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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)3649600 FAX(650)364-9233 <br /> 404 N Vdlget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921 9600 FAX(916)921-0100 <br /> Analytical <br /> rr 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> l� <br /> ATC Associates, Inc Client Project ID Farmer Prop 62596 0001101 <br /> 1 1 17 lone Palm Avenue <br /> Modesto, CA 95351-1502 <br /> Attention Drew Van Allen QC Sample Group 9812C90-06 Reported Jan 7 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8015 <br /> Analyst BTF <br /> ANALYTE Gasoline <br /> QC Batch # GCO10498BTEX02A <br /> i <br /> Sample No GW9812F36-02MS <br /> Date Prepared 114/98 <br /> Date Analyzed 114198 <br /> Instrument I D # GCHP02 <br /> Sample Conic ug/L N D <br /> Conc Spiked, ug/L 250 <br /> i <br /> Matrix Spike ug/L 250 <br /> % Recovery 100 <br /> Matrix <br /> � Spike Duplicate, uglL 220 <br /> % Recovery 89 <br /> Relative % Difference 12 <br /> RPD Control Limits 0-25 <br /> LCS Batch# GCO104986TEX02A <br /> Date Prepared 1/4/98 <br /> Date Analyzed 114/98 <br /> Instrument I D # GCHP02 <br /> Conc Spiked ug1L 250 <br /> LCS Recovery ug/L 300 <br /> LCS % Recovery 122 <br /> Percent Recovery Control Limits <br /> msimso 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 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 /> Karr imyal <br /> Project Manager <br /> `6cl <br />