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680 Chesapeake Dnve Redwood City,CA 94063 (650) 364 9600 rAX(650)364 9133 <br /> Sequoia <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento, CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> x} u r ♦u yr•ry y v, , ♦ r r.r rOr i <br /> vrrl.v xvhe r}u ry.�w r�, trt ryr.r }� i r � <br /> 2.Gettler Ryan/Geostrategies Client Project ID Chevron 9-1848, Manteca �r <br /> '3164 Gold Camp Drive, #240 Matrix Liquid <br /> `=`,Rancho Cordova, CA 95670 Reported Sep 11, 1997` <br /> Attention Greg Gurss Work Order# 9708G33-09-121>6 <br /> h P ;< <br /> rr K A <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Methanol Ethanol iso-Propanol <br /> QC Batch# GCO904971SHSHSA GCO904971SHSHSA GCO904971SHSHSA 1 <br /> Analy Method' ISHS ISHS ISHS i <br /> Prep Method. HS Hs HS <br /> Analyst' T Tran T Tran T Tran <br /> MS/MSD #. 970SE7601 970SE7601 9708E7601 <br /> Sample Conc N D N D N D <br /> Prepared Date' 9/4/97 9/4/97 9/4/97 <br /> Analyzed Date 9/4/97 9/4/97 9/4/97 <br /> Instrument I D # GCV1 GCV1 GCV1 <br /> Conc Spiked* 8 0 mg/L 8 0 mg/L 8 0 mg/L <br /> Result 77 88 90 <br /> �MS %Recovery, 96 110 113 <br /> Dup Result 84 90 93 <br /> MSD % Recov. 105 113 116 <br /> RPD 87 22 33 <br /> RPD Limit' 0-50 0-50 0-50 <br /> �a rSr r i nr r n r r <br /> LCS #' BLK090497 BLK090497 BLK090497 <br /> Prepared Date* 9/4/97 9/4/97 9/4/97 <br /> Analyzed Date 9/4/97 9/4/97 9/4/97 <br /> instrument 1 D #* GCV1 GCV1 GCV1 <br /> Conc Spiked 8 0 mg/L 8 0 mg/L 8 0 mg/L <br /> LCS Result 78 84 81 <br /> LCS % Recov. 98 105 101 <br /> 50-150 50-150 50-150 <br /> LCS 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 is analyzed using the same reagents, <br /> �" 0001 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 /> Gregory <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative%Difference 9708G33 GET <6> <br />