PC-92-16 - Laserfiche WebLink

should provide detailed recommendations and plans for acceptable cut and fill slope gradients, stripping, preparation of the subgrade to receive fill (including keying, benching and construction of subsurface drains under fill placed on slopes), acceptable fill mqterial, and fill placement requirements (including method of placement and degree of fill compaction). The geotechnical recommendations for each lot should be compatible with the overall geotechnical design for the entire subdivision. 70. (MM 9.D.4) The individual lot grading should be performed as recommended by the geotechnical and civil engineers. The lot owner's engineers should provide continuous inspection when lot grading is being performed to ensure the grading work is being performed properly. 71. (MM 9.E.1) A geotechnical investigation should be performed on each lot. The expansion potential of the native materials and fill on the lot should be evaluated by the geotechnical engineer. The geotechnical engineer should provide foundation design, soil preparation and grading recommendations which are appropriate for on-site soil and geologic conditions. The corrosivity of the native soils and fill should also be evaluated by the geotechnical engineer. All steel pipe should be coated or have cathodic protection. 72. (MM 9.E.2) The surface drainage system on each lot should be designed by a qualified civil engineer and should be compatible with the drainage system for the subdivision. The following items should be included in each lot's surface drainage system: a. Surface drainage should be carefully controlled at the base of all slopes adjacent to building pads. The civil engineer should submit proposed drainage techniques to the City for approval; taking aesthetics as well as engineering criteria into account. Drainage improvements should be appropriate for the slope on the lot; concrete-lined V- ditches should be used only where equivalent and less obtrusive techniques are not appropriate for use. b. All building pads should be rough graded with a 2 percent slope. c. All roof downspouts should be connected to a solid pipe collector system which discharges at a suitable outlet. d. The crawl space of each house should be provided with a drainage system which will discharge all water which might enter the crawl space. e. The surface next to the house should be graded with a slope of at least 2 percent away from the house for a minimum distance of 4 feet. The lot should be drained with swales which slope 2 percent and discharge at a suitable outlet.