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Seu®la <br />680 Ch ake Drive <br />Redwood City, CA 94063 <br />50) 364-9600 <br />FAX(650)364-9233 <br />a-)404 <br />N. Wiget Lane <br />Walnut Creek, CA 94598 <br />(925) 988-9600 <br />FAX(925)988-9673 <br />Analytical <br />wo1455 <br />819 Striker Avenue, Suite 8 <br />McDowell Blvd. North, Ste. D <br />Sacramento, CA 95834 <br />Petaluma, CA 94954 <br />(916) 921-9600 <br />(707) 792-1865 <br />FAX (916) 921-0100 <br />FAX (707) 792-0342 <br />uemer-rtyan - UuDlln <br />6747 Sierra Court, Suite J <br />Dublin, CA 94568 <br />Attention: Greg Gurss <br />Matrix: Solid <br />QC Sample Group: 9031092-104 <br />Reported: Mar 17, 1 <br />ANALYTE Benzene <br />Toluene Ethyl Xylenes <br />3/15/99 <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 />Batch#: 9031114 9031114 9031114 9031114 <br />Date Prepared: <br />3/15/99 <br />3/15/99 <br />3/15/99 <br />3/15/99 <br />Date Analyzed: <br />3/15/99 <br />3/15/99 <br />3/15/99 <br />3/15/99 <br />Instrument I.D.#: <br />HP -4 <br />HP -4 <br />HP -4 <br />HP -4 <br />Conc. 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 />103 <br />90 <br />94 <br />104 <br />Matrix Spike <br />Duplicate % <br />Recovery: <br />101 <br />89 <br />91 <br />104 <br />Relative % <br />Difference: <br />1.2 <br />1.4 <br />2.7 <br />010 <br />LCS Batch#: <br />4LCS031599 <br />4LCS031599 <br />4LCS031599 <br />4LCS031599 <br />Date Prepared: <br />3/15/99 <br />3/15/99 <br />3/15/99 <br />3/15/99 <br />Date Analyzed: <br />3/15/99 <br />3/15/99 <br />3/15/99 <br />3/15/99 <br />Instrument I.D.#: <br />HP -4 <br />HP -4 <br />HP -4 <br />HP -4 <br />LCS % <br />Recovery: <br />91 <br />79 <br />85 <br />96 <br />Recovery <br />Control Limits: 50-150 50-150 50-150 50-150 <br />SEQUOIA ANALYTICAL, #1271 <br />r <br />lianne 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 <26> <br />