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SMITH— EMERY COMPANY <br /> Tire Full Sermce Independent TititrnE> Laboratory Established 1904 <br /> 781 East Washington Boulevard • LosAngeles Callfomia90021 a (213)749 3411 • Fax (213)746,-7228 <br /> P 0 Box 880550 Hunter s Point Shipyard Bldg 114 a San Francisco Calllomia 94188 • (415)330 3000 • Fax (415)330 3030 <br /> 5427 East La Palma Avenue • Anaheim California 92807 • (714)693-1026 • Fax (714)6931034 <br /> August 24, 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 4230113802 <br /> Batch No 4324602-1 <br /> Date Analyzed 08/22/94 <br /> SPIKE <br /> SAMPLE AMOUNT AMOUNT RECOVERY <br /> . RESULTS SPIKED RECOVERED ACCEPTANCE <br /> PARAMETER (ug/1) (up-/I) (ug/1) % REG RANGE(%) RiP D- <br /> Benzene (S) ND 6 8 6 48 95 <br /> Benzene (DS) ND 6 8 6 49 95 77-120 <1% <br /> Toluene (S) ND 6 8 6 44 95 <br /> Toluene (DS) ND 6 8 6 47 95 75-115 <1% <br /> Ethyl Benzene (S) ND 6 8 6 28 92 <br /> Ethyl Benzene (DS) ND 6 8 6 27 92 60-130 <1% <br /> Xylene (S) ND 20 4 20 45 100 <br /> Xylene (DS) ND 20 4 20 43 100 50-130 QX <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 CLIENTS AUTHORIZATION FOR PUBLICATION OF OUR REPORT CONCLUSIONS OR EX <br /> TRACTS FROM OR REGARDING THEM IS RESERVED PENDING OUR WRITTEN APPROVAL AS AMUTUAL PROTECTION TO CLIENTS THE PUBLIC AND OURSELVES <br />