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4D 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 /> WoAnalytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> WPD$ Services Client Project Ib Unocal #6981, 4707 Pacific Ave , Stockton <br /> 2401 Stanwell Dr, Ste 400 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Avo Avedissian CC 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# 4110201 4110201 4110201 4110201 <br /> Date Prepared 11/3/94 11/3/94 11/3/94 11/3/94 <br /> Date Analyzed 11/3/94 11/3/94 11/3/94 11/3/94 <br /> Instrument I D.# HP-5 HP-5 HP-5 HP-5 <br /> Conc Spiked 20ug/L 20pg/L 20lig/L 60lig/L <br /> Matrix Spike <br /> % Recovery 95 110 100 98 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 100 105 100 100 <br /> Relative% <br /> Difference 51 4 6 00 2 0 <br /> LCS Batch# 3LCS110894 3LCS110894 3LCS110894 3LCS110894 <br /> Date Prepared 11/3/94 11/3/94 11/3/94 11/3/94 <br /> Date Analyzed 11/3/94 11/3/94 111/3/94 11/3/94 <br /> Instrur>'rent I D # HP-5 HP-5 HP-5 HP-5 <br /> LCS % <br /> Recovery 88 92 90 88 <br /> % Recovery <br /> Control Limits 71-133 72-128 72-130 71-120 <br /> Please Mote <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 /> interference,the LCS recovery is to be used to validate the batch <br /> Alan B Kemp <br /> Project Manager <br /> 4101833 MPD <8> <br />