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COLUMBIA ANALYTICAL SERVICES,INC <br /> QAIQC Report <br /> Client ARCO Products Company Service Request L9901977 , <br /> Project WA#24406 0016020-Manteca Date Collected NA <br /> Sample Matrix Soil Date Received NA <br /> Date Extracted NA <br /> Date Analyzed 5/1199 <br /> Matrix Spike/Duplicate Matrix Spike Summary <br /> Oxygenates <br /> Sample Name T-2-S(16') - Units ug(Kg(ppb) - <br /> Lab Code L9901977-0O1MS, L9901977-OOlDMS Basis Wet <br /> Test Notes <br /> Percent Recovery , <br /> CAS Relative <br /> Prep Analysis Spike Level Sample Spike Result Acceptance Percent Result <br /> Analyte Method Method MRL MS DMS Result MS DMS MS DMS Limits Difference Notes <br /> Benzene EPA 5030 8260 0 5 100 100 ND 114 114 114 114 66-142 <1 <br /> Toluene EPA 5030 8260 0 5 100 100 ND 13 3 14 8 133 148 59-139 10 A4 <br /> Ethylbenzene EPA 5030 8260 _ 05 100 100 ND 116 12 0 116 120 60-130 3 <br /> A4 Outside of acceptance limits The LCS was acceptable,therefore,data was approved <br /> I y � <br /> Approved By Date r <br /> Emswo597p Page No <br /> 01977VOA HW I DMS N4" <br />