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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364-9600 FAX(415) 364.9233 <br /> 404 N.Wiget Lane Walnut Creek.CA 94598 (510) 988-9600 FAX(510)988-9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,G4 95834 (916) 921-9600 FAX(916)921.0100 <br /> 0lfon Geosclence' Clientproject 1D: Mobil #04-343 <br /> 10-A Lindbergh Ave. Matrix: Liquid <br /> Livermore, CA 94550 I <br /> Attention: Ailsa LeMay OC Sample Group- 6041156-6041166 Reported: May 3, 1996: <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: Benzene Toluene Ethyl Xylenes Diesel <br /> Benzene <br /> QC Batch#: 00042396 GCO42396 GCO42396 GC-042396 SP041695 <br /> 802011A 802011A 802011A 802011A 8015EXB <br /> Analy. Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015 Mod. <br /> Prep. Method: EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 3510 <br /> Analyst: L.Huang L Huang L Huang L.Huang J.Dinsay <br /> MS/MSD#: 6041211 6041211 6041211 6041211 BLK041696 <br /> Sample Conc.: N.D. N.D. N.D. N.D. N.D. <br /> Prepared Date: 4/23/96 4/23/96 4/23/96 4/23/96 4/16/96 <br /> Analyzed Date: 4/23/96 4/23/96 4/23/96 4/23/96 4/17/96 <br /> Instrument I.D.#: HP-11 HP-11 HP-11 HP-11 HP-3B <br /> Conc. Spiked: 20pg/L 20Ng/L 20lrg/L 60pg/L 300 pg/L <br /> Result: 24 21 23 67 270 <br /> MS%Recovery: 120 105 115 112 90 <br /> Dup. Result: 24 21 23 67 260 <br /> MSD %Recov.: 120 105 115 112 87 <br /> RPD: 0.0 0.0 0.0 0.0 3.8 <br /> RPD Limit: 0-20 0-20 0-20 0-20 0-50 <br /> LCS#: 11LCSO42396 11LCS042396 11LCSO42396 11LCS042396 LCSO41696 <br /> Prepared Date: 4/23/96 4/23/96 4/23/96 4/23/96 4/16/96 <br /> Analyzed Date: 4/23/96 4/23/96 4/23/96 4/23/96 4/17/96 <br /> Instrument I.D.#: HP-11 HP-11 HP-11 HP-11 HP-313 <br /> Conc. Spiked: 20pg/L 20pg/L 20pg/L 60pg/L 300 pg/L <br /> LCS Result: 21 18 20 61 260 <br /> LCS % Recov.: 105 90 100 102 87 <br /> LCS 70-130 70130 70-130 70-130 50-150 <br /> Control Limits <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 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 recoveris to be used to validate the batch. <br /> Kevin Van Slambrook **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative% Difference <br /> Project Manager <br /> 6041156-ALT <6> <br />