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Section 5 <br />With the construction of the sound walls, the well construction activities would <br />result in noise levels that would range from a O 1 dB increase to a 0 �8 dB <br />increase. As shown in Table 43, the construction activity would not exceed the <br />night time noise standard. Potential noise impacts would be less than significant. <br />Phase 3 Construction Activities <br />The Phase 3 construction activities would include: Sound Wall Construction and <br />Removal at MBI-3; Conductor Casing Installation at MBI-3; Borehole Drilling and <br />Reaming at MBI-3; Well Construction at MBI-3; and Well Development at MBI-5. <br />The sound wall construction and conductor casing installation would occur during <br />the day. The borehole drilling and reaming, well construction and well <br />development activities would occur 24 hours per day. Since well development at <br />MBI-5 has the potential to occur simultaneously with the borehole drilling and <br />reaming at MBII-3, it has been analyzed in combination with the borehole drilling <br />and reaming at MBI-3. <br />114611-3 Sound Wall Construction <br />The noise levels generated from the construction of the sound wall at MBI-3 <br />would range from 0.1 dB increase to a 1.2 dB increase. As shown in Table 44, <br />the construction activity would not exceed the day time noise standard. <br />Additionally, the construction and removal of the sound walls would occur during <br />the day when the construction activity Would be exeirript under the City's <br />Ordinance, Potential noise impacts would be less than significant. <br />Table 44: M1131-3 Sound Wall Construction Noise levels <br />Rocolivor <br />poscription <br />Rxistirig Exisitirro + <br />Increase <br />(1► Nalse <br />Threshold <br />1 <br />Multi Family west Santa <br />41.8 410, <br />1.2 <br />55,0 <br />Ana River <br />2 <br />Multi Family west Santa <br />61,9 620 <br />0.1 <br />649 <br />Ana River <br />3 <br />Single Family north <br />65.6 65.8 <br />02 <br />68.6 <br />Edinger Ave, <br />4 <br />Single Fancily north <br />64.4 65.2 <br />0.8 <br />68.4 <br />68.4 <br />Edinger Ave. <br />5 <br />Single Family north <br />641 65,0 <br />0.0 <br />677 <br />Edinger Ave. <br />6 <br />Single family north <br />713 71.7 <br />0.0 <br />743 <br />Edinger Ave, <br />Single family north <br />67.6 67.6 <br />0.0 <br />70.6 <br />Edinger Ave, <br />8 <br />Multi Family north Edinger <br />66,2 66,2 <br />1 0.0 <br />1 69.2 <br />Mid Basin Centennial Park 21-jeLQnjg1,1Project Final EIR 5-164 <br />