Site work and renovation of a water / sewer project in Greenwich, Connecticut. Completed plans call civil work for a dam / floodwall.

Project scope includes but is not limited to improvements to existing reservoir dam. Question Deadline 04/10/2024 XISTING SYSTEM DESCRIPTION A. Brush Reservoir Dam is a concrete dam with a broad crested concrete overflow spillway weir at the left abutment. The dam is a Moderate Hazard (Class BB) dam. The dam is anticipated to overtop by approximately 0.8 feet during the 100-year design storm event. The dam is approximately 243 feet long and up to 23 feet high. The spillway has approximately 2.5 feet of normal freeboard and is 30 feet in length. The upstream and downstream faces are covered by a failing shotcrete surface, and the crest has a bituminous overlay. The dam has two inoperable intake valves, one low-level outlet and one raw water line. The impoundment is a former water supply reservoir that serves to store a relatively small volume of water that discharges to Gray's Pond Brook and conveys flow to Bargh Reservoir (an active drinking water reservoir). The Work includes, but is not limited to, the following major items: a. Install erosion and sedimentation controls. b. Install construction access road. c. Clear and grub trees, stumps, and brush within 25 feet of the dam. d. Implement and maintain control of water. e. Demolish existing training walls, spillway weir, and portions of dry stack stone masonry road walls. f. Demolish existing valve operators and corbels. g. Demolish top 2.5 feet of dam crest and install 1.5 feet of new concrete cap. h. Demolish existing dam concrete to bedrock where detailed on plans. i. Demolish upstream shotcrete facing and unsound concrete. j. Excavate fill, remove rock and pour concrete for the spillway channel. k. Install reinforced spillway concrete. l. Install new reinforced concrete training wall to form the right side of the spillway channel and left boundary of the downstream rip rap buttress. m. Install upstream concrete repairs and waterproofing. n. Install downstream rip rap buttress. o. Install upstream rip rap at new spillway section. p. Extend downstream 20-inch low-level outlet pipe, fittings, and install outlet end section. q. Abandon and plug existing raw water line through dam. r. Install low-level outle