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680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650) 364-9233 <br /> Sequoia 4O4 N Wiget 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 /> 11, Analytical 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707) 792 1865 FAX(707) 792 0342 <br /> 1551 Industrial Road San Cartos CA 94070 4111 (650)232-9600 FAX (650) 232 9612 <br /> ATC Associates, 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# 9902A44-01, 03 Reported Mar 3, 1999 <br /> ' QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes BTEX as TPH <br /> Benzene <br /> QC Batch# GCO22399802002A GCO22399802002-A G0022399802002A (3CO22399802002A GCO22399802002A <br /> Analy Method EPA 8020 EPA 8020 EPA 6020 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 # 9021937 9021937 9021937 9021937 9021937 <br /> ' Sample Conc N D N D N D N D NO <br /> Prepared Date 2/23/99 2/23/99 2/23/99 2/23/99 2/23/99 <br /> Analyzed Date 2/23/99 2/23/99 2/23/99 2/23/99 2/23/99 <br /> Instrument I D # HP2 HP2 HP2 HP2 HP2 <br /> Conc, Spiked 20frg/L 20jug/L 20ug/L 60Ng/L 310pg/L <br /> Result 19 19 20 63 310 <br /> MS % Recovery 95 95 100 105 100 <br /> Dup Result 17 16 16 55 290 <br /> MSD % Recov 85 80 80 92 94 <br /> ' RPD 111 171 222 136 67 <br /> FPD Limit 020 020 020 0-20 050 <br /> LCS # LCS022399 LCS022399 LCS022399 LCS022399 LCS022399 <br /> ' Prepared Date 2/23/99 2/23/99 2/23/99 2/23/99 2/23/99 <br /> Analyzed Date 2/23/99 2/23/99 2/23/99 2/23/99 2/23/99 <br /> Instrument I D # HP2 HP2 HP2 HP2 HP2 <br /> Conc Spiked 20Vg/L 20pg/L 20ug/L 60Mg/L 310pg/L <br /> LCS Result 17 17 17 57 300 <br /> LCS %Recov 85 85 85 95 97 <br /> ' LCS 70-130 7g 130 70-13n 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 enure 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 /> Kay4;an`Klmyal <br /> ' Project Manager **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative% Difference 9902A44 AAA <2> <br />