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,—!D— Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 11 Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510) 988 9673 <br /> Analytical 819 Sinker Avenue Suite 8 Sacramento, CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> Touchstone Developments Client Project ID 8264-2, Chevron 9-8264 <br /> P 0 Box 2554 Matrix Solid <br /> Santa Rosa, CA 95405 <br /> Attention Jeff Monroe Work Order# 9511A10-01, 02 Reported Nov 27, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Total Recoverable <br /> Petroleum Nydrocarb <br /> QC Batch# 0P1115955520F_XA <br /> Analy Method SM 5520 EF MOD <br /> Prep Method EPA 3550 <br /> Analyst C Garde <br /> MS/MSD # 951161801 <br /> Sample Conc 1300 <br /> Prepared Date 11/15/95 <br /> Analyzed Date 11/16/95 <br /> Instrument I D # Manual <br /> Conc Spiked 500 mg/Kg <br /> Result 230 <br /> MS % Recovery 46 <br />. Dup Result 140 <br /> MSD % Recov 29 <br /> RPD 48 <br /> RPD Limit 0-50 <br /> LCS # BLK111595 <br /> Prepared Date 11/15/95 <br /> Analyzed Date 11/16/95 <br /> Instrument I D # Manual <br /> Conc Spiked 500 mg/Kg <br /> LCS Result 430 <br /> LCS % Recov 86 <br /> MS/MMS/MSD 60 140 <br /> LCS 70-110 <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 /> SE OIA 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 Cargasacchi <br /> Project Manager '*MS=Matrix Spice MSD=MS Duplicate, RPD=Relative% Difference 9511AIOTTT <7> <br />