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• 680 Chesapeake Drive Redwood City,CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> VB ® ® Sequoia 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 /> VQVGettler Ryan/G eostrateg I es Client Project ID Unocal 6981, 785522 <br /> < 3164 Gold Camp Drive, #240 Matrix Liquid <br /> Rancho Cordova, CA 95670 <br /> Attention Steve Carter Work Order# 9712694-01, 02, 08, 09 Reported Dec 22, 1997` <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Methanol Ethanol iso-Propanol <br /> QC Batch# GC1215971SHSHSA GC1215971SHSHSA GC1215971SHSHSA <br /> Analy Method ISHS ISHS ISHS <br /> Prep Method HS HS HS <br /> Analyst T Tran T Tran T Tran <br /> MS/MSD # 971247701 971247701 971247701 <br /> Sample Conc N D N D N D <br /> Prepared Date 12/15/97 12/15/97 12/15/97 <br /> Analyzed Date 12/15/97 12/15/97 12/15/97 <br /> Instrument I D # GCv1 GCv1 GCv1 <br /> Conc. Spiked 8 0 mg/L 8 0 mg/L 8 0 mg/L <br /> Result 64 69 68 <br /> �S % Recovery 80 86 85 <br /> Dup Result 78 83 84 <br /> MSD % Recov 98 104 105 <br /> RPD 20 18 21 <br /> RPD Limit 0-50 0-50 0-50 <br /> LCS # BLK121597 BLK121597 BLK121597 <br /> Prepared Date 12/15/97 12/15/97 12/15/97 <br /> Analyzed Date 12/18/97 12/18/97 12/18/97 <br /> Instrument I D # GCv1 GCv1 GCv1 <br /> Conc. Spiked 8 0 mg/L 8 0 mg/L 8 0 mg/L <br /> LCS Result 71 73 74 <br /> LCS %Recov 89 91 93 <br /> 50-150 50-150 50-150 <br /> LCS 50-150 50-150 50-150 <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 /> 4FQUOIA 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 /> A egory <br /> oject Manager *`MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative%Difference 9712694 GET <3> <br />