4818 BELVEDERE AVE 2016-01-01 MF Import

Novembcr 9, 2006 Siagle-�amily Residence - Delvedere Lot 4 l,&A Job No. 6A 149 Page 13 be placed over firtn undisturbed subgrade soils under footings and on-grade slabs, es reyuired, to protect the soils fiom disturbance by construction trafiic. This crushed rock base should be built to a few inches above groundwater Ievel, but not less than 4 inches tSick. The crush mck base should be compucted in 12-inch lifls to u non-yielding state with a vibratory mechunir.al compactor. Runoff over Impervious Surfaces Stortn runofTover impervious surface, such as roofs nnd paved driveway, should be coilected by underground druin line systcros connccted to downspouts und by catch bsisins installed in the driveway. Stormwater thus collectcd should be tightlined to disr.hurge into a stortn sewer or a suitable stormwatcr disposal facility. 13uildinq Footing Drains A subclrain should be installed, as reyuired, around the perimeter footings of each of the proposed townhome buildings. 7'he subdmins should consist of a 4-inch-minimum-diameter, perforated, rigid, drnin pi�x, luid a few inches below bottom of the perimeter footings. The trenches and the drain lines should havc a sufficient gradicnt (0.5% minimum) to generate flow by gravity. The drain lines should be cmbeddcd in washed gruvel completcly �vrapped in non-woven filter fahr.c to within about 12 inches of tinish gradc. 'll�e remaining trenches may be backftlled with cican on-site soils. Water collected by the perimGcr footing subdrain systems should be tighdinrd. scparatcly from thc roof and surfacc stom��atrr dr;�in linr s�s�rms, tu dischar�c into a sl��nn sewcrorasuitahlr sturm�� irr.fis�,us;d I;irilit�. Surfacc Urain,+�;c R'a�cr should n�,t hr .illm„•�I w s�an�l in :�m� ;uc�u �chrrc fnn��in�s, slahs. ur �a��c�ncnt is to hc ci,nr;trurlyd. I initih pruund �urla�•c �h�nilJ hc gridcd tu �ln�� :m'a} frutn thc proposcd to�tinhc�mc LIU �'3� ASSOCIATES, INC.