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Allowing steeper slopes and the use of an alternate liner design have several potential positive <br />environmental impacts. Most of the clay required to construct the slopes as currently approved would have <br />to be trucked to the site and would require approximately 8,000 truck trips. Additionally, most of the <br />structural fill for the slopes will come from outside of the alluvial deposit. Increasing the slope angle from <br />3:1 (horizontal to vertical) to 2:1 (horizontal to vertical) would decrease truck trips needed to haul the fill <br />by approximately a third. A steepening of the slope angle and the use of an alternate liner system would <br />result in a decrease in traffic impacts and air pollution because of the reduction in truck trips. Allowing <br />steeper slopes and the use of an alternate liner system would also increase the potential storage volume of <br />the resulting reservoir to approximately 4,000 acre-feet or more. <br />2 <br />