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Sequoia <br />1-5)— <br />680 Chesapeake Drive <br />404 N Wiget Lane <br />Redwood City CA 94063 <br />Walnut Creek. CA 94598 <br />(650) 364-9600 <br />(925) 988-9600 <br />FAX (650) 364-9233 <br />fAX (925) 988-9673 <br />qW 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) 792-1865 <br />FAX (916) 921-0100 <br />FAX (707) 792-0342 <br />0ettler-Ryan - Dublin <br />Client Project ID <br />Chevron #9-5775, Lodi <br />8/25/98 <br />8/25/98 <br />6747 Sierra Court, Suite J <br />Matrix <br />Solid <br />8/25/98 <br />8/25/98 <br />Dublin, CA 94568 <br />Instrument I D # <br />HP -4 <br />HP -4 <br />HP -4 <br />Attention Greg A Gurss <br />QC Sample Group <br />8082197-206 <br />Reported <br />Sep 1, 1998 <br />QUALITY CONTROL DATA REPORT <br />ANALYTE Benzene <br />Toluene Ethyl Xylenes <br />Benzene <br />Method EPA 8020 <br />EPA 8020 EPA 8020 EPA 8020 <br />Analyst D Newcomb <br />D Newcomb D Newcomb D Newcomb <br />MS/MSD <br />Batch# <br />8082205 <br />8082205 <br />8082205 <br />8082205 <br />Date Prepared <br />8/25/98 <br />8/25/98 <br />8/25/98 <br />8/25/98 <br />Date Analyzed <br />8/25/98 <br />8/25/98 <br />8/25/98 <br />8/25/98 <br />Instrument I D # <br />HP -4 <br />HP -4 <br />HP -4 <br />HP -4 <br />Conc Spiked <br />0 80 mg/kg <br />0 80 mg/kg <br />0 80 mg/kg <br />2 4 mg/kg <br />Matrix Spike <br />% Recovery <br />90 <br />94 <br />94 <br />100 <br />Matrix Spike <br />Duplicate % <br />Recovery <br />90 <br />94 <br />94 <br />100 <br />Relative % <br />Difference <br />00 <br />00 <br />00 <br />00 <br />LCS Batch# <br />4LCS082598 <br />4LCS082598 <br />4LCS082598 <br />4LCS082598 <br />Date Prepared <br />8/25/98 <br />8/25/98 <br />8/25/96 <br />8/25/98 <br />Date Analyzed, <br />8/25/98 <br />8/25/98 <br />8/25/98 <br />8/25/98 <br />Instrument I D # <br />HP -4 <br />HP 4 <br />HP 4 <br />HP -4 <br />LCS % <br />Recovery <br />95 <br />100 <br />100 <br />104 <br />% Recovery <br />Control Limits 50-150 50-150 50-150 50-150 <br />SEQUOIA LANALYTICAL, <br />#1271 <br />Jl-ZL� <br />anne FeLgy <br />Project Manager <br />Please Note <br />The LCS is a control sample of known, interferent free matrix that 1s 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 />8082197 GET <15> <br />