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PMR bond b) Semi-volatile organics (in general, with 29 analytes identified above controls; however the only semi-volatile analytes above controls having criteria for hazardous waste identification are cresols—2-, 3- and 4-m ethyl phenol). c) Fish bioassay toxicity(infrequently, associated with DEN preservatives in a minority of samples). The main results of the statistical characterization of UPRR's rail tie waste classification data are provided in Table 3.2 (following text). In this table, the following values are provided for each analyte and analysis type (solids/TTLC, leachate/TCLP and leachate/STLC): • The number of observations (N) • The percentage on non-detects • The number of individual observations exceeding the applicable regulatory threshold (criterion) • The observed range of values, comprised of the minimum and maximum values • The interpreted data distribution (Distribution), in priority order classified as normal, gamma, lognormal, or not-normal (not following an identifiable data distribution), consistent with the approach in USEPA(2015). • The calculated 90 percent upper confidence limit on the true mean of the population of UPRR's rail tie wastes (90UCL) The findings of the statistical evaluation are discussed by analyte class below. 3.1 Metals The analyses of rail tie waste solids for total metals clearly demonstrate that the sixteen metals analyzed for are not present at concentrations anywhere near their respective TTLC, STLC and TCLP limits. No individual measurements or 90UCLs are above a TTLC limit, and for all metals the maximum detected values in all of the 2315 samples is at least two orders of magnitude below the TTLC limit. This is conclusive evidence that the population of UPRR rail tie waste meets TTLC requirements for metals, and there no need to analyze for metals in wooden rail tie waste samples to be able to conclude that these wastes are non-hazardous for metals. 3.2 Pesticides/PCBs Only in a subset of the rail tie waste samples (39 out of 2315 total)were analyzed for pesticides and PCBs. None of the new rail ties samples were analyzed for pesticides and PCBs (presuming that these are not normally associated with wood preservatives). Analysis of waste ties found that pesticides/PCBs are not present at detectable concentrations in the waste rail ties. The only exception was one sample in which Endrin was detected in the TTLC analysis, but was not present in the TCLP analysis. Based on these findings it is clear that the population of UPRR's wooden rail tie wastes is non-hazardous with respect to pesticides and PCBs. 11183843Pol lack-1.dou 4