4930 NARBECK AVE 2016-01-01 MF Import

u � � OAYID L. NELSON AND ASSOCIATcS, INC. Consultin� E�ineain` Geo�ugy August 29. 1983 Project No, 4183 Page four Recommendations The natural soils encountered ti.roughoi�t the eite area appear quite suitable for support oP proposed structurea. Since� however� some etructures may be located near the ateep elope are we believe a building set-back lia�it should be es�ablished. Based upon our observations and past expe:cisn.^.e. we believe a building set-back of 2$ feet should be adequate to maintain a atable building aite area within the oteep elope areas. This generally ahould be utilizad along the toLal eaeterly ateep aloF area and approximately one-half of the weaterly ateep elope aree The northern portion of the weeterly elope is much leee steep ar. a eignificant top-of-slope ia leae obvioue. We euggeat Mithin this area that a building eet-back oP 10 feet ehould be adequate Residence foundatione ahould be placed into the dease natural soils� found generally 2' to 3' below grade� belorr +he organic topsoil and root ladden atrata. Maximum allowabla eoil preasure of 2500 pounde per aquere t'oot (pat') ehould be anticipated� ueir. continuoue type footinga� placed a minimum of 18" below finiah grade as to be below froat line. In some of the moderate alope areas, this may require atepped foundatione to adequately pene- trate the natural denae soile. Should basementa be desired, the upelope walls ehould be deaigned ae rataining walle, ueing adequaLe drainage and equivalent f'luid preseuree of 40 pounde per eubic foot (pef). Adequate drainage ehould be provided around the structurea ` conefating of foundation and roof drain eyatema independantly directed into the main stor�.drainage syetem or approved outfall area. Retaining walle ahould utilize a perYorated pipe basal dz connected to an 18" tbick washed aggregate blanket behind th� wall which extenda to within lf" of the aurface, which is direct into the main drainage system. L.�.,.n-ti-_ •��-,�,-��-�...,.,�-_._.._..._-