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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 1900 Bates Avenue Suite L Concord,CA 94520 (510) 686 9600 FAX(510)686 9689 <br /> war Analytical 819 Striker Avenue,Suite a Sacramento CA 95834 (916) 921-9600 FAX(916)921 OF Do <br /> WPOS Ser`vic'es Client Project iD ' Unocal #6981, 4707 Pacific Ave, Stockton <br /> 2401 Stanwell Dr, Ste 400 Matrix Liquid <br /> 'Concord, CA 94520 <br /> Attention Avo Avedissian QC Sample Group 5011287-299 Reported Feb 10, 1995 <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 Creusere M Creusere M Creusere M Creusere <br /> MS/MSD <br /> Batch#. 5011275 5011275 5011275 5011275 <br /> Date Prepared- 2/2/95 2/2/95 2/2/95 2/2/95 s <br /> Date Analyzed 2/2/95 2/2/95 2/2/95 2/2/95 <br /> Instrument I D # HP-5 HP-5 HP-5 HP-5 <br /> Cone Spiked 20 frg/L 20ug/L 20 frg/L 60pg/L <br /> Matrix Spike <br /> % Recovery 90 100 105 107 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 85 100 105 105 <br /> Relative % <br /> Difference 57 00 00 19 <br /> LCS Batch#: 3LCS020295 3LCS020295 3LCS020295 3LCS020295 <br /> Date Prepared. 2/2/95 2/2/95 2/2/95 2/2/95 <br /> Date Analyzed 2/2/95 2/2/95 2/2/95 2/2/95 <br /> Instrument I D # HP-5 HP-5 HP-5 HP-5 <br /> LCS <br /> Recovery 88 102 106 106 <br /> Recovery <br /> Control Limits 71-133 72-128 72-130 71-120 <br /> Please Note <br /> The LCS 1s a control sample of known,interferent free matrix that 1s analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL, #1271 preparation,and analytical methods employed for the samples The matrix spike 1s an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> gnature on File the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> Alan B Kemp interference,the LCS recovery 1s to be used to validate the batch <br /> Project Manager <br /> ,pq 5011287 MPD <6> <br /> tSd' <br />