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,CEnvironmental Laboratory of the pacific <br /> 930 Mapunaptins 5tmet;,5urtc 100 Honolufu Hawari 96819 <br /> Telephone (805)831-3090 Pax(806)831-3098 E-mall ELPacificaoccanrc-lab5.com <br /> Laboratory Report <br /> Sequoia Analytical Client Protect ID Unocal, 9809909 <br /> 680 Chesapeake Dr Matrix Water <br /> Redwood City, CA 94063 r <br /> Attention Tod Granicher Reported Sep 24, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gasoline <br /> Benzene <br /> QC Batch# GC092198 GC092198 GC092198 GC092198 GC092198 <br /> 302004A 802004A 802004A 802004A 802004A <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 SL SL SL SL SL <br /> MS/MSD# 98090442 98090442 98090442 98090442 - <br /> Samp Conc (pg/L) 28 2 5 4 4 8 0 - <br /> Prepared Date 09/21/98 09/21/98 09/21/98 09/21/98 - <br /> Analyzed Date 09/29/98 09/21/98 09/21/98 09/21/98 - <br /> Instrument I D# GC-4 GC-4 GC-4 GC-4 - <br /> Conc Spiked(pg/L) 20 20 20 60 - <br /> Result(pg1L) 40 18 22 59 - <br /> MS%Recovery 57f 79 89 85 _ <br /> Dup Result(pgIL) 44 20 24 64 - <br /> MSD%Recov 79 86 99 93 <br /> RPI} 103 74 87 76 - <br /> RPD Limit 0-25 0-25 0-25 0-25 - <br /> LCS# LCS092198 LCS092198 LCS092198 LCS092198 LCS092198 <br /> Prepared Date 09/21/98 09/21/98 09/21/98 09/21/98 09/21/98 <br /> Analyzed Date 09/21/98 09/21/98 09/21/98 09/21/98 09/21/98 <br /> Instrument I D# GC-4 GC-4 GC-4 GC-4 GC-4 <br /> Conc Spiked(pglL) 20 20 20 60 500 <br /> LCS Result(uglL) 15 16 18 51 415 <br /> LCS% Recov 77 82 89 85 83 <br /> MS/MSD 60-140 60-140 60-140 60-140 <br /> LCS 70-130 70-130 70-130 70-130 60-140 <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 /> E L P IFIC 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 />�-4idan J Scott "MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference <br /> Protect Manager <br /> 9809127 seq 45a <br />