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IRf u, r <br /> • G80 Chesapeake Drive Redwood4 <br /> City CA 94063 (650)364-9600 FAX(650)369233 <br /> Sequoia 404 N Wiget Lane Walnut Creek CA 94598 {925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 4D. <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707) 792-0342 <br /> 1551 Industrial Road ' San Carlos CA 94070-4111 (650)232-96W FAX(650)232-9612 <br /> Gettler-Ryan -Dublin Client Project ID Tosco$8#6981, Stockton <br /> 6747 Sierra Court, Suite J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding OC Sample Group9041854-868 _ -- , Reported Y May.-11.4_1 999 <br /> QUALITY CONTROL DATA REPORT �> _ <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst J Minkel J Minkel J Minkel J-Minkel <br /> MS/MSD <br /> Batch# 9041762 9041762 9041762 9041762 <br /> Date Prepared 4/28/99 4/28/99 4/28/99 4/28/99 <br /> Date Analyzed 4/28/99 4/28/99 4/28/99 4/28/99 <br /> Instrument I D # HP-2 HP 2 HP-2 HP 2 <br /> Conc Spiked 20u9/L 20ug/L 20yg/L 60ug/L <br /> Matrix Spike <br /> % Recovery 95 90 90 98 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 90 85 85 95 <br /> Relative % <br /> Difference 54 5 7 5 7 34 <br /> LCS Batch# 2LCSO42899 2LCSO42899 2LCSO42899 2LCSO42899 <br /> Date Prepared 4/28/99 4/28/99 4/28/99 4/28/99 <br /> Date Analyzed 4/28/99 4/28/99 4/28/99 4/28/99 r <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 <br /> LCS % <br /> Recovery 95 90 95 102 <br /> ecovery - <br /> Control Limits 70-130 70-130 70-130 70-130 <br /> - Please Note , <br /> The LCS is a control sample of known,interferent free matrix that is analyzed,using the same reagents, <br /> SEQUOIA ANALYTICAL, #1271 preparation,and analytical methods employed for the samples The matrix spike ie aJ aliquot of sample <br />> fortified with known quantities of specific compounds and subjected to the enter®anafytical procedure If <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix ' <br /> r1 interference,the LCS recovery Is to be used to validate the batch _ Y <br /> rUllanne Fegley _ <br /> Protect Manager <br /> 9041854 GET -c18> <br /> r� <br />