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Sequoia 4680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> j 04 N Wiget Lane Walnut Creek.CA 94598 (925)988-9600 FAX(9Z5)988-9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921.0100 <br /> 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 Or <br /> Modesto, CA 95351-1502 <br /> Attention Jeanne Homsey QC Sample Group 9809733-02-04, -06 Reported Sep 25 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8020 <br /> Analyst GRIDS <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> CC Batch# GC092198BTF-X21A <br /> Sample No GW9809552-3 <br /> Date Prepared 9121198 9121198 9121198 9121198 <br /> Date Analyzed 9121198 9/1/98 9121!98 9121/98 <br /> Instrument I D# GCHP21 GCHP21 GCHP21 GCHP21 <br /> Sample Conc, ug/L. N D N D N D N D <br /> Conc Spiked, ug/L 10 10 10 30 <br /> Matrix Spike,ug/L 10 10 10 31 <br /> % Recovery 102 102 103 103 <br /> Matrix <br /> pike Duplicate,ug/L 10 10 10 31 <br /> %Recovery 105 103 103 104 <br /> elative% Difference 2 9 0 98 00 097 <br /> RPD Control Limits 0-25 0-25 0-25 0-25 <br /> LCS Batch# GWLCS092198A <br /> Date Prepared 9121198 9/21198 9/21198 9121198 <br /> Date Analyzed 9121198 9121198 9/21/98 9/21198 <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 109 107 107 107 <br /> Percent Recovery Control Limits <br /> MS/M$o 60-140 60-140 Bo-140 60.140 <br /> LCS 70-130 70-130 70-130 70-130 <br /> Quality Ass nce 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 matnx that is analyzed using the same reagents <br /> OSE A ALYTICAL preparation and analytical methods employed for the samples The matnx spike is an aliquot of sample <br /> fortlfi 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 /> Kayvan yal Interference the LCS recove es to be used to validate the batch <br /> roject anager <br />