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SMITH-EMERY COMPANY <br /> Tire Frill SerVICC Indeperidenf Testing Laboratory Established I904 <br /> 781 East Washington Boulevard • Los Angeles California 90021 • (213)749-3411 • Fax (213)746-7228 <br /> P O Box 880550 Hunter s Point Shipyard Bldg 114 • San Francisco California 94188 • (415)330 3000 • Fax (415)330-3030 <br /> 5427 East[.a Palma Avenue • Anaheim California 92807 • (714)693-1026 • Fax (714)693 1034 <br /> May 9, 1994 <br /> Quality Control Report <br /> Matrix Spike and Duplicate Spike <br /> Client Thrifty Oil Co <br /> File No 72537 <br /> Report No 41161536 <br /> Matrix Water <br /> Method EPA 602/8015 <br /> Lab No 4116154301 <br /> Batch No 4118602-1 <br /> Date Analyzed 04/28/94 <br /> SPIKE <br /> SAMPLE AMOUNT AMOUNT RECOVERY <br /> RESULTS SPIKED RECOVERED ACCEPTANCE <br /> PARAMETER (u /� (ugh (ug/1) % REG RANGE(%) R P D <br /> Benzene (S) ND 11 4 9 5 83 <br /> Benzene (DS) ND 11 4 9 6 84 77-120 2% <br /> Toluene (S) ND 11 4 10 1 89 <br /> Toluene (DS) ND 11 4 10 4 92 75-115 3% <br /> Ethyl Benzene (S) ND 11 4 10 4 91 <br /> Ethyl Benzene (DS) ND 11 4 10 7 94 60-130 3% <br /> Xylene (S) ND 34 2 32 9 96 <br /> Xylene (DS) ND 34 2 34 1 99 50-130 3% <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 REGARDING THEM 15 RESERVED PENDING OUR WRITTEN APPROVAL ASA MUTUAL PROTECTION TO CLIENTS THE PUBLIC AND OURSELVES <br />