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ID <br /> Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wtget Lane Walnut Creek CA 94598 (510) 988 9600 FAX (510)988 9673 <br /> ill Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Touchstone Developments Client Project ID ' Chevr=on 9-2033, 2033-2 <br /> P O Box 2554 Matrix Solid <br /> Santa Rosa, CA 95405 <br /> Attention Jeff Monroe Work Order# 9610180 01 Reported Nov 5, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte 1,1-Dichloroethene Trichloroethene Benzene Toluene Chloro- <br /> benzene <br /> QC Batch# MS1029968240EXA MS1029968240EXA MS1029968240EXA MS1029968240EXA MS1029968240EXA <br /> Analy Method. EPA 8240 EPA 8240 EPA 8240 EPA 8240 EPA 8240 <br /> Prep Method <br /> Analyst L Zhu L Zhu L Zhu L Zhu L Zhu <br /> MS/MSD# 9610G5101 961OG5101 961OG5101 9610(35101 961065101 <br /> Sample Cone N D 760 N D N D N D <br /> Prepared Date 10/29/96 10/29/96 10/29/96 10/29/96 10/29/96 <br /> Analyzed Date 10/29/96 10/29/96 10/29/96 10/29/96 10/29/96 <br /> Instrument 1.13 # F3 F3 F3 F3 F3 <br /> Cone Spiked 2500 fag/Kg 2500 fug/Kg 2500 fug/Kg 2500,ug/Kg 2500 fug/Kg <br /> Result 2100 3000 2400 2200 2300 <br /> �S % Recovery 84 90 96 88 92 <br /> D u p Result 2100 3300 2400 2300 2300 <br /> MSD % Recov : 84 102 96 92 92 <br /> RPD 00 95 00 44 00 <br /> RPD Limit 0-25 0-25 0.25 0-25 0-25 <br /> LCS # VB110196 VB110196 VB110196 VB110196 VB110196 <br /> Prepared Date 11/1/96 10/29/96 10/29/96 10/29/96 10/29/96 <br /> Analyzed Date 11/1/96 10/29/96 10/29/96 10/29/96 10/29/96 <br /> Instrument I D #- F2 F2 F2 F2 F2 <br /> Cone Spiked 2500 fug/Kg 2500 fig/Kg 2500 fug/Kg 2500 fig/Kg 2500 fug/Kg <br /> LCS Result. 2000 2300 2600 2500 2500 <br /> LCS % Recov 80 92 104 100 100 <br /> 60.140 60-140 60-140 60-140 60-140 <br /> LCS 65-135 70-130 70-130 70-130 70-130 <br /> Control Limits <br /> Please Note <br /> The LCS is a control sample of known,interferent-free matrix that;s analyzed using the same reagents, <br /> �QU IA 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 /> evin Follett **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative% Difference <br /> Project Manager 9610180 TTT <1> <br />