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�1 it u p <br /> 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 /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916) 921-010 0 <br /> Analytical <br /> 1455 McDowell Blvd North Ste D Petaluma CA 94954 707 792-1865 FAX 707)792-0342 <br /> ATC Associates, Inc Client Project ID Gardner Property 62586 000104 <br /> 1260 Graphics Drive <br /> Modesto, CA 95351-1502 <br /> Attention Tom Lutterman QC Sample Group 9809101-02, 07 Reported Oct 13, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8015 <br /> Analyst NC <br /> ANALYTE Gasoline <br /> QC Batch # GC100298BTEX03A <br /> Sample No GW9809D23-3 <br /> Date Prepared 1012198 <br /> Date Analyzed 1012198 <br /> Instrument I D# GCHP03 <br /> Sample Conc , ug/L N D <br /> Conc Spiked, ug/L 250 <br /> Matrix Spike, ug/L 230 <br /> % Recovery 93 <br /> Matnx <br /> Spike Duplicate, ug/L 220 <br /> % Recovery 90 <br /> Relative % Difference 3 3 <br /> RPD Control Limits 0-25 <br /> LCS Batch# GWLCS100298A <br /> Date Prepared 1012198 <br /> Date Analyzed 1012198 <br /> Instrument I D# GCHP03 <br /> Conc Spiked, ug/L 250 <br /> LCS Recovery, uglL 220 <br /> LCS % Recovery 90 <br /> Percent Recovery Control Limits <br /> MS/MSD 60-140 <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 /> 1 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 /> an Kim <br /> Project Manager <br />