6406 HIGHLAND DR 2022-04-19 - Laserfiche WebLink

flow enters into the existing storm drainage system via a catch basin located 40 feet downstream of the property on Highland Drive (See site plan for location). 2. Please provide the following quantities of existing hard surfaces in square feet: Existing Roof Area: Existing building foot print=896 SF (Has been removed from project) Existing Other Hard Surfaces(pavement,gravel,etc.): Existing Walkway= 154 SF(to be removed) Existing Garage Concrete Slab=366 SF (to be removed) Asphalt pavement= 1,272 SF(to remain) 3. Which direction does the site currently slope?(Towards a street,towards an alley, towards a neighboring property,etc.)The site slopes towards the street from the back of the lot to the front, northwest to southeast at approximately 2%. See site plan for surveyed contours. 4. What currently happens to rainwater that falls on the site?Currently it is believed that the water infiltrates or sheet flows to the east into a shallow grass area located on the edge of the southeast property line and Highland Drive. There are catch basins to the NE and SW of the property along the west side of Highland drive. 5. Please describe any critical areas on the site (wetlands, buffers,steep slopes,etc.)This information can be obtained from the City's GIS data,and is available at the permit counter. There are no critical areas on site. 6. What types of soils are found on the site? **Note: to determine the type of soils on the site,please visit the Natural Resources Conservation Service's Web Soil Survey at http://websoilsurvey.nres.usda.gov/app/, click the green button that says Start WSS, then type in your address under Quick Navigation, create an Area of Interest(AOI)and click the second tab (Soil Map). The soil types will pop up with a hyperlink and the properties of each will be available when you click the hyperlink. Alderwood Urban land Complex, 2 to 8%and 8-15%.The soils are made up of 60% Alderwood gravelly sandy loam and 25% urban land.The soil is classified as B soils with moderately rapid permeability above the hard pan with a low water capacity.Alderwood soil is moderately deep over hand pan formed in glacial till.The surface layer is very dark grayish brown and the subsoil is dark yellowish brown very gravelly sandy loam about 23 inches thick. Depth to hardpan ranges from 20 to 40 inches.Since a soil investigation has not been conducted for the single family residence a very small infiltration rate has been used in the modeling to mimic hard pan soil conditions. Page rof7 .� - - ° - 7,t)