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SMITH-EMERY COMPANY <br /> The Fu!! Service Independent T«fart biboratoru Estahlrshed 1904 <br /> 781 Fast Washington Boulevard • Los Angeles California 90021 • (213)749 3411 • Fax (213)746-7228 <br /> PO 13ox880556 Hunters Point Shipvard Bldg 114 • 5an Francisco Califomia 94188 • (415)330 3000 a Fax (415)334.3030 <br /> 5327 Fast La Palma Avenue • Anaheim California 92807 • (714)693 1026 • Fax (714)693-1034 <br /> August 24, 1994 <br /> Quality Control Report <br /> Matrix Spike and Duplicate Spike <br /> Client Thrifty Oil Co <br /> File No 72537 <br /> Report No 42281016 <br /> Matrix Water <br /> Method EPA 602/8015 <br /> Lab No 4230114902 <br /> Batch No 4321602-1 <br /> Date Analyzed 08/19/94 <br /> SPIKE <br /> SAMPLE AMOUNT AMOUNT RECOVERY <br /> RESULTS SPIKED RECOVERED ACCEPTANCE <br /> PARAMETER (Up-/ ) (ug/1) (up-/l am % REC RANGE(%) R,P.D <br /> Benzene (S) ND 6 8 6 65 98 <br /> Benzene (DS) ND 6 8 6 61 97 77-120 1% <br /> Toluene (S) ND 6 8 6 42 94 <br /> Toluene (DS) ND 6 8 6 44 95 75-115 <1% <br /> Ethyl Benzene (S) ND 6 8 6 37 94 <br /> Ethyl Benzene (DS) ND 6 8 6 37 94 60-130 <1% <br /> Xylene (S) ND 20 4 22 18 109 <br /> Xylene (DS) ND 20 4 22 10 108 50-130 <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 CONCLUSIONS 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 />