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404 N Wiget*Lar,,, 4, <br /> Sequoia Walnut Creek CA 94598 <br /> //�� •- - - - - - — - - — - -- — -- (925)988-9600 - <br /> L711a� FAX(925)98&9673 <br /> Gettler-Ryan- Dublin Client Project lb + Unocal #5886, Stockton <br /> 6747 Sierra Court, Suite J Matrix Liquid <br /> 17ublln, CA 94568 <br /> Attention Deanna Harding _ QC Sample Group_908373 _ Reported__ Sep 14, 1999 _ <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> OC Batch#: GCO82799 GCO82799- GCO82799 =GCO82799 - <br /> 802002A 802002A 802002A 802002A <br /> Analy Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method. EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst, C Westwater C Westwater C Westwater C Westwater <br /> MS/MSD#: 90832103 90832103 90832103 90832103 <br /> Sample Conc : N D NO N D N D <br /> Prepared Date: 8/27/99 8/27/99 8/27/99 8/27/99 <br /> Analyzed Date- 8/27/99 8/27/99 8/27/99 8/27/99 <br /> Instrument I D #- HP-2 HP-2 HP-2 HP-2 <br /> Cone Spiked 20jrg/L 20u9/L 20gg/L 60li9/L <br /> Result <br /> MS % Recovery* <br /> Dup Result <br /> MSD % Recov . <br /> RPD <br /> RPD Limit. <br /> LCS # 2LCS082799 2LCS082799 2LCS082799 2LCS082799 <br /> Prepared Date 8 27/99 8/27/99 8/27/99 8/27/99 <br /> Analyzed Date 8 27/99 8/27/99 8/27/99 8/27/99 <br /> Instrument I D # HP 2 HP 2 HP 2 HP 2 <br /> Cone Spiked 20ltg/L 20pg/L 20pg/L 60uq/L <br /> LCS Result 20 18 21 63 <br /> LCS% Recov 100 90 105 105 <br /> LCSD Result. 20 18 18 61 <br /> LCSD% Recov • 100 90 90 102 <br /> LCS 70-130 70-130 70-130 70-130 <br /> Control Limits <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 /> the recovery of analytes from the matrix spike does not fall within specified control limas due to matrix . <br /> interference the LCS recovery is to be used to validate the batch <br /> ulianne Fegley *'MS=Matrix Spike MSO=MS Duplicate,RPD=Relative%Difference <br /> Project Manager <br /> W908373 GET <5> <br />