Summary

EPA is issuing a notice of proposed action under the Clean Water Act to issue a National Pollutant Discharge Elimination System (NPDES) Permit No. GU0020397 to Cabras Marine Corporation, located in Piti, Guam.

This facility is a dry dock floating in Apra Harbor in the Territory of Guam. The drydock provided ship repair and maintenance services to small vessels; e.g., tug boats, personnel support boats, government owned vessels and barges. Normal drydock activities such as abrasive blasting, pressure washing, application and removal of marine surface coat materials, hydrostatic testing, metal work, electrical work, mechanical work, material storage, and other related industrial activities occur during regular operations. Currently, all process wash water and most stormwater is captured on dry dock surface and pumped onto shore for treatment and disposal. The dry dock has been modified to capture runoff from up to but not including once in 25 year/24 hour storm events. The proposed permit renewal contains no significant modifications.