Data on quantity and quality of water flowing in drainage systems of dry docks at Puget Sound Naval Shipyard, Bremerton, Washington, 1994

Abstract

Data on the quantity and quality of ground water that drains into dry docks at the Puget Sound Naval Shipyard can be useful for planning environmental remediation work at the shipyard. Ground-water discharges into and total drain-water discharges from individual dry docks were computed from a single set of discharges of individual inflowing drains' and outflowing drain-water collection culverts that were measured in June, July and August 1994. Ground-water inflows to dry docks no. 1, 2, 3, 4, 5, and 6 equalled 0.07, 0.30, 0.29, 0.61, 1.18, and 6.2 cubic feet per second, respectively, and total drain-water discharges from the dry docks equalled 0.07, 0.30, 0.33, 0.61, 1.36, and 11.7 cubic feet per second, respectively. The differences between total outflows and ground-water inflows were mostly cofferdam and floodgate leakage and cooling water from a ship in dry dock no. 6. Observed salinities indicate that 18, 92, 28, 44, 55, and 69 percent of the ground-water inflows to dry docks no. 1 through 6 and 18, 92, 37, 44, 63, and 82 percent of the total outflows from the dry docks was saline water from Sinclair Inlet. Concentrations of total copper in samples from 36 sites varied from less than 1 to 71 micrograms per liter, and concentrations of total lead varied from less than 1 to 44 micrograms per liter. None of 43 semi-volatile organic compounds that were analyzed for in samples from 19 sites were detected at concentrations greater than the laboratory minimum reporting level (5 or 10 micrograms per liter). A total of 13 volatile organic compounds were found at concentrations greater than laboratory minimum reporting levels (mostly 0.2 microgram per liter) in 8 samples that were analyzed for 63 volatile organic compounds. Trichloroethene and at least three other chlorinated hydrocarbons were found in each sample.