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680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> Sequoia 404 N VYiget lane Walnut Creek CA 94598 (925)988-9600 FAX(92S)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(9t6)921-0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342 <br /> i <br /> Gettler Ryan/Geostrategies Client Project ID Unocal 2859, 280054 <br /> 6747 Sierra Court, Ste J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding Work Order# 9809003 01-10 Reported Nov 23, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# VSTD100K VSTD100K VST0100K VSTD100K <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method <br /> Analyst N A N A N A N A <br /> MS/MSD # <br /> Sample Conc <br /> Prepared Date <br /> Analyzed Date <br /> Instrument 1 D # <br /> Conc Spiked <br /> Result <br /> i'V1S % Recovery <br /> Dup Result <br /> MSD % Recov <br /> RPD <br /> RFD Limit <br /> LCS # LCS090498 LCS090498 LCS090498 LCS090498 <br /> Prepared Date 9/4/98 9/4/98 9/4/98 9/4/98 <br /> Analyzed Date 9/4/98 9/4/98 9/4/98 9/4/98 <br /> Instrument I D # NA NA N A NA <br /> Conc Spiked 100V9/L 100,ug/L 100 pg/L 300 pg/L <br /> LCS Result 93 97 95 290 <br /> LCS % Recov 93 97 95 97 <br /> LCS 84-116 81-117 79-115 80-114 <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 /> EQUOIA ANALYTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> ELAP #2245 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 /> Tod Granlcher <br /> Project Manager "*MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative%Difference 9809003 GET <3> <br />