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Sequoia 680 Chesapeake Drive Rcdwood 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 /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> WPM Services Client project IU 'Unocal #8981, 4707 pacific Ave, Stockton y { <br /> 2401 Stanwell Dr, Ste 400 Matrix Liquid Vi <br /> r 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#- 5010119 5010119 5010119 5010119 <br /> Date Prepared 2/6/95 2/6/95 2/6/95 2/6/95 ° <br /> Date Analyzed 2/6/95 2/6/95 2/6/95 2/6/95 <br /> Instrument I.D.# HP-5 HP-5 HP-5 HP-5 <br /> Conc Spiked 20pg/L 201rg/L 20pg/L 60Ng/L <br /> Matrix Spike <br /> % Recovery. 105 110 110 110 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 110 110 110 108 <br /> Relative % <br /> Difference 47 00 00 1 8 <br /> LCS Batch#. 3LCS020695 3LCS020695 3LC8020695 3LC6020695 <br /> Date Prepared 2/6/95 2/6/95 2/6/95 2/6/95 <br /> Date Analyzed. 2/6/95 2/6/95 2/6/95 2/6/95 <br /> Instrument I D # HP 5 HP-5 HP-5 HP-5 <br /> LCS % <br /> Recovery 94 96 98 98 <br /> Rem overy <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, #1271 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 /> •Signature on File the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference,the LCS recove is to be used to validate the batch <br /> Alan B Kemp <br /> Project Manager <br /> 5011287 MPD <Bn <br />