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680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> Sequoia 404 N Wlget 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 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707) 792-1865 FAX(707)792-0342 <br /> ATC Associates Client Project ID KOK Realty 62581 0001 <br /> 1260 Graphics Dr <br /> Modesto, CA 95351-1502 <br /> Attention Jeanne Homsey QC Sample Group 9809733-01-04, -06 Reported Sep 25, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8015A <br /> Analyst A PORTER <br /> ANALYTE Diesel <br /> GIC Batch# GC0915980HBPEXZ <br /> Sample No 9809733-1 <br /> Date Prepared 9115198 <br /> Date Analyzed 9118198 <br /> Instrument 10# GCHP4A <br /> Sample Conc,ug/L 3200 <br /> Conc Spiked,ug/L 1000 <br /> Matrix Spike, ug/L 1800 <br /> %Recovery -140 <br /> Matrix <br /> pike Duplicate,ug/L 1900 <br /> %Recovery -130 <br /> elative% Difference 74 <br /> RPD Control Limits 0-50 "Spike diluted out <br /> LCS Batch# BLK091598ZS <br /> Date Prepared 9115198 <br /> Date Analyzed 9/18/98 <br /> Instrument I D# GCHP4A <br /> Conc Spiked,ug/L 1000 <br /> Recovery, ug/L 730 <br /> LCS% Recovery 73 <br /> Percent Recovery Control Limits <br /> F- <br /> IVISIMS0 50-150 <br /> LC BO-140 <br /> Quality As ranee Statement Ali 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 /> S 1 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 anaiytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference the LCS recoveryis to be used to validate the batch <br /> Kay Imya1 <br /> Project Manager <br />