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9722-9F8 - Characterization of the Geohydrology, Ground-Water Flow System, and Ground-Water Quality of SUBASE Bangor, Kitsap County, Washington - Completed FY2003
Background - SUBASE Bangor is a 6,785 acre Navy installation located on Hood Canal in Kitsap County, Washington. Currently it serves as the home port to eight Ohio-class TRIDENT missile submarines, but historically the site served as a Naval Ammunition Depot. As a result of the historical activities at Bangor, numerous contaminated sites have been identified. Contaminants include ordnance chemicals, trace metals, chlorinated hydrocarbons, petroleum hydrocarbons, pesticides, and polychlorinated biphenyls (PCB's). The ground-water flow system at SUBASE Bangor is not understood well enough on a base-wide scale to effectively manage and plan the use of the resource. A major problem is that the effects of contamination from hazardous-waste sites on the quality of the base-wide ground-water system are unknown because the base-wide ambient water-quality and flow system are not well known. Consequently, the potential effects of proposed and ongoing remedial activities are also unknown. Other base-wide ground water issues are centered on projected demands for ground water due to residential and commercial growth on and around Bangor. Developing large water supplies may induce seawater intrusion, alter recharge to deeper aquifers, lower ground-water levels, and/or decrease flow in streams and creeks. The magnitude of these impacts and the effects of such development on contaminant migration are unknown.
Objectives - A study is proposed with the broad objective of developing a better understanding of the ground-water flow system in order to effectively manage this important resource and to address existing ground-water protection and emerging ground-water supply issues.
Approach - This would be accomplished by; 1) defining the site geohydrologic framework; 2) defining the ambient ground-water chemistry; and 3) constructing a three-dimensional ground-water flow model to describe how future pumping scenarios will change ground-water levels, how these changes will affect the migration of contaminants on a regional scale, and what effects future pumping scenarios may have on the location of the freshwater/saltwater interface.
WA183 - Water Resources of the Kitsap Peninsula and Adjacent Islands - Completed FY1980
Problem - An influx of about 50,000 people is expected on the Kitsap Peninsula in the next few years as a result of the new Trident Nuclear Submarine Base. This development will require new water supplies, and may increase the potential for induced salt-water intrusion.
Approach - Phase I of this study (preliminary appraisal) will include utilization of the existing data on rainfall, evapotranspiration, water use, ground water, and surface water. Phase II of the investigation involves test drilling, geophysics (resistivity) and additional data collection. These data will be analyzed to determine the present water use, estimate the projected water use, and determine if the local ground-water resource will be adequate to meet the demands of the Trident development.
WA172 - Movement Of Contaminants In Ground Water At Keyport Naval Training Station, Bangor, Washington - Completed FY1975
Problem - At the U.S. Naval Ammunition Depot in the vicinity of Bangor, Washington, the effluent from washing operations which contains RDX/TNT has been lagooned and ultimately leached into the soil and ground-water aquifer. The disposal site is in a recharge area of an aquifer used for domestic water supplies. Samples of the aquifer materials at the disposal site have shown concentrations of RDX and Tnt as have water samples from wells in the surrounding area. An extremely dry winter and spring has caused the navy concern over increased contamination of the aquifer. Phase II--at the U.S. Naval Ammunition Depot in the vicinity of Bangor, Washington, the effluent from washing operations which contains RDX/TNT has been lagooned and ultimately leached into the soil and ground-water aquifer. The disposal site is in a recharge area of an aquifer used for domestic water supplies. Samples of the aquifer materials at the disposal site have shown concentrations of RDX and TNT as have water samples from wells in the surrounding area.
Objectives - A three-phase investigation of the hydrologic regime in the area: Phase I - define the problem and design the work to be carried out in Phases II and III; Phase II - identification of the geohydrologic system and the movement of RDX/TNT in the system using only available data; Phase III - detailed investigation of the geohydrologic system and movement of RDX/TNT with predictions of the ultimate disposition of the pollutants. Data collection, research, and a mathematical model may be carried out as the needs have been defined in Phases I and II. Phase II--confirmation or negation of the presence of TNT/RDX in the disposal pit area and, if confirmed, determine the general direction and area of contamination and method of movement.
Approach - This investigation (Phase I) is a design project, and as such, will concentrate on a definitive examination of the problem and the formulation of the investigation. The resultant of the Phase I will be an administrative report which: (1) defines the problem within the reference frame prescribed by the available data, and (2) contains detailed project plans to be implemented in Phases II and III. Phase II--(1) drive coring of 6-8 holes about 60 feet deep in and near the disposal pit; (2) drive coring a hole 100-150 feet deep somewhat removed from the pit, for tests of aquifer characteristics; (3) analysis of cores for tnt/rdx and nature of materials; (4) sampling and analysis of ground water; (5) measurement of ground-water levels; (6) evaluation of methods of determination of TNT/RDX in water samples; and (7) intensive literature search on all facets of the investigation.