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0680 Chesapeake Drive <br />Sequoia 404 N Wiget Lane <br />819 Stnker Avenue Suite 8 <br />Analytical 1455 McDowell Blvd North Ste D <br />1551 Industrial Road <br />Redwood City CA 94063 <br />Walnut Creek CA 94598 <br />Sacramento CA 95834 <br />Petaluma CA 94954 <br />San Carlos CA 94070-4111 <br />(650) 364-9600 <br />(925) 988-9600 <br />(916) 921-9600 <br />(707) 792 9865 <br />(650) 232 9600 <br />FAX (650) 3649233 <br />FAX (925) 988-9673 <br />FAX (916) 921 -0 100 <br />FAX (707) 792-0342 <br />FAX (650) 232-96t2 <br />Ottler-Ryan - Dublin Client Project ID Chevron #9-5775, Lodi <br />EPA 8020 EPA 8020 EPA 8020 <br />Analyst C Westwater <br />6747 Sierra Court, Suite J Matrix Solid <br />9020076 <br />9020076 <br />Date prepared <br />Dublin, CA 94568 <br />Attention Barbara Siemmsk9 QC Sample Group 9020044-094 <br />2/5/99 <br />Reported <br />Feb 10, 1999 <br />QUALITY CONTROL DATA REPORT <br />ANALYTE Benzene <br />Toluene Ethyl Xylenes <br />4LCS020599 <br />Benzene <br />Method EPA 8020 <br />EPA 8020 EPA 8020 EPA 8020 <br />Analyst C Westwater <br />C Westwater C Westwater C Westwater <br />MS/MSD <br />4LCS020599 <br />4LCS020599 <br />4LCS020599 <br />4LCS020599 <br />Batch# <br />9020076 <br />9020076 <br />9020076 <br />9020076 <br />Date prepared <br />2/5/99 <br />2/5/99 <br />2/5/99 <br />2/5/99 <br />Date Analyzed <br />2/5/99 <br />2/5/99 <br />2/5/99 <br />2/5/99 <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 />105 <br />93 <br />96 <br />108 <br />is <br />Matrix Spike <br />Duplicate % <br />Recovery <br />113 <br />99 <br />101 <br />113 <br />Relative % <br />Difference <br />6 9 <br />6 5 <br />51 <br />38 <br />LCS Batch# <br />4LCS020599 <br />4LCS020599 <br />4LCS020599 <br />4LCS020599 <br />Date Prepared <br />2/5/99 <br />2/5/99 <br />2/5/99 <br />2/5/99 <br />Date Analyzed <br />2/5/99 <br />2/5/99 <br />2/5/99 <br />2/5/99 <br />Instrument I D # <br />HP -4 <br />HP -4 <br />HP 4 <br />HP -4 <br />LCS % <br />Recovery <br />96 <br />83 <br />86 <br />96 <br />Recovery <br />Control Limits 50-150 50-150 50.150 50-150 <br />IQUOTA ANALYTICAL, #1271 <br />anne Fegley <br />Project Manager <br />I <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 H <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 valldate the batch <br />9020044 GET <13> <br />