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680 Chesapeake Drive Redwood Gty CA 94063 (650) 3649600 <br />Sequoia 404 N WISet Lane Walnut Creek CA 94598 (925) 988-9600 <br />819 Stnker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 <br />Analytical <br />1455 McDowell Road <br />North Ste D Petaluma CA 94954 (707) 792 1865 <br />(., 1551 Industrial Road San Carlos CA 94070-4111 (650} 232 9600 <br />ler-Ryan - Dublin Client Project ID Chevron #9-5775, Lodi <br />6747 Sierra Court, Suite J Matrix Solid <br />Dublin CA 94568 <br />FAX(650)364-9233 <br />FAX (925) 988-9673 <br />FAX (916) 921-0100 <br />FAX (707) 792-034Z <br />FAX (650) Z32-961 Z <br />Attention Barbara Sleminski QC Sample Group 9020044-094 Reported Feb 10, 1999 <br />QUALITY CONTROL DATA REPORT <br />ANALYTE Benzene <br />Toluene Ethyl Xylenes <br />2/4/99 <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 />Date Prepared <br />Date Analyzed <br />Instrument I D # <br />Conc Spiked <br />Matrix Spike <br />% Recovery <br />Matrix Spike <br />Duplicate % <br />Recovery <br />Relative % <br />Difference <br />LCS Batch# <br />Date Prepared <br />Date Analyzed <br />Instrument I D # <br />LCS % <br />Recovery <br />9020426 <br />2/4/99 <br />2/4/99 <br />HP 4 <br />0 80 mg/kg <br />96 <br />405 <br />87 <br />4LCS020499 <br />2/4/99 <br />2/4/99 <br />HP -4 <br />96 <br />902.0426 <br />2/4/99 <br />2/4/99 <br />HP -4 <br />0 80 mg/kg <br />9020426 <br />9020426 <br />2/4/99 <br />2/4/99 <br />2/4/99 <br />2/4/99 <br />HP -4 <br />HP 4 <br />0 80 mg/kg <br />2 4 mg/kg <br />84 <br />86 <br />96 <br />91 <br />93 <br />108 <br />86 <br />70 <br />12 <br />4LCS020499 <br />2/4/99 <br />2/4/99 <br />HP -4 <br />83 <br />4LCS020499 <br />4LCS020499 <br />2/4/99 <br />2/4/99 <br />2/4/99 <br />2/4/99 <br />HP 4 <br />HP 4 <br />85 96 <br />Recovery <br />Control Limits 50-150 50-150 50-150 50-150 <br />S QIJOIA ANALYTICAL, #1271 <br />Iianne 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 />r92� <br />9020044 GET < 11 > <br />