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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> a- ) <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX 916921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 707 792-1865 FAX(707)79Z-034Z <br /> 0 <br /> ATC Associates, Inc Client Project ID KOK Realty 62581 0001 <br /> 1260 Graphics Drive <br /> Modesto, CA 95351-1502 <br /> Attention Tom Lutterman QC Sample Group 9806EOI-02 Reported Jun 30, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8020 <br /> Analyst N Herrera <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> QC Batch # GC062598BTEX21 A <br /> Sample No GW9806D66-8 <br /> Date Prepared- 6/25198 6125198 6/25198 6125/98 <br /> Date Analyzed 6/25/98 6/25198 6/25198 6/25/98 <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 7 7 7 9 83 25 <br /> % Recovery 77 79 83 83 <br /> . Matrix - <br /> Spike Duplicate ug/L 7 7 79 8 2 25 <br /> % Recovery 77 79 82 $3 <br /> Relative % Difference 00 00 1 2 0 0 <br /> RPD Control Limits 0-25 0-25 0-25 0-25 <br /> LCS Batch# GWBLK062598ABS <br /> Date Prepared 6/25/98 6125198 6/25/98 6125/98 <br /> Date Analyzed 6/25/98 6/25198 6125/98 6125198 <br /> Instrument I D # GCHP21 GCHP21 GCHP21 GCHP21 <br /> Conc Spiked ug/L 10 10 10 30 <br /> LCS Recovery ug/L 79 8 2 8 5 26 <br /> LCS % Recovery 79 82 85 87 <br /> Percent Recovery Control Limits <br /> M$/MSD 60140 60-140 60140 60140 <br /> LCS 70130 70130 70130 70130 <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 /> SEQUOIA 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 analytes from the matnx spike does not fall within specified control limits due to matrix <br /> K an Kim y interference the LCS reovery is to be used to validate the batch <br /> Project Manager <br />