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%wwl %WoChesapeake Drive Redwood (650)364-9600 FAX(650)364-9733 <br /> Sequoia 404 N.WIget Lane Walnut Creek,CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (9t6)921-9600 FAX(916)921-0(00 <br /> 1455 McDowell Blvd.North,Ste. D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Analytical 551 Industrlal Road San Carlos,CA 94070-4 1 1 1 (650)232-9600 FAX(6 0)232-9612 <br /> A'ro Associates, Inc. Cl i'66f'Prib'J'66i Ib:' Stockfon f RoyalOaks#62574-0006 <br /> 1117 Lone Palm Ave., Ste. B <br /> Matrix: Liquid <br /> :'Modesto, CA. 95351 <br /> Attention: J. Homsey QC Sample Group: 905-0861 Reported: May 20, 1999:.:: <br /> ................ ........ <br /> .. ........ <br /> La QUALITY CONTROL DATA REPORT <br /> Analyte: Benzene Toluene Ethyl Xylenes Diesel <br /> L.0 Benzene <br /> QC Batch#: GC051799 GCO51799 GC051799 GCO51799 SP051899 <br /> 802004A 802004A 802004A 802004A 8015EXA <br /> 1160 Analy. Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M <br /> Prep. Method: EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 3510 <br /> Analyst: C.Westwater C.Westwater C.Westwater C.Westwater K.Grubb <br /> MS/MSD#: 9050919 9050919 9050919 9050919 BLK051899 <br /> L.0 Sample Conc.: N.D. N.D. N.D. N.D. N.D. <br /> Prepared Date: 5/17/99 5/17/99 5/17/99 5/17/99 5/18/99 <br /> Analyzed Date: 5/17/99 5/17/99 5/17/99 5/17/99 5/18/99 <br /> Instrument I.D.#: HP-4 HP-4 HP-4 HP-4 HP-3A <br /> Conc. Spiked: 20pg/L 20 ijg/L 20pg/L 60 pg/L 500,ugIL <br /> Result: 20 17 18 60 550 <br /> MS %Recovery: 100 85 90 100 110 <br /> Dup. Result: 20 17 18 61 520 <br /> MSD % Recov.: 100 85 90 102 104 <br /> RPD: 0.0 0.0 0.0 1.7 5.6 <br /> RPD Limit: 0-20 0-20 0-20 0-20 0-50 <br /> ILA <br /> ... .. .. ... .. .. <br /> ... ......... <br /> X X <br /> �—U . ............... <br /> LCS#: 4LCS051799 4LCS051799 4LCS051799 4LCS051799 LCS051899 <br /> Prepared Date: 5/17/99 5/17/99 5/17/99 5/17/99 5/18/99 <br /> Analyzed Date: 5/17/99 5/17/99 5/17/99 5/17/99 5/1B/99 <br /> Instrument I.D.#: HP-4 HP-4 HP-4 HP-4 HP-3A <br /> Conc. Spiked: 20 Jig/L 20 pg/L 20,ug/L 60 pg/L 500 pg/L <br /> LCS Result: 21 18 is 63 Soo <br /> LCS % Recov.: 105 so 90 105 100 <br /> MS/MSD <br /> LCS 70-130 70-130 70-130 70-130 60-140 <br /> Control Limits <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, #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 /> Ado Dimple Sharma MS=Matrix Spike, MSIJ=MS Duplicate,RPD=Relative%Difference <br /> Project Manager <br /> 9050854.AAA <8> <br /> 60 Ka <br />