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r <br /> Sequoia o80 Chesapeake Drive Redwood City, CA 94063 t415) 364 9600 FAX(415) 364 9233 <br /> a_ 404 N Wiget Lanc Walnut Creck, CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> „� Analytical 819 Sinker Avenue Suite 8 Sacramento,CA 95834 (916) 92t 9600 FAX (916)921 0100 <br /> ,,Gettler Ryan/Geostrategies Client Project ID Unocal 087/Stockton ,t <br /> 3035 Prospect Park Drive, #110 Matrix Liquid <br /> ,Rancho Cordova, CA 95670 <br /> ,?Attention Greg Gurss wwh ry w Work Order# 9508004-04 u„w <br /> V.Reported Aug 9, 1995 <br /> r\r}L'r,rknO by viii 4�+^ nYt[ ^ w y ,t,ry ' 2”' tJ n"4 i4 ii,A , ,.}.� , p�r4v.rna{ ♦ { ^ vq ry i4 w iiv 6 r.'x }iYV Cf!6]�-0�••yrp <br /> a.,ti.J^w...4,...,.:Y,.wcw.�u3w.» <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GC080395BTEX2IA GCO80395BTEX21A GC080395BTEX2IA GCO80395BTEX21A <br /> AnaIy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst J Minkel J Minkel J Minkel J Minkel <br /> MS/MSD#. 9507J4801 9507J4801 9507J4801 9507J4801 <br /> Sample Conc ND N D N D N D <br /> Prepared Date 8/3/95 8/3/95 8/3/95 8/3/95 <br /> Analyzed Date 8/3/95 8/3/95 8/3/95 8/3/95 <br /> Instrument LD # GCHP21 GCHP21 GCHP21 GCHP21 <br /> Conc. Spiked 10pg/L 10pg/L 10pg/L 30pg/L <br /> Result 8 3 8 7 8 2 25 <br /> eyS %Recovery 83 87 82 83 <br /> Dup. Result 74 73 72 22 <br /> MSD % Recov 74 73 72 73 <br /> RPD 11 18 13 13 <br /> RPD Limit 0-50 0-50 0-50 0-50 <br /> 1�sv � . yr n n w r r v ,ry rr w vi , n r;`^r v vrv, v � { 4 • � 4 v` n r rwnvx r H1H rv^, ` iihrl1y5 <br /> LCS ,# <br /> Prepared Date <br /> Analyzed Date <br /> Instrument i.D # <br /> Conc. Spiked <br /> LCS Result <br /> LCS % Recov <br /> LCS 71-133 72-128 72-130 71-120 <br /> Control Limits <br /> Please Note <br /> The LCS is a control sample of known,interferent4ree matrix that is analyzed using the same reagents, <br /> is NALYTICAL 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 H <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 /> f e Gregory <br /> Project Manager "•MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9508004 GET <2> <br />