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4 <br /> 4D) SMITH-EMERY COMPANY <br /> The Full Sen,rce Indepcndent Te,;ting L aboratorit E�tabhshed 1904 <br /> 781 East Washington Boulevard • 1 os Angeles California90021 • (213)749 3411 • Fax f213)746-7228 <br /> P O Box 880550 Hunter s Point Shipvard Bldg 114 • San Francisco California 94188 • (415)330-3000 • Fax 1415)330-3030 <br /> 5427 East La Palma Avenue • Anaheim California 92807 • (714)693 1026 • Fax (714)693 1034 <br /> September 27 , 1994 <br /> Quality Control Report <br /> Matrix Spike and Duplicate Spike <br /> Client Thrifty Oil <br /> File No 72539 <br /> Report No 42521818 <br /> Matrix Water <br /> Method EPA 602/8015 <br /> Lab No 4252113503 <br /> Batch No 4257602/8015-1 <br /> Date Analyzed 09/14/94 <br /> SPIKE <br /> SAMPLE AMOUNT AMOUNT RECOVERY <br /> RESULTS SPIKED RECOVERED ACCEPTANCE <br /> PARAMETER (uz/1) (ug/1) (US/1) --- % REG RANGE % R.P.D <br /> Benzene (S) ND 9 1 8 77 96 <br /> Benzene (DS) ND 9 1 8 77 96 63-137 <1% <br /> Toluene (S) ND 9 1 8 34 92 <br /> Toluene (DS) ND 9 1 8 4 92 65-142 <1% <br /> Ethyl Benzene (S) ND 9 1 8 3 91 <br /> Ethyl Benzene (DS) ND 9 1 8 28 91 56-141 <1% <br /> Xylene (S) ND 27 3 25 67 94 <br /> Xylene (DS) ND 27 3 25 54 94 55-143 <1% <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 CONCLU51ONS OR EX <br /> TRACTS FROM OR REGARDING THEM IS RESERVED PENDING OUR WRITTEN APPROVAL AS A MUTUAL PROTECTION TO CLIENTS THE PUBLIC AND OURSELVES <br />