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Sequoia $19 Sinker Avenue Suite <br /> Sacramento CA 95$344 <br /> (9[6)921-9600 <br /> FAX Analytical www equolalabs0co0m <br /> Stratus Environmental Project. ARCO 2168,Stockton,CA <br /> 3330 Cameron Park Drive,Ste 550 Project Number 2168, Stockton,CA Reported <br /> Cameron Park CA,95682 Project Manager Jay Johnson 06/21/02 12 28 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical- Sacramento <br /> Reportme Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2060166-EPA 5030B [P/T1 <br /> Blank(2060166-BLKl) Prepared&Analyzed 06/14/02 <br /> Tert-butyl alcohol ND 50 ugll <br /> Methyl tert-butyl ether ND 050 " <br /> Di-isopropyl ether ND 050 " <br /> }ethyl tent-butyl ether ND 050 " <br /> Tert-amyl methyl ether ND 050 " <br /> Ethanol ND 50 " <br /> 1,2-Dichloroethane ND 050 " <br /> Surrogate 12-DCA-d4 280 250 112 60-140 <br /> LCS(2060166-BSI) Prepared&Analyzed 06/14/02 <br /> ethyl tert-butyl ether 521 050 ug/l 545 96 60-140 <br /> -gate 12-DCA-d4 278 250 111 60-140 <br /> Matrix Spike(2060166-MSI) Source S206169-03 Prepared&Analyzed 06/14/02 <br /> Methyl tert-butyl ether 545 050 ug/l 545 ND 100 60-140 <br /> Surrogate 12-DCA-d4 293 " 250 117 60-140 4 <br /> Matrix Spike Dup(2060166-MSD1) Source 5206169-03 Prepared&Analyzed 06/14/02 <br /> Methyl tent-butyl ether 559 050 ug/l 545 ND 103 60-140 3 25 <br /> Surrogate 12-DCA-d4 299 — 250 T- — 120 60-140 -- <br /> Quota Analytical- Sacramento The results in this report apply to the samples analyzed to accordance with the chain of <br /> custody document This analytical report must be rep?oduced in its entirety <br /> Page 9 of I0 <br />