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Sequoia 819 Avenue 8 <br /> Sacramento <br /> 958mento CA 95834 <br /> (916)921-9600 <br /> Analytical www w (916)sequoilabs aiab5 c 00 <br /> com <br /> [Rancho <br /> OR International-Rancho Cordova Project ARCO 2133,Stockton,CA Sampled 9/27100 <br /> Kilgore R. <br /> Suite 100 Project Number N/A Received 9127/00 <br /> Cordova,CA 95670 Project Manager RusLy Benkosky Reported 10/2/00 <br /> Total Purgeable Hydrocarbons(C6-Cl2), BTEX and MTBE in Air by DHS LOFT/Quality Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Rccov RPD RPD <br /> [Analyte Analyzed Level Result Result Units Recov Limits % Limit % Not <br /> Batch 0090331 Date Prepared 9/29/00 Extraction Method EPA 5030B(Me0YJ <br /> Blank 0090331-BLK1 <br /> Purgeable Hydrocarbons 9/29/00 ND mg/m'Air 100 <br /> Benzene ND 00500 <br /> Toluene ND 00500 <br /> Ethylbenzene ND 00500 <br /> Xylenes(total) ND 00500 <br /> Methyl tert-butyl ether _ ND 0 500 <br /> Surrogate a a a-Trifluorotoluene 2 00 224 600-140 112 <br /> LCS 0090331-BSI <br /> Benzene 9/29/00 200 2 05 mg/m'Air 700-130 102 <br /> Toluene 200 2 02 700-130 101 <br /> Elftenzene 200 2 10 700-130 105 <br /> Xs(total) 600 626 700-130 104 <br /> Methyl tert-butyl ether 2 00 2 23 700-130 112 <br /> Surrogate a a a-Triuorotoluene 2 00 2 17 600-140 109 <br /> LCS Dun 0090331-BSD1 <br /> Benzene 9129/00 2 00 2 07 mg/m'Air 700-130 103 250 0 976 <br /> Toluene 2 00 204 700-130 102 25 0 0 985 <br /> Ethylbenzene 2 00 211 700-130 105 25 0 0 <br /> Xylenes(total) 6 00 6 32 700-130 105 250 0 957 <br /> _Methyl tert-butyl ether 2 00 245 700-130 123 250 _936 <br /> Surrogate Aa,a-Tr fluorotoluene 2 00 214 600-140 107 <br /> 0 <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions <br /> Page 4 of 6 <br />