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dY 11 1 A <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 /> a- Ana�ytieal 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)92I-9600 FAX(916)921-Of 00 <br /> QF1455 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 9809101-01,03-06, 08 Reported Oct 13, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8015 <br /> Analyst G PESHINA <br /> ANALYTE Gasoline <br /> QC Batch # GC100198BTEX06A <br /> Sample No GW9809E94-5 <br /> Date Prepared 1011198 <br /> Date Analyzed 1011198 <br /> Instrument I D # GCHP06 <br /> Sample Conc , ug/L N D <br /> Cone Spiked ug/L 250 <br /> Matrix Spike, ug1L 240 <br /> % Recovery 96 <br /> Matrix <br /> Spike Duplicate ug/L 240 <br /> % Recovery 96 <br /> Relative % Difference 00 <br /> RPD Control Limits 0-25 <br /> LCS Batch# GC100198BTEX06A <br /> Date Prepared 1011198 <br /> Date Analyzed 1011198 <br /> Instrument I D# GCHP06 <br /> Cone Spiked, ug/L 250 <br /> LCS Recovery, ug/L 270 <br /> LCS % Recovery 108 <br /> Percent Recovery Control Limits <br /> F_ <br /> MSIMSD 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 /> 0 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 recover is to be used to validate the batch <br /> IC n Klmy <br /> rolect Manager <br />