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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 /> Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> QPD8 Services Client Project ID Unocal #5098, 5606 Pacific Ave , Stockton <br /> 2401 Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Jarrel Crider QC Sample Group 5122228-235 Reported Jan 12, 1996 <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 D Sharma D Sharma D Sharma D Sharma <br /> MS/MSD <br /> Batch# 5122228 5122228 5122228 5122228 <br /> Date Prepared 1/2/96 1/2/96 1/2/96 1/2/96 <br /> Date Analyzed 1/2/96 1/2/96 1/2/96 1/2/96 <br /> Instrument I D# HP-5 HP-5 HP 5 HP-5 <br /> Conc Spiked 20 ug/L 20 ug/L 20]ug/L 60 ug/L <br /> Matrix Spike <br /> % Recovery 90 90 90 93 <br /> • Matrix Spike <br /> Duplicate % <br /> Recovery 95 95 95 98 <br /> Relative % <br /> Difference 54 54 54 52 <br /> LCS Batch#. 3LCS010296 3LCS010296 3LCS010296 3LCS010296 <br /> Date Prepared 1/2/96 1/2/96 1/2/96 1/2/96 <br /> Date Analyzed 1/2/96 1/2/96 1/2/96 1/2/96 <br /> Instrument I D # HP-5 HP-5 HP-5 HP-5 <br /> LCS % <br /> Recovery 90 95 95 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 /> 5122228 MPD <3> <br />