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jSequoia 680 Chesapeake Dnve Redwood City CA 94063 (415) 364 9600 FAX (415) 364 92.33 <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 /> sprealian Engineering, Inc Client Project ID Unocal #5098, 5606 Pacific Ave , Stockton <br /> 2401 Stanwell Dr , Ste 400 Matrix Solid <br /> Concord, CA 94520 <br /> Attention Avo Avedlssian QC Sample Group 4070695-718 Reported Jul 29, 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# 4071022 4071022 4071022 4071022 <br /> Date Prepared 7/26/94 7/26/94 7/26/94 7/26/94 <br /> Date Analyzed 7/26/94 7/26/94 7/26/94 7/26/94 <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 <br /> Conc Spiked 0 40 mg/kg 0 40 mg/kg 0 40 mg/kg 1 2 mg/kg <br /> Matrix Spike <br /> % Recovery 90 93 95 95 <br /> • Matrix Spike <br /> Duplicate % <br /> Recovery 95 98 98 100 <br /> Relative% <br /> Difference 54 52 31 51 <br /> LCS Batch# 1 LCS072694 1 LCS072694 1 LCS072694 1 LCS072694 <br /> Date Prepared 7/26/94 7/26/94 7/26/94 7/26/94 <br /> Date Analyzed 7/26/94 7/26/94 7/26/94 7/26/94 <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 <br /> LCS % <br /> Recovery 100 100 100 103 <br /> Recovery <br /> Control Limits 55-145 47-149 47-155 56-140 <br /> Please Note <br /> The LCS is a control sample of known,interferent free matriA that.s analyzed us,ng the same eagents <br /> +SEQUOIA ANYTICAL, #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 /> 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 /> �;I <br /> Ian B Kemp <br /> Project Manager <br /> 4070695 KEI <5> <br />