M_ZB 15 N Edgewood Avenue Memo2 Revised

AN EQUAL OPPORTUNITY EMPLOYER www.westorange.org 3.9 In order to confirm that the drywell 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; 3.10 The plan shows two (2) drywells with an open grate while the detail shows an inspection port. The drywell should have a solid cover to prevent pollutants in stormwater runoff seeping into the ground. Drywell is not to be connected to non- rooftop sources of runoff; 3.11 It is recommended that the drywells be provided with an overflow pipe and be connected to the existing roof leader pipe that daylight at the granite block curb;  Partially addressed. Roof leaders are tied into the drywells and an overflow pipe is shown to connect to the street. Details and plans need to show invert elevations and slopes for PVC pipes. Detail also needs to show 2’ minimum separation from groundwater and include a note. 3.12 The plan provides calculations for the drywells for 3 inches. It is recommended that 6 inches is used to approximate the 25-year storm;  Addressed by Applicant’s Professional. Six inches were used to calculate drywell’s capacity in the event of a 25-year storm. 3.13 The Applicant’s professional is responsible for ensuring the effectiveness of proposed drywell and provide sufficient regular oversight during its construction; 3.14 A Certification stating that the drywell was constructed according to the design is to be submitted by the Applicant’s professional; 3.15 The Applicant/Owner will be responsible for ensuring that the drywell is regularly and effectively maintained without negative impacts to neighboring properties;  Addressed. Note #13 on SP-1 is provided addressing that the applicant will be responsible for regularly and effectively maintaining the drywell without negatively impacting adjacent properties. 3.16 The following additional information should be provided in the stormwater maintenance manual:  Name and phone number of the person(s) responsible for maintenance  Map to scale showing the location of the drywells  Maintenance for drywells structural components should include at

ance manual:  Name and phone number of the person(s) responsible for maintenance  Map to scale showing the location of the drywells  Maintenance for drywells structural components should include at least annual inspection for cracking, subsidence, and erosion  Maintenance for components that could clog the drywells should be included  Replacement of damaged components  Additional maintenance guidance is available at NJDEP New Jersey Department of Environmental Protection: https://www.nj.gov/dep/stormwater/