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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N Wiget lane Walnut Creek CA 94598 (925)988-9600 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-x865 FAX(707)792-0342 <br /> ATC Associates, Inc Client Project ID KOK Realty 62581 0001 <br /> 1260 Graphics Drive <br /> Modesto, CA 95351-1502 <br /> Attention Torn Letterman QC Sample Group 9806EO1-01,03 Reported Jun 30 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8015 <br /> Analyst C MEDINA <br /> ANALYTE Gasoline <br /> QC Batch # GC062698BTEX17A <br /> Sample No GW9806G27-7 <br /> Date Prepared 6126198 <br /> Date Analyzed 6/26/98 <br /> Instrument f D# GCHP17 <br /> Sample Conc , ug/L N D <br /> Conc Spiked, uglL 250 <br /> Matrix Spike, ug/L 220 <br /> % Recovery 89 <br /> Matrix <br /> Spike Duplicate ug/L 220 <br /> % Recovery 90 <br /> Relative % Difference 1 1 <br /> RPD Control Limits 0-25 <br /> LCS Batch# GWBLK06269BABS <br /> Date Prepared 6/26198 <br /> Date Analyzed 6126/98 <br /> Instrument I D# GCHP17 <br /> Conc Spiked ug/L 250 <br /> LCS Recovery ug/L 220 <br /> LCS % Recovery 86 <br /> Percent Recovery Control Limits <br /> MS/MSD 60140 <br /> F7 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 /> * '-7 4 fortified with known quantities of specific compounds and subjected to She 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 /> 7Ka Cimy <br /> Project Manager <br />