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SMITH -EMERY COMPANY <br /> The Ful!Service Independent Testing Laboratory Established 7904 <br /> 781 East WashingtonBoulevard 0 LosAngeles Call OMM90021 0 (213)749 3411 • Fax (213)74(-7228 <br /> PO Bax 880550 Hunters Point Shipyard Bldg 114 • San Francisco Callforma 94188 • (415)330 3000 • Fax (415)822 5864 <br /> 5427 East La Palma Avenue • Anaheim California 92807 0 (714)693 1026 + Fax (714)693 1034 <br /> September 23, 1993 <br /> Quality Control Report <br /> Matrix Spike and Duplicate Spike <br /> Client Thrifty Oil Co <br /> File No 72539 <br /> Report No 32571653 <br /> Matrix Water <br /> Method EPA 602 <br /> Lab No 3259151702 <br /> Batch No 3259602-1 <br /> SPIKE <br /> ' SAMPLE AMOUNT AMOUNT RECOVERY <br /> RESULTS SPIKED RECOVERED ACCEPTANCE <br /> PARAMETER (u&Zl)— (ue/lam (ue/1) _ % REG RANGE(%) _ R P D. <br /> Benzene (S) ND 96 87 9 92 <br /> Benzene (DS) ND 97 87 8 91 64-125 1% <br /> Toluene (S) ND 96 98 6 103 <br /> Toluene (DS) ND 97 95 9 99 70-118 3% <br /> Ethyl Benzene (S) ND 96 115 120 <br /> Ethyl Benzene (DS) ND 97 110 114 70-121 6% <br /> Xylene (S) ND 288 357 124 <br /> Xylene (DS) ND 291 334 115 67-126 7% <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 />