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SMITH —EmEytY COMPANY <br /> The Full Scrvrce lrrdept rick nt 7estrny Laboratory, Lstahli4wd 1904 <br /> 781 Fast Washington Boulevard • Los Angeles California 90021 s (213)749 3411 • Fax (213)746 7228 <br /> PO Box 880550 Hunter s Point Shipyard Bldg 114 • San Francisco California 94188 • (415)330 3000 • Fax (415)822 5864 <br /> 5427 East La Palma Avenue 6 Anaheim California 92807 • (714)693 1026 • Fax (714)693 1034 <br /> September 17, 1993 <br /> Quality Control Report <br /> Matrix Spike and Duplicate Spike <br /> Client Thrifty oil Co <br /> File No 72528 <br /> Report No 32531116 <br /> Matrix Water <br /> Method EPA 602 <br /> Lab No 3258121102 <br /> Batch No 3258602-1 <br /> SPIKE <br /> SAMPLE AMOUNT AMOUNT RECOVERY <br /> RESULTS SPIKED RECOVERED ACCEPTANCE <br /> PARAMETER (UR/1) (ug/11 (ug/1) % REC RANGE{%) R P,D <br /> Benzene (S) ND 71 74 3 105 <br /> Benzene (DS) ND 68 73 2 108 64-125 3% <br /> Toluene (S) ND 71 72 3 102 <br /> Toluene (DS) ND 68 71 8 106 70-118 4% <br /> Ethyl Benzene (S) ND 71 72 2 102 <br /> Ethyl Benzene (DS) ND 68 71 9 106 70-121 4% <br /> Xylene (S) ND 213 202 95 <br /> Xylene (DS) ND 204 202 99 67-126 4% <br /> S — Spike <br /> DS — Duplicate Spike <br /> R P D o Relative Percent Difference <br /> ND 4 None Detected <br /> ALL REPORTS ARE 508161I7TED AS THE CONFIDENTIAL PROPERTY OF CLIENT5 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 />