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4D— <br /> 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 /> IWO Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Ov <br /> MPDS" Services v Client Project'It) AUnocai #6981; 4707 pacific Ave , Stockton <br /> 2401 Stanwell Dr, Ste 400 Matrix Liquid <br /> Y Concord, CA 94520 <br /> Attention Avo Avedisslan 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# 5011295 5011295 5011295 5011295 <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 2 HP-2 HP-2 HP-2 <br /> Conc Spiked 20 ug/L 20 pg/L 20 ug/L 60 us/L <br /> Matrix Spike <br /> % Recovery 90 100 105 108 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 85 100 105 105 <br /> Relative % <br /> Difference' 57 00 00 28 <br /> vhr nW'e. •'.+ vrtn +.r v r r .ti v• + .. r vrvnr v S"4 . ry }v vv vv r + + + ♦v t t vry r v }4lrf++J4,?n rcxrv+i v+i <br /> LCS Batch# 1 LCS020295 1 LCS020295 1 LCS020295 1 LCS020295 <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-2 HP-2 HP-2 HP-2 <br /> LCS % <br /> Recovery 88 104 112 114 <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 /> 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 /> eignature on File the recovery of analytes from the matrix spike does not fail within specified control limits due to matrix <br /> Alan B Kemp interference,the LGS recove Is to be used to validate the batch <br /> Project Manager <br /> 5011287 MPD a57 <br />