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Sequoia 680 Ceeake Drive Redwood City. CA 94063 650) 364-9600 FAX (650) 364-9233 <br />404 N. Wiget lane Walnut Creek. CA 94598 (925) 988-9600 FAX (925) 988-9673 <br />Analytical 819 Striker Avenue, Suite 8 Sacramento, CA 95834 (916) 921-9600 FAX (916) 921-0100 <br />1455 McDowell Blvd. North, Ste. D Petaluma. CA 94954 (707) 792-1865 FAX (707) 792-0342 <br />... ............................... <br />Gettler-Ryan - Dublin Client Project ID: Chevron #9-3232, Stocktori <br />6747 Sierra Court, Suite J Matrix: Liquid <br />Dublin, CA 94568 <br />Attention: Greg Gurss QC Sample Group: 9031101-103 Reported: Mar 17, 19! <br />ANALYTE Benzene <br />Toluene Ethyl Xylenes MTBE <br />Batch#: <br />Benzene <br />Method: EPA 8020 <br />EPA 8020 EPA 8020 EPA 8020 EPA 8260 <br />Analyst: C. Westwater <br />C. Westwater C. Westwater C. Westwater N. Nelson <br />MS/MSD <br />2LCS031299 <br />Batch#: <br />9030604 <br />Date Prepared: <br />3/12/99 <br />Date Analyzed: <br />3/12/99 <br />Instrument I.D.#: <br />HP -2 <br />Conc. Spiked: <br />20Ng/L <br />Matrix Spike <br />20 Ng/L <br />% Recovery: <br />95 <br />Matrix Spike <br />105 <br />Duplicate % <br />Recovery: <br />80 <br />Relative % <br />Difference: <br />17 <br />LCS Batch#: <br />2LCS031299 <br />Date Prepared: <br />3/12/99 <br />Date Analyzed: <br />3/12/99 <br />Instrument I.D.#: <br />HP -2 <br />LCS % <br />HP -2 <br />Recovery: <br />100 <br />9030604 <br />9030604 <br />9030604 <br />3/12/99 <br />3/12/99 <br />3/12/99 <br />3/12/99 <br />3/12/99 <br />3/12/99 <br />HP -2 <br />HP -2 <br />HP -2 <br />20 Ng/L <br />20 Ng/L <br />60 pg/L <br />95 <br />100 <br />105 <br />75 <br />90 <br />95 <br />24 <br />11 <br />10 <br />2LCS031299 <br />2LCS031299 <br />2LCS031299 <br />3/12/99 <br />3/12/99 <br />3/12/99 <br />3/12/99 <br />3/12/99 <br />3/12/99 <br />HP -2 <br />HP -2 <br />HP -2 <br />95 100 108 <br />3/14/99 <br />3/14/99 <br />GC/MS-2 <br />50 pg/L <br />98 <br />98 <br />LCS031499 <br />3/14/99 <br />3/14/99 <br />GC/MS-2 <br />102 <br />Recovery <br />Control Limits: 70-130 70-130 70-130 70-130 70-130 <br />SEQUOIA ANALYTICAL, #1271 <br />JJlianne 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 />9031092.GET <29> <br />