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Noise "1'he Vineyard Avenue Corridor Specific Plan identities two potential noise sources, Vineyard Avenue and RMC Lonestar quarrying operations, that may produce noise exceeding the General Plan acceptable levels on several of the properties within the specific plan area. The proposed project is not in one of those locations. Staff has added the standard conditions of approval related to noise in the Vineyard Avenue Corridor Specitlc Plan area, i.e., deed disclosures about noise, dust, and vibration from the quarries, and a disclosure about potential airplane noise due to the proximity of the Livermore Municipal Airport. Grading, Drainage, and Utilities The topography of the property is moderately to steeply sloped. The Vineyard Avenue Corridor Specific Plan states that all proposed graded slopes should have a maximum 3:1 grade, states that "rounded form grading" should be utilized, and grading should be compatible with existing topographic contours. Also, residences located on slopes greater than 15 percent are required to he accessible from minimum 16 foot wide driveways (20 feet clear) designed to accommodate fire-tighting equipment. Also any private driveways exceeding 150 feet in length are required to be designed to allow fire truck turn around. The driveway leading to Lot 1 and turnaround area on Lot 1 are required for emergency access reasons. A maintenance association (or maintenance agreement) will be required to ensure the long-term maintenance of these areas. The overall grading concept for this project will be a more traditional flat pad grading under the home with sloping contours around the homes. The proposed grading consists of cuts up to about 6 feet deep and fills up to about 13 feet thick. The peer reviewer has indicated that the cuts may actually be up to 12 feet deep, in order to remove existing fill on site. Various slopes adjacent to the homes will be created by the grading; these slopes will be up to 25 feet high and have inclinations of about 2:1 (horizontal to vertical). On Lot 1 the house is proposed in the existing generally flat area, thus minimizing the grading of this lot. On Lot 2, the applicants are proposing a two foot step between the garage and the house so that the house will blend in slightly better with the hillside. Staff has added a recommended condition of approval that the area west of the house on Lot 2 be graded to a 3:1 slope to be more consistent with the Vineyard Avenue Corridor Specific plan. This would likely require that the applicants install two additional retaining walls less than four feet in height by the western slope. 1'he proposed grades are rounded, as required per the Specific Plan. The fire truck access has been provided, as required. Per the geotechnical report, the site has a low potential for landslides. Due to the natural topography of the site, the applicants are proposing a bioswale by the western side of the lot and a cross drainage easement between the lots is required. As conditioned, the applicants will work with staff on an appropriate bioswale size, and plant species, prior to minor subdivision approval. A maintenance association (or maintenance agreement) will be required to ensure the long-term maintenance of the bioswale. Case No. PUD-56 Planning Commission Page - 11 -