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r <br /> Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 1900 Sates Avenue Suite L Concord CA 94520 (510) 686 9600 FAX(510)686 9689 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> aPDS Services Client Project ID Unocal #0187, 437 E Miner Ave, Stockton <br /> 01 Stanwell Dr, Ste 400 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Avo Avedissian QC Sample Group 4081469-71 Reported Sep 6, 1994 <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 J Fontecha J Fontecha J Fontecha J Fontecha <br /> MS/MSD <br /> Batch# 4081258 4081258 4081258 4081258 <br /> Date Prepared 8/28/94 8/26/94 8/28/94 8/28/94 <br /> Date Analyzed 8/28/94 8/28/94 8/28/94 8/28/94 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 <br /> Conc Spiked 20yg/L 20ug/L 20ug/L 60pg/L <br /> Matrix Spike <br /> % Recovery 80/ 95 95 100 <br /> is Matrix Spike <br /> Duplicate % <br /> Recovery 85 95 95 98 <br /> Relative% <br /> Difference 61 00 00 2 0 <br /> LCS Batch# 2LCS082894 2LCS082894 2LCS082894 2LCS082894 <br /> Date Prepared 8/28/94 8/28/94 8/28/94 8/28/94 <br /> Date Analyzed 8/28/94 8/28/94 8/28/94 8/28/94 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 <br /> LCS % <br /> Recovery 81/ 98 104 107 <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 spike is an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> 0ignature on File 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 <br /> 4081469 MPD <3> <br />