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25. Outdoor Noise Levels: Best available noise reduction measures shall be implemented by the applicant to reduce noise levels in primary outdoor use areas (backyards) of new residential development to an Ldn of 60 dB. The subdivider shall specify what additional, reasonable measures have been taken in this regard. Where it is not possible to reduce noise levels to this level using practical application of the best available noise reduction measures, an exterior noise level of up to 65 db may be allowed. [Master Plan Policy 11.3.1 (e)] In the case that noise levels cannot be reduced to the design noise level of 60 dB, the applicant must provide notice via a note on the deed of each lot stating that exterior noise levels may exceed 60 dB. Timing: Inclusion of note on the Final Map approved by CDD prior to Final Map approval,and inclusion of note on deed prior to issuance of building permits. 26. Soundwalls and berms: The applicant shall construct sound walls at the locations and heights shown in Figure 5.11-1 of the Initial Study for Neighborhoods K and L at Mountain House. Along Mountain House Parkway wall heights shall not exceed 7 feet tall as measured from the adjacent pad grade. [Master Plan Policy 4.2.7 (e)]. 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 sound wall 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 sound wall (or portion thereof) along these 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 MHCSD. All sound walls would be constructed in accordance with the MHCSD Design Manual and MHCSD Standards. Timing: Improvement plans approved by CDD and MHCSD prior to first Final Map approval. 27. Noise Monitoring:The applicant shall conduct noise monitoring at homes within Neighborhood L that are in proximity to the MHCSD wastewater treatment plant. If measured noise levels are higher than the adopted standards, the applicantshall work with the MHCSD to incorporate mitigation (sound walls or housings) that would result in noise levels within Master Plan requirements. 28. Interior Noise Levels: Interior noise levels for housing proposed to be located in areas exposed to an exterior noise level of an Ldn above 60 dB shall be maintained at or below an Ldn of 45 d6. [SPII Implementation Measure 11.2.1 (4)] Timing: Compliance verified prior to the issuance of building permits. 29. Construction Noise: The following measure shall be implemented during construction: Construction shall be restricted to the hours of 6:00 AM to 8:00 PM on weekdays. Extended hours which may include Saturdays and Sundays may be allowed through prior notice to adjacent residents and landowners, and prior approval of the MHCSD for infrastructure construction and CDD for building permits. All internal combustion engines shall be equipped with exhaust mufflers that are in good condition and appropriate for the equipment. Timing: Inclusion of the above measures as notes on Improvement Plans approved by CDD and MHCSD prior to Final Map approval. GEOLOGY ANP MLB 30. Seismic Safety:The applicant shall comply with the applicable provisions of the MHCSD Emergency Preparedness Plan. PA-1000266—Conditions of Approval 6