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1 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650) 364-9233 <br /> Sequoia 404 N Wlget Lane Walnut Creek.CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> U,Q7-FAnalytical 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707) 792-1865 FAX(707)792-0342 <br />' ATC Associates, Inc Client Project ID Ripon USD 13099 0001 <br /> 1117 Lone Palm Avenue Matrix Liquid <br />' Modesto, CA 95351-1502 <br /> Attention .Jeanne Hornsey Work Order# 9901 E93-01 Reported Feb 22, 1999 <br />' QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xyienes BTEX as TPH <br />' Benzene <br /> QC Batch# GCO20499802009A GCO20499802009A GCO20499802009A GCO20499802009A GCO20499802009A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M <br />' Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst D Newcomb D Newcomb D Newcomb D Newcomb D Newcomb <br /> MS/MSD# 9011660 9011660 9011660 9011660 9011660 <br />' Sample Conc N D N 0 N D N D N D <br /> Prepared Date 2/4/99 2/4/99 2/4/99 2/4/99 2/4/99 <br /> Analyzed Date 2/4/99 2/4/99 2/4/99 2/4/99 2/4/99 <br /> Instrument I D # HP9 HP9 HP9 HP9 HP9 <br />' Conc Spiked 20 yg/L 20 Yg/L 20 yg/L 60 ug/L 320 ug/L <br /> Result 19 20 20 60 280 <br />�MS % Recovery 95 100 100 100 88 <br /> Dup Result 20 20 20 62 290 <br /> MSD % Recov 100 100 100 103 91 <br /> rRPD 51 00 00 33 35 <br /> RPD Limit 0-20 0-20 020 0-20 0-50 <br /> LCS # LCS020499 LCS020499 LCS020499 LCS020499 LCS020499 <br /> ' Prepared Date 2/4/99 2/4/99 2/4/99 2/4/99 2/4/99 <br /> Analyzed Date 2/4/99 2/4/99 2/4/99 2/4/99 2/4/99 <br /> Instrument I D # HP9 HP9 HP9 HP9 HP9 <br /> Conc Spiked 20 fag/L 20 ug/L 20 jig/L 60 ug/L 320 Mg/L <br /> LCS Result 20 20 20 61 300 <br /> ' LCS % Recov 100 100 100 102 94 <br /> 60140 60-140 60-140 60-140 <br /> ' LCS 70-130 70130 70-130 70-130 50-150 <br /> Control Limits <br /> ' Please Note <br /> SEQUOIA ANALYTICAL The LCS is a control sample of known interferent-free matrix that is analyzed using the same reagents, <br /> lap#1271 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 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 /> Kayv imy <br /> ' Project Manager **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative % Difference 9901E93 AAA <2> <br />