931 BROADWAY TEUTSCH STUDENT HOUSING 2018-03-07

the upper 2.0' of soils on the site. The existing soil must be tested prior to mass excavation to determine whether the soils contain arsenic and/or lead levels that require further actions such as the preparation of a plan for worker protection and soil disposal sites and/or methods. The completed geotechnical report is included as Appendix G. 2.4 GROUND COVER The existing site is almost entirely covered by impervious surface (88% of the total lot area).The surface coverage types are summarized in Table 2-1 below. Refer to Appendix A for a map of the existing surface coverages. Table 2-1: Existing Surface Coverage . Area (SF) Rooftops 7,523 Pollution Generating Impervious Surfaces 4,911 Non-pollution Generating Impervious Surfaces 742 Landscape 1,814 Total Site Area 14,990 There are several significant trees on the site, clustered in the northwest corner and along the south property line. Other vegetation is limited to small planter areas adjacent to the building and along the southern property line. 2.5 CRITICAL AREAS There are no critical areas on or adjacent to the project site. 2.6 ADJACENT AREAS The site is bordered by a bus transit center to the north, an alley to the east, 10t''St to the south, and Broadway to the west. 3 SITE DEVELOPMENT PLAN WITH ON-SITE STORMWATER MANAGEMENT t This project is required to evaluate the feasibility of Onsite Stormwater Management BMPs (Minimum Requirement#5). Due to the limited setback of the building from the property line (0' - 12')the required setback of 10' from any structure or property line for Onsite Infiltration Areas, Raingardens, Downspout Dispersion Systems, Concentrated Flow Dispersion, or Sheet Flow dispersion cannot be met. Additionally, site is underlain by very dense glacial till which indicates that there is little potential for stormwater infiltration. The Onsite Stormwater Management BMP that will be implemented is BMP 12.20- Post- Construction Soil Quality and Depth.This includes all proposed landscape and lawn areas. EVCC STUDENT HOUSING-STORMWATER SITE PLAN-REVISED.DOCX 6 �