2501 W CASINO RD 2018-01-02 MF Import

� � GEOTECHNICAL ENGINEERING STUDY Told Development � May 8, ]990 E-4888 Page 7 � greatest benefit to the site. We reca�mend that the ditches be put in as soon as �ossible before site work is staried. � To further aiJ in thc control of the perched wa-ei, we remmmend that a french-drain be placed along the west side of the parking area to 3ntercept seepage coming f;om the property � to the wcst. If the perched water on the site is handled properly and early enough, it should not present ; constniction problems, However, the Site should be graded such that surface water collected � �uring construction is directed off the site. Water shot�ld not be allowed to stand in any � area wtiere buildings, slabs or pavements are to be cons�ructed. During construction, loose sudaces ahould be sealed at night by compacting the surface to reduce the potential for � moisture infiltration into the soils. Final site grades should allow for drainage away from the building foundations. We suggest that the ground be sloped at a gradient of three percent for n distance of at least ten feet away from the buildings except in areas that are to be � paved. If seepage is encountered in fouridation or grade beam excavations during construction, we � recommend that your contractor slope the bottom of the excavation to one or more shallow s�mp pits, The collected water can then be pumped from these piu to a positive and permanent discharge, such as a nearby storm drain. Depending on the magnitude of such � seepage, it may also be necessary to interwnnect the shallow sump pits by a system of shallow connector trenches. � If conventional spread footings are used, we recommend the installation ot footing drains around the building perimeter. These drains should consist of a four•inch minimum diameter, perforated or slotted, rigid drain pipe laid at, or just below, the invert of the � footing with a gradient suf5cient to initiate flow. The drain line ahould be bedded on, suttounded by, and covered with a free-draining washed rock, pea gravel, or other free- draining granular material, as shown on Plate 3. � Once the drains are installed, with the exception of the upper twelve (12) inches, the of filleshould consistof�compacted andrrel tively�limpermeable soil.urIt ean beesepera�ed from � c the underlying more granular drainage material by a layer of building paper or visqueen. 'I'he surface should be sloped to drain away from the building wall. Alternatively, the surface � can be sealed a�th asphalt or concrete paving. A typical detail is provided on Plate 3 Under no circumstances should roof downspout drain lines be connected to the footing drain � system. All roof downspouts must be separately tightlined to discharge. We recommend yuu install sufflicient cleanouts at strategic locations to allow for periodic maintenance of the footing drain and downspout tightline systems. ' ' Earth Consultants, Inc. ' tl