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680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> ' Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> A 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> ����TT ��� 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707) 792-0342 <br /> rJ/ 1551 Industrial Road San Carlos CA 94070-4111 (650)232-9600 FAX(650)232-9612 <br /> Wequoia Analytical Client Project 1D 1-905529- 81aine 1 ech Services, Inc <br /> 1551 Industrial Blvd Matrix Liquid <br /> San Carlos, CA 94070 <br /> Attention Mike Gregory QC Sample Group 9052409-412 Reported Jun 16, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte 1,1-Diohloro- Tnchloro- Chloro- Diesel Oil&Grease <br /> ethene ethene benzene <br /> QC Batch# GCO60499 GCO60499 GCO60499 SP060299 SP060199 <br /> 801006A 801006A 801006A 8015EXB 5520EXA <br /> Analy Method EPA 8010 EPA 8010 EPA 8010 EPA 8015M SM 5520 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 3510 SM 5520 <br /> Analyst P Kosovskaya P Kosovskaya P Kosovskaya K Grubb N VanSlambrook <br /> MS/MSD# 9060443 9060443 9060443 BLK060299B BLK060199 <br /> Sample Conc N D N D IN D N D N D <br /> Prepared Date 6/4/99 6/4/99 6/4/99 6/2/99 6/1/99 <br /> Analyzed Date 6/4/99 6/4/99 6/4/99 6/3/99 6/1/99 <br /> Instrument l D # HP-6 HP-6 HP-6 HP-3A Manual <br /> Conc Spiked 20pg/L 20pg/L 20ug/L 500Ng/L 100 mg/L <br /> Result 17 21 20 310 97 <br /> MS % Recovery 85 105 100 62 97 <br /> Dup Result 16 18 18 360 98 <br /> IV MSD % Recov 8o 90 90 72 98 <br /> RPD 61 15 11 15 10 <br /> RPD Limit 0-25 0-25 0-,25 0-50 0-30 <br /> LCS# L08060499 LCS060499 LCSD60499 LCS060299B LCS060199 <br /> Prepared Date 6/4/99 6/4/99 6/4/99 6/2/99 6/1/99 <br /> Analyzed Date 6/4/99 6/4/99 6/4/99 6/3/99 6/1/99 <br /> Instrument I D # HP-6 HP-6 HP-6 HP-3A Manual <br /> Conc Spiked 20pg/L 20,ug/L 20ug/L 500ug/L 100 mg/L <br /> LCS Result 16 18 19 340 100 <br /> LCS % Recov 80 90 95 68 100 <br /> LCSD Result 440 - <br /> LCSD % Recov. 88 <br /> 50 150 <br /> LCS 65-135 70-130 70-130 60140 70-130 <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 AN TICAL, #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 /> Cjlie4oWestwater **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative% Difference <br /> Project Manager <br /> 9052409 SSS <13> <br />