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) i <br /> "' 680 Chesapeake Drive Redwood Ciry CA 94063 (650)364-9600 FAX(650)364-9233 <br /> Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (9Z5)988-9600 FAX(9Z5)988-9673 <br /> a- 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)92I-9600 FAX(916)9ZI-0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Gettler Ryan/Geostrategies Client Project ID Former Unocal Facility#5098 Y. n <br /> '6747 Sierra Court, Ste J Matrix Liquid <br /> -Dublin, CA 94568 <br /> Attention Deanna Harding Work Order# 9809909 01-10 Reported Oct 9, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Methanol Ethanol Iso-propanol <br /> QC Batch# GCO916981SHSHSB GCO916981SHSHSB GCO916981SHSHSB <br /> Analy Method iSHS iSHS ISHS <br /> Prep Method HS HS HS <br /> Analyst T Sorokin T Sorokin T Sorokin <br /> MS/MSD# 980974107 980974107 980974107 <br /> Sample Conc N D N D N D <br /> Prepared Date. 9/16/98 9/16/98 9/16/98 <br /> Analyzed Date 9/16/98 9/16/98 9/16/98 <br /> Instrument I D # GCV1 GCV1 GCV1 <br /> Conc Spiked 8 0 mg/L 8 0 mg/L 8 0 mg/L <br /> Result 71 7 9 8 4 <br /> MS % Recovery 89 99 105 <br /> Dup Result 68 79 83 <br /> 40MSD % RecoV 85 99 104 <br /> RPD 43 00 12 <br /> RPD Limit 0-50 0-50 0.50 <br /> LCS # LCS091698 LCS091698 LC8091698 <br /> Prepared Date 9/16/98 9/16/98 9/16/98 <br /> Analyzed Date 9/16/98 9/16/98 9/16/98 <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 67 72 75 <br /> LCS % RecoV 84 90 94 <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 /> SEQUOIA 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 /> 0the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference,the LGS recovery is to be used to validate the batch <br /> Tod Granicher <br /> Project Manager **MS=Matrix Spike,MSD-MS Duplicate,RPD=Relative%Difference 9809909 GET 41> <br /> r <br />