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• Sequoia 680 Chesapeake Drive Redwood Qty,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> Analytical 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510) 988-9673 <br /> 819 Straker Avenue,Suite 8 Sacramento CA 95834 (916) 921-9600 FAX(916) 921 0100 <br /> *PDS Services Client Project ID Unocal #5098, 5606 Pacific Ave , Stockton <br /> 2401 Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Sarkis Karkartan OC Sample Group 5061985-90 Reported Jul 11, 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 A Tuzon A Tuzon A Tuzon A Tuzon <br /> MS/MSD <br /> Batch# 5061988 5061988 5061988 5061988 <br /> Date Prepared 7/2/95 7/2/95 7/2/95 7/2/95 <br /> Date Analyzed 7/2/95 7/2/95 7/2/95 7/2/95 <br /> Instrument I D # HP 2 HP 2 HP-2 HP-2 <br /> Conc Spiked 20 yg/L 20 pg/L 20 pg/L 60 erg/L <br /> Matrix Spike <br /> % Recovery 115 115 120 120 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 115 115 120 120 <br /> Relative % <br /> Difference 00 00 00 00 <br /> LCS Batch# 1 LCS070295 1 LCS070295 1 LCS070295 1 LCS070295 <br /> Date Prepared 7/2/95 7/2/95 7/2/95 7/2/95 <br /> Date Analyzed 7/2/95 7/2/95 7/2/95 7/2/95 <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 <br /> LCS % <br /> Recovery 110 110 116 115 <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 /> nature 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 /> 5061985 MPD <5> <br /> Ma <br />