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1:1) 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 /> IIF Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> 0apreallan E�ngtneering, 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 Xylenes <br /> Benzene <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst K Nill K Nill K Nill K Nil] <br /> MS/MSD <br /> Batch# MS120295 MS120295 MS120295 M6120295 <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-5 HP 5 HP-5 HP-5 <br /> Conc Spiked 0 40 mg/kg 0 40 mg/kg 0 40 mg/kg 1 2 mg/kg <br /> Matrix Spike <br /> % Recovery 98 95 95 97 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 93 90 90 93 <br /> Relative% <br /> Difference 53 54 54 35 <br /> LCS Batch#- 3LCS120595 3LCS120595 3LCS120595 3LCS120595 <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-5 HP-5 HP-5 HP-5 <br /> LCS % <br /> Recovery: 89 87 88 90 <br /> Recovery <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 /> interference,the LCS recovery is to be used to validate the batch <br /> MAN Ke <br /> Project Manag r <br /> 5112073 KEI <7> <br />