RES 99074 - Laserfiche WebLink

Changes or alterations have been required in, or incorporated into, the project which mitigate or avoid the significant effects on the environment. Facts in Support of Finding The City of Pleasanton has adopted the following measures which will reduce potential earth resource impacts to a less-than-significant level: Mitigation Measure 4.2-4: F_.lplnraiYl.~L On expansive soils with moderately high shrink-swell potential (Perkins loam and Pleasanton and Positas gravelly loam), building foundations and improvements shall consist of drilled pier and grade beams, deepened footings (extending below expansive soil), or post-tensioned slabs. Altematively, expansive soil shall be removed and replaced with compacted non-expansive soil prior to foundation construction. The geotechnical report for each phase of the project shall require that subgrade soils for pavements consist of moisture-conditioned, lime-treated, or non-expansive soil, and that surface (including roof drainage) and subsurface water be directed away from foundation elements to minimize variations in soil moisture. Improvements proposed to be placed on slopes greater than 10%, or within 10 feet of the tops of such slopes, shall be approved for construction by a California licensed geotechnical engineer or California certified engineering geologist. The City shall approve grading plans and slope designs prior to implementation. HYDROLOGY AND WATER QUALITY (Section 4.37 SIGNIFICANT EFFECT Impact 4.3-1: Increased Runoff. Development of the Specific Plan Area would result in the construction of additional impervious surfaces within the project site and may increase runoff. This would be considered a potentially significant impact. Changes or alterations have been required in, or incorporated into, the project which mitigate or avoid the significant effects on the environment. Facts in Support of Finding The City of Pleasanton has adopted the following measures which will reduce potential hydrology and water quality impacts to a less-than-significant level: Mitigation Measure 4.3-1: Increased Runoff. Grading and drainage design plans shall be submitted to the City Engineer for each phase of development within the Plan Area and reviewed for compliance with all applicable City requirements. The drainage plans shall demonstrate that the proposed developments would minimize or eliminate increases in the volume or rate of runoff associated with both small and large storm events (including 2-year to 100-year storm events) from the development sites. Vineyard Avenue Corridor Specific Plan Draft EIR -11- Findings