Summary

EPA is issuing a notice of proposed action under the Clean Water Act to issue a National Pollutant Discharge Elimination System (NPDES) permit MP0020397 for its discharges via Outfall 001 to:

Mobil Oil Mariana Islands, Inc. – Mobil Oil Saipan Terminal
Petroleum Lane
Puerto Rico Village, MP  96950

The Mobil Saipan Terminal is a petroleum bulk storage and distribution terminal located at the Saipan Seaport in the Commonwealth of the Northern Mariana Islands.  Discharges from the facility flow directly into the Port’s storm sewer and then to the Tanapag Harbor.  Discharges consists of stormwater, storage tank bottom water draws, hydrostatic testing, firefighting and system tests, service water system leaks, and maintenance activities.  Most discharges consist of stormwater (i.e. 90% of flow) and therefore, flows vary.  The stormwater flows come from 157,707 square feet and do not come into contact with stored materials.  Stormwater flows in 2013 and 2014, were, on average, 7,833 and 12,803 gallons per day, respectively.