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11 <br /> Sequoia 404 N WiLane <br /> Walnut Creek CA 94598 <br /> Analytical (925' 988-9600 FAX(925) 988-9673 <br /> i <br /> oy P Weston, Inc Tient Project 10 San Joaquin HSA <br /> 2300 Clayton Rd , Ste 1580 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Scott Lookingbill QC Sample Group W908214 Reported Aug 26, 1999 <br /> QUALITY CONTROL DATA REPORT <br />' Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch#: GCO81799 GCO81799 GC081799 GCO81799 <br />' 802002A 802002A 802002A 802002A <br /> Analy Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst J Minkel J Minkel J Minkel J Minkel <br /> MS/MSD# 908157-08 908157-08 908157-08 908157-08 <br /> Sample Conc N D N D N D N D <br /> Prepared Date 8/17/99 8/17/99 8/17/99 8/17/99 <br />' Analyzed Date 8/17/99 8/17/99 8/17/99 8/17/99 <br /> Instrument I D#: HP-2 HP-2 HP-2 HP 2 <br /> Conc Spiked: 20ug/L 20yg/L 20pg/L 60ug/L <br /> Result: 17 15 19 58 <br /> MS % Recovery: 85 75 95 97 <br />' Dup Result 18 16 17 54 <br /> •MSD % Recon . 90 80 85 90 <br /> RPD 57 65 11 71 <br />' RPD Limit. 0-20 0-20 0-20 0-20 <br />' LCS-# 2LCS081799 2LCS081799 2LCS081799 2LCS081799 <br /> Prepared Date. 8/17/99 8/17/99 8/17/99 8/17/99 <br />' Analyzed Hate. 8/17/99 8/17/99 8/17/99 8/17/99 <br /> Instrument I D #• HP-2 HP-2 HP-2 HP-2 <br /> Conc. Spiked 20ug/L 20pg/L 20ug/L 60ug/L <br /> LCS Result 20 18 19 62 <br /> LCS % Recon . 100 90 95 103 <br /> LCS <br /> 70-130 70-130 70-130 70-130 <br />' Control Limits <br /> Please Note <br /> I The LCS is a control sample of known,tnterterent4ree 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 /> 1$ 1 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 /> panne Feglay **MS=Matrix Spike,MSO=MS Duplicate,RPD=Relative%Difference <br /> Project Manager <br />' ,{ W908214 RIFW <2> <br />