Notice of Public Comment Period and Public Meeting for the NPDES Stormwater Discharges from MS4 Pollutant Reduction Plan (PRP) for Borough of Ambler. Click on this headline to access Legal Notice and PRP. The PRP outlines the measures the Borough intends to implement to reduce certain pollutants discharged from the municipal separate storm sewer system (MS4). Interested persons may submit written comments during the public comment period of August 1 – 30, 2017. Written and verbal comments will be accepted at the public meeting scheduled at Ambler Borough Hall on August 15, 2017 (7 p.m.)