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SMITH - EMERY COMPANY <br /> Tilt I tell 51 mic L ihtdt lt(mit W Fsttll� l abwahu t/ 1,lablr,11-1 7904 <br /> 781 F-Iyt Washln(,ton Houluard • LusAn),LIv, California 90021 • (213)749 3411 • Fax (213)746 7226 <br /> PO 13ux880550 HuntLr s Point Shlpy-ird Bldg l l4 • San Francisco Cahfornrn 94188 • (415)330 3000 • Fax (415)330 3030 <br /> 1 54271 ast La palma Avtnul • Anaht Im Cahfornm 92807 • (714)693 1026 • Fax (714)693 1034 <br /> March 16, 1994 <br /> Quality Control Report <br /> Matrix Spike and Duplicate Spike <br /> Client Thrifty Oil Co <br /> File No 72539 <br /> Report No 40681726 <br /> Matrix Water <br /> Method EPA 602/8015 <br /> Lab No 4063185803 <br /> Batch No 4069602/8015-1 <br /> Date Analyzed 03/10/94 <br /> SPIKE <br /> SAMPLE AMOUNT AMOUNT RECOVERY <br /> RESULTS SPIKED RECOVERED ACCEPTANCE <br /> PARAMETER (ugfl) (ug/_1)- _(UR/1)— % REC RANGEM - R P D <br /> Benzene (S) ND 11 4 9 1 79 <br /> Benzene (DS) ND 11 4 8 5 75 77-120 6% <br /> Toluene (S) ND 11 4 8 9 78 <br /> Toluene (DS) ND 11 4 8 4 74 75-115 6% <br /> Ethyl Benzene (S) ND 11 4 9 1 80 <br /> Ethyl Benzene (DS) ND 11 4 8 6 75 60-130 6X <br /> Xylene (S) ND 34 2 26 0 77 <br /> Xylene (DS) ND 34 2 25 0 72 50-130 6% <br /> S - Spike <br /> DS 4 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 WRITTEN APPROVAL AS A MUTUAL PROTECTION TO CLIENTS THE PUBLIC AND OURSELVES <br />