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Sequoia 600 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (92S)988-9600 FAX(925)988-9673 <br /> fwl� 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)792-0342 <br /> Blaine Tech Services, Inc Client Project I D Chevron 9-6171/9811223-1-2 <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Christine Lillie Work Order# 9812F88-01, 02 Reported Jan 14, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Lead <br /> QC Batch,# ME0106997000MDA <br /> Analy Method EPA 239 2 <br /> Prep Method EPA 3020 <br /> Analyst J Jencks <br /> MS/MSD# 9812F8801 <br /> Sample Conc N D <br /> Prepared Date 1/6/99 <br /> Analyzed Date 1/8/99 <br /> Instrument 1 D # MTJA3 <br /> Conc Spiked 0 050 mg/L <br /> Result 0 053 <br /> MS % Recovery 106 <br /> Dup Result 0 054 <br /> MSD % Recov 108 <br /> RPD 19 <br /> RPD Limit 0-20 <br /> LCS # LCS010699 <br /> Prepared Date 1/6/99 <br /> Analyzed Date 1/8/99 <br /> Instrument I D # MTJA3 <br /> Conc Spiked. 0 050 mg/L <br /> LCS Result. 0 053 <br /> LCS % Recov 106 <br /> 75-125 <br /> LCS 80-120 <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 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 /> ry <br /> ro anager *"MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9812F88 BLA <6> <br />