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' Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650) 364 9600 FAX(654)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX (510)988 9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> MPDS Services Client Project ID Unocal #0123, 1034 Central Ave , 7racy <br /> 2401 Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Jarrel Crider QC Sample Group 7120369-372 Reported Dec 23, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes Diesel <br /> Benzene <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M <br /> Analyst K Nill K Nill K Nil] K Nill K Grubb <br /> MS/MSD <br /> Batch# 7120371 7120371 7120371 7120371 BLK120997 <br /> Date Prepared 12/9/97 12/9/97 12/9/97 12/9/97 12/9/97 <br /> Date Analyzed 12/9/97 12/9/97 12/9/97 12/9/97 12/9/97 <br /> Instrument I D # HP-2 HP 2 HP-2 HP-2 HP-313 <br /> Conc Spiked 20Ng/L 20 jig/L 20pg/L 60 jig/L 500 Ng/L <br /> Matrix Spike <br /> Recovery 125 130 135 138 54 <br />. Matrix Spike <br /> Duplicate% <br /> Recovery 125 130 135 137 61 <br /> Relative% <br /> Difference 00 00 00 1 2 12 <br /> LCS Batch# 2LCS120997 2LCS120997 2LCS120997 2LCS120997 LCS120997 <br /> Date Prepared 12/9/97 12/9/97 12/9/97 12/9/97 12/9/97 <br /> Date Analyzed 12/9/97 12/9/97 12/9/97 12/9/97 12/9/97 <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 HP-36 <br /> LCS % <br /> Recovery 110 115 115 120 63 <br /> Recovery <br /> Control Limits 60-140 60-140 60-140 60-140 50-150 <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 /> SISignature on File 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 /> Alan 6 Kemp <br /> Project Manager <br /> 7120369 MPD <9> <br />