1901 MERRILL CREEK PKY 2018-01-01 MF Import

' � ' _ . ', 1 drains, conventional wall drains consisting of perforated pipe placed at the inside, bottom of the wall, and pe�manent intercepror ditches/trenches. Detailed grading ard drainage ` recommendations are provided in subsa�urnt sections of this repo�t. We have also included I , tecommendations to prevent significant erosion. �� 2. The proposal addrases the existing geologial constraints of the site, including an assasrt►ent of soils and hydrology. i- ! Refer to the "Site Conditions"section of this report for a complete discussion of soils �— and hydrology at the site. We rccommend the following site preparation, earthwork, and i, drainage procedures be impiementcd to address the geological constraints of the site: ; Areas to receive structural fill should be stripped of vegetation and � strucmral C�II should be placcd on ezisting slopes by terracing into competent nacive soils. This should be accomplished by constructing a series of horizontal benches cut into the slope gredient and placing � st�uctural fill in horizontal lifts. The ezposed stratigraphy of the subsurface soils should be observed and evaluated by a geotechnical ' enbineer to identify areas where subsudace dninage measures are appropriate (e.g., installation of interceptor ditches). Drainage facilities for control of boch surface and subsurface water should be installal. I These include footing and wall drains, and a properly designed detention i system. i � 3. The proposed method of construction wilt reduce erosion potential, lardslide and seismic i ' ha�ard potential, and wili improve or not adversely aPFxt the stebility of slopes. I �- As mentioned in the text of this report, the final grading plan will result in . development that is mon stabte (statically and seismically) than the existing conditions. , Specific erosion control masura are also diuussed in the text of the reEwrt. r We recommend that all surface water nmoff be intercepted by adequately designed � swales, interceptor ditches, or footing dnins that tightline to a suitable discharge or detention system. Collxted sudace or subsudace water sho:ld not be dischuged on the � slope face. The stability of slopes will be improved by proper 1►andling of all surface and subsurface water. Also,the stability of slopes will be improved by grading them ilatter and � by utilizing properiy daigned retaining wells, thereby reducing slope gradients at the site. i `� 4. The proposai ases constructiontechniqua which minimiu disn�ptionof existing topography � and natural vegetation. � r 6 e o E n � i n e e r s $ FiNNo.1/60-006�77-0130lIU29T t l