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[) 1 <br /> 680 Chesapeake Drive Redwood City C4 94063 (650) 364-9600 FAX(650) 364-9233 <br /> 4D- Sequoia 404 N Wlget lane Walnut Creek CA 94598 (925)988-9600 FAX(925)9438-9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921.0100 <br /> WWO <br /> 1455 McDowell Blvd North Ste D Petaluma.C's 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 Hornsey 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 /> QC Batch# GCO915980HBPEXZ <br /> Sample No 9809733-1 <br /> Date Prepared 9/15198 <br /> Date Analyzed 9/18/98 <br /> Instrument 1 D# GCHP4A <br /> Sample Conc, ug/L. 3200 <br /> Conc Spiked,ug/L 1000 <br /> Matrix Spike, uglL 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 9/15198 <br /> Date Analyzed 9/18/98 <br /> Instrument I D# GCHP4A <br /> Conc Spiked,uglL 1000 <br /> Recovery, ug/L 730 <br /> LCS%Recovery 73 <br /> Percent Recovery Control Limits <br /> F- <br /> msimsD 50-150 <br /> LC Ba-140 <br /> Quality As rance 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 /> ANALYTICAL. preparation and analytical methods employed for the samples The matnx spike is an aliquot of sample <br /> fortified with known quantrVes 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 /> Kay tmyal <br /> Project Manager <br />