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• JUN-14-95 THU 10 : 13 2 2 P. 04
<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 /> Analytical 819 Straker Avenue Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100
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<br /> ATouchstone Development Client Project ID 8632-2, Chevron 948632
<br /> t�P O Box 2554 Matrix Solid f
<br /> �JSanta Rosa, CA 95405
<br /> PAttention Jeff Monroe OC Sample Group 9408E43 01-03 Reported Aug 29, 1994
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<br /> QUALITY CONTROL DATA REPORT
<br /> ANALYTE Benzene Toluene Ethyl Xylenes
<br /> Benzene
<br /> Method: EPA 8020 EPA 8020 EPAS020 EPA8020
<br /> Analyst: E Cunanan E Cunanan E Cunanan E Cunanan
<br /> MS/MSD
<br /> Batch#: 94MC7602 940807602 940807602 9408C7602
<br /> Date Prepared: 8/25/94 8/25/94 8/25/94 8/25/94
<br /> Date Analyzed: 8/25/94 8/25/94 8/25/94 8/25/94
<br /> Instrument I.D.#: GCHP-1 GCHP-1 GCHP-1 GCHP-1
<br /> Cone.Spiked: 0 20 ppm 0 20 ppm 0 20 ppm 060 ppm
<br /> Matrix Spike
<br /> % Recovery: 95 100 100 98
<br /> Matrix Spike
<br /> Duplicate%
<br /> Recovery: 95 95 95 93
<br /> Relative%
<br /> Difference. 00 51 51 52
<br /> �L71-'tom 'd�*52 � #•rb�°""
<br /> �,tF`e :3@ .., r C ,,y;,,. ': f:'a,+✓si�i.ahary,.}' yr«,s y ."r�isn�veYEw,�;ry F iy'>µh�fL,t, c :fi`a s >� a1{" >
<br /> �x���2 n ifi.k..'y-.,.`n.w....n,cs v ti^..i,... .t s`^o.:•w.4,vrr s l a d"..,..,..,.� .cv w.���X di �i, s:., .,. ,..c4,rocE,, f,�.,t:4 d 6.Kwxn .. ;k s .wr,2 „Y`,ti n'c
<br /> LCS Batch#: - - - -
<br /> Date Prepared - -
<br /> Date Analyzed: - - -
<br /> Instrument 1.13 # - - -
<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 /> SEQUOIA ANALYTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample
<br /> fortified with known quantitles of specific compounds and subjected to the entire analyticat procedure If
<br /> the recovery of analytes from the matrix spike does not fail within specified control liM'ts duo to matrix
<br /> interference,the LCS recovery is to be used to validate the batch
<br /> Vickie Tague Clark o488E43 TTT <1>
<br /> Project Manager
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