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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 1900 Bates 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 /> WPM Services Client Project ID Unocal #6981, 4707 Pacific Ave , Stockton <br /> 2401 Stanwell Dr, Ste 400 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Avo Avedissian QC Sample Group 4101833-845 Reported Nov 11, 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# 4101680 4101680 4101680 4101680 <br /> Date Prepared 11/2/94 11/2/94 11/2/94 11/2/94 <br /> Date Analyzed 11/2/94 11/2/94 11/2/94 11/2/94 <br /> Instrument I D # HP-5 HP-5 HP-5 HP-5 <br /> Cone Spiked 20 ug/L 20 yg/L 20 pg/L 60 Ng/L <br /> Matrix Spike <br /> % Recovery 100 105 105 102 <br /> is Matrix Spike <br /> Duplicate% <br /> Recovery 100 100 105 100 <br /> Relative% <br /> Difference 00 49 00 2 0 <br /> LCS Batch# 3LCS110294 3LCS110294 3LCS110294 3LCS110294 <br /> Date Prepared 11/2/94 11/2/94 11/2/94 11/2/94 <br /> Date Analyzed 11/2/94 11/2/94 11/2/94 11/2/94 <br /> Instrument I D # HP-5 HP-5 HP-5 HP-5 <br /> LCS % <br /> Recovery 99 104 104 102 <br /> Recovery <br /> Control Limns 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 subjc-,ted 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 /> Interference,the LCS recovery is to be used to validate the batch <br /> Alan B Kemp <br /> Project Manager <br /> 4101833 MPD e7> <br />