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e- 4 l) Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364-9600 FAX(415) 364 9233 <br /> 404 N Wiget lane Walnut Creek,CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> woAnalytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> *prealian rmngineering, Inc Client Project ID Unocal #5098,-5606 Pacific Ave , Stockton <br /> 2401 Stanwell Dr, Ste 400 Matrix Solid <br /> Concord, CA 94520 <br /> Attention Dennis Royce QC Sample Group 5112083-095 Reported Dec 6, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xyfenes <br /> Benzene <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst K Nill K Nill K Nill K Nill <br /> MS/MSD <br /> Batch# M6120095 MS120095 MS120095 MS120095 <br /> Date Prepared 12/2/95 12/2/95 12/2/95 12/2/95 <br /> Date Analyzed 12/2/,95 12/2/95 12/2/95 12/2/95 <br /> Instrument I D # Hf-2 HP-2 HP 2 HP-2 <br /> Conc Spiked 0 40 mg/kg 0 40 mg/kg 0 40 mg/kg 1 2 mg/kg <br /> Matrix Spike <br /> %Recovery, 108 105 110 109 <br /> • Matrix Spike <br /> Duplicate % <br /> Recovery 108 105 110 108 <br /> Relative % <br /> Difference 00 00 00 0 77 <br /> LCS Batch# 2LCS120295 2LCS120295 2LCS120295 2LCS120295 <br /> Date Prepared 12/2/95 12/2/95 12/2/95 12/2/95 <br /> Date Analyzed 12/2/95 12/2/95 12/2/95 12/2/95 <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 <br /> LCS % <br /> Recovery 116 113 117 117 <br /> ecovery <br /> Control Limits 55-145 47-149 47-155 56-140 <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 /> Ala kep <br /> interference,the LCS recovery is to be used to validate the batch <br /> Project Manager <br /> 5112073 KEI <6> <br />