1136706 - Lake Hallowell Sediment Removal Project

Montgomery County intends to enter into a firm-fixed-price, Unit Price Contract with a qualified firm to provide construction and construction-related services including but not limited to the construction, repair, retrofit, alteration and modernization for:
The Lake Hallowell Maintenance Sediment Removal Project involves removal of approximately 11,000 cubic yards (CY) of accumulated sediment from the southern portion of Lake Hallowell (the Lake) and replacement of the Principal Spillway valve located in the north portion of the Lake. The removed sediment shall be dewatered on Site and transported off Site to an approved disposal facility. Work to be completed by the Contractor consists of, but is not limited to, the general activities listed below. Note that the list below shall not be considered all-inclusive of the Work to be completed by the Contractor under the Contract.
1. Upland Construction, which consists of, but is not limited to:
a. Installation of upland temporary erosion and sediment controls.
b. Clearing, grubbing, site grading, and construction of the Staging Area, Construction
Access Road, and Lake Access Area.
2. Replacement of the Principal Spillway Lake drain valve (valve), located in the northeastern
corner of the Lake.
a. Lake drawdown using the newly installed valve in accordance with these Specifications
and the Contract Drawing to allow for sediment removal to be conducted in the dry.
3. Installation of temporary in-Lake erosion and sediment controls to maintain dry conditions in the
sediment removal footprint throughout operations.
4. Phased sediment removal from the sediment removal footprint.
5. Transport of removed sediment from the sediment removal footprint to the Stockpile and
Dewatering Area located in the Staging Area for additional dewatering and stabilization, as
necessary.
6. Dewatering and stabilization of the removed sediment to pass a Paint Filter Liquids Test and
other testing required by the disposal facility
7. Transportation of dewatered sediment from the Site to the approved disposal facility.
8. Site cleanup and restoration of areas impacted by construction activities, including the removal
of temporary construction controls and facilities.