-140 89.0 <br /> 0.202 60.0-140 101 <br /> Matrix Spokc Dun 9060355-MyDI S206319-05 <br /> Benzene 6/24/99 0.200 ND 0.168 mg/kg 60.0-140 84.0 25.0 <br /> Toluene 0.200 ND 0.174 . . 0.593 <br /> 600-140 870 25.0 5.59 <br /> Ethylbenzene 0.200 ND 0.186 60.0-140 93.0 25.0 0 <br /> Xylenes(total) 0.600 ND 0.514 60.0-140 85.7 25.0 0.349 <br /> Methyl tert-butyl ether 0.200 ND 0.176 60.0-140 88.0 25.0 1.13 <br /> Surrogate: a,a,a-Trifluorotoluene 0.200 0.206 <br /> 60.0-140 103 <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions. <br /> Page 11 of 14 <br />