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Sequoia <br />680 Chesapeake Drive <br />Redwood City CA 94063 <br />(650) 364-%00 <br />FAX (650) 364-9233 <br />(i)Analytical <br />404 N Wiget Lane <br />Walnut Creek. CA 94598 <br />(925) 988-9600 <br />FAX (9Z5) 988-9673 <br />IQF <br />819 Striker Avenue Suite <br />1455 McDowell Blvd North <br />S Sacramento CA 95834 <br />Ste D Petaluma, CA 94954 <br />(916) 921-9600 <br />(707) 792-1865 <br />FAX (916) 921-Of00 <br />FAX(707)792-0342 <br />#ler-Ryan - Dublin <br />Client Project ID <br />Chevron #9-5775, Lodi <br />20 ug/L <br />60 pg/L <br />7 Sierra Court, Suite J <br />Matrix <br />Liquid <br />108 <br />Dublin, CA 94568 <br />Attention Barbara Sieminskl <br />QC Sample Group <br />9020622-626 <br />Reported <br />Feb 24, 1999 <br />QUALITY CONTROL DATA REPORT <br />ANALYTE Benzene <br />Toluene Ethyl Xylenes <br />9020757 <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 1134. <br />LCS % <br />Recovery <br />9020757 <br />9020757 <br />9020757 <br />9020757 <br />2/17/99 <br />2/17/99 <br />2/17/99 <br />2/17/99 <br />2/17/99 <br />2/17/99 <br />2/17/99 <br />2/17/99 <br />HP -2 <br />HP -2 <br />HP -2 <br />HP 2 <br />20 ug/L <br />20 erg/L <br />20 ug/L <br />60 pg/L <br />100 <br />95 <br />100 <br />108 <br />95 <br />90 <br />95 <br />103 <br />51 <br />54 <br />51 <br />47 <br />2LCS021799 <br />2LCS021799 <br />2LCS021799 <br />2LCS021799 <br />2/17/99 <br />2/17/99 <br />2/17/99 <br />2/17/99 <br />2/17/99 <br />2/17/99 <br />2/17/99 <br />2/17/99 <br />HP -2 <br />HP -2 <br />HP -2 <br />HP -2 <br />100 <br />95 <br />95 <br />105 <br />Recovery <br />Control Limits 70-130 70-130 70-130 70.130 <br />EQUOIA ANALYTICAL, #1271 <br />Jutil Fegley <br />Project Manager <br />Please Note <br />The LCS is a control sample of known. Interferent free matrix that Is analyzed using 1h 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 spoke does not fall within specified control limits due to matrix <br />Interference, the LCS recovery is to be used to validate the batch <br />902-0622.GET <2> <br />