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11 <br /> SMITH--EMERY COMPANY <br /> The Full Service Independent Testing Laboratory Estabhshed I904 <br /> 781 East Washington Boulevard • Los Angeles Caltfornra 90021 • (213)749 3411 • Fax (213)746 7228 <br /> i� <br /> PO Box 880550 Hunters Point Shipyard Bldg 114 • San Francisco California 94188 • (415)330-3000 • Fax (415)330 3030 <br /> 5427 Ea st La Pa lma Avenue • Anaheim talrfornra92807 • (714)693 1026 • Fax (714)693 1034 <br /> May 20, 1994 <br /> jl <br /> Quality Control Report <br /> Matrix Spike and Duplicate Spike <br /> 1 <br /> E <br /> Client Thrifty Oil Co <br /> t <br /> File No 72537 <br /> Report No 41160928 <br /> Matrix Sail <br /> Method EPA 8020 <br /> Lab No 4116150519 <br /> Batch No 41228020-1 <br />]r, DATE ANALYZED 05/02/94 <br /> SPIKE <br />}i SAMPLE AMOUNT AMOUNT RECOVERY <br /> II RESULTS SPIKED RECOVERED ACCEPTANCE <br /> PARAMETERu k (ug/kg) (ug/kg) % REC RANGE MR P D <br /> Benzene (S) ND 100 110 110 <br /> � Benzene (DS) ND 100 109 109 70-130 1% <br /> Toluene (S) ND 100 109 109 <br />'t Toluene (DS) ND 100 108 108 70-120 1% <br /> �I <br /> Ethyl Benzene (S) ND 100 107 107 <br /> ' Ethyl Benzene (DS) ND 100 106 106 60-130 1% <br /> Xylene (S) ND 300 333 ill <br />�f Xylene (DS) ND 300 329 110 50-130 1% <br /> r� <br /> ] <br /> S = Spike <br /> DS = Duplicate Spike <br /> R P D = Relative Percent Difference <br /> ND = None Detected <br /> r li <br /> i <br /> ALL REPORTS ARE SUBMITTED AS THE CONFIDENTIAL PROPERTY OFCLIENTS AUTHORIZATION FOR PUBLICATION OF OUR REPORT CONCLUSIONS OR t:X <br /> 1 TRACTS FROM OR REGARDING THEM IS RESERVED PENDING OUR WRITTEN APPROVALASA MUTUAL PROTECTION TO CLIENTS THE PUBLIC AND OURSELVES <br />