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819 Striker Avenue Suite 8 <br /> Sequoia Sacramento C 95834 <br /> (916)921-9600!-9600 <br /> FAX(916)921-0 t 00 <br /> Analytical www sequolalabs com <br /> SECOR International-Rancho Cordova Project ARCO 595, Stockton,CA <br /> 3017 Kilgore Road,Suite 100 Project Number NIA [reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 08/08/01 18 06 <br /> Volatile Oxygenate Compounds by EPA Method 8260A - Quality Control <br /> Sequoia Analytical- Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> ateh 1080016-EPA 5030E JMeOH <br /> lank(1080016-BLKI) _ Prepared&Analyzed 08/02/01 <br /> Tert-butyl alcohol ND to mg/kg <br /> k-isopmpyl <br /> thyl tert-butyl ether ND 0 10 <br /> ether ND 0 10 " <br /> Ethyl tert-butyl ether ND 0 10 " <br /> Fthert-amyl methyl ether ND 0 10 <br /> anol ND ISO " <br /> 1,2-Dichloroethane ND 0 10 <br /> thylene dibromide ND 0 10 " <br /> arrogate 1 2-DCA-d4 278 250 111 60-140 <br /> LCS(1080016-SSI) __ Prepared&Analyzed 08/02/01 <br /> Wn-butyl ether 257 0 10 mg/kg 250 103 60-140 <br /> 1 2-DCA-d4 292 250 117 60-140 <br /> Atrix Spike(1080_0_16-MS1) Source 5107309-07 Prepared&Analyzed 08/02/01 <br /> ethyl ter(-butyl ether 2 50 010 mg/kg 250 ND 100 60-140 <br /> arrogate 1,2-PCA-d4 273 " 250 109 60-140 <br /> Wlatrix Spike Dup(1080016-MSD1) Source 5107309-07_ Prepared&Analyzed 08/02/01 — <br /> ethyl tert-butyl ether 260 0 10 mg/kg 250 ND 104 60-140 392 25 <br /> Surrogate 1,2-DCA-d4 277 250 111 60-140 <br /> 1 <br /> la Analytical- Sacramento The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br />' Page 14 of 15 <br />