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Sequoia X80 Chesapeake Dnve Redwood City CA 94060 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N 110get Lane Walnut Creek,CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Stnker Avenue,SULM 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> jnn H n is v k n . n <br />' MPDS Services -Client Project ID Unocal #0123, 1034 Central Ave,Tracy <br /> 2401 Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Sarkis Karkarlan QC Sample Group 5060155-57 Reported Jun 19, 1995 ' <br />' QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes Diesel Oil & <br />' Benzene Grease <br /> Method: EPA 8020 EPA 8020 EPA 6020 EPA 6020 EPA 8015M SM 5520 <br /> Analyst J Fontecha J Fontecha J Fontecha J Fontecha J Dinsay D Newcomb <br /> MS/MSD <br /> Batch#- 5060224 5060224 5060224 5060224 BLK060795 BLK060895 <br /> Date Prepared 6/7/95 6/7/95 6/7/95 6/7/95 6/7/95 6/8/95 <br /> Date Analyzed 6/7/95 6/7/95 6/7/95 6/7/95 6/7/95 6/9/95 <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 HP-3A Manual <br />' Cone Spiked 20pg/L 20pg/L 20pg/L 60pg/L 300,ug/L 5000 mg/L <br /> Matrix Spike <br /> % Recovery 115 115 120 122 65 93 <br /> Matrix Spike <br />' Duplicate% <br /> Recovery 115 115 120 122 60 90 <br /> Relative % <br /> A J Difference oo 00 00 00 80 32 M1 v V <br />' LCS Batch# 1LCSM0795 1LCS050795 1LCSD60795 1LCS060795 BLK060795 BLK060895 <br /> Date Prepared 6/7/95 6/7/95 6/7/95 6/7/95 6/7/95 6/8/95 <br /> Date Analyzed 6/7/95 6/7/95 6/7/95 6/7/95 6/7/95 6/9/95 <br /> Instrument I D #. HP-2 HP-2 HP-2 HP-2 HP-3A Manual <br /> LCS % <br /> Recovery 113 114 123 120 65 93 <br />' % Recovery <br /> Control Limits 71-133 72-128 72-130 71-120 38-122 75-125 <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 ff <br /> Signature on t=ile 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 5060155 MPD <7> <br /> I - <br /> r� - <br />