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QUALITY CONTROL DATA REPORT <br />ANALYTE Benzene <br />Toluene Ethyl Xylenes Lead MTBE <br />Batch# <br />Benzene <br />T <br />Sequoia <br />680 Chesapeake Drive <br />404 N Wiget [ane <br />Redwood City CA 94063 <br />Walnut Creek. CA 94598 <br />(650) 364-9600 <br />(925) 988-9600 <br />FAX(650)364-9Z33 <br />FAX (925) 988-9673 <br />Analytical <br />819 Striker Avenue Suite 8 Sacramento CA 95834 <br />1455 McDowell Blvd North Ste D Petaluma. CA 94954 <br />(916) 921-9600 <br />(707) 791-1865 <br />FAX (916) 921-0100 <br />FAX (707) 792-0341 <br />Oettler-Ryan - Dublin <br />Client Project ID <br />Chevron #9-5775, Lodi <br />133 <br />Duplicate % <br />6747 Sierra Court, Suite J <br />Matrix <br />Solid <br />Relative % <br />Dublin, CA 94568 <br />29 <br />Attention Greg A Gurss <br />OC Sample Group <br />8082197-206 <br />Reported <br />Sep 1, 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 />5LCS082598 <br />Batch# <br />A8010072 <br />Date Prepared <br />8/25/98 <br />Date Analyzed <br />8/25/98 <br />Instrument I D # <br />HP -5 <br />Conc Spiked <br />0 80 mg/kg <br />Matrix Spike <br />0 80 mg/kg <br />% Recovery <br />120 <br />. Matrix Spike <br />133 <br />Duplicate % <br />GC/MS-2 <br />Recovery <br />90 <br />Relative % <br />Difference <br />29 <br />LCS Batch# <br />5LCS082598 <br />Date Prepared <br />8/25/98 <br />Date Analyzed <br />8/25/98 <br />Instrument I D # <br />HP -5 <br />LCS % <br />HP 5 <br />Recovery <br />96 <br />A8010072 <br />A8010072 <br />A8010072 <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 />0 80 mg/kg <br />0 80 mg/kg <br />2 4 mg/kg <br />125 <br />121 <br />133 <br />93 <br />91 <br />30 <br />28 <br />96 <br />33 <br />8082209 <br />8/25/98 <br />8/26/98 <br />MV -1 <br />50 mg/kg <br />86 <br />8082194 <br />8/25/98 <br />8/26/98 <br />GC/MS 2 <br />1300 ug/kg <br />108 <br />80 <br />115 <br />72 <br />69 <br />5LCS082598 <br />5LCS082598 <br />5LCS082598 <br />LCSDO82598 <br />LCS082598 <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 />98 98 100 86 123 <br />Recovery <br />Control Limits 50-150 50-150 50-150 50-150 80-120 65-135 <br />SEQUOIA ANALYTICAL, #1271 <br />�i Lti �­'sA4 <br />6 <br />ulianneFe le <br />g Y <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 />r <br />8082197 GET <14> <br />