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( 819 Striker Avenue. Suite 8 <br /> {7 oia Sacramento,CA 95834 <br /> �•� <br /> Sequoia (9 t 6)921-9600 <br /> Analytical FAX(916)921-0100 <br /> EMCON1Pinnacle-Cameron Park Project: ARCO 2186,Stockton Sampled: 8/23/99 to 8126199 <br /> 3939 Cambridge Road,Ste, 220 Project Number: NIA Received: 8/27/99 <br /> Cameron Park,CA 95682 Project Manager: Mark Capps Reported: 9113199 <br /> Total Pu"rgeal le Hydrocarbons(C6=C12),UM and MTBE by DHS LUFT/Quality Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov. RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov. Limits % Limit % No <br /> Matrix Spike(continued) 9090004-MSl 5908353-06 <br /> Xylenes(total) 911199. 30.0 ND 26.5 ug/1 60.0-140 88.3 <br /> Methyl tert-butyl ether 10.0 ND 8.84 $ . <br /> Surrogate: a,a,a-Triuorololuene 10.0 8.75 b0.0-1.0-140 875 <br /> .5 <br /> Matrix Spike Dun 5908353-06 <br /> Benzene 911199 10.0 ND 8.30 ug/l 60.0-140 83.0 25.0 4.13 <br /> Toluene 10.0 ND 8.70 60.0-140 87.0 25.0 0.115 <br /> Ethylbenzene 10.0 ND 8.87 60.0-140 88.7 25.0 0.565 <br /> Xylenes(total) 30.0 ND 26.8 60.0-140 89.3 25.0 1.13 <br /> Methyl tert-butyl ether 10.0 ND 9.28 60.0-140 92.8 25.0 4.86 <br /> Surrogate: a,a,a-Trifluarotoluene <br /> 10.0 8.21 60.0-140 82.1 <br /> is Analytical-Sacramento *Refer to end of report for text of notes and definitions. <br /> SlWPage 15 of 18 <br />