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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 /> Analytical 819 Sinker Avenue Suite 8 Sacramento, CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> OILS Services Client Project ID Unocal #0187, 437 E Miner Ave ,Stockton <br /> 2401 Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Jarrel Crider QC Sample Group 7080153-160 Reported Aug 19, 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 0 Newcomb <br /> MS/MSD <br /> Batch# 7080072 7080072 7080072 7080072 <br /> Date Prepared- 8/8/97 8/8/97 8/8/97 8/8/97 <br /> Date Analyzed 8/8/97 8/8/97 8/8/97 8/8/97 <br /> Instrument I ❑ # HP-2 HP-2 HP-2 HP-2 <br /> Conc Spiked 20Ng/L 20pg/L 20frg/L 60,ug/L <br /> Matrix Spike <br /> % Recovery 80 100 100 102 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 80 105 95 103 <br /> Relative% <br /> Difference. 00 48 51 1 6 <br /> LCS Batch# 2LCS080897 2LCS080897 2LCS080897 2LCS080897 <br /> Date Prepared 8/8/97 8/8/97 8/8/97 8/8/97 <br /> Date Analyzed 8/8/97 8/8/97 8/8/97 8/8/97 <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 <br /> LCS % <br /> Recovery 85 105 105 105 <br /> Recovery <br /> Control Limits 60-140 60-140 60-140 60-140 <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 /> Oature 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 /> 7080153 MPD e4> <br />