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n4D 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 /> woAnalytical 819 Striker Avenue Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> 4tP08 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 QC 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 K Noll K Nill K !Voll K Noll <br /> MS/MSD <br /> Batch# 5102182 5102182 5102182 5102182 <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-2 HP-2 HP-2 HP-2 <br /> Conc Spiked 20p91 20,ug/L 20pg/L 60Ng/L <br /> Matrix Spike <br /> % Recovery 110 110 105 110 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 115 110 110 112 <br /> Relative % <br /> Difference 44 0 0 47 1 5 <br /> LCS Batch# 1 LC8110795 1 LCS110795 1 LCS110795 1 LCS110795 <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-2 HP-2 HP-2 HP-2 <br /> LCS % <br /> Recovery 97 100 108 107 <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 spoke is an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> O'griature on File the recovery of analytes from the matrix spoke 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 /> 5102461 MPD ¢5> <br />