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'Q Sequoia <br />�,,,� Analytical <br />WCON/IT - Sacramento <br />1433 N Market Blvd , #1 <br />Sacramento, CA 95834 <br />Project ARCO 2168, Stockton, CA <br />Project Number 792229 <br />'rolect Manager Dave Foley <br />819 Striker Avenue Suite 8 <br />Sacramento CA 95834 <br />(9 t 6) 921-9600 <br />FAX (916) 9z 1 -0 100 <br />Sampled 12/17/99 <br />Received 12/20/99 <br />Reported 115/00 <br />Volatile Oxygenate Compounds by EPA Method 8260A/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 % Notes* <br />Batch 9120273 <br />Date Prepared 12/22/99 <br />Extraction Method EPA 5030E <br />[P/Tl <br />Blank <br />9120273-BLKI <br />- <br />Tert-butyl alcohol <br />12/22/99 <br />ND <br />ug/1 <br />200 <br />Methyl tent -butyl ether <br />ND <br />200 <br />Di -isopropyl ether <br />ND <br />200 <br />Ethyl tert-butyl ether <br />ND <br />" <br />200 <br />Tert-amyl methyl ether <br />ND <br />200 <br />Surrogate 1,2 -DCA -d4 <br />500 <br />546 <br />600-140 <br />109 <br />LCS <br />9120273 -BSI <br />Methyl tert-butyl ether <br />12/22/99 500 <br />556 <br />ug/1 <br />700-130 <br />111 <br />Surrogate 1,2 -DCA -d4 <br />" 500 <br />546 <br />600-140 <br />109 <br />LCS Dun <br />9120273-BSDI <br />Methyl tert-butyl ether <br />12/22/99 Soo <br />548 <br />ug/1 <br />700-130 <br />110 <br />250 0 905 <br />agate 1,2 -DCA -d4 <br />11 500 <br />566 <br />600-140 <br />113 <br />Matrix Spike <br />9120273 -MSI 5912171-06 <br />Methyl tent -butyl ether <br />12/22/99 500 172 <br />700 <br />ug/1 <br />600-140 <br />106 <br />Surrogate 1,2 -DCA -d4 <br />F, 500 <br />522 <br />600-140 <br />104 <br />_ <br />Matrix Spike Dup <br />9120273-MSD1 S912171-06 <br />Methyl tert-butyl ether <br />12/22/99 500 172 <br />716 <br />ug/1 <br />600-140 <br />109 <br />250 279 <br />Surrogate 12 -DCA -d4 <br />11 500 <br />548 <br />" <br />600-140 <br />110 <br />Batch 9120325 <br />Date Prepared 12/28/99 <br />Extraction <br />Method EPA <br />5030B <br />[P/T1 <br />Blank <br />9120325-BLKI <br />Tert-butyl alcohol <br />12/28/99 <br />ND <br />ugll <br />200 <br />Methyl tert-butyl ether <br />ND <br />200 <br />Di -isopropyl ether <br />ND <br />200 <br />Ethyl tert-butyl ether <br />ND <br />2 00 <br />Tert-amyl methyl ether <br />ND <br />2 00 <br />Surrogate 1 2 -DCA -d4 <br />500 <br />546 <br />600-140 <br />109 <br />Blank <br />9120325-BLK2 <br />Tert-butyl alcohol <br />12/29/99 <br />ND <br />ug/1 <br />200 <br />Methyl tert-butyl ether <br />ND <br />200 <br />Di -isopropyl ether <br />ND <br />200 <br />Ethyl tert-butyl ether <br />" <br />ND <br />200 <br />Tert-amyl methyl ether <br />ND <br />200 <br />a Ana►yuca[ - Sacramento <br />*Refer to end of report for text of notes and <br />Page 7 of 9 <br />lu <br />