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Section 5 <br />Phase I Day Time Construction Activities <br />The Phase 1 day time construction activities includes a worst case scenario that <br />considers the day time construction of the water supply pipeline and back flush <br />within Centennial Park along with all other Phase I construction activities. As <br />shown in Table 36 the Phase 1 construction activities would exceed day time <br />noise standard at Receivers 10, 16, 17, and 18, <br />The noise level at receptor 10 would increase by less than 1 dB and would not be <br />discernible. The construction activity having greatest influence on Receiver 10 <br />would be the construction of water supplyYback flush pipeline along Centennial <br />Loop Road, which would occur at night, which would reduce noise impacts near <br />Receiver 10 during the day. <br />The proposed site improvements (irrigation line reconstruction and grading for <br />the interpretive kiosks) at the Heritage Museum would exceed the day time noise <br />standard at Receiver 16, 17 and 18. All of the construction activity would occur <br />within the allowable hours when the construction noise would be exempt under <br />the City's Noise Ordinance. To minimize noise impacts near Godinez High <br />School and near the Mitchell School, the project has incorporated a design <br />feature that requires the Heritage Museum site improvements to occur when <br />school would not be in session. Potential construction noise impacts would be <br />less than significant. <br />Table 36: Phase 1 Construction Day Time Noise Levels <br />Rkpariver <br />Description <br />Existing <br />Fxjstkng <br />Increase <br />(1) Noise <br />I <br />Construction <br />'Standard, <br />Throh6ld <br />I <br />Multi Family west <br />41.8 <br />46.8 <br />5.0 <br />55r6 <br />Santa Ana River <br />-6-4 <br />2 <br />Multi Family west <br />61.9 <br />64 0 <br />2 A <br />9 <br />Santa Ana River <br />3 <br />Single Family north <br />65,6 <br />67.5 <br />1.9 <br />68.6 <br />Edinger Ave. <br />4 <br />Single Family north <br />64A <br />66.7 <br />2.3 <br />684 <br />Edinger Ave. <br />5 <br />Single Family north <br />647 <br />67.3 <br />2.6 <br />67.7 <br />Edinger Ave, <br />6 <br />Single family north <br />71.7 <br />71,8 <br />0.1 <br />74.7 <br />Edinger Ave. <br />7 <br />Single family north <br />67.6 <br />677 <br />01 <br />70.6 <br />Edinger Ave. <br />8 <br />Multi Family north <br />66.2 <br />66.4 <br />0,2 <br />692 <br />Edinger Ave. <br />9 <br />Centennial <br />59,5 <br />602 <br />01 <br />62. <br />n <br />Mid Basin Centennial Park l28t-IA9 Project Final EIR 5-154 <br />