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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 Sum 8 Sacramento CA 95834 (916) 911 9600 FAX(916) 921 0100 <br /> Touchstone Developments Client Project ID Chevron 9-8264/8264-1 <br /> 6280 Stoneridge Mall Rd , 8211 Matrix Solid <br /> Pleasanton, CA 94588 <br /> Attention Anne Marie Dockstader Work Order# 9511587-17 Reported Nov 16, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte 11-Dlchloro- Trichloro- Chloro- <br /> ethene ethene benzene <br /> OC Batch# GC1106958010EXA GC1106958010FXA GC1106958010EXA <br /> Analy Method EPA 8010 EPA 8010 EPA 8010 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 <br /> Analyst A Li A L3 A Li <br /> MS/MSD # 951OK2301 951OK2301 951OK2301 <br /> Sample Conc N D 67 N D <br /> Prepared Date 11/6/95 11/6/95 11/6/95 <br /> Analyzed Date 11/7/95 11/7/95 11/7/95 <br /> Instrument I D # GCHP8 GCHP8 GCHP8 <br /> Conc Spiked 25ug/Kg 25pg/Kg 25ug/Kg <br /> Result 26 112 27 <br /> MS % Recovery 104 180 108 <br /> aDup Result 31 117 34 <br /> MSD % Recov 124 200 136 <br /> RPD 18 44 23 <br /> RPD Limit 0-50 0-50 0-50 <br /> LCS # BLK100795 BLK100795 BLK100795 <br /> Prepared Date 11/6/95 11/6/95 11/6/95 <br /> Analyzed Date 11/7/95 11/7/95 11/7/95 <br /> Instrument I D # GCHP8 GCHP8 GCHP8 <br /> Conc Spiked 25frg/Kg 25ug/Kg 25ug/Kg <br /> LCS Result 27 26 24 <br /> LCS % Recov 108 104 96 <br /> MS/MSD <br /> LCS 28-167 35-146 38-150 <br /> Control Limits <br /> Please Note <br /> The LCS 1s a control sample of known,interferent-free matrix that is analyzed using the same reagents <br /> SEG OIA ANALYTICAL preparation,and analytical methods employed for the samples The matrix spike 1s an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure It <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 /> Mark Aidargasacchi MS=Matrix Spike, MSD=MS Duplicate,RPO=Relative%Difference <br /> Project Manager 9511587M <s> <br />