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an Ldn of 45 dB. [SPIT Implementation Measure 11.2.1 (4)] Timing: Compliance verified prior to the issuance of building permits. 26. Locations and Heights of Soundwalls and Berms: The applicant shall construct soundwalls and berms at the locations shown in Figure 5.11-2 of the Mountain House Specific Plan 11 Initial Study. 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.) The soundwall along Great Valley Parkway shall be 7 feet in height; and the soundwall along Grant Line Road shall be 8 feet in height. Where soundwalls would exceed these height limits, berms shall be used to reduce the overall soundwall height to said limits as measured from the arterial street grade to the top of the wall. Timing: Improvement plans approved by CDD and MHCSD prior to first Final map approval. 27. 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 AND SOILS 28. Seismic Safety: The applicant shall comply with the applicable provisions of the MHCSD Emergency Preparedness Plan. Timing: Inclusion of a note on Improvement Plans approved by CDD and MHCSD prior to approval of Final Maps. [SPII Implementation Measure 6.8.3 (1)] 29. Geotechnical Investigation Recommendations: The applicant shall follow the recommendations of the Geotechnical Engineering Study, Neighborhood C, Mountain House, California, prepared in April of 2004 by Condor Earth Technologies. Timing: Inclusion of a note on Improvement Plans approved by CDD and MHCSD prior to approval of Final Maps, and the incorporation of all recommendations of the geotechnical engineering study into site preparation and construction of each dwelling prior to approval of building permits. [SP II Implementation Measure 6.8.3 (2); San Joaquin County Development Title, Chapter 9-905] 25