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i <br /> I <br /> 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> Sequoia 404 N Wlget lane Walnut Creek,CA 94598 (9Z5)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 9809733-02-04, -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 /> QC Batch# GCO92198BTEX21A <br /> Sample No GW9809552-3 <br /> Date Prepared 9121198 9121/98 9/21198 9121198 <br /> Date Analyzed 9/21198 9121198 9/21/98 9/21198 <br /> Instrument I D# GCHP21 GCHP21 GCHP21 GCHP21 <br /> Sample Conc, uglL 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 29 098 00 097 <br /> RPO Control Limits 0-25 0-25 0-25 0-25 <br /> LCS Batch# GWLCS092198A <br /> Date Prepared 9/21/98 9121/98 9/21/98 9121198 <br /> Date Analyzed 9/21/98 9/21/98 9/21198 9/21/98 <br /> Instrument I D# GCHP21 GCHP21 GCHP21 GCHP21 <br /> Conc Spiked,ug/L 10 10 10 30 <br /> LCS Recovery,uglL 11 11 11 32 <br /> LCS% Recovery 109_ 107- 107 w 107 <br /> Percent Recovery Control Limits <br /> F- <br /> ]VISIMS0 80-140 60-140 e0-140 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 matrix that is analyzed using the same reagents <br /> AE A AI_YTICAL preparation,and analytical methods employed for the samples The matrix spike rs an aliquot of sample <br /> fortifi known quantities of specific compounds and subjected to the entire analytical procedure If <br /> the recovery of analytes from the matnx 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 /> Kayvan yai <br /> roject anager <br />