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Timing: Prior to approval of Final Map(s). NOISE 22. Soundwalls: Construct noise walls pursuant to the"Community Sound Wall and Community Edge Plan"for the Machado Property Tract 3481 Tentative Map, dated March 15, 2006, and/or as required by Mitigation Measure 4.13-4 and as indicated in Table 4.13-11 in the Final EIR. Timing: Design submitted with Improvement Plans and constructed as part of Final Map 23. Locations and Heights of Soundwalls and Berms: The applicant shall construct soundwalls with or without berms at the locations shown in Figural 1-1 of the Mountain House Specific Plan ///and as required by Table 4.13-11 of the College Park Final EIR. The soundwall along De Anza Boulevard shall be 7 feet in height; and the soundwall along Grant Line Road shall be 8 to 9 feet in height. Where soundwalls would exceed these height standards, berms shall be used to reduce the overall soundwall height to said limits. Where any openings in soundwalls are proposed for pedestrian access, "return"walls shall be provided at the openings. These return walls shall continue along the depths of the adjoining residential yards and shall extend no less than to the rear yard setback. (This return wall requirement does not apply to"side on" lot conditions.) With respect to these return walls, CDD may allow the soundwall to be increased a maximum of one additional foot on the street side of the local road or collector street to compensate for varying pad height and berming on the adjacent arterial roadways. Entry walls into the neighborhood may be increased more than the additional one foot, subject to CDD approval. The proposed soundwall (or portion thereof) along theses roads may be constructed to a height that is less than the height standard specified, subject to confirmation of a noise study prepared by a noise consultant approved by CDD and MHCHD. [Implementation Measure 4.2.8.3.d] Timing: Design submitted with Improvement Plans and constructed as part of Final Map 24. Increase Traffic Noise: Before occupancy of the first residence at College Park, a noise barrier shall be constructed by the College Park developers between the five existing residences located on the north side of Grant Line Road between Central Parkway and the Alameda County line (Receptor 14 in Figure 4.13-2 of the College Park Final EIR)and the northern travel lane of Grant Line Road. The noise barriers may consist of a wall, berm, or combination thereof. The exact location, height, and character of the noise barrier shall be determined by a noise consultant approved by the County. The sound barrier shall reduce outdoor noise levels at the center of the front yards of the five existing residences to below 65 dBA LddCNEL. If Grant Line Road is widened at this location subsequent to construction of the sound barrier but before removal of the five residences under Specific Plan II, the sound barrier shall be relocated, as required. If the five existing residences are removed under Specific Plan II before occupancy of the first residence under the College Park project, this mitigation measure shall not require implementation. This mitigation shall be funded through fair-share payments by the College Park developers. [MM 4.13-3] Timing: Design submitted with Improvement Plans for first Final Map and compliance verified prior to the issuance of building permits. 25. Traffic Noise—Arterials: Before occupancy of the first residence proposed under the College Park project along each of the seven arterial segments identified in Table 4.13-11 of the College Park Final EIR, a sound barrier shall be constructed by the College Park developers along that arterial segment. The noise barrier may consist of a wall, berm, or combination thereof. The exact location, height and character of the sound barrier shall be determined by a noise consultant approved by the County. The sound barrier shall reduce outdoor noise levels at the center of backyards of proposed adjacent single-family residences 6