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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wigct Lane Walnut Creek,CA 94598 (510) 988 9600 FAX(510)968 9673 <br /> war Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> 'Gettler�Ryan/Geostrategies Client Project ID Chevrort'9-1918, Stockton ` <br /> ,6747 Sierra Court, Ste G Matrix Solid <br /> }Dublin, CA 94568 <br /> ,Attention Barbara Sleminski Work Order# 9704942 -01 Reported May 2, 1997 x <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GC041897BTEXEXA GC041897BTEXEXA GC041897BTEXEXA GC041897BTEXEXA <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method 5030 5030 5030 5030 <br /> Analyst Helder Helder Helder Heider <br /> MS/MSD # 9704575-01 9704575-01 9704575-01 9704575 01 <br /> Sample Conc 0 010 0 010 N D 0 010 <br /> Prepared Date 4/18/97 4/18/97 4/18/97 4/18/87 <br /> Analyzed Date 4/18/97 4/18/97 4/18/97 4/18/97 <br /> Instrument I D # GCH>07 GCHP 07 GCHP-07 GCHP-07 <br /> Conc Spiked 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg <br /> Result 015 0 17 0 19 056 <br /> % Recovery 70 80 95 92 <br /> ❑up Result 016 017 019 056 <br /> MSD % Recov 75 80 95 92 <br /> RPD 65 00 00 00 <br /> RPD Limit 050 0-50 0-50 0-50 <br /> LCS # BLK041897 OLK041897 BLK041897 BLK041897 <br /> Prepared Date 4/17/97 4/17/97 4/17/97 4/17/97 <br /> Analyzed Date 4/17/97 4/17/97 4/17/97 4/17/97 <br /> Instrument I D # GCHP-07 GCHP 07 GCHP-07 GCHP-07 <br /> Conc Spiked 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg <br /> LCS Result 018 020 021 065 <br /> LCS % Recov 90 100 105 108 <br /> NIS M D 60-140 60-140 60-140 60-140 <br /> LCS 70130 70-130 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 /> OQUOIA 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 1s to be used to validate the batch <br /> ry <br /> I rego <br /> Project Manager "`MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9704942 GET t1> <br />