11 ATTACHMENTS 1- 6 - Laserfiche WebLink

Finding 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 impacts related to fill settlement to a less-than-significant level: Mitigation Measure 4.4-6a: The differential fill thickness across a lot should be less than 15 feet. Lots requiring local subexcavation of soil and replacement with engineered fill to achieve this limit should be identified on the final corrective action grading plan. Mitigation Measure 4.4-6b: Following clearing and stripping, all areas to receive fill, slabs-on-grade, or pavement should be scarified to a depth of at least 12 inches, moisture conditioned, and compacted to the requirements for engineered fill. Mitigation Measure 4.4-6c: Site soils and bedrock used for engineered fill shall have organic content of less than 3 percent. Rocks greater than 6-inches in size shall not be placed at depths greater than 10 feet from finished grade. Rocks greater than 18 inches in size should be broken down such that their maximum dimension is less than 12 to 18-inches, or placed in non-structural fills below slopes or under one of the proposed detention basins. Alternatively, these rocks could be used in landscaping and/or creek restoration projects. Mitigation Measure 4.4-6d: Engineered fills shall be compacted to the specifications stated in the geotechnical framework. Over compaction of expansive materials(with a plasticity index of greater than 12)should be avoided within the upper five feet of building areas. All fills shall be placed in lifts not exceeding 12 inches, or the depth of penetration of the compaction equipment used, whichever is less. HYDROLOGY AND WATER QUALITY(SECTION 4.5) Significant Impact Impact 4.5-4: The proposed project would incrementally increase surface runoff from additional impervious surfaces and provide and additional source of polluted runoff, but would not exceed the capacity of the storm drain system. Finding 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 surface runoff impacts to a less-than-significant level: Mitigation Measure 4.5-4: The project sponsor, working with the Alameda Countywide Clean Water Program, shall implement a program to educate buyers about the potential water quality effects of stormwater pollution and effective measures to prevent the generation of stormwater pollutants from residential land uses. At a minimum, the program shall address stormwater pollutants such as hazardous materials commonly used in household applications; spilled oil, fuel, and other fluids such as antifreeze from vehicles; construction debris; landscape chemicals such as pesticides, herbicides, and copper-based algaecides; used packing materials; paint products; trash and litter; excess irrigation; and car washing. LUND RANCH 11(PUD-25)RESIDENTIAL PROJECT 13 FINDINGS