The two following Army documents are from the "Supplement to the Harbor Defense Project, Harbor Defenses of Sitka" dated 1944.    This is an Army status report that was classified until 1962.  This document is often referred to as the "Annexes."  I scanned the pages and cleaned up the 'dirt' from the copy machines.
 

Annex 30B

This document shows both AMTB batteries as constructed.  The one in BLUE is Whale Island, AMTB battery No. 2.  The other battery was at Watson Point.

Annex 4A