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Sequoia 680 Chesapeake Dave 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 /> �I — Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> 010S Services Client project Ib Unocal #6981, 4707 Pacific Ave, Stockton <br /> 2401 Stanwell Or, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Jarrel Crider QC Sample Group 7101203-210 Reported Oct 31, 1997 <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 Newcomb D Newcomb D Newcomb D Newcomb <br /> MS/MSD <br /> Batch# 7101700 7101700 7101700 7101700 <br /> Date Prepared 10/24/97 10/24/97 10/24/97 10/24/97 <br /> Date Analyzed 10/24/97 10/24/97 10/24/97 10/24/97 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 <br /> Conc Spiked 20lig/L 20,ug/L 20pg/L 60pg/L <br /> Matrix Spike <br /> % Recovery 95 95 90 97 <br /> • Matrix Spike <br /> Duplicate % <br /> Recovery 95 95 95 98 <br /> Relative % <br /> Difference 00 00 54 1 7 <br /> LCS Batch# 4LC8102497 4LCS102497 4LCS102497 4LCS102497 <br /> Date Prepares! 10/24/97 10/24/97 10/24/97 10/24/97 <br /> Date Analyzed 10/24/97 10/24/97 10/24/97 10/24/97 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 <br /> LCS % <br /> Recovery 100 95 90 97 <br /> % Recovery <br /> Control Limits 70-130 70-130 70-130 70-130 <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 /> eature 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 recoveryis to be used to validate the batch <br />' <br /> Project Manager <br /> 7101203 MPD <12> <br /> R�` <br />