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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N Wlget Lane Walnut Creek CA 94598 (92S)988-9600 FAX(925)988-9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-010 0 <br /> 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707}792-0342 <br /> ATC Associates, Inc Client Project ID Farmer Prop 62596 0001101 <br /> 1117 Lone Palm Avenue <br /> Modesto, CA 95351-1502 <br /> Attention Drew Van Allen QC Sample Group 9812090-01, 05, 07 Reported Jan 7 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8015 <br /> Analyst R GECKLER <br /> ANALYTE Gasoline <br /> QC Batch # GC123198BTEX02A <br /> Sample No 9812H73-1 <br /> Date Prepared 111199 <br /> Date Analyzed 111199 <br /> Instrument I D # GCHP02 <br /> Sample Cone uglL N D <br /> Cone Spiked uglL 250 <br /> Matrix Spike uglL 280 <br /> % Recovery 112 <br /> Matrix <br /> � Spike Duplicate, uglL 260 <br /> % Recovery 104 <br /> Relative % Difference 7 4 <br /> RPD Control Limits 0-25 <br /> LCS Batch# GC1231988TEX02A <br /> Date Prepared 12/31/98 <br /> Date Analyzed 12/31/98 <br /> Instrument I D # GCHP02 <br /> Cone Spiked ug/L 250 <br /> LCS Recovery uglL 290 <br /> LCS % Recovery 116 <br /> Percent Recovery Control Limits <br /> MS/MSD 60140 <br /> LCS 70 1 30 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> Please Nate <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 subjected to the entire analytical procedure If <br /> the recovery of analytes from the matrix spike does not fall within specified central limits due to matrix <br /> interference the LCS recovery is to be used to validate the batch <br /> Kaan Kimy i� <br /> Project Manger <br />