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Sequoia 680 Chesapeake Dnvc Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek,CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> a) Analytical 819 Sinker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> A- <br /> ' "' <br /> hf v ,aw ,.Ax rcr.vo,N-..&r.r,. <br /> ,Gettler Ryan/GeostrateglesJ Client Proll`ecf fD MUnocaf'SS#V5886 A <br /> ,6747 Sierra Court, Ste J Matrix Liquid <br /> Dublin, CA 94568 x° <br /> `Attention Deanna Harding Work Order# 9803G82-02-04, 09, 10 Reported Apr 15, 1998 < <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GCO40498802009A GCO40498802009A GC040498802009A GCO40498802009A GCO40498802009A <br /> Analy. Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst D Newcomb D Newcomb D Newcomb D Newcomb D Newcomb <br /> MS/MSD # 8032771 8032771 8032771 8032771 8032771 <br /> Sample Cone . N 0 N D N D N D N D <br /> Prepared Date 4/4/98 4/4/98 4/4/98 4/4/98 4/4/98 <br /> Analyzed Date 4/4/98 4/4/98 4/4/98 4/4/98 4/4/98 <br /> Instrument I D # HP9 HP9 HP9 HP9 HP9 <br /> Cone Spiked 20yg/L 20ug/L 20pg/L 60yg/L 370 pg/L <br /> Result 21 23 23 69 370 <br /> MS % Recovery 105 115 115 115 100 <br /> 0 ❑up Result 22 23 23 69 370 <br /> MSD % Recov 110 115 115 115 100 <br /> RPD 47 00 00 00 00 <br /> RPD Limit 0-20 0-20 0-20 0-20 0-50 <br /> LCS # LCSO40498 LCSO40498 LCSO40498 LCSO40498 LCSO40498 <br /> Prepared Date 4/4/98 4/4/98 4/4/98 4/4/98 4/4/98 <br /> Analyzed Date 4/4/98 4/4/98 4/4/98 4/4/98 4/4/98 <br /> Instrument € D # HP9 HP9 HP9 HP9 HP9 <br /> Cone Spiked 20pg/L 20Ng/L 20us/L 60frg/L 370 pg/L <br /> LCS Result 21 23 22 69 370 <br /> LCS %Recov 105 115 110 115 100 <br /> 60-140 60-140 60-140 60-140 60-140 <br /> LCS 70-130 70-130 70-130 70-130 70-130 <br /> Control Limits <br /> Please Note <br /> SEQUOIA ANALYTICAL The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> Elap 127 preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> lrojlectMan�ager <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedu(e If <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 /> rego *'MS=Matrix Spike, MSD=MS Duplicate, RPO=Relative%Difference 98MG82 GET <2> <br />