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Sequoia 680 Chesapeake Dnve Redwood c,ty 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 /> qiko Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921-0100 <br /> Touchstone Developments Client Project ID Chevron 9-8264/8264-1 h <br /> 6284 Stoneridge Mall Rd , B211 Matrix Solid <br /> Pleasanton, CA 94588 <br /> Attention Anne Marie Dockstader Work Order# 9511553-05 Reported Nov 14, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: 1,1-Dichloroethene Trichloroethene Benzene Toluene Chloro- <br /> benzene <br /> QC Batch# MS1106958240EXA MS1106958240ExA MS1106958240EXA MS110695a240EXA MS1106958240EXA <br /> Analy Method EPA 8240 EPA 8240 EPA 8240 EPA 8240 EPA 8240 <br /> Prep Method N/A N/A N/A N/A N/A <br /> Analyst: L Duong L Duong L Duong L Duong L.Duong <br /> MS/MSD#• 951134006 951134006 951134006 951134006 951134006 <br /> Sample Conc N D N D N D N D N D <br /> Prepared Date 11/6/95 11/6/95 11/6/95 11/6/95 11/6/95 <br /> Analyzed Date 11/6/95 11/6/95 11/6/95 11/6/95 11/6/95 <br /> Instrument I D.# F3 F3 F3 F3 F3 <br /> Cone Spiked 2500 pg/Kg 2500 ug/Kg 2500 pg/Kg 2500 pg/Kg 2500 pg/K9 <br /> Result: 2500 2500 2600 2500 2500 <br /> MS% Recovery* 100 100 104 100 100 <br />• Dup Result 2100 2300 2400 2300 2300 <br /> MSD % Recov. 84 92 96 92 92 <br /> RPD 17 83 80 83 83 <br /> RPD Limit: 0-50 0-50 0-50 0-50 0-50 <br /> LCS#. BLK110695 BLK110695 BLK110695 BLK110695 BLK110695 <br /> Prepared Date 11/6/95 11/6/95 11/6/95 11/6/95 11/6/95 <br /> Analyzed Date 11/6/95 11/6/95 11/6/95 11/6/95 11/6/95 <br /> Instrument I D # F3 F3 F3 F3 F3 <br /> Cone Spiked: 2500 Ng/Kg 2500 u9/Kg 2500 us/Kg 2500 Ng/Kg 2500 N9/Kg <br /> LCS Result: 3000 28W 3000 2900 2800 <br /> LCS % Recov. 120 112 120 116 112 <br /> LCS DL-234 71-157 37-151 47-150 37-160 <br /> Control Limits <br /> Please Note <br /> The LCS is a control sample of known,interferent-fres matrix that is analyzed using the same reagents, <br /> SEr7 ANALYTICAL 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 /> Mark J Cargasacchi '*MS=Matrix Spike,MSD=MS Duplicate,APD=Relative%Difference <br /> Project Manager 9511553 TTT <4, <br />