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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)792-1865 FAX(707)792-0342 <br /> [Attention <br /> TC Associates, Inc Client Project ID Westrec Prop 1 Kir 62514 0001 <br /> 260 Graphics Drive <br /> odesto, CA 95351-1502 <br /> Jeanne Homsey QC Sample Group 9806G74-01-07 Reported Jul 16, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8015A <br /> Analyst A Porter <br /> ANALYTE Diesel <br /> QC Batch # GC0702980HBPEXA <br /> Sample No 9806F57-14 _ <br /> Date Prepared 712/98 <br /> Date Analyzed 716/98 <br /> Instrument I D # GCHP5A <br /> Sample Cone ug/L 7800 THE SAMPLE MS AND MSD WERE <br /> Conc Spiked ug1L 1000 ALL RUN AT A 4X DILUTION <br /> Matrix Spike, ug/L 7200 <br /> % Recovery -60 <br /> Matrix <br /> Spike Duplicate ug/L 7000 <br /> % Recovery -80 <br /> Relative % Difference 29 <br /> RPD Control Limits 0-50 <br /> LCS Batch# BLK070298AS <br /> Date Prepared 712198 <br /> Date Analyzed 716198 <br /> Instrument 1 D # GCHP5A <br /> Conc Spiked ug/L 1000 <br /> Recovery ug/L 730 <br /> LCS % Recovery 73 <br /> Percent Recovery Control Limits <br /> MS/mso 50150 <br /> E: LCS 60140 <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 anaiyticaL methods employed for the samples The matrix spike is an aliquot of sample <br /> t ! 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 recovery is to be used to validate the batch <br /> Wa ai <br /> Project Manager <br />