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Mountain House Specific Plan III ......................................................................................................................................................I.................... 4.5.2.2 Specific Plan III Description The majority of land within the Specific Plan III boundaries was previously used for agricultural,dairy or open space corridor uses.The land area is predominately flat at approximately 2%cross-grades and is _ generally suitable for development at its current grade. Grading and drainage patterns are generally from southwest to northeast and infrastructure systems have been designed accordingly to accommodate this pattern There are several significant land forms within the planning area that may require grading operations. The Delta College site is generally located in a slightly depressed condition due to excavation for the I-205 freeway development. An existing knoll directly north of the community college site may require significant grading to allow circulation access and pad development to occur. It is anticipated that knoll development will be at 20 to 30 feet higher in elevation than the adjacent college and residential parcels to the south and east. A conceptual grading plan has been developed to allow for this area development to occur with both potential infrastructure and circulation access. — Other less significant grading conditions include the filling of the existing irrigation network through the site,while still maintaining cff-site connections,and the removal of the bermed conditions along Grant Line road,at the Northeast corner of Neighborhood AB. It is the intent to provide a balanced cut and fill grading condition for all areas of Specific Plan III. 4.5.2.3 Implementation Measures a. Sites developed adjacent to undeveloped property shall establish perimeter grades no lower than the adjacent land, and no more than one foot higher,unless accommodated within a landscaped area or retained with a wall of no more than four feet. Slopes within these areas shall not exceed 3:1 horizontal to vertical or retained with a maximum four-foot height wall. b. Perimeter grades adjacent to developed properties shall match the adjacent grade,plus or minus one- half foot,unless occurring within a landscaped area, or retained with a maximum 4' height wall. c. Residential lots shall be graded such that the finished floor elevation is at least 12 inches above the _ street curb. d. In order to help minimize visual impacts of Arterial streets, curb grades should be established 6-12 inches below the finished grade at the right-of-way line. Roadway median strips should be graded with a crown height approximately 6-12 inches above the curb, for a typical 14-foot wide median. 4-52 Draft 03/14/05 ............................................................... ..........................................................................................................