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Noise Development Title Section 9-1025.9 lists the residential use type as a noise sensitive land use. Development Title Section 9-1025.9(d) states that the Review Authority shall require the preparation of an acoustical study-in instances where it has determined that a project may expose existing or proposed noise sensitive land uses to noise levels exceeding.the noise standards specified in Table 9-1025.9. Volume III of the General Plan states that the 65 dB noise contour level along State Route 88 (between Eight Mile Road and the Amador County line) is 133 feet from the edge of the roadway (Table III.D- 4A, pg. IIID-21). As a result, an acoustical study has been required. The applicant submitted a Noise Impact Study prepared by The Acoustics & Vibration Group (January 2004) to identify potentially significant noise impacts from State Route . 88 and has provided mitigation measures to reduce these impacts to a less than . significant level. The mitigation measures include the following, recommended conditions of approval, which are developed based on the following findings contained in the noise study: (• A sound wall must be built along the south property line of the lot immediately adjacent to State'Route 88 (Lot 1) to meet the backyard sound limits. The wall shall extend 200 feet from the intersection of Athearn Street along State Route 88 and extend a minimum of 30 feet perpendicular to State Route 88 along the boundary between the lot and parcel number 019-210-20. The sound wall must have a minimum surface weight of 3.5 to 4.0 lbs./sq. ft. The structure must be continuous along its width and height with no gaps including where the wall meets the ground. The wall shall be a minimum of six feet in height. • Table 9-1025.9 of the Development Title states that the maximum allowable M noise exposure level for interior spaces in a residential use is 45 dB. It is 1 strongly recommended that only a one-story home be built on Lot 1. Any:living space above one story will be exposed to the highest sound levels. However, if a two-story residence is proposed for this parcel, an interior sound study shall be performed for the proposed residence on Lot 1 when the building elevations, floor plans, and construction details are available. The purpose for the study is to M determine mitigation measures needed to meet minimum interior space noise standards: Before any building permit application is submitted for Lot 1, the interior noise study will be reviewed by the Community Development Department and must show that the interior noise level will be no greater than 45 dB. .The mitigation monitoring program would be implemented as follows: ♦ impact: To meet interior noise level standards for a two-story residence I on Lot 1 set forth in the Development Title. ♦ Mitigation: Conduct an interior sound study to ensure that the interior noise levels for a two-story residence is below the maximum level of 45 dB. A notice will be electronically placed upon the parcel in the computer system at the Community Development Department. This notice will state that an interior noise study must be done in the event that a two- story residence is proposed for Lot 1. . ♦ Time of Mffggfion: Before the submittal of any building permit application for Lot 1. ♦ Responsible A ecr ncy: Community Development Department. 2