Environmental Sciences Division Publication No. (ORNL), Oak Ridge, TN (United States) OSTI Identifier: 6147322 Report Number(s): ORNL/TM-11135 ON: DE89012817 DOE Contract Number: AC05-84OR21400 Resource Type: Technical Report Resource Relation: Other Information: Portions of this document are illegible in microfiche products. Publication Date: Mon May 01 00:00: Research Org.: Oak Ridge National Lab. This suggests that Middle Loch effectively traps all the /sup 7/Be through adsorption onto suspended matter and deposition to the sediments. The concentrations of /sup 7/Be closely match the expected input based on rain-bucket data. High /sup 7/Be more » inventories beneath the ships and at the mouths of the streams suggest that these are areas of rapid sediment accumulation, or sediment focusing. Beryllium-7 was detected at eight of the ten sample sites within Middle Loch and in all stream samples. The presence of the natural, short-lived (53-d half-life) radioisotope /sup 7/Be was used to identify sites where the sedimentary material was recently deposited (i.e., within the past 3 months) and to identify patterns of recent sediment accumulation. High aluminum-to-calcium ratios and high organic carbon concentrations are associated with terrigenous material carried into Middle Loch by the streams. Major elements (aluminum and calcium) as well as organic and inorganic carbon were used to help characterize sediment composition and source.
Sediment samples from ten locations within Middle Loch and from two locations in each of the two major streams entering the loch were analyzed for radioisotopes and metals. Secondary objectives were (1) to identify and quantify all major sources of trace metal contamination in Middle Loch and (2) to determine if trace metal concentrations in Middle Loch have declined following termination of direct discharges from the Pearl City Sewage Treatment Plant. The primary objective of this project was to determine whether current operations of the Naval Inactive Ships Maintenance Facility contribute significant trace metal contamination to Middle Loch of Pearl Harbor.
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