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Ira �Er Sequoia 680 Chesapeake Drive Redwood City, CA 94063 (650) 364-9600 FAX(650)364 9233 <br /> 404 N Wig <br /> et 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 /> YL <br /> h Gettler Ryan/Geostrategles �hetit Project ED Unocal 0123/1034 Central AveY <br /> ,6747 Sierra Court, Ste J Matrix Liquid <br /> "Dublin, CA 94568 <br /> `Attention Deanna Harding Work Order# 9803H06-02, 03, 04 Reported Apr 13, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Total Oil&Grease <br /> QC Batch# SPO32698552000A <br /> Analy Method SM 5520E <br /> Prep Method SM 55208 <br /> Analyst P Cheung <br /> BS/BSD# BLK032698 <br /> Sample Cone N D <br /> Prepared Date 3/26/98 <br /> Analyzed Date 3/27/98 <br /> Instrument 1 D #. MANUAL <br /> Conc. Spliced 20 mg/L <br /> Result 17 <br /> BS % Recovery 85 <br /> Dup Result 17 <br /> BSD % Recov 85 <br /> RPD 00 <br /> RPD Limit 0-30 <br /> LCS # LCS032798 <br /> Prepared Date 3/27/98 <br /> Analyzed Date 3/30/98 <br /> Instrument I D # MANUAL <br /> Cone Spiked 20 mg/L <br /> LCS Result. 18 <br /> LCS % Recov 90 <br /> 60-140 <br /> LCS 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 /> SBQU 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 tf <br /> the recovery of analytes from the matrix spike does not fail within specified control limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> Gregory <br /> oject Manager **MS=Matrix Spike, MSD MS Duplicate, RPD=Relative%Difference 98031-106 GET 47> <br />