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rV' 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650) 364-9233 <br /> Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (9Z5)988-9600 FAX(925)988-9673 <br /> Analytical 819 Sinker Avenue Suite 8 Sacramento CA 95834 (916)92t-9600 FAX(9E6)921-010 0 <br /> 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342 <br /> FAttention <br /> sociates, Inc Client Project ID Westrec Proper/KIR 62514 0001 <br /> ne Palm Avenue <br /> , CA 95351-1502 <br /> Jeanne Hornsey QC Sample Group 9903268-01,03,04,08 Reported Mar 24 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8015 <br /> Analyst PETER ALCALA <br /> ANALYTE Gasoline <br /> QC Batch # GC031599BTEX18A <br /> Sample No GW9903286-4 <br /> Date Prepared 3/15199 <br /> Date Analyzed 3115199 <br /> Instrument I D # G(:HP18 <br /> Sample Conc ug/L N D <br /> Conc Spiked ug/L 250 <br /> Matrix Spike ug/L 230 <br /> % Recovery 92 <br />(� Matrix <br /> Spike Duplicate ug/L 230 <br /> % Recovery 92 <br /> Relative % Difference 00 <br /> RPD Control Limits 0-25 <br /> LCS Batch# GC031599BTEX18A <br /> Date Prepared 3115199 <br /> Date Analyzed 3115199 <br /> Instrument I D # GCHP18 <br /> Conc Spiked, ug/L 250 <br /> LCS Recovery ug/L 230 <br /> LCS % Recovery 92 <br /> Percent Recovery Control Limits <br /> MSiMSD 60140 <br /> LCS 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 matrix spike is an aliquot of sample <br /> fortified with known quantities of specific compounds and sublected 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 /> Kayv my <br /> Project Manager <br />