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4a) 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 /> f wo Analytical 819 Sinker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> *PDS Services Client Project Ib Unocal #2859, 1665 Pacific Ave, Stockton <br /> 2401 Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Sarkis Karkarian QC Sample Group 5050373-381 Reported May 19, 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 N Zahedi N Zahedi N Zahedi N Zahedi <br /> MS/MSD <br /> Batch# 5050207 5050207 5050207 5050207 <br /> Date Prepared 5/12/95 5/12/95 5/12/95 5/12/95 <br /> Date Analyzed 5/12/95 5/12/95 5/12/95 5/12/95 <br /> Instrument I D # HP-1 HP-1 HP-1 HP-1 <br /> Conc Spiked 10pg/L 10pg/L 10pg/L 30ug/L <br /> Matrix Spike <br /> % Recovery 89 90 90 93 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 99 102 101 104 <br /> Relative% <br /> Difference 11 13 12 11 <br /> LCS Batch#' -- <br /> Date <br /> -Date Prepared - -- -- <br /> Date Analyzed -- - <br /> Instrument I D # - -- - <br /> LCS % <br /> Recovery - - - <br /> Recovery <br /> Control Limits 71-133 72-128 72-130 71-120 <br /> Please Note <br /> The LCS is a control sample of known,interferentiree matrix that is analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL, #2000 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 /> Signature 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 B Kemp <br /> Project Manager <br /> 5050373 MPD <4> <br />