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Sequoia 610 Chesapeake Drive Redwood City,CA 94069 (415) 364.9600 FAX(4 15) 364.9333 <br /> 404 N.Wiaet Lane Walnut Creek.CA 94591 (510) 9811.9600 FAX(510)918.9673 <br /> Analytical 819 Striker Avenue,Suite a Sacramento,CA 95834 (916) 921-9600 FAX(916)921.0100 <br /> Alton Geosclence Client Project ID: Mobil #04-343,Tracy <br /> 30-A Lindbergh Ave. Matrix: Llquld <br /> Livermore, CA 94550 <br /> Attention: A. LeMay CC Sample Group: 5102080-090 Reported: Nov 3, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC 13atch#: GC103095 GC103095 GC103095 GC103095 <br /> 802009E 8020098 8020098 802009B <br /> Analy. Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep. Method: EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst: M.Creusere M.Creusere M.Creusere M.Creusere <br /> MS/MSD #: 5102081 5102081 5102081 5102081 <br /> Sample Conc.- N.D. N.D. N.D. N.D. <br /> Prepared Date: 10/30/95 10/30/95 10/30/95 10/30/95 <br /> Analyzed Date: 10/30/95 10/30/95 10/30/95 10/30/95 <br /> Instrument I.D.#: HP-9 HP-9 HP-9 HP-9 <br /> Conc. Spiked: 20pg/L 20yg/L 20yg/L 150 mg/L <br /> Result: 21 21 20 65 <br /> MS %Recovery: 105 105 100 108 <br /> Dup. Result: 20 20 20 65 <br /> MSD%Recov.: 100 100 100 108 <br /> RPD: 4.9 4.9 0.0 0.0 <br /> RPD Limit: 0.20 0-20 ago 0-20 <br /> LCS#: 4LCS103095 4LCS103095 4LCS103MS 4LCS103095 <br /> Prepared Date: 10/30/95 10/30/95 10/30/95 10/30/95 <br /> Analyzed Date: 10/30/95 10/30/95 10/30/95 10/30/95 <br /> Instrument I.D.#: HP-9 HP-9 HP-9 HP-9 <br /> Conc. Spiked: 20yg/L 20pg/L 20pg/L 60pg/L <br /> LCS Result: 18 is 1s so <br /> LCS % Recov.: 92 90 91 99 <br /> LCS 71-133 72-128 72-130 71-120 <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, M <br /> X the recovery of analytes from the matrix spike does not fall withir,specified control iirrtits due to matrix <br /> Interference,the LCS recovery Is to be used to validate the batch. <br /> Kevin Van Slarnbrook •*M =Matrix Spike,M D=MS Duplicate,RPD=Relative% 'tterence <br /> Project Manager <br /> 5102080.ALT <6> <br />