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Sequoia fiSO Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX (650) 364-9233 <br />404 N Wlget Lane Walnut Creek CA 94598 (925) 988-9600 FAX (925) 988-9673 <br />819 Striker Avenue Suite 8 Sacramento, CA 95834 (916) 921-9600 FAX (916) 921-0100 <br />a -) <br />Analytical 1455 McDowell Blvd North Ste D Petaluma, CA 94954 (707) 792 1865 FAX (707) 792-0342 <br />tattler-Ayan - Dublin Client Project ID Chevron #9-5775, Lodi <br />6747 Sierra Court, Suite J Matrix Solid <br />Dublin, CA 94568 <br />Attention Greg A Gurss QC Sample Group 808-2195 Reported 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 />80B2205 <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 />Conic 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 />8/25/98 <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 />LCS % <br />Recovery <br />95 <br />100 <br />100 <br />104 <br />oecovery <br />Control Ljmits 50-150 50-150 50-150 50 150 <br />SEQUOIA ANALYTICAL, #1271 <br />Jifhanne 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 />8082195 GET <4> <br />