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ars � <br /> �y! <br /> Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 989-9600 FAX(510)988-9673 <br /> Analytical 819 Sinker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 %00 FAX(916)921-0100 <br /> ,Gettler Ryan/6e0strategles C11e6t Project ID Unocal 0123/10341Central Ave <br /> 6747 Sierra Court, Ste J Matrix Liquid <br /> `Dublin, CA 94568 <br /> Attention Deanna Harding w Work Order# 9803HO6-02-05 x Reported Apr 13, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte 1,1-Dichloro- Trichloro- Chlorc- <br /> ethene ethane Benzene <br /> QC Batch# GC032798801008A GCO32798801008A GG032798801008A <br /> Analy Method EPA 8010 EPA 8010 EPA 8010 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 <br /> Analyst E Cunanan E Cunanan E Cunanan <br /> MS/MSD # 9803F9301 9803F9301 98031F9301 <br /> Sample Conc N D N D N D <br /> Prepared Date 3/27/98 3/27/98 3/27/98 <br /> Analyzed Date. 3/27/98 3/27/98 3/27/98 <br /> Instrument l D #' GCHP8 GCHP8 GCHP8 <br /> Conc Spiked 125 pg/L 12 5 ug/L 12 5ug/L <br /> Result 12 12 11 <br /> MS % Recovery 96 96 88 <br /> Dup Result 11 11 11 <br /> MSD % Recov 88 88 88 <br /> RPD 87 87 00 <br /> RPD Limit 0-25 0-25 0-25 <br /> LCS # BLK033098 BLK033098 BLK033098 <br /> Prepared Date 3/30/98 3/30/98 3/30/98 <br /> Analyzed Date 3/30/98 3/30/98 3/30/98 <br /> Instrument I D # GCHP8 GCHP8 GCHP8 <br /> Conc Spiked 12 5 ug/L 12 5 pg/L 12 5 ug/L <br /> LCS Result. 12 12 11 <br /> LCS %Recov.. 96 96 88 <br /> 60-140 60-140 60-140 <br /> LCS 65-135 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 /> 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 /> egory **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference <br /> rolect Manager 9803H06GET ¢5> <br />