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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650) 364-9233 <br /> 404 N W Set Lane Walnut Creek CA 94598 (925)988-%00 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) 79Z-0342 <br /> ATC Associates Inc Client Project ID Gardner Prop 62586 0001-04 <br /> 1117 Lone Palm Avenue <br /> Modesto, CA 95351-1502 <br /> Attention Tom Lutterman QC Sample Group 98127=34-01-02, 04 Reported Jan 11, 1999 <br /> QUALITY CONTROL: DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8015 <br /> Analyst BTF <br /> ANALYTE Gasoline <br /> QC Batch # GCO104998TEX17A <br /> Sample No GW9812F32-02MS <br /> Date Prepared 114199 <br /> Date Analyzed 1/4/99 <br /> Instrument I D # GCHP1 7 <br /> Sample Cone uglL N D <br /> Cone Spiked, uglL 250 <br /> Matrix Spike ug/L 190 <br /> % Recovery 76 <br /> Matrix <br /> Spike Duplicate uglL 220 <br /> % Recovery 88 <br /> Relative % Difference 15 <br /> RPD Control Limits 0-25 <br /> LCS Batch# GCO10499BTEX17A <br /> Date Prepared 114199 <br /> Date Analyzed 1!4!99 <br /> Instrument I D # GCHP17 <br /> Cone Spiked ug/L 250 <br /> LCS Recovery ug/L 250 <br /> LCS % Recovery 100 <br /> Percent Recovery Control Limits <br /> F- MS/MSD 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�s 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 entire analytical procedure I <br /> r <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 /> Pro)ect-Manage <br /> e <br />