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404 N Wiget Lane <br /> Sequoia Walnut Creek, CA 94598 <br /> (925)988-9600 <br /> Analytical FAX(925)988-9673 <br /> er-iyan= bubhri -- Client Protect jD Unocal 45886, Stockton <br /> 47 Sierra Court, Suite J Matrix Liquid <br /> "Dublin, 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 /> QC Batch# GC082799 GCO82799 GCO82799 GCO82799 <br /> 802005A 802005A 802005A 802005A <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/MS0 # 90837112 90837112 90837112 90837112 <br /> Sample Conc N D N D 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 8/277/99 8/27/99 8/27/99 <br /> Instrument I D.# HP-5 HP-5 HP 5 HP-5 <br /> Conc Spiked 20 Ng/L 20 pg/L 20 ug/L 60 Mg/L <br /> Result 20 20 20 63 <br /> MS%Recovery 100 100 100 105 <br /> I <br /> Dup Result 21 21 21 65 <br /> SD % Recov 105 105 105 108 <br /> RPD 49 49 49 31 <br /> RPD Limit 0-20 0-20 0-20 0-20 <br /> LCS # 5LCS082799 5LC3082799 5LCS082799 5LCS082799 <br /> Prepared Date. 8/27/99 8/27/99 8/27/99 8/27/99 <br /> Analyzed Date 8127/99 8/27/89 8/27/99 8/27/99 <br /> Instrument I D # HP-5 HP 5 HP 5 HP-5 <br /> Conc. Spiked 20pg/L 20ug/L 20fag/L 60Mg/L <br /> LCS Result 23 23 22 70 <br /> LCS % Recov 115 115 110 117 <br /> I <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 limits due to matrix <br /> interference the LCS recovery is to be used to validate the batch <br /> ulianne Fegley '•M =Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference <br /> Project Manager <br /> W908373 GET <6> <br />