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SMITH - EMERY CObtPANY <br /> Tht Full Sen,rct Ir1dt 1a ndt W I t stir-`: bilwwory E,lahle,ht d 1904 <br /> 781 East Washington Boulevard ! Los Angeles California 90021 • (2131749 3411 • Fax (213►746-7228 <br /> P O Box 880550 Hunter s Point Shepard Bldg 114 • San Francisco California 94188 • (415)330 3000 • Fax (415)330-3030 <br /> 5427 Eavt La Palma Avenue • Anahelrn California 92807 • (714)693 1026 • Fax 1714)693 1034 <br /> June 16, 1994 <br /> Quality Control Report <br /> Matrix Spike and Duplicate Spike <br /> Client Thrifty Oil Co <br /> File No 72539 <br /> Report No 41611329 <br /> Matrix Water <br /> Method EPA 602/8015 <br /> Lab No 4159160312 <br /> Batch No 4164602-1 <br /> Date Analyzed 06/13/94 <br /> SPIKE <br /> SAMPLE AMOUNT AMOUNT RECOVERY <br /> RESULTS SPIKED RECOVERED ACCEPTANCE <br /> PARAMETER (ug/1) —(ug/l (u /1) % REG RANGE(%) R P D <br /> Benzene (S) ND 6 8 7 5 110 <br /> Benzene (DS) ND 6 8 7 3 107 77-120 3% <br /> Toluene (S) ND 6 8 7 2 106 <br /> Toluene (DS) ND 6 8 7 2 106 75-115 <1% <br /> Ethyl Benzene (S) ND 6 8 7 3 107 <br /> Ethyl Benzene (DS) ND 6 8 7 3 107 60-130 <1% <br /> Xylene (S) ND 20 4 23 4 115 <br /> Xylene (DS) ND 20 4 23 4 115 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 CLICNTS AUTHORIZATtON 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 />