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4 C� <br /> f) fAX(658)3FAX 925 fi4-9233 <br /> 684 Chesapeake Drive Redwood City CA 94063 (650) 344-9600 988-9673 <br /> 1 Sequoia 444 N \Eget Lane Walnut Creek,CA 94598 1925)988"9600 { ) <br /> Analytical 14 Striker Avenue SuN t Sacramento CA 95834 (707)792-865 FAX <br /> X(707)792-09042 <br /> 1455 McDowell Blvd North Ste D [etaluma CA 94954 ( ) <br /> Gettler RyanlGeastrategles Client Project ID Unocal 0123, 280047 85 <br /> 6747 Sierra Court Suite J <br /> Dublin, CA 94568 Reported Aug 4, 1998 <br /> Avention Deanna Harding QC Sample Group g806E65 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8015A <br /> Analyst A PORTER <br /> ANALYTE Diesel <br /> QC Batch # GC0706980HBPEXB SG <br /> Sample No 9806157-7 SG <br /> Date Prepared 716198 <br /> Date Analyzed 717198 <br /> Instrument I D # GCHP4B <br /> Sample Cone , ug/L N D <br /> Cone Spiked ug/L 1000 <br /> Matrix Spike ug/L 600 <br /> % Recovery 60 <br />. Matrix <br /> Spike Duplicate uglL 680 <br /> % Recovery 68 <br /> Relative % Difference 12 <br /> RPD Control Limits 0-50 <br /> LCS Batch# BLK070698BS <br /> Date Prepared 716198 <br /> Date Analyzed 717198 <br /> Instrument 1 D # GCHP48 <br /> Cone Spiked ug/L 1000 <br /> Recovery, ug/L 590 <br /> LCS % Recovery 59 <br /> Percent Recovery Control Limits <br /> MSIMSD 40140 <br /> LCS 40 140 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> Please Note <br /> The LCS s 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 ermre analytical procedure If <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> mterferance the LCS recovery is to be used to validate the batch <br /> Tod Granicher <br /> Project Manager <br /> (r� <br />