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RESULTS <br />The soil descriptions and photographs for each soil pit aze contained Appendix 1. The <br />primary soil parameters including bottom depth of rooting, depth to the top of mottling <br />and depth to surface of the groundwater table are summarized in Table 1. <br />Table 1. Selected Soil Pit Parameters <br />Soil Pit # Depth of Rooting <br />(inches Depth to Mottles <br />inches Depth to Water <br />(inches <br />1 96 19 96 <br />2 67 34 67 <br />3 60 na na <br />Maximum rooting depth at soil pits #1 and #2 was observed into the seasonal high water <br />table. Mottling in the soil profile is a good indication of the depth of the seasonal high <br />water table. This high water table fluctuates with the season and by year. <br />• Unconsolidated stream-laid sediments were observed at 96 inches in soil pit #1 and at 67 <br />inches in soil pit #2. Both of these soil pits exhibited water flow from these <br />unconsolidated gravels and coarse sands. Soil profiles from soil pits #1 and #2 also have <br />an overthickened (cumulic) mollic epipedon as a result of slow accumulation of material <br />deposited from occasional flooding. These soils have formed in positions where they <br />receive fresh sediments at a rate slow enough for the material to become incorporated in <br />the mollic epipedon. Enhanced vegetation growth and plant species adapted to mesic <br />sites was also evident adjacent to soil pits #1 and #2. <br />The maximum rooting depth at soil pit #3 was observed to a maximum depth of 60 inches <br />with a significant decline in roots noted at shallower depths due to calcareous root <br />restricting horizons. No indicators of AVF soil characteristics were evident in this soil <br />pit. Reduced vegetation growth and production were evident from the plant species that <br />are more adapted to semi-arid, non-subirrigated sites. The field survey indicated a <br />distinct soil, vegetation, and topographic boundary between the AVF and the upland <br />portion of the study area to the proposed ventilation shaft facility. <br />Soil pit #3 is located on the Binco soil series that has formed on a mountain foot slope. <br />The Binco soil is formed in alluvium, colluvium, and residuum, that is derived from <br />sedimentary rocks. While this colluvial material may overlay water-bearing <br />unconsolidated alluvial strata, these colluvial materials aze at a sufficient depth and <br />contain shallow, calcareous root restricting horizons that prevent any subirrigation <br />• potential. <br />