Accession Number:

AD1078440

Title:

Eelgrass and Macroalgae in Vicinity of the Proposed Service Pier Extension at Naval Base Kitsap Bangor

Descriptive Note:

Technical Report

Corporate Author:

NIWC Pacific San Diego United States

Report Date:

2019-08-01

Pagination or Media Count:

56.0

Abstract:

This report presents data collected by video and diver-surveys of the area near the Naval Base Kitsap Bangor Service Pier where a new pier structure extending the existing pier is proposed. The survey followed protocols developed by Naval Facilities Engineering Command Northwest and approved by the Army Corps of Engineers. The entire study area was investigated via boat-based video surveys, and then divers delineated the boundaries of and collected quantitative data within detected eelgrass primarily Zostera marina beds, as well as macroalgae beds of greater than 5 percent density that occurred within the maximum project extent boundary which included the permanent pier footprint and a temporary work zone buffer. Two eelgrass beds were detected by video and delineated and quantified by divers. Both beds occurred in the nearshore, outside of the maximum project extent. The western bed covered 0.15 acres 609 m2, with an average density of 40.9 Z. marina shootsm2. The eastern bed covered 0.26 acres 1,036 m2 with an average density of 6.7 Z. marina shootsm2. Macroalgae quantified within the western eelgrass bed covered an average of 19.5 percent of benthic substrate, and was dominated by Sarcodiotheca gaudichaudii. Macroalgae within the eastern eelgrass bed covered an average of 43.3 percent of benthic substrate, and was dominated by Ulva spp. Overall, macroalgae of greater than 5 percent density covered approximately 2.2 acres 8,892 m2 within the total survey area. Of this, 0.13 acres 520 m2 occurred within the maximum project extent itself. Most of the area of macroalgae greater than 5 percent density that intersected the maximum project extent occurred in the temporary work area 510.4 m2 whereas only 9.6 m2 occurred within the permanent pier footprint. Therefore, only 5.7 percent and 0.1 percent of the total macroalgae area delineated within the total survey area falls inside the temporary work zone and permanent project footprint, respectively.

Subject Categories:

  • Logistics, Military Facilities and Supplies
  • Construction Equipment, Materials and Supplies

Distribution Statement:

APPROVED FOR PUBLIC RELEASE