2507 HOWARD AVE 2016-01-01 MF Import

Gcotechnical Lnginccrine Rcpoit I�lousing Hopc December 5, 200d RMI Filc No.2170�1 !'agc 13 disch�rge inlo tightlines Ieading to :m appropriate collection and discharge poinC Surface water drains and roof drains should nut be connectcd to wall or footing drains. Sl�hs-on-Gradc SIaUs-on-grade should be suppurted on subgradc soils prepared as described in the Site I'reparxtion and Grading subsec[ion of Ihis ieport. Whe�e moisture-conVol is important, ��c recommend that aII floor slabs be underlain by at Icast 6 inclies of free-draining sand or gravel fur use as a capillary break. We recommend tha[ the capillary brcak be hydraulically connected to [he footing drain system to nllow free drainage from under the slab. A suitable vapor barrier, such as heavy plastic sheeting (10-mil or L'iicker), should be placed over dic cap�llary brcak material. An additionnt 4-inch-thick crushed gravel blanket may be used to cover the vapor oarriec This gravel blanket is to protect the vapor barricr membrane and [o aid in curing the concrete. It will also prevcnt cement paste Ird:im� down into the capillary break [hroueh the joints or tears in dic vapar barricr. Sitc Drainagc Sur1'ace nr:��„a��: rn� tinished ground surface should be eraded such Ihat stonn water is directed to sn appropria[e sromi ��'ater collection system. Water should not be allowed to stand in any area where footings, slabs,or pavcments are to be constructed. Final site grades should allow for draivage away Gom the buildings. We suggest that the finished gruund be sloped at a minimum eradient of 3 percent for a distnnce of at least 10 feet away from the building. Surface water should bc collected by permanent catch basins and drain lines and be discharged into an appropriatc discharce systcm. Suhsurface llrain:��e: \Ve r�commend the use of footing drains around lhe planned struc[ures and retaining walls. Footing drains should be installed at least 1 foot below planned finished (locr slab. The drains should consist of minimum 4-inch-diameter, ri�id, slotted or perforated, PVC pipc surrounded by free-Jraining material, and wmpped in fil[er fabric sucl� as Mirafi I dONSL. We recommend that the Gee-draining material consist of an 18-inch-��ide zone of clean (Icss than 3 percen[ fines), granular material placed along thc back of the wall. Pea gravel is an acceptabie drain materinl or drainage cumposite may be used instead. The free-draining material shaild extend up the wali to 1 foot below the finished surface. The top foot of soil should consist RM! ASSOCIATES, LTD.