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�� 90t1 N WiLane <br /> equo Walnut Creek CA 99598 <br /> (925)9888-9600 <br /> Analytical www <br /> (925)988-9673 <br /> sequolalabs corn <br /> Secor-Rancho Cordova Project Arco <br /> 3017 Ki[gore Rd,Ste #100 Project Number Arco#595, Stockton Reported <br /> Rancho Cordova CA,95670 Project Manager Clint Harms 07-Aug-01 13 12 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Walnut Creek <br /> Reporting Spike Source %R-EC RPD <br /> nalyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1G27018-EPA 5030B(MeOH) <br /> tI-Buan It(IC27018-BLK1) Prepared 26-Jul-01 Analyzed 27-Jul-01 <br /> tyl <br /> alcohol ---- ND -- 25 mg/kg �---- ------ - -- ---------------- T <br /> Methyl tert-butyl ether ND 020 " <br /> 1i-isopropyl ether ND 010 <br /> 1thyl tert-butyl ether ND 010 " <br /> tert-Amyl methyl ether ND 010 <br /> 2-Dichloroethane ND 010 " <br /> ,2-Dibromoethane ND 020 " <br /> Surrogate Dibromofluoromethane 2 39 250 95 6 50-150 -� <br /> furrogate 12-Dichloroethane-d4 233 250 932 50-150 <br /> lank(IG27018-BLK2) Prepared 26-Jul-01 Analyzed 28-Jul-01 <br /> tert-Butyl alcohol - _ND 25 -mg/kg- -- - - - - — ---- - --- <br /> rt-butyl ether ND 020 <br /> rl*pyl ether ND 010 " <br /> Ethyl tert-butyl ether ND 010 <br /> rt-Amyl methyl ether ND 010 <br /> ,2-Dichloroethane ND 010 " <br /> ,2-Dibromoethane ND 020 " <br /> urrogate Dibromo luoromelhane 233 2 50 932 50-150 <br /> urrogate 12-Dichloroethane-d4 252 250 101 50-150 <br /> Blank(1G27018-BLK3) Prepared 31-Jul-01 Analyzed 01-Aug-01 <br /> C'tanol NU 25mfg-Butyl alcohol ND 25thyl tort-butyl ether ND 020 " <br /> i-isopropyl ether ND 010 " <br /> thyl tett-butyl ether ND 010 " <br /> rt-Amyl methyl ether ND 010 " <br /> 1,2-Dichloroethane ND 010 " <br /> t,2-Dibromoethane - -- --------- - ND- --- 0 20-- „- --- -- - - - -- --- - <br /> urrogate Dtbromofluoromelhane 237 2 50 948 50-I50 <br /> Surrogate 12-Dichloroethane-d4 237 250 948 50-150 <br /> E <br /> equoia Analytical - Walnut Creek The resulls 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 /> I <br /> Page 12 of 15 <br />