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Sequoia <br />fi�ll>� Analytical <br />6,,oChesapeake Drive Redwood CityCA 44063 <br />404 N Wiget Lane Walnut Creek. CA 94548 <br />819 Striker Avenue Suite $ 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(9Z5)988-9673 <br />FAX (916) 921-0100 <br />FAX (707) 792 0342 <br />IR ettler-Ryan - Dublin <br />-747 Sierra Court, Suite J <br />Client project Ib Chevron #9-5775, Lodi <br />Matrix Solid <br />Analyst C Westwater <br />C Westwater C Westwater C Westwater T Le N Nelson <br />Dublin, CA 94568 <br />Attention Greg A Gurss <br />OC Sample Group 808-2194 <br />Reported <br />Aug 26, 1998 <br />QUALITY CONTROL DATA REPORT <br />ANALYTE Benzene <br />Toluene Ethyl Xylenes Lead MTBE <br />Batch# <br />Benzene <br />Method EPA 8020 <br />EPA 8020 EPA 8020 EPA 8020 EPA 7420 EPA 8260 <br />Analyst C Westwater <br />C Westwater C Westwater C Westwater T Le N Nelson <br />MS/MSD <br />5LC8082598 <br />Batch# <br />A8010072 <br />Date Prepared <br />8/25/98 <br />Date Analyzed <br />8/25/98 <br />Instrument 1 D # <br />HP -5 <br />Conc Spiked <br />0 80 mg/kg <br />Matrix Spike <br />8/26/98 <br />% Recovery <br />120 <br />Matrix Spike <br />HP -5 <br />Duplicate % <br />GC/MS-2 <br />Recovery <br />90 <br />Relative % <br />50 mg/kg <br />Difference <br />29 <br />LCS Batch# <br />5LC8082598 <br />Date Prepared <br />8/25/98 <br />Date Analyzed <br />8/25/98 <br />Instrument I D # <br />HP -5 <br />LCS % <br />8/25/98 <br />Recovery <br />96 <br />A8010072 <br />A8010072 <br />A8010072 <br />8082209 <br />8082194 <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 />HP -5 <br />HP -5 <br />HP -5 <br />MV -1 <br />GC/MS-2 <br />0 80 mg/kg <br />0 80 mg/kg <br />2 4 mg/kg <br />50 mg/kg <br />1300 ug/kg <br />125 <br />121 <br />133 <br />86 <br />108 <br />93 <br />91 <br />96 <br />80 <br />115 <br />30 <br />28 <br />33 <br />72 <br />69 <br />5LCS082598 <br />5LCS082598 <br />5LCS082598 <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 />HP -5 <br />HP -5 <br />HP -5 <br />98 98 100 <br />LCSDO82598 LCS082598 <br />8/25/98 <br />8/25/98 <br />8/26/98 <br />8/26/98 <br />MV -1 <br />GC/MS 2 <br />86 <br />123 <br />ecovery <br />Control Limits 50-150 50-150 50-150 50-150 80-120 65 135 <br />SEQUOIA ANALYTICAL, #1271 <br />1k"1J/Q->-% <br />Julianne 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 It <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 />8082194 GET <4> <br />