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|Title:||Evaluation of upland disposal of Richmond Harbor, California, sediment from Santa Fe Channel|
|Authors:||Lee, Charles R.|
Brandon, Dennis L.
Tatem, Henry E.
Skogerboe, John G.
Brannon, James M.
Myers, Tommy E.
Palermo, Michael R.
|Keywords:||Dredging spoil--California--Richmond Region--Environmental aspects|
Dredging--California--Richmond Region--Environmental aspects
Intracoastal waterways--California--Environmental aspects
|Publisher:||Environmental Laboratory (U.S.)|
U.S. Army Engineer Waterways Experiment Station.
|Series/Report no.:||Miscellaneous Paper (U.S. Army Engineer Waterways Experiment Station.) ; no. Miscellaneous Paper EL-93-18|
|Abstract:||This report describes testing and evaluation performed by the Environmental Laboratory of the U.S. Army Engineer Waterways Experiment Station (WES) on sediment from the Santa Fe Channel of Richmond Harbor, California. Test protocols from the Corps' Management Strategy for Disposal of Dredged Material were used in the present evaluation to determine the potential for migration of contaminants into the effluent, surface runoff, and leachates at an undetermined upland disposal site. The upland site would be managed such that plants and animals would not be allowed to colonize the site. Therefore, plant and animal bioassays were not performed. Sediment was collected from Santa Fe Channel from core depths to -38 ft and transported to the WES for testing. Santa Fe Channel sediment metal concentrations were found to be in the range of those found in normal agricultural soils with the exception of nickel. Santa Fe Channel sediment contained nickel concentrations at the maximum concentration allowed in soils for agricultural production. Sediment butyltin concentrations were low, at 15 ppb, but were higher than those found at an upland reference disposal site at Twitchell Island. Santa Fe Channel sediment contained some polycyclic aromatic hydrocarbons (PAHs) at concentrations higher than Twitchell Island and were generally elevated in PAHs compared to other reference sediments. Santa Fe sediment contained 185 ppb DDT, and 202 ppb DDD, which has given rise to concern. Effluent and surface runoff test results indicated no toxicity to sensitive aquatic organisms. Copper concentrations in effluent and arsenic in surface runoff were the only parameters exceeding assumed criteria or standards. A mixing zone of 2 to 1 for copper and 3 to 1 for arsenic will eliminate any potential water quality impacts. Leachate test results indicated a potential for arsenic and chromium to leachate eventually in concentrations that may exceed the assumed drinking water quality criteria. The time required to reach maximum leachate contaminant concentrations may be on the order of hundreds of years, depending on climatic conditions and disposal site-specific engineering controls. Leachate generation rates can be reduced by reducing the surface area of the disposal site and by constructing a composite liner. In summary, Santa Fe Channel sediments will require management of suspended solids in effluent and surface runoff and a mixing zone of less than 10 to 1 to meet the strictest assumed water quality criteria or standard. Depending on the location, the confined disposal site should have a reduced surface area and a composite liner to control leachate migration, especially if leachate can migrate to surface receiving waters.|
|Gov't Doc #:||Miscellaneous Paper EL-93-18|
|Rights:||Approved for Public Release; Distribution is Unlimited|
|Size:||234 pages / 12.40 Mb|
|Types of Materials:||PDF/A|
|Appears in Collections:||Miscellaneous Paper|
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|Miscellaneous Paper EL-93-18.pdf||12.7 MB||Adobe PDF|