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10. Expansive Soils <br /> <br /> The applicant shall mitigate the problems of expansive soils <br /> and corrosivity as stated in the Final EIR. Such mitigations <br /> shall include the following: <br /> <br /> a. A geotechnical evaluation shall be performed on each lot <br /> or group of lots with similar subsurface conditions after <br /> subdivision grading is completed and prior to issuance of <br /> building permits. Corrosivity and expansion potential of <br /> the native material and fill shall be evaluated by the <br /> geotechnical engineer along with the subsurface <br /> conditions observed during grading. The geotechnical <br /> engineer shall provide building foundation design, soil <br /> preparation, and fine grading recommendations which are <br /> appropriate for the on-site soil and geologic conditions <br /> observed after subdivision grading is completed. <br /> <br /> b. The surface drainage system on each lot shall be designed <br /> by a qualified civil engineer and shall be compatible <br /> with the subdivision's drainage system. The following <br /> items shall be incorporated into each lot's surface <br /> drainage system, unless otherwise allowed for custom <br /> lots: <br /> <br /> 1) All building pads shall be rough graded with a 2% <br /> slope. <br /> <br /> 2) All roof downspouts shall be connected to a solid <br /> pipe collector system which discharges directly to <br /> a City storm main or street gutter. <br /> <br /> 3) The crawl space of each house shall be provided <br /> with a drainage system which will discharge all <br /> water which might enter the crawl space directly to <br /> a City storm main or street. <br /> <br /> 4) Landscaping and walks shall be installed so that <br /> the surface drainage system is not disrupted. <br /> <br /> 5) Building pads shall be finished graded with a 2% <br /> slope for a minimum of 4' away from the building <br /> foundations. Site drainage shall be directed <br /> toward the street or storm drain system in <br /> accordance with section 2907(d) 5 of the Uniform <br /> Building Code. <br /> <br /> 6) The applicant shall prepare detailed lot drainage <br /> requirements and shall include them in the CC&R's <br /> for each lot. Specific reference to these <br /> requirements shall be made in the deed for each <br /> lot. <br /> <br /> - 14 - <br /> <br /> <br />