6400 MERRILL CREEK PKY 2018-01-01 MF Import

r � 11ee shallow site soils have a high silt content and thus are moisture seasidve. Proper aite C pre�aration and earthwork procedures will be impoctant because the soils ue susceptible to diswrbance and are difficult, if�t impossible, to properly compact when wet. Paforming the earthwork during the rainy season will likely result in significandy higher grading costs than if � the wrork is perfi�rmed during the drier summer months. Our speci6c geotachnical recommendations snd sn:nmary of preliminary environmeatal + concerns for the site are presented in the following sections of thi� report. I_ SITE PREPARATION AND EARTHWORK [ We recommend that the proposed building and pavement azeas be stripped of vegetation aud significant organic material. We expect that the atripping depths will be somewhat variable, { although it appeazs that a 4inch minimum will be neccssary in most areas. Greater depths will 1 be necessary in areas supporting;thickly rooted growth. Root systems for lazge tree.c and sd►mps � should be gcubbed. The grubb.� and stripped material should be wasted off-site or used for landscaping purposes. As indicated, d:e site soils are moisture-sensitive and will be difficuit to operate equipmeat � on and to compact during wet weather. Thcse soils readily absorb moisture and ue difficult to dry out. Attempu W operate consuuction equipment on the native soils during wet oondidons will result im m�siderable dis!urbance to the exposed soils. Temporary access roads and layout � azeas consisting of a 12-to 18-inch-thick layer of quarry spal(s, crushed rock or pit�un sand sod gravel should be placed to supgo�t equipment during w�weather construction. 1he weathered � till soils also have a moderate erosion potential. Silt fences, hay bales and other measures s6ould be used to control erosion and sediment transport during consuuction. 1t�e forest duff ads as S a protective layer to the sur6cial soil and should be removad only whae and when nocessary. 'Ihose areas that are stripped or excavated to design subgrade elevations or ue to raceive � suuctural fill should be proo&olled with heavy rubber-tired conswction equipma�t during dry wealner, or probed during wet weather to identify areas of any soft or loose materials. Suc6 azeas should be recompacted, if practical, or removed and replaced with structural fill. In azeac � to receive structural fill, we recommend that any native soils that require recompaction be `- compactect to the same density criteria as recommended below for structural WI. If site work � needs to be done during wet weather, it may be necessary to ezcavate distufied or unsuitable material and to place a layer of sand and gravel with less than 5 percent fines (or quarry apalis) to provide a working surface. We recommend that proofroliing or probing of the subgrade be ( observed by a representative from our firm to assess the adequacy of thc subgrade condidons and �� to identify any areas requiring remedial work. r We expect that all of the soils encountered across the site can be re�noved with conventional � excavating equipment. It may ba nec�sary to rip very dense dil in localized ereaa to facilitate �. excavation, particulazly if any deeper trenches aze required. As mentioned previously, cobbles and boulders may be encountered randomly within the till. � 6 e o fi n g i n e e r ■ 7 Fik No.3266-002-R01/02N9!