EXH0693026116

Re: Modeled Area and Hydrus Model Results Draft Interim Deliverables Date: June 25, 2001 This memo presents the following interim draft deliverables related to Hydrus/Slice modeling of third runway fill: • Definition of the area to be modeled by Hydrus/Slice instead of HSPF • Effective Recharge • Selection of Cross Sections (locations for Slice models) • Fill thickness • Definition of soil as modeled in Hydrus • Draft Interim Hydrus Modeling Results Definition of the Area to be Modeled by Hydrus/Slice Instead of HSPF PGG used existing GIS coverages of existing topography, "built" topography, and third runway pavement distribution to calculate areas for Hydrus/Slice modeling. The areas to be modeled by Hydrus and Slice (and therefore removed from HSPF) are shown on Figure 1 and Table 1. The areas include proposed additional runway fill in the Miller and Walker Creek basins minus the steep slopes along the western edge of the constructed fill. The north-south extent of the fill within the Miller Creek and Walker Creek basins will be used along with other data to integrate Slice model results along the respective basin lengths. A dashed line is drawn on Figure 1 between the Miller and Walker Creek Basins. The location of the line is approximately the same as the co-incident surface water and groundwater basin boundaries used within the HSPF models (Parametrix SMP Figure B2-2). The areas indicated in Table 1 below are consistent with the line drawn on Figure 1. The basin areas to be modeled by Hydrus/Slice…

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Call to order – Roll Call – Quorum Established – Land Acknowledgement We would like to acknowledge that our Agency operates in four present-day counties, which are the traditional lands of the Coast Salish people, past and present. This acknowledgement does not take the place of authentic relationships with indigenous communities in our jurisdiction and [...]