3311 GRAND AVE 2016-01-01 MF Import

� � H 9Hp� H �� k � H �1 '� N'i1 fA H H 'y. O�d �/��g y� Y C% 9H� t�HH gy c� C y �� HON a iy August 15, 1991 Mr. Bob Norling eurfaca Drainaqa . -'y f.. G-0126 Page 13 ;t During construction, a silt fence erected along the base of the s]ope is advisable to filter out the sediments which may be carried �� downslope by surface erosion. A shallow, temporary ditch should be provided above the excavation to divert surface runoff on the hillside away from the construction area. I! Water should not be allowed to stand in any area where footir.gs, ,, slab, or pavement is to be constructed. The finish ground of the site should be graded such that surface water is directed off the garage addition. Final site grades should allow for drainage away �� from the building. A concrete-lined swale should be placed behind the garaqe walls to intercept and drain surface water into a permanent storm drain. „ oroundMater Drainaqe The qarage walls consisting of conventiona]. reinforced concrete �' wall poured against undisturbed cut banks or the soldier pile �� shoring wall with a permanent concrete facing should have a �; vertical drainage mat, such as Mirafi 6000 or equal, placed between , the cut banks and the concrete walls or concrete facing to drain groundwater seepage that may be trapped behind the walls. The !° vertical drain mat should be connected to a subdrain at the base of ''� the walls. !! i� ;i !A The subdrain system should be installed around the perimeter of the garage. The drain line should consist of a minimum four-inch, perforated or slotted, rigid, drain pipe laid at or just below the base slab (or footing) of the walls with a gradient sufficient to generate flow. A typical subdrain detail is shown on Plate 6. The drain line should be embedded on, surrounded by, and covered with Geo Consultanta Znc.