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SEQUOIA ANALYTICAL <br /> - i)— 680 Chesapeake Drive • Redwood City,CA 94063 <br /> (415) 364-9600 FAX (415) 364-9233 <br /> -HESNA Client Project ID W0290 01, BJJ Trucking <br /> 1710 Main StreetMatrix Liquid }, <br /> z Escalon, CA 95320 <br /> Attention Lois Frantz QC Sample Group 4A48301 Reported Jan 25, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> Method EPA 8020 EPA E020 EPA 8020 EPA 8020 <br /> Analyst M Nipp M Nipp M Nipp M Nipp <br /> MS/MSD <br /> Batch#" 4A38709 4A38709 4A38709 4A38709 <br /> Date Prepared - - - - <br /> Date Analyzed 1/14/94 1/14/94 1/14/94 1/14/94 <br /> Instrument I D # GCHP-3 GCHP-3 GCHP 3 GCHP-3 <br /> Cone Spiked. 10 pg/L 10 pg/L 10 pg/L 30 pg/L <br /> . Matrix Spike <br /> % Recovery: 100 100 100 100 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery* 100 100 99 100 <br /> Relative% <br /> Difference 00 00 10 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 matrix that is analyzed using the same reagents, <br /> OEQUOIA 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 /> R/K— <br /> C� vg-- the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference,the LCS recovery 4s to be used to validate the batch <br /> Vickie Tague <br /> Project Manager 4A48301 WAT <2> <br />