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5)14 Sequoia 680 Chesapeake Dnve 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 /> 1IW Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> IMP08 Services Client Project 1D Unocal #5098, 5606 Pacific Ave , Stockton <br /> 2401 Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Jarrel Crider OC Sample Group 7091413-420 Reported Oct 8, 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# 7091419 7091419 7091419 7091419 <br /> Date Prepared 9/29/97 9/29/97 9/29/97 9/29/97 <br /> Date Analyzed 9/29/97 9/29/97 9/29/97 9/29/97 <br /> Instrument I D # HP-5 HP-5 HP 5 HP 5 <br /> Conc Spiked 20 ug/L 20ug/L 20 pg/L 60 ug/L <br /> Matrix Spike <br /> % Recovery 95 95 90 93 <br /> . Matrix Spike <br /> Duplicate% <br /> Recovery 95 90 90 93 <br /> Relative % <br /> Difference 0 0 5 4 0 0 0 0 <br /> LCS Batch# 5LCS092997 5LCS092997 5LCS092997 5LC6092997 <br /> Date Prepared 9/29/97 9/29/97 9/29/97 9/29/97 <br /> Date Analyzed 9/29/97 9/29/97 9/29/97 9/29/97 <br /> Instrument I D # HP-5 HP 5 HP 5 HP 5 <br /> LCS % <br /> Recovery 90 90 90 92 <br /> % ecovery <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 /> signature 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 /> 7091413 MPD c8> <br /> PD <br />