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Sequoia 610 Cheupeake Drive Redwood Qty.CA 94063 (413) 164.9600 FAX(413) 364.9231 <br /> Analytical 1900 elver Avenue,Suite L Concord,CA 94520 (310) 686.9600 FAX(5 to)686.9619 <br /> 119 Striker Avenue,Suite a Sacramento, CA 95134 (916) 921.9600 FAX 19to 921•oloo <br /> Alton Geosclence Cllent Project.ID: Mobil 04-343/30-0136-15 <br /> 30-A Lindbergh Ave. Matrix: Liquid <br /> Livermore, CA 94550 <br /> Attention: Kevin Keenan QC Sample Group: 4070910-921 Reported: Jul 27, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> WXYTE Benzene Toluene Ethyl Xylenes Diesel <br /> Benzene <br /> i <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 81715 Mod <br /> Analyst: J. Fontecha J.Fontecha J.Fontecha J.Fontecha K.Wimer <br /> MS/MSD <br /> Batch#: 4070680 4070680 4070680 4070680 BLK072094 <br /> t <br /> Date Prepared; 7 25 94 7/25/94 7 25 94 7/25/94 7 24 94 <br /> / / / II I <br /> Date Analyzed: 7/25/94 7/25/94 7/25/94 7/25/94 7/24/94 <br /> Instrument I.D,#: HP-4 HP4 HP-4 HP-4 HP-3B <br /> Conc. Spiked: 20yg/L 20Mg/L 20Fig/L 60P9/L 300pg/L <br /> Matrix Spike <br /> %Recovery: 90 90 90 93 78 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 90 go g0 92 89 <br /> Relative% <br /> Difference: 0.0 0.0 0.0 1.1 13 <br /> LCS Batch#: 2LCS072594 2LCS072694 2LCS072594 2LC8072594 BLK072094 <br /> Date Prepared: 7/25/94 7/25/94 7/25/94 7/25/94 7/24/94 <br /> Date Analyzed: 7/25/94 7/25/94 7/25/94 7/25/94 7/24/94 <br /> Instrument I.D.#: HP-4 HP-4 HP-4 HP-4 HP-3B <br /> LCS% <br /> Recovery: 90 93 95 97 78 <br /> Recovery <br /> Control Limits: 71-133 72-128 72-130 71-120 28-122 <br /> Please Note; <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> SEQUOIA AN ICAL, #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 /> ren L Enstrom interference,the LCS recovery is to be used to validate the batch. <br /> Project Manager <br /> 4070910.ALT ¢5> <br />