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680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> Sequoia 404 N W1get Lane Walnut Creek.CA 94598 (925)988-9600 FAX(925)988-9673 <br /> Analytical 14 Striker Avenue Suite t 9 FAX Sacramento 95834 (916)922-9600 ( ) <br /> 921-0100 <br /> 2455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 (707)792-0342 <br /> T <br /> ettler Ryan/Geostrategles Client Project ID Unocal 0123, 2BOO47 85 <br /> 747 Sierra Court, Ste J <br /> ublin, CA 94568 Reported Aug 7 1998 <br /> ttent2on Deanna Harding QC Sample Group 9806E65 <br /> QUALITY CONTROL. DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8010/601 <br /> Analyst L Kim <br /> ANALYTE 1,1-DCE TCE Chlorobenzene <br /> QC Batch # GCO630980VOA09B <br /> Sample No 9806F20-01 <br /> Date Prepared 6/30198 6130198 6130198 <br /> Date Analyzed 6130198 6130198 6130198 <br /> instrument 1 D # gchpO9 gchp09 gchp09 <br /> Sample Conc , ug/L 20 N D N D <br /> Conc Spiked ug/L 25 25 25 <br /> Matrix Spoke ug/L 25 24 24 <br /> % Recovery 92 96 96 <br /> Matrix <br /> Spoke Duplicate uglL 23 23 23 <br /> % Recovery 84 92 92 <br /> Relative % Difference 9 1 43 43 <br /> RPD Control Limits 0-50 0-50 0-50 <br /> LCS Batch# BLK06309BBSA <br /> Date Prepared 6/30198 6130198 6/30198 <br /> Date Analyzed 6130198 6130198 6/30198 <br /> Instrument I D # gchpO9 gchpO9 gchp09 <br /> Conc Spoked ug/L 25 25 25 <br /> Recovery, ug/L 22 24 23 <br /> LCS °% Recovery 88 96 92 <br /> Percent Recovery Control Limits <br /> MS/MSD 65 135 70130 70130 <br /> LCS 65 135 70 130 70 130 <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 matnx 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 recover is to be used to validate the batch <br /> Tod Granicher <br /> Project Manager <br /> m <br />