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680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(550)364-9233 <br /> g <br /> Sequoia 404 N Wiet Lane <br /> *V' Walnut Creels.CA 9459$ (925)988-9600 FAX(925)988-9673 <br /> Analytical $19 Striker Avenue Suitt$ Sacramento CA 95$34 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma C4 94954 (707)792-1865 FAX(707)792-0342 <br /> T <br /> ettler Ryan/Geostrategies Client Project 1D Unocal 0123, 280047 85 <br /> 747 Slerra Court, Ste J <br /> ublin, CA 94568ttention Deanna Harding OC Sample Group 9806E65 Reported Aug 7, 7998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8010/601 <br /> Analyst L Kim <br /> i <br /> ANALYTE 1,1-DCE TCE Chlorobenzene <br /> QC Batch # GC0701980VOA09B <br /> Sample No 9806G24-01 <br /> Date Prepared 711198 711!98 711198 <br /> Date Analyzed 712198 7!2198 712198 <br /> Instrument I D # gchp09 gchpO9 gchp09 <br /> Sample Conc ug/L N D N D N D <br /> Conc Spiked, ug/L 25 25 25 <br /> Matrix Spike, ug/L 20 23 23 <br /> % Recovery 80 92 92 <br /> Matrix <br /> Spike Duplicate, uglt 22 22 22 <br /> % Recovery 88 88 88 <br /> Relative % Difference 9 5 44 44 <br /> RPD Control Limits 0-50 0-50 0-50 <br /> LCS Batch# BLK070198BSA <br /> Date Prepared 711198 711198 711!98 <br /> Date Analyzed 711198 711198 711198 <br /> Instrument I D # gchpO9 gchp09 gchp09 <br /> Conc Spiked ug/L 25 25 25 <br /> Recovery, ug1L 22 23 23 <br /> LCS % Recovery 88 92 92 <br /> Percent Recovery Control Limits <br /> F- <br /> IVISIMS0 65135 70130 70130 <br /> LCS 65135 70130 70130 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <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 /> Tod Granicher <br /> Project Manager <br />