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SEQUOIA ANALYTICAL <br /> ' 680 Chesapeake Drive • Redwood City, CA 94063 <br /> ` (415) 364-9600 FAX (415) 364-9233 <br /> Blaine Tech Services, Inc Client Project ID Shell, 6131 Pacific Ave, Stockton V <br /> 965 Timothy Drive Matrix Water <br /> San Jose, CA 95133 <br /> Attention Jim Keller QC Sample Group 3KE5401-06 Reported Dec 6, 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 Niop M Nipp M Niop M Nipp <br /> MS/MSD <br /> Batch#- 3KE3602 3KE3602 3KE3602 3KE3602 <br /> Date Prepared, - - <br /> Date Analyzed. 11/30/93 11/30/93 11/30/93 11/30/93 <br /> Instrument LD #- GCHP-17 GCHP-17 GCHP-17 GCHP-17 <br /> Conc Spiked 10 Ng/L 10 ug/L 10 fag/L 30 pg/L <br /> Matrix Spike <br /> % Recovery- 100 100 100 100 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 100 100 100 100 <br /> Relative% <br /> Difference 00 00 00 00 <br /> LCS Batch# - _ - <br /> Date Prepared - <br /> Date Analyzed: _ <br /> Instrument 1.101 # <br /> LCS % <br /> Aecove y- - - <br /> % ecovery <br /> Control Limits 55-145 47-149 47-155 56-140 <br /> Please Note <br /> %1 The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents <br />.SEQ�JOIA 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 /> P,� g Penner <br /> Project Manager 3KE5401 8LA <2> <br />