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, <br /> Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 <br /> Sequoia 404 <br /> N wlget Lane Walnut Creek,CA 94598 (925)98$-9600 FAX(925)988-9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 {916}921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Gettler RyanlGeostrategies Client Project ID Unocal 0123, 280047 85 <br /> 6747 Sierra Court Suite J <br /> Dublin, CA 94568 Reported Aug 4, 1998 <br /> Attention Deanna Harding QC Sample Group 9806E65 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8015A <br /> Analyst A PORTER <br /> ANALYTE Diesel <br /> QC Batch # GCO625980HBPEXZ <br /> Sample No 9806D71-1 <br /> Data Prepared 6125198 <br /> Date Analyzed 6127198 <br /> Instrument I D # GCHP58 <br /> Sample Conc , ug1L N D <br /> Conc Spiked ug1L 1000 <br /> Matrix Spike ug1L 750 <br /> % Recovery 75 <br />. Matrix <br /> Spike Duplicate ug1L 790 <br /> % Recovery 79 <br /> Relative % Difference 5 2 <br /> RPD Control Limits 0-50 <br /> LCS Batch# BLK062598ZS <br /> Date Prepared 6125198 <br /> Date Analyzed 6127198 <br /> Instrument 1 D # GCHP5B <br /> Conc Spiked uglL 1000 <br /> Recovery, uglL 680 <br /> LCS % Recovery 68 <br /> Percent Recovery Control Limits <br /> IVISlMS0 50150 <br /> LCS 60 140 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> Ffortified <br /> e <br /> S is a control sample of known interferent free matrix that s analyzed using the same reagents <br /> SEQUOIA ANALYTICAL and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> ith known quantities of specific compounds and subjected to the entire analytical procedure Ifry of analytes from the matrix spike does not fait 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 />