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1 i <br /> Environmental Laboratory of the Pacific <br /> M Qcaanlc +1 LYayray <br /> 930 Mapunapuna 5treet,Suite 100 Honolulu,Hawaii.96819 <br /> Telephone-(808)831-3090 Fax (808)631-3098 E-mail ELPacific®oceanic-labacom <br /> Laboratory Report <br /> Sequoia Analytical Client Project 1D Unocal, 9809909 <br /> 684 Chesapeake Dr Matrix Water <br /> Redwood City, CA 94063 <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# GCO92298 GC092298 GCO92298 GCO92298 GCO92298 <br /> 802004A 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# 98090479 98090479 98090479 98090479 - <br /> Samp Cone (pg/L) N D N D N D N D - <br /> Prepared Date 09/22/98 09/22/98 09/22/98 09/22/98 - <br /> Analyzed Date 09/22/98 09/22/98 09/22/98 09/22/98 - <br /> Instrument I D# GC-4 GC-4 GC-4 GC-4 - <br /> Cone Spiked(lig/L) 20 20 20 60 - <br /> Result(liglL) 16 17 18 53 - <br /> MS% Recovery 80 85 91 88 - <br /> Dup Result(pg1L) 17 18 20 57 <br /> MSD%Recov 85 91 99 95 <br /> RPD 61 63 79 80 - <br /> RPD Limit 0-25 0-25 0-25 0-25 - <br /> LCS# LCS092298 LCS092298 LCS092298 LCS092298 LCS092298 <br /> Prepared Date 09/22/98 09/22/98 09/22/98 09/22/98 09/22/98 <br /> Analyzed Date 09/22/98 09/22/98 09/22198 09/22/98 09/22/98 <br /> Instrument I D# GC-4 GC-4 GC-4 GC-4 GC-4 <br /> Cone Spiked(pg/L) 20 20 20 60 500 <br /> LCS Result(pglL) 17 18 20 56 447 <br /> LCS%Recov 84 90 98 93 89 <br /> MSIMSo 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 LP IC 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 matnx 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 /> Ai an J <br /> LP <br /> "MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative% Difference <br /> roject Manager <br /> 9809127 sea <4> <br />