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l Sequoia <br /> GAO Chesapeake Drive Redwood City CA 44063 (415) 364 4600 FAX(4 f S) 364 9233 <br /> 1400 Bates Avenue Suitc L Concord CA 94520 (510) 686 9600 FAX(510)686 4689 <br /> 819 Striker Avenue Suite 8 Sacramento CA 45834 (916) 921 %00 FAX(916)92,1 0100 <br /> Analytical <br /> Mill Creek Associates Client Project ID Roek Bros Property <br /> P 0 Box 130 Matrix Solid <br /> Milford, CA 96121 <br /> Attention Russell Juncal OC Sample Group 9409A71 -01-8 Reported Sep 30, 1994;; <br /> I <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Diesel Benzene Toluene Ethyl Xylenes � <br /> Benzene <br /> Method EPA 8015 BPA 8020 EPA 8020 EPA 8020 BPA 8020 <br /> Analyst N Herrera R Geckler R Geckler R Geckler R Geckler <br /> MS/MSD <br /> Batch# 9409A7301 940902304 940902304 940902304 940902304 I <br /> Date Prepared 9/26/94 9/26/94 9126/94 9/26/94 9/26/94 <br /> Date Analyzed 9/26/94 9/26/94 9,126/94 9/26/94 9/26/94 <br /> Instrument I D # GCHP-5 GCHP-1 GCHP 1 GCHP 1 GCHP-1 <br /> Conc Spiked 15 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg <br /> Matrix Spike <br /> % Recovery 80 95 95 95 95 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 87 95 95 95 97 <br /> Relative % <br /> Difference, 84 00 00 00 21 <br /> I LCS Batch# <br /> Date Prepared <br /> Date Analyzed <br /> Instrument I D # <br /> LCS % <br /> Recovery <br /> I I <br /> % Recovery <br /> Control Limits 38 122 55 145 47 149 47 155 56-140 <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 preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> I I fortified with known quantities of specific compounds and subjected to the entire analytical procedure 9 <br /> the recovery of analytes from he matrix spike does not fall within specified control limits due to matrix <br /> l S interference,the LCS recovery is to be used to validate the batch <br /> Vickie Tague Clark <br /> Project Manager 9409A71 MMM <1> <br />