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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive - Redwood City, CA 94063 <br /> (415) 364-9600 FAX (415) 364-9233 <br /> RESNA Client Project ID 150002 00 Laidlaw Corp <br /> `1710 Main Street Matrix Liquid <br /> Escalon, CA 95320 <br /> Attention John Lane OC Sample Group 4B15501-6 Reported Feb 16, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Anal st: J Minkel J Minkel J Minkel J Minkel <br /> MS/MSD <br /> Batch#: 4BO4504 4B04504 4BO4504 4BO4504 <br /> Date Prepared- - - - <br /> Date Analyzed: 2/7/94 2/7/94 2/7/94 2/7/94 <br /> Instrument I D #: GCHP-17 GCHP-17 GCHP-17 GCHP-17 <br /> Conc Spiked: loug/L 10pg/L 10ug/L 30pg/L <br /> Matrix Spike <br /> % Recovery: 94 94 95 97 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 93 93 93 97 <br /> Relative% <br /> Difference: 1 1 1 1 21 00 <br /> LCS Batch#. - - - - <br /> Date Prepared - - - - <br /> Date Analyzed, - - - <br /> Instrument I D.# - - - <br /> LCS % <br /> Recovery. - - - - <br /> % Recovery <br /> Control Limits 71-133 72-128 72-130 71-120 <br /> Please Note <br /> The LCS is a control sample of known,interferent free matnx 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 /> Vickie Tague <br /> Project Manager 4B15501 WAT <2> <br />