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W <br /> Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> Ci) 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Stnker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Blame Tech Services, Inc Client Project ID Chevron 9-8264 <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thle Work Order # 9802909-01 Reported Feb 27, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte 11-Dichloro- Trichloro- Chloro- <br /> ethane ethane Benzene <br /> QC Batch# GCO218988010096 GCO21898801009B GCO218988010096 <br /> Analy Method EPA 8010 EPA 8010 EPA 8010 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 <br /> Analyst M McLachlan M McLachlan M McLachlan <br /> MS/MSD # 980258901 980258901 980258901 <br /> Sample Cone N D N D N D <br /> Prepared Date 2/18/98 2/18/98 2/18/98 <br /> Analyzed Date 2/18/98 2/18/98 2/18/98 <br /> Instrument l D # GCHP9 GCHP9 GCHP9 <br /> Cone Spiked 25 ug/L 25 yg/L 25,ug/L <br /> Result 28 24 26 <br /> MS % Recovery 112 96 104 <br /> 0 <br /> Dup Result 26 24 26 <br /> MSD % Recov 104 96 104 <br /> RPD 74 00 00 <br /> RPD Limit 0-25 0-25 0-25 <br /> LCS # BLK021998 BLK021996 BLK021998 <br /> Prepared Date 2/19/98 2/19/98 2/19/98 <br /> Analyzed Date 2/19/98 2/19/98 2/19/98 <br /> Instrument I D # GCHP9 GCHP9 GCHP9 <br /> Cone Spiked 25 ug/L 25 ug/L 25 jig/L <br /> LCS Result 24 23 25 <br /> LCS % Recov 96 92 100 <br /> 60140 60-140 60-140 <br /> LCS 65-135 70-130 70130 <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 /> Q QI AN LYTICAL 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 /> eg P nner _.MS=Matrix Spike, MSD=MS Duplicate RPD=Relative%Difference <br /> roJ ct Manager 9802909 BLA <10> <br />