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680 Ch-apeake Drive Redwood Ci -9600 FAX(65 01 364-9233 <br /> Sequoia CA 94 (650) 364 <br /> (D 404 11 Wige,Un, Walnut Creek, CA 94599 (510) 988-9600 FAX(510)988-9673 <br /> — <br /> Analytical819 Striker Avenue,Suite a Sacramento, CA 95834 (916) 921-9600 FAX (916)921-0100 <br /> Maine Tech Services, inc <br /> Hent Project 10: Chevron 9-4054 980210-D1 <br /> .1680 Rogers Ave. Matrix: Liquid <br /> :"..'San Jose, CA 95112 <br /> Attention Fran Thie Work Order # 9602716 -01, 05 Reported: Mar 5, 1998`. <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> OC Batch#: GCO2.2298802007A GCO22998802007A GCO22298802007A GC0512298802007A GCO22296802007A <br /> Analy. Method: EPA 8020 EPA 8020 EPA 3020 EPA 8020 EPA 8015M <br /> Prep. Method: EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> 1 <br /> Analyst: S.L. S.L S.L. S.L $.L <br /> MS/MSD #: 98020510 98020510 98020510 98020510 <br /> Sample Conc.: 16 2.4 1.4 6.2 <br /> Prepared Date: 2/21/98 2/21/98 2/21/98 2/21/98 <br /> Analyzed Date: 2/21/98 2/21/98 2/21/98 2/21/98 <br /> Instrument I.D.#: GC7 GC7 GC7 GC7 <br /> Conc. Spiked: 20lig/L 20 pg/L 20 sig/L 60 pg/L <br /> Result: 36 23.4 23.7 76.4 <br /> MS % Recovery: 100 105 112 117 <br /> Dup. Result- 31.5 20.2 20.5 67.5 <br /> MSD % Recov.: 78 89 96 102 <br /> RPD: 13 15 14 12 <br /> RPD Limit: 0-25 0-25 0-25 0-25 <br /> e................ ................ . <br /> .............. <br /> LCS #: LCS022298 LCS022298 LCS022298 LCS022-298 LCS022298 <br /> Prepared Date: 2122/98 2/22/98 2/22/98 <br /> 2/22/98 2/22/98 hAnalyzed Date: 2/22/98 2/22/98 2/22/98 2/22/98 2/22/98 <br /> Instrument I.D.#: GC7 GC7 GC7 GC7 GC7 <br /> Conc. Spiked: 20 jig/L 20.Mg/L 20,ug/L 60 jug/L 500,ug/L <br /> LCS Result: 20.2 20.2 19.5 63.6 489 <br /> LCS % Recov.: 101 101 98 106 98 <br /> MS/MSD 60-140 60-140 60-140 60-140 60-140 <br /> LCS 70-130 70-130 70-130 70-130 70-130 <br /> Control Limits <br /> Please Note: <br /> SEQUOIA ANALYTICAL The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> Elap#2142 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 /> (- <br /> g ginner <br /> J <br /> roject Manager MS=Matrix Spike,MSD=MS Duplicate,RPOaFtelative%Difference 9802716.81-A <1> <br /> 7t,�P <br />