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5:411T11 - Em ERY COMPANY <br /> Tin 17rril I;c t t it f ItnigF,mi,tlt 7c�fltt,� (.ItllutahtFU 1 tf?l)lrlit li 1904 <br /> 781 F t,144a,hmi ton l3uult%ard a Loti AnRele% Crltfomla 90021 a (213)749 3411 • Fax (2131 74f.-22S <br /> P O BoX KK ;;0 Hunter s Putnt Shtpvard Bldgs 114 a Sart Francisco Callforma 94189 a (415)73(1 3()0(1 a Fax (41 5)330 mm <br /> 5427 Last La Palmi Atienue a Anahclm Cali tom ta 929[17 a (714)693 102b a Fax (714)693 1034 <br /> June 13 1994 <br /> Quality Control Report <br /> Matrix Spike and Duplicate Spike <br /> Client Thrifty Oil Co <br /> File No 72537 <br /> Report No 41521350 <br /> Matrix Water <br /> Method EPA 602/8015 <br /> Lab No 4157115701 <br /> Batch No 4157602-1 <br /> Date Analyzed 06/06/94 <br /> SPIKE <br /> SAMPLE AMOUNT AMOUNT RECOVERY <br /> RESULTS SPIKED RECOVERED ACCEPTANCE <br /> PARAMETER (u //l) (ug„/l)- due/1) % REC RANGE(%) R P D <br /> Benzene (S) ND 6 8 7 0 104 <br /> Benzene (DS) ND 6 8 7 0 103 77-120 1% <br /> Toluene (S) ND 6 8 7 1 105 <br /> Toluene (DS) ND 6 8 7 1 104 75-115 1% <br /> Ethyl Benzene (S) ND 6 8 7 3 108 <br /> Ethyl Benzene (DS) ND 6 8 7 3 108 60-130 1% <br /> Xylene (S) ND 20 4 22 0 109 <br /> Xylene (DS) ND 20 4 22 0 109 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 SUt3MITTED AS THE CONFIDENTIAL PROPERTY OF CLIENTS AUTHORIZATION FOR PUBLICATION OF OVR 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 />