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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <br /> (415) 364-9600 FAX (415) 364-9233 <br /> RESNA h' Client Project ID W0309/Gardner Property x h <br /> 1710 Main Street Matrix Water <br /> Escalon, CA 95320 <br /> Attention John Lane QC Sample Group 3LE9401-3 Reported Jan 20, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8^,.20 <br /> Analyst. R Lister R Lister R Lister R Lister <br /> MS/MSD <br /> Batch# 4010063 4010063 4010063 4010063 <br /> Date Prepared - <br /> Date Analyzed 1/5/94 1/5/94 1/5/94 1/5/94 <br /> Instrument I D # N/A N/A N/A N/A <br /> Conc Spiked 5 Dug/L 5 Dug/L 5 0 j►g/L 15pg/L <br /> Matrix Spike <br /> % Recovery 112 108 iia 113 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 110 106 112 113 <br /> Relative% <br /> Difference 18 19 1 8 00 <br /> LCS Batch# - - - <br /> Date Prepared- - - - <br /> Date Analyzed- - - - <br /> Instrument I ❑ #- - - <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 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 /> U,y/�y/r1 «cf ttte A{/ the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> U interference,the LCS recovery is to be used to validate the batch <br /> Vickie Tague <br /> Project Manager 3LE9401 WAT <2> <br />