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SMITII- EMERY COMPANY <br /> Tht filllStroi(4 irrdeptmicrrf Tt,liwzLfiiornftirrl Z-firf,10htdl9D4 <br /> 781 East Washington Boulevard • LnSAngele% Cdhfomia90021 • (213)749 3411 is Fax (213)746-7228 <br /> PO Bat 880550 Hunter s Point Shipyard Bldg 114 + San Francisco California 94188 • (415y330 3000 • Fax (415)330-3630 <br /> 5427East La Palma Avenue • Anahctm Calttornia 92807 • l734)6931026 • Fax (714)693 1034 <br /> June 21, 1994 <br /> Quality Control Report <br /> Matrix Spike and Duplicate Spike <br /> Client Thrifty Oil Co <br /> File No 72539 <br /> Report No 41611329 <br /> Matrix Water <br /> Method EPA 602/8015 <br /> Lab No 4164132901 <br /> Batch No 4165602-1 <br /> Date Analyzed 06/14/94 <br /> SPIKE <br /> SAMPLE AMOUNT AMOUNT RECOVERY <br /> RESULTS SPIKED RECOVERED ACCEPTANCE <br /> PARAMETER (u (US/1) (US/1) Y REC RANGE(%) R P D <br /> Benzene (S) ND 6 8 5 8 85 <br /> Benzene (DS) ND 6 8 5 7 84 77-120 2% <br /> Toluene (S) ND 6 8 6 3 93 <br /> Toluene (DS) ND 6 8 6 2 91 75-115 2% <br /> Ethyl Benzene (S) ND 6 8 6 1 90 <br /> Ethyl Benzene (DS) ND 6 8 6 2 91 60-130 2% <br /> Xylene (S) ND 20 4 20 8 102 <br /> Xylene (DS) ND 20 4 20 7 101 50-130 Gl% <br /> S — Spike <br /> DS — Duplicate Spike <br /> R P D — Relative Percent Difference <br /> ND — None Detected <br /> ALL REPORTS ARE SUBMITTED AS THE CONFIDENTIAL PROPERTY OF CLIENTS AUTHORIZATION FOR PUBLICATION OF OUR REPORT CONCLUSIONS OR EX <br /> TRACTS FROM OR REGAR41NG THEM IS RESERVED PENDING OUR WRITTEN APPROVAL AS A MUTUAL PROTECTION TO CLIENTS TME PUBLIC AND OURSELVES <br />