Sediment Removal. Sediment within the portion of the Island that is emergent during typical low-flow conditions (e.g., the visible portion of the island) will be removed. Sediment located above the water level during low water conditions (approximately elevation 579 feet NAVD88, corresponding to the median low water surface elevation) will be excavated, corresponding to an approximate volume of 100 to 200 cubic yards (cy). Excavation of the visible island will be performed under dry conditions using conventional earthwork equipment working from a temporary platform or access road constructed within the river. Appropriate construction best management practices (BMPs) will be used to minimize the disturbance of submerged sediments during excavation activities. Removed sediments will be characterized and transported for disposal to a CERCLA approved landfill. Woody vegetation and debris on the Reach MM Island will also be removed, processed by a chipper, and disposed with the sediment. All waste will be disposed of in compliance with the EPA Off-Site Rule 40 C.F.R. Section 300.400.
Sediment Removal. Total amount of accumulated sediment removed from the storm water treatment measure(s) during the reporting period: cubic yards. How was sediment disposed? £ landfill £ other location on-site as described in and allowed by the maintenance plan £ other, explain:
Sediment Removal. BMPs will trap sediment and other settleable material over time and this material should be removed once the storage capacity has been reduced by 33%. Removal of the sediment shall occur no less frequently than once ever year or as specified by the manufacturer. If a forebay exists, any trash, sediment, or other debris should be completely removed as discovered through routine maintenance activities or inspections.
Sediment Removal. When infiltration rates impeded or sediment is 2 inches. Care shall be taken to ensure that the swale is not being compacted during removal process.
Sediment Removal includes the following work per the CONTRACT DOCUMENTS: remove wood and sediment at designated flood chute entrances and sediment bars. Create three (3) temporary stream crossings to reach sediment material to be removed.
Sediment Removal. Sediment removal is necessary to maintain the original design volume of the EDB and to ensure proper function of the infrastructure. Regular sediment removal (minor) from the forebay, inflow(s), and trickle channel can significantly reduce the frequency of major sediment removal activities (dredging) in the upper and lower stages. The minor sediment removal activities can typically be addressed with shovels and smaller equipment. Stormwater sediments removed from EDBs do not meet the criteria of “hazardous waste”. However, these sediments are contaminated with a wide array of organic and inorganic pollutants and handling must be done with care. Sediments from permanent pools must be carefully removed to minimize turbidity, further sedimentation, or other adverse water quality impacts. Sediments should be transported by motor vehicle only after they are dewatered. All sediments must be taken to a landfill for proper disposal. Prompt and thorough cleanup is important should a spill occur during transportation.
Sediment Removal. Sediment removal is necessary to ensure proper function of the grass swale or buffer. Care should be taken when removing sediment to prevent damage to the turf grass and surrounding areas. Excessive amounts of sediment are an indication of upstream erosion or lack of adequate BMPs during construction activities. Causes for contributions of excess sediment should be investigated and addressed.
Sediment Removal. Although BRCs/PLDs should not be utilized in areas where large concentrations of sediment may enter the BRC/PLD, it is inevitable that some sediment will enter the BRC/PLD.
Sediment Removal. The horizontal screen design must include means to simply and directly remove sediment accumulations under the screen, without compromising the integrity of the screen while water is being diverted.
Sediment Removal. 1. A sediment clean out cycle of 10 to 15 years is recommended. Sediment removal may be necessary prior to 10 years if there is a substantial amount of land disturbance occurring within the contributory watershed. Annual inspections shall be made to ensure that the design depth of the permanent water pool is maintained.
