2205 BROADWAY 2016-01-01 MF Import

LSI - ADAPT Rockeries If rockeries are to be used on this project,we recommend that a setback for foundation elements be provided for all strucrures. We recommend that building limits in these a�•eas be located at or behind a point such that a slope inclined at 1H:1V extended upwards frcm the base of the rockery would not encounter any foundation elements. We recommend that all rockeries be placed in accordance with cunent Ciry of Everett specifications and be limited to the restrictions stated therein. A copy of City of Everett rockery design diagram is includal in Appendix D of this report. Rockeries should be consWcted only with sound,durable rock. Drainage provisions and building and parking setbacks are provided in local codes and standards. Depending on the rockcry loca:ion and application, reinforcing material and select fill behind the rockeries may be rcquircd. Although commonly uscd in the Northwes4 it should be noted that unreinforced rockeries are actually landscape features rether than engineercd retaining slructures. Their primary function is to provide a facing for otherwisc slable slopes and to protect them from erosion and sloughing. As such, the materials in a rockery face cut slope should consist of relatively dense strata. It should also be realiud that rockeries,even when diey are properly conswcted, will require occasional maintenance. Therefore, rockeries should be located so ihat thcy arc readily accessible for a conhactor's equipment should repairs become necessary. Drainage Minor groundwater sccpage was encountercd in one of thc sile test borings at a depth oC about 6 feet bgs. Therefore, it appcars unlikely lhat groundwater will be present at or above proposed grade levels for the propostd retail Uuildings. However, due to the silt-ricli nature of lhe near surface soils, we recommend the installation of footing drains around the perimeters of the building foundations. T7ie drains should consist of a minimum 4-inch diameter perfbratcd PVC pipe placed in a bed of pea gravel located at lhe invert elevation of the footing. The pea gravel should contain less than 3 percent by weight passing the No. 200 Sieve, based on the minus ilvee-quarter-inch fraction. The perforated dnin lines shall then be tightlined to the establishcd stormwater collection system. Roof downspouts should be tightlined separately to dischazge in'o the stormwater collection system. Cleanouts should be instatled at strategic locations to allow for periodic maintenance of the downspout and footing drain tightline systems. The site should be graded such that surface water is directed away from lhc building areas. Water must not be allowed to stand in any area where footings, slabs, or pavements are to be construct^d. During conswction, loose sw f'aces should be sealed at night by compacting the surface to re�uce the putential for moisture infillralion into lhe soils. Final sitc grades must allow for drainage away from the building � foundations. We suggest that the ground be sloped for a distance of at least ten feet away from the buildings. � L51•ADAPT Job No.WA02-6127 Page 1� ` Augusl6,2002