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Sequoia 404 N WiSet Lane <br /> Walnut Geek,CA 94598 <br /> (9ZS)988-96 <br /> Analytical FAX(M)98&9667733 <br /> Gettler-Ryan-Dublin Client Project Ip Tosco S8#6981, Stockton <br /> i <br /> 6747 Sierra Court, Suite J Matrix Liquid <br /> Dublin, CA 94568 <br /> _= Attention Deanna Harding OC Sample Group 9071230-243— _ _ Reported = Aug-4, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes MTBE <br /> Benzene <br /> Method' EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8260 <br /> Analyst C Westwater C Westwater C Westwater C Westwater N Nelson <br /> MS/MSD <br /> Batch# 9071224 9071224 9071224 9071224 9071243 <br /> Date Prepared 7/26/99 7/26/99 7/26/99 7/26/99 7/29/99 <br /> Date Analyzed 7/26/99 7/26/99 7/26/99 7/26/99 7/30/99 <br /> Instrument I D# HP-2 HP-2 HP-2 HP-2 GC/MS-2 <br /> Conc Spiked 20u9/L 20pg/L 20yg/L 60Ng/L 50Ng/L <br /> Matrix Spike <br /> % Recovery 100 90 95 102 124 <br /> Matrix Spike • <br /> Duplicate % <br /> Recovery 95 90 95 98 128 <br /> Relative% <br /> Difference 51 00 00 33 32 <br /> LCS Batch# 2LCS072699 2LCS072699 2LCS072699 2LCS072699 LCS072999 <br /> Date Prepared 7/26/99 7/26/99 7/26/99 7/26/99 7/29/99 <br /> Date Analyzed 7/26/99 7/26/99 7/26/99 7/26/99 7/29/99 Cr, <br /> Instrument I D # HP-2 HP 2 HP 2 HP 2 GC/MS-2 <br /> --i <br /> 1 �ti <br /> ,a <br /> LCS % J <br /> Recovery 100 95 95 107 92 <br /> Recovery <br /> Control Limits 70-130 70-130 70-130 70 130 70-130 <br /> Please Note <br /> The LCS is a control sample of known,rnterferent 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 recoveryis to be used to validate the batch <br /> Ilanne Fegley <br /> Project Manager <br /> 9071230 GET <19> <br />