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� Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N W,,ct Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> a- ) <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento, CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> 4tPD8 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 OC 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# 5102187 5102187 5102187 5102187 <br /> Date Prepared 11/7/95 11/7/95 11/7/95 11/7/95 <br /> Date Analyzed 11/7/95 11/7/95 11/7/95 11/7/95 <br /> Instrument I D # HP-5 HP-5 HP-5 HP-5 <br /> Cone Spiked 20 ug/L 20 ug/L 20 Ng/L 60 ug/L <br /> Matrix Spike <br /> % Recovery 90 90 90 92 <br /> . Matrix Spike <br /> Duplicate % <br /> Recovery 95 90 90 93 <br /> Relative % <br /> Difference 54 00 00 1 8 <br /> LCS Batch# 3LCS110795 3LCS110795 3LCS110795 3LCS110795 <br /> Date Prepared 11/7/95 11/7/95 11/7/95 11/7/95 <br /> Date Analyzed 11/7/95 11/7/95 11/7/95 11/7/95 <br /> Instrument I D # HP-5 HP-5 HP 5 HP-5 <br /> LCS % <br /> Recovery 81 85 88 89 <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 /> 019nature 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 /> 5102461 MPD a4> <br />