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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive - Redwood City, CA 94063 <br /> via-OF (415) 364-9600 - FAX (415) 364-9233 <br /> Blaine Tech Services, Inc Client Project ID Shell, 141 N EI Dorado, Stockton <br /> 985 Timothy Drive Matrix Water <br /> San Jose, CA 95133 <br /> Attention Jim Keller OC Sample Group 3KE5501-10 Reported Dec 3, 1993 <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, M Nipp M Nipp M Nipp M Nipp <br /> MS/MSD <br /> Batch#' 3KE6701 3KE6701 3KE6701 3KE6701 <br /> Date Prepared - - - <br /> Date Analyzed, 11/29/93 11/29/93 11/29/93 11/29/93 <br /> Instrument I D.#. GCHP 17 GCHP-17 GCHP 17 GCHP 17 <br /> Conc, Spiked 10 ug/L 10 yg/L 10 pig/L 30 erg/L <br /> Matrix Spike <br /> %Recovery 97 96 95 93 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery- 96 96 96 97 <br /> Relative% <br /> Difference 1 0 00 10 3 5 <br /> LCS Batch#. - - <br /> Date Prepared. <br /> Date Analyzed - - <br /> Instrument I D # - - <br /> LCS% <br /> Recovery - <br /> % Recovery <br /> Control Limits 55-145 47-149 47-155 56-140 <br /> Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> WE04014 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 enure 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 /> Peggjl Penner 3KE5501 BLA c5> <br /> Project Manager <br />