M_ZB 691 Eagle Rock Ave Engineering Forestry 3

42. 43. 44, 4.5. 4.6. 47. 4.8. Provide soil movement calculations for the proposed improvements within the limit of disturbance; > Plan S-2 provides calculations for soil removal showing that it exceeds 300 CY; therefore, a soil removal permit is required. A Soil erosion and sediment control plan with details needs to be provided and show the area of disturbance; > Addressed. Plan S-2 provides a soil erosion and sediment control plan including area of disturbance. Prior to commencing construction activities, soil erosion and sediment control measures must be in place and maintain until the disturbed ground is permanently stabilized; The project proposes to increase impervious coverage and a stormwater management system (in the form of one seepage pit with an open grate is illustrated on the Site Plan. Applicant’s professional must provide calculations demonstrating that the seepage pit has been adequately sized to accommodate runoff from the tributary drainage area; > Addressed. Plan S-1 drywell(s) calculations have been revised and used a minimum Tc of 10 minutes. Drywells shown on the proposed utility plan shoul show the limit of the 2 fi. of clean stone around the concrete tanks. In order to confirm that the seepage pit will drain within 72 hours, adequate soil permeability results documenting the depth to the seasonal high groundwater table (SHGW), certified soil log(s) or percolation test(s) at the location of the drywells need to be provided. Should test results be unfavorable, Applicant’s Professional will need to provide an alternative means to address and manage stormwater; The Site Plan show the seepage pit with an open grate allowing runoff to flow into the street. The seepage pit should have a solid cover to prevent pollutants in stormwater runoff seeping into the ground. Seepage pit is not to be connected to non- rooftop sources of runoff; > Addressed. Plan S-1 has been revised to show a solid cover and collecting roof areas. It is recommended that a seepage pit overflow pipe be provided and be connected to Eagle Rock Avenue drainage system which is located approximately 50 feet from the overflow pipe. This will prevent runoff into the roadway which might cause freezing and ponding conditions during the winter months and rain events throughout the year; > Partially Addressed. Plan S-1 has been revised to show the overflow

into the roadway which might cause freezing and ponding conditions during the winter months and rain events throughout the year; > Partially Addressed. Plan S-1 has been revised to show the overflow pipe connecting to the side of the inlet. However, plans should be revised to inverts in and out of the drywell, invert for overflow pipe connecting to existing inlet at Eagle Rock Avenue, grate elevation and invert elevation of the existing inlet AN EQUAL OPPORTUNITY EMPLOYER www.westorange.org