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680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364_9233 <br /> G) Sequoia 404 N Wlget Lane Walnut Creek CA 94599 (925)988-9600 FAX(9Z5)968-9673 <br /> 8i9 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-010 0 <br /> VIF Analytical 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792 1865 FAX(707)79z-0342 <br /> ATC Associates Client Project 10 KOK Realty 62581 0001 <br /> 1260 Graphics Dr <br /> Modesto, CA 95351-1502 <br /> Attention Jeanne Romsey QC Sample Group 9809733-01 Reported Sep 25, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8020 <br /> Analyst GR/DB <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> QC Batch# GCO92398STEX21A <br /> Sample No GW9809755-4 <br /> Date Prepared 9123198 9123/98 9123/98 9123198 <br /> Date Analyzed 9/23198 9/23198 9123198 9123198 <br /> Instrument 10# GCHP21 GCHP21 GCHP21 GCHP21 <br /> Sample Conc, ug/L N N D ND N D <br /> Conc Spiked, ug/L 10 10 10 30 <br /> Matnx Spike,ug/L 10 10 10 31 <br /> %Recovery 103 102 102 102 <br /> Matnx <br /> pike Duplicate, ug/L 10 10 10 31 <br /> %Recovery 105 103 102 103 <br /> elative%Difference 1 9 0 98 0 0 098 <br /> RPD Control Limits 0-25 0-25 0-25 0-25 <br /> LCS Batch# GWLCS092398A <br /> Date Prepared 9/23198 9123/98 9/23198 9123/98 <br /> Date Analyzed 9123/98 9123198 9/23/98 9/23198 <br /> Instrument I D# GCHP21 GCHP21 GCHP21 GCHP21 <br /> Conc Spiked, ug/L. 10 10 10 30 <br /> LCS Recovery,ug/L. 11 11 11 32 <br /> LCS % Recovery 108 106 105 107 <br /> Percent Recovery Control Limits <br /> F- <br /> lVisimso 60-140 60-140 60-140 60140 <br /> LCS 70-130 70-130 70-130 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 /> OCS rALYTICAL preparation and analytical methods employed for the samples The matnx spike is an aliquot of sample <br /> fortified with known quantities ofspecific compounds and subjected to the entire analytical procedure if <br /> th ecovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> ante rence the LCS recovery is to be used to validate the batch <br />