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Model Input <br /> The model was run using soil concentration data collected from seven different drilling <br /> locations, to account for variable site conditions The drilling locations which were selected <br /> for use all had TPH as diesel concentrations measured in soil samples. The selected drilling <br /> locations were <br /> • MW-4 <br /> • B-1 <br /> • B-101 <br /> • B-102 <br /> • B-103 <br /> • B-104, and <br /> • SB-1. <br /> The locations of each of these borings and the former UST location are presented in Figure 2 <br /> The model input data were biased to predict a "worst-case" scenario for the site, since only <br /> the sample data from locations that closely surround the former UST location were used <br /> Model input parameters included chemical data collected from drilling at the site These data <br /> were supplemented by analytical results from soil samples collected within the excavation <br /> during the interim corrective action project implemented in May, 1995 (IT Corporation, <br /> 1995) In addition, widely accepted literature values and appropriate model default values <br /> were used, as they applied to the site Table 1 provides a summary of the model input <br /> parameters that were used to run VLEACHSM Appendix A provides copies of the input <br /> data that were used for each model run <br /> Two vadose zone thickness scenarios were modeled This was done because water levels <br /> observed at the site have varied by more than 20 feet in elevation The first scenano assumes <br /> a vadose zone thickness of 55 feet, and the second scenano assumes a vadose zone thickness <br /> of SO feet Each of the seven scenarios was modeled for a period of 100 years. <br /> Model Output <br /> Table 2 summarizes the concentration and year of the greatest maximum predicted mass <br /> loading at each location. The indicated years follow collection of the first data It was <br /> MZ/11-0 1-96/VDB F/96-0022 LF 3 <br />