Fifth Supplement to NPDES Permit Renewal Application

fifth supplement to its April 23, 19981 application to renew National Pollutant Discharge Elimination System (NPDES) Permit No. NH0020338 for Seabrook Station, a nuclear electric generating facility located in Seabrook, NH. At Seabrook Station, plant discharges to the ocean environment are through the cooling water system discharge transition structure (NPDES Outfall 001). A number of internal water streams that flow to Outfall 001 are also identified and controlled in the permit. The purpose of this supplement is to request changes to the Outfall 001 requirements as well as the internal water streams. This supplement makes the following changes to the April 23, 1998 NPDES Permit Renewal Application: 1. An increase to the Discharge Limit for Methoxypropylamine (MPA) as a chemical in the discharge from Outfall 001 (Circulating Water System). 2. Addition of EVAC Molluscicide as a chemical in the discharge from Outfall 001 (Circulating Wate