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Sequoia 680 Chesapeake Drive Redwood City, CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N W3gct 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 /> {rGettler�iyan/Geostrategles Client Project ID '�Chevron'9-1918 Stockton <br /> }}r <br /> t 6747 Sierra Court, Ste G Matrix Solid <br /> ,Dublin, CA 94568 <br /> 'Attention Barbara Sieminski Work Order# 9704942-01 Reported May 2, 1997. <br /> v t . <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Gas <br /> QC Batch# GC041897BTEXEXA <br /> Analy Method EPA 8015M <br /> Prep Method 5030 <br /> Analyst Heider <br /> MS/MSD # 9704575-01 <br /> Sample Conc N D <br /> Prepared Date 4/18/97 <br /> Analyzed Date 4/18/97 <br /> Instrument I D # GCHP-07 <br /> Conc. Spiked 1 2 mg/kg <br /> Result 11 <br /> 4S % Recovery 92 <br /> Dup Result 11 <br /> MSD % Recov 92 <br /> RPD 00 <br /> RPD Limit 0-50 <br /> LCS # BLK041897 <br /> Prepared Date 4/17/97 <br /> Analyzed Date 4/17/97 <br /> Instrument I D # GCHP-07 <br /> Conc. Spiked 1 2 mg/kg <br /> LCS Result 1 3 <br /> LCS % Recov 108 <br /> 60-140 <br /> LCS 70-130 <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 /> {FOIA A ALYTICAL 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 /> MI regory <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative%Difference 9704942 GET <2> <br />