Customised Front Panel Wooden Horse Stable Wood Material Longlife Time

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Some soils that are high in clay content increase in volume when wet and contract when drying. This phenomenon is known as soil expansion and has potential for damaging structures and utilities, as well as affecting slope failure in some cases. Many of the soils in Marin County have moderate-to-high potential for expansion; typically the potential for soil expansion increases during the wet winter months and the soil contraction during the dryer seasons (Marin County 2005). Most soils in the proposed project area are classified by the NRCS as having high susceptibility for expansion; in particular, the Rodeo Clay Loam and the Cole and Cronkite soils are extremely prone to shrinking and swelling (NRCS 2007). However, engineering practices can reduce or eliminate potential damage by expansive soils to roads and structures, etc.

Erosion of hillside soils is problematic in the project area. Soil erosion can occur regardless of topography, including both relatively flat areas and slopes. Typically, steep slopes and large exposed areas are most at risk of severe erosion problems. Soils in the project area are susceptible to varying degrees of erosion based on several factors: soil type, depth, texture, slope, land use, vegetation cover and organic matter content, in addition to human modification of the landscape, can all affect the potential for soil erosion. The ability of the soil to store moisture and surficial drainage/runoff are extremely important factors that influence how much erosion will occur. Many of the issues of soil erosion are also tied closely to the discussion of mass wasting. As outlined above, the T-factor is an estimate of the maximum average annual rate of soil erosion by wind and/or water that can occur without adversely affecting conditions necessary for sustaining vegetation. These ratings are highly variable between soils at each of the sites; the Blucher, Cole, Cronkite, Humaquepts and Rodeo soils all exhibit a low probability of damage by erosional forces, while the Barnabe and Tamalpais soils have erosion rates that are extremely unsustainable. Many other factors, such as modifications by grading or construction, slope failure and other circumstances can alter the T-factor ratings. Table 3-2 below lists the Tfactor ratings for each of the soils types (including those as part of a complex).

All three action alternatives provide for the Muir Beach Volunteer Fire Department to continue to maintain facilities at Golden Gate Dairy under an appropriate business agreement and in a manner consistent with the protection of park resources at the site.

In all action alternatives, major new buildings such as residences are designed to reach three sustainability benchmarks: A minimum silver or higher Leadership in Environmentally Efficient Design (LEED) rating (achievable rating may vary by alternative). Section 9.1.1.6 of the NPS Management Policies (2006) states that ―All projects that include visitor centers or major visitor services facilities must incorporate LEED standards to achieve a silver rating".

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