Specific Project Elements. Collection and Conveyance System o Stormwater will be diverted from the existing local storm drain system and directed to the park. Diversions will be constructed along storm drains to capture water quality flows and they will be conveyed to the park in new storm drainpipes. • Pre-Treatment Unit (Hydrodynamic Separator) o Diverted stormwater will flow through a pre-treatment unit, likely a hydrodynamic separator, prior to entering the underground storage vault. The purpose of this pretreatment is to remove debris and sediment to limit maintenance in the vault. • Underground Storage Vault for Water Quality Treatment (infiltration) o Stormwater will be collected in an underground storage vault where it will be held while it infiltrates into the soil. The vaults will be sized to capture runoff from the 85th percentile storm. • Harvest and Use (passive turf irrigation) o A passive irrigation system consisting of shallow storage below the turf will be provided to irrigate the field using captured stormwater. This approach allows for use of stormwater for irrigation, which displaces the use of potable water. • Multi-lingual interpretative signage / displays o This project will be located underground once complete. Signage and displays will be incorporated into the park to help residents learn about the system and what they can do to improve the quality of urban runoff in their area. Signage associated with the SEP shall state in a prominent manner that the project is being undertaken as part of settlement of a Regional Water Board enforcement action. Some project elements will require long-term maintenance, which the City will perform after completion of the SEP on a regular schedule. These activities are described here for informational purposes and are not considered part of the SEP’s Scope of Work. • Collection and Conveyance System o The collection and conveyance systems will require maintenance similar to what the City currently provides for catch basins and storm drains. Maintenance will focus on debris and sediment removal to ensure design capacity and function remain intact. • Pre-Treatment Unit (Hydrodynamic Separator) o The pre-treatment unit will require clean out by vacuum truck prior to each wet season. Additional maintenance may be required depending on the amount of runoff generated each year. The unit is accessible via manhole at the ground surface. • Underground Storage Vault for Water Quality Treatment (infiltration) o The underground storage v...
Specific Project Elements. The County s bioreactor pilot project will involve injecting a controlled amount of liquids through injection devices into a small portion of an individual subcell for up to a seven-year period (depending on effectiveness), and monitoring the settlement and LFG that results. The objectives of the project are as follows:
Specific Project Elements. Please se section V.D. and the Appendix for an expanded schedule and milestone descriptions.
Specific Project Elements. Buncombe County intends to construct and operate a combined leachate recirculation and gas recovery system throughout its 100-acre Subtitle D landfill area. Currently, Cells 1-3 of the 10- cell design are in operation. These cells cover approximately 23 acres. Cells 4 and 5, which will cover approximately 20 acres, are expected to be under construction by mid-summer 2000 and in operation one year later. Cells 1 and 2 were constructed with the standard Subtitle D composite liner while Cells 3-5 were/will be constructed with an alternative liner approved by the NCDENR. Because of the presence of the separate alternative ground water monitoring system beneath each cell, the performance of the two types of liner systems can be evaluated as increased amounts of liquid are introduced to the cells.
Specific Project Elements
