Completed in 2013 > EIS/OEIS > Proposed Action and Alternatives
Proposed Action/Purpose and Need
ShipThe Navy’s Proposed Action is to conduct training and testing activities—which may include the use of active sonar and explosives—primarily within existing range complexes and operating areas located along the coast of Southern California and around the Hawaiian Islands. Navy operating areas include designated ocean areas near fleet homeports. The Proposed Action also includes activities such as sonar maintenance and gunnery exercises conducted concurrently with ship transits and which may occur outside Navy range complexes and testing ranges. The Proposed Action includes pierside sonar testing conducted as part of overhaul, modernization, maintenance, and repair activities at shipyards and Navy piers.

The purpose of the Proposed Action is to conduct training and testing activities to ensure that the Navy meets its mission, which is to maintain, train, and equip combat-ready naval forces capable of winning wars, deterring aggression, and maintaining freedom of the seas. This mission is achieved in part by conducting training and testing within the Study Area.

Three alternatives were considered for evaluation in the Final EIS/OEIS to help determine the appropriate level and types of training and testing activities required to meet the needs outlined above. The alternatives analyzed in the Hawaii-Southern California Training and Testing EIS/OEIS are as follows.


No Action Alternative – Continues current (baseline) training and testing activities, as defined by existing Navy environmental planning documents, including the HRC EIS/OEIS, the SOCAL Range Complex EIS/OEIS, and the SSTC EIS. The baseline testing activities also include those testing events that have historically occurred in the Study Area and have been subject to previous analyses.


Alternative 1 Overall expansion of the Study Area plus adjustments to types and levels of activities, from the baseline as necessary to support current and planned Navy training and testing requirements. This alternative considers:
  • activities conducted throughout the expanded Study Area; and
  • mission requirements associated with force structure changes, including those resulting from the development, testing, and ultimate introduction of new platforms (vessels and aircraft) and weapon systems into the fleet.

Alternative 2 (Preferred Alternative) – Consists of all elements of Alternative 1 plus the establishment of new range capabilities, modifications of existing capabilities, and adjustments to types and levels of training and testing.