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r <br /> SMITH-EMERY COMPANY <br /> The Full Service Independent Testing Laboratory, Established 1904 <br /> 781 East Washington Boulevard • Los Angeles Califomla 90021 • (213)749 3411 • Fax (213)746-7228 <br /> P O Box 8WS50 Hunter s Point 5hipyard Bldg 114 • San Francisco Califomia 94188 • (415)330 3000 • Fax (415)822 5864 <br /> 5427 East La Palma Avenue • Anaheim Cahfomia 92807 • (714)693-1026 • Fax (714)693-1034 <br /> September 23 , 1993 <br /> Quality Control Report <br /> Matrix Spike and Duplicate Spike <br /> i <br /> Client Thrifty Oil Co <br /> File No 72539 <br /> Report No 32571653 <br /> Matrix Water <br /> Method EPA 602 <br /> Lab No 3259203511 <br /> Batch No 3263602-1 <br /> SPIKE <br /> ` SAMPLE AMOUNT AMOUNT RECOVERY <br /> RESULTS SPIKED RECOVERED ACCEPTANCE <br /> PARAMETER (ug/1) (up-/-!) ug/1)— % REC , RANGE(%) R.P D. <br /> Benzene (S) ND 16 14 7 92 <br /> Benzene (DS) ND 16 16 2 101 64-125 9% <br /> Toluene (S) ND 16 14 4 90 <br /> Toluene (DS) ND 16 15 7 98 70-118 9% <br /> Ethyl Benzene (S) ND 16 13 8 86 <br /> Ethyl Benzene (DS) ND 16 15 0 92 70-121 6% <br /> Xylene (S) ND 48 38 78 <br /> Xylene (DS) ND 48 39 82 67-126 4% <br /> I <br /> S - Spike <br /> DS - Duplicate Spike <br />. R P D a 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 WRITTItN APPROVAL AS A MUTUAL PROTECTION TO CLIENTS THE PUBLIC AND OURSEI-VES <br />