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Vy <br /> ' Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (415) 364-9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 989 9600 FAX(510) 988 9673 <br /> %-0 Analytical 819 Striker Avenue,Suite 8 Sacramento, CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> IDM <br /> PDS Services Client Project ID Unocal #6981, 4707 Pacific Ave ,Stockton <br /> 2401 Stanwell Dr , Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Jarrel Crider QC Sample Group 5102461-471 Reported Nov 15, 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 M Creusere M Creusere M Creusere M Creusere <br /> MS/MSD <br /> Batch# 5102186 5102186 5102186 5102186 <br /> Date Prepared 11/8/95 11/8/95 11/8/95 11/8/95 <br /> Date Analyzed 11/8/95 11/8/95 11/8/95 11/8/95 <br /> Instrument I D # HP-4 HP-4 HP 4 HP-4 <br /> Conc Spiked 20 yg/L 20 pg/L 20 Ng/L 60 jug/L <br /> Matrix Spike <br /> % Recovery 100 100 100 98 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 100 100 100 100 <br /> Relative % <br /> Difference 00 00 00 17 <br /> LCS Batch# 2LCS110895 21-CS110895 2LCS110895 2LCS110895 <br /> Date Prepared 11/8/95 11/8/95 11/8/95 11/8/95 <br /> Date Analyzed 11/8/95 11/8/95 11/8/95 11/8/95 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 <br /> LCS % <br /> Recovery 95 97 97 98 <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, 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 /> Ognature on File the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> Alan B Kemp interference,the LCS recovery is to be used to validate the batch <br /> Project Manager <br /> 5102461 MPD <7> <br />