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SMITH—EMERY COMPANY <br /> Thi Full Serntce Independent TLstlnu LaborntorU Establlahed 1904 <br /> 781 East Washington Boulevard • Las Angeles Cal,fomia 90021 • (213)749 3411 • Fax (213)746-7228 <br /> P 0 Box 880550 Hunter s Point Shipyard Bldg 114 • San Francisco California 93188 • (415)330 3000 • Fax (415)330-3030 <br /> 5427 East La Palma Avenue • Anaheim California 92807 • (714)693 1026 • Fax (714)693 1034 <br /> August 22, 1994 <br /> Quality Control Report <br /> Matrix Spike and Duplicate Spike <br /> Client Thrifty Oil Co <br /> File No 72537 <br /> Report No 42281016 <br /> Matrix Water <br /> Method EPA 602/8015 <br /> Lab No 4229165834 <br /> Batch No 4230602-1 <br /> Date Analyzed 08/18/94 <br /> SPIKE <br /> SAMPLE AMOUNT AMOUNT RECOVERY <br /> RESULTS SPIKED RECOVERED ACCEPTANCE <br /> PARAMETER (Us/I)_ (up-/l Z _ (ug/l) % REC RANGE X RRP D <br /> Benzene (S) ND 4 5 4 22 94 <br /> Benzene (DS) ND 4 5 4 16 92 77-120 1% <br /> Toluene (S) ND 4 5 4 38 97 <br /> Toluene (DS) ND 4 5 4 35 97 75-115 <1% <br /> Ethyl Benzene (S) ND 4 5 4 20 93 <br /> Ethyl Benzene (DS) ND 4 5 4 21 94 60-130 <1% <br /> Xylene (S) ND 13 5 14 53 108 <br /> Xylene (DS) ND 13 5 14 50 107 50-130 <1% <br /> S — Spike <br /> DS — Duplicate Spike <br /> R P D — Relative Percent Difference <br /> ND — None Detected <br /> ALL REPORT$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 />