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3.0 Environmental impact Checklist <br /> recommendations of the Geotechnical Investigation and Pavement Design Report <br /> (September 2012)prepared for the project. At a minimum,the plans shall specifically <br /> include the following measures to address the impacts from native surface soils with <br /> high expansion potential: <br /> . Mat foundations shall have a minimum thickness of 12 inches and be properly steel <br /> reinforced. <br /> 2. Building pads shall be underlain with a minimum of 12 inches non-expansive fill <br /> layer or 12 inches of lime-treated native soil material. This layer shall be compacted to <br /> at least 90 percent relative maximum density. <br /> 3. When continuous perimeter and isolated interior spread footings are used, they must <br /> be founded at a minimum depth of 24 inches below rough soil pad.Both interior and <br /> perimeter foundations should be founded at the same elevation below pad grade <br /> with the exception of any soil retaining structure foundations. <br /> 4. Footing excavation shall be saturated with water(but not overly saturated) and <br /> continue to be periodically saturated after footing excavation and prior to concrete <br /> placement. <br /> 5. Prior to the issuance of a project Grading and Encroachment Permits, the applicant <br /> shall submit a supplementary letter from the Geotechnical Engineer regarding the <br /> recommended pavement section(s) for permeable pavement. <br /> e)Have soils incapable of adequately supporting the use of septic tanks or alternative <br /> wastewater disposal systems where sewers are not available for the disposal of wastewater? <br /> No Impact.The existing residential uses on the project site are connected to the existing <br /> wastewater mains operated and maintained by the City.Likewise,the project would be <br /> connected to the existing wastewater mains. The project would not install or use septic tanks or <br /> alternative wastewater disposal systems and thus no impact would occur. <br /> 3.7 GREENHOUSE GAS EMISSIONS <br /> Significant ig aif€conl Lens-lhon- <br /> Would the project; Impact Impact with SignlIIcnrnl Flo Impact <br /> ►iligation imaact <br /> In co *ra d <br /> a) Generate greenhouse gas emissions,either <br /> directly or indirectly, that may have a significant ❑ ® ❑ <br /> impact on the environment? <br /> b) Conflict with an applicable plan, policy,or <br /> regulation adopted for the purpose of reducing <br /> 0 <br /> the emission of greenhouse gases? ) <br /> La Palma Subdivision Project <br /> Final Initial Study/Mitigated Negative Declaration <br /> 35 <br />