5107 SOUND AVE 2017-01-14 - Laserfiche WebLink

Ju]y 21, 201� Two Single-Family residences L&A Job I'�To. 14-065 Page 20 B�ailding Footing Drains A subdrain shauld be installed, around the perimeter footings of each proposed building. The subdrauis should consist of a 4-inch-minimum-diameter, perforated, rigid, drain pipe, laid a few inches below bottom of the perimeter footings of the buildin.gs. The trenches and the dra'vl lines should have a sufficient gradient (0.5% muumum) to generate fiow by gravity. The drain lines should be wrapped in a nan-woven filter fabric sock and completely enclosed in clean washed gravel. The re�naining trenches may be backfilled with clean onsite soils. Water collected by the perimeter footing subdrain systems should be tightlined, separatel}� from the roof and sur�ace stormwater drain lines, to discharge it;`� ��,'r,-,.'� �Pi�'�?' �r �,,;t;��,1P sto�nwat�� ci�snosat fa�ilitieS. Surface Drainage Water should not be allowed to stand in any areas where footings, on-grade slabs, or pavement is to be constructed. Finish ground surface should be graded to direct surface runoff away irom proposed buildings. We recommend the finish ground be sloped at a gradient of 3 percent minimum for a distance of at least 10 feet away from the buildings, except in the areas to be paved. Cleanouts Sufficient number of cleanouts at strategic location� should be provided for underground drain lines. The underground drain ]ines should be cleaned and maintained periodically to prevent clogging. LIU & ASSOCIATES, INC.