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` Sequoia <br />�111� Analytical <br />680 Chesapeake Drive Redwood City CA 94063 <br />404 N Wlget Lane Walnut Creek CA 94598 <br />819 Striker Avenue Suite 8 Sacramento, CA 95834 <br />1455 McDowell Blvd North Ste D Petaluma, CA 94954 <br />(650) 364-9600 <br />(925) 988-9600 <br />(916) 921-9600 <br />(707) 792-1865 <br />FAX(650)364-9233 <br />FAX(925)988-9673 <br />FAX (916) 921-014D <br />FAX (707) 792-0342 <br />I <br />�ettler-Ryan - Dublin <br />Client Project ID <br />Chevron #9-5775, Lodi <br />benzene <br />Method <br />6747 Sierra Court, Suite J <br />Matrix <br />Solid <br />Analyst <br />P Kosovskaya <br />Dublin, CA 94568 <br />P Kosovskaya T Le T Le N Nelson N Nelson <br />Matrix Spike <br />8/28/98 <br />Duplicate % <br />Attention Greg A Gurss <br />CC Sample Group <br />8082208-221 <br />Reported <br />Sep 1, 1996 <br />QUALITY CONTROL DATA REPORT <br />ANALYTE <br />1,1-Dichloro- <br />Trichloro <br />Chloro- Lead Lead MTBE MTBE <br />Date Prepared <br />ethene <br />ethene <br />benzene <br />Method <br />EPA 8010 <br />EPA 8010 <br />EPA 8010 EPA 7420 EPA 7420 EPA 8260 EPA 6260 <br />Analyst <br />P Kosovskaya <br />P Kosovskaya <br />P Kosovskaya T Le T Le N Nelson N Nelson <br />MS/MSD <br />LCS082598 <br />Batch# <br />8082221 <br />Date Prepared <br />8/25/98 <br />Date Analyzed <br />8/28/98 <br />Instrument I D # <br />HP -6 <br />Conc Spiked <br />200 ug/kg <br />Matrix Spike <br />8/28/98 <br />% Recovery <br />125 <br />Matrix Spike <br />8/28/98 <br />Duplicate % <br />HP -6 <br />Recovery <br />105 <br />Relative % <br />GC/MS-2 <br />Difference <br />17 <br />LCS Batch# <br />LCS082598 <br />Date Prepared <br />8/25/98 <br />Date Analyzed <br />8/25/98 <br />Instrument I/�D # <br />HP -6 <br />LITS % <br />8/25/98 <br />Recovery <br />so <br />8082221 <br />8082221 <br />8082208 <br />8082208 <br />8082194 <br />8082218 <br />8/25/98 <br />8/25/98 <br />8/25/98 <br />8/25/98 <br />8/25/98 <br />8/25/98 <br />8/28/98 <br />8/28/98 <br />8/26/98 <br />8/26/98 <br />8/26/98 <br />8/28/98 <br />HP 6 <br />HP -6 <br />MV 1 <br />MV -1 <br />GC/MS-2 <br />GC/MS-2 <br />200 }ig/kg <br />200 ug/kg <br />50 mg/kg <br />50 mg/kg <br />1300 ug/kg <br />1300 ug/kg <br />95 <br />90 <br />80 <br />86 <br />108 <br />108 <br />80 80 82 80 115 115 <br />17 12 25 72 69 69 <br />LCS082598 <br />LCS082598 <br />LCS082598 <br />LCS0082598 <br />LCS082598 <br />LCS0825986 <br />8/25/98 <br />8/25/98 <br />8/25/98 <br />8/25/98 <br />8/25/98 <br />8/25/98 <br />8/25/98 <br />8/25/98 <br />8/26/98 <br />8/26/98 <br />8/26/98 <br />8/28/98 <br />HP 6 <br />HP -6 <br />MV 1 <br />MV -1 <br />GC/MS-2 <br />GC/MS-2 <br />70 <br />75 <br />84 <br />86 <br />123 <br />115 <br />% Recovery <br />Control Limits 65 135 70-130 70-130 80 120 80-120 65-135 65-135 <br />SEQUOIA ANALYTICAL,j, #1271 <br />V*V" �J <br />Ilanne Fegley <br />Project Manager <br />Please Note <br />The LCS is a control sample of known, interferent free matrix that is analyzed using the same reagents <br />preparation, and analytical methods employed for the samples The matrix spike is an aliquot of sample <br />fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br />the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br />interference, the LCS recovery is to be used to validate the batch <br />r9;� <br />8082208 GET <35> <br />