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i MOUNTAIN HOUSE NEIGHBORHOODS K AND L INITIAL STUDY 5.ENVIRONMENTAL CHECKLIST 8.HYDROLOGY AND WATER QUALITY I � Significant Impacts Identified in 1994 MEIR The 1994 MEIR identified significant and potentially significant hydrological/water f� quality impacts of the Master Plan related to the following: 1) Increased sedimentation within Old River caused by runoff from Mountain House Creek and operation of the proposed marina[no longer relevant].' 2) Water quality problems associated with inadequate water circulation in the proposed on-site marina[no longer relevant]. 3) Impacted water quality in Old River due to construction or proposed marina[no longer relevant]. 4) Shallow groundwater conditions presenting adverse conditions for E � construction of foundations and detention/retention basins. The project E could result in elevation of groundwater levels due to removal of subsurface drains. C- � 5) Erosion of levees by waves generated by boat wakes as a result of w increased boating within Old River and South Delta waterways and operation of the proposed marina [no longer relevant]. 1 6) Deposition of sediment transported by Mountain House Creek and deposited within the project site, potentially interfering with flood control and the enhanced habitat function of the Mountain House Creek corridor. If transported to Old River,sediment could have adverse impacts on �— downstream water quality. Findings Related to Significant Impacts Identified in -- 1994 MEIR Project impacts associated with the construction of a marina are no longer relevant since this element has been removed from the project. As part of Specific Plan II (SPIT),the formerly proposed marina land use has been converted to a regional and community park through the extension of the Old River Regional Park to the west by approximately one-half mile. This change in land use would reduce the potential negative impacts of project development on "waters of the state." A small public boat launch facility is proposed as part of the Old River Regional Park within Neighborhood K. However,this facility is significantly smaller than the facility originally proposed and would not have the water quality impacts related to the marina that were identified in the 1994 MEIR and described above. The following mitigation measures were adopted into the Master Plan to mitigate project impacts associated with erosion and sedimentation: 1)construction of sedimentation basins and other effective sediment control structures(i.e.,water quality ponds)to effectively remove sediment associated with runoff from the project site(Policy 7.2.8j), and 2)development of a basin maintenance program The marina is no longer proposed as part of the Mountain House community. I Isnn y 5-109