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r <br /> SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City,CA 94063 <br /> (415) 364-9600 FAX(415) 364.9233 <br /> '•'�JA} y 4+i+;} +M.y r <br /> r.w F h w..v�•.�.t. k n r .../..'.N.akw'r/ •,^...ry <br /> Blame Tech Services,Inc r Client Project ID.N Shell, 141 N El Dorado <br /> 985 Timothy Drive Matrix Liquid <br /> San.lose, CA 95133 <br /> Attention Jim Keller QC Sample Group 4BA1403, 06 Reported Feb 25, 1994 <br /> n• v v n v x • +w v v • n . x i <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> Method. EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst J Minkel J Msnkel J Minkel J Minkel <br /> MS/MSD <br /> Batch# 4696607 4B96607 4B96607 4896607 <br /> Date Prepared - - - <br /> Date Analyzed 2/19/94 2/19/94 2/19/94 2/19/94 <br /> Instrument I D # GCHP-17 GCHP-17 GCHP 17 GCHP-17 <br /> Cone. Spliced 10Ng/L 10pg/L 1Oug/L 30pg/L <br /> Matrix Spike <br /> %Recovery 110 110 110 107 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 110 110 110 110 <br /> Relative% <br /> Difference: 00 00 00 2 a <br /> LCS Batch#: - - - <br /> Date Prepared: - - - <br /> Date Analyzed: - - - <br /> Instrument I D #' - - - - <br /> LCS % <br /> Recovery: - - - <br /> L <br /> Recovery <br /> ontrol Limits: 71-133 72-128 72-130 71-120 <br /> Please Note <br /> The LCS Is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> �E NALYTiCAL 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 /> Suzanne Chin <br /> Project Manager 4BA1401 BLA <4> <br />