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' 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650) 364-9233 <br /> Sequoia 1 404 N Wiget Lane Wainut Creek CA 94598 (925)988-%00 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)79Z 0342 <br /> 1551 Industrial Road San Carlos CA 94070 411 1 (650)232 9600 FAX(650)232 9612 <br /> PATCAssociates, Inc Client Project ID N&S Irrigation 14981 0001 <br /> 1117 Lone Palm Avenue Matrix Liquid <br /> ' Modesto, CA 95351-1502 <br /> Attention Jeanne Homsey Work Order# 9902A44-02 Reported Mar 3, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes BTEX as TPH <br /> ' Benzene <br /> QC Batch# GCO22499802005A GCO22499802005A GCO22499802005A GCO22499802005A GCO22499802005A <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 C Westwater C Westwater C Westwater C Westwater C Westwater <br /> MS/MSD # 9021351 9021351 9021351 9021351 9021351 <br /> Sample Conc N D N D N D N D N D <br /> Prepared Date 2/24/99 2/24/99 2/24/99 2/24/99 2/24/99 <br /> Analyzed Date 2/24/99 2/24/99 2/24/99 2/24/99 2/24/99 <br /> ' Instrument I D # HP5 HP5 HP5 HP5 HP5 <br /> Cork Spiked 20,rg/L 20ug/L 20ug/L 60yg/L 270pg/L <br /> Result 20 20 20 fit 270 <br /> MS % Recovery 100 100 100 103 100 <br /> Dup Result 19 20 20 fit 280 <br /> MSD % Recov 95 100 100 103 104 <br /> RPD 51 00 00 00 36 <br /> RPD Limit 0-20 020 0-20 0-20 0-50 <br /> LCS # LCS022499 LCS022499 LCS022499 LCS022499 LCS022499 <br /> ' Prepared Date 2/24/99 2/24/99 2/24/99 2/24/99 2/24/99 <br /> Analyzed Date 2/24/99 2/24/99 2/24/99 2/24/99 2/24/99 <br /> ' Instrument I D # HP5 HP5 HP5 HP5 HP5 <br /> Conc Spiked 20Ng/L 20pg/L 20ug/L 60pg/L 270yg/L <br /> LCS Result 18 19 19 59 280 <br /> ' LCS % Recov 90 95 95 98 104 <br /> LCS 70-131 70-130 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 /> ,,Elap#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 /> Kwan K1 I <br /> Project Manager **MS=Matrix Spike MSD=MS Duplicate RPD=Relative% Difference 9902A44 AAA ¢3> <br />