DRAFT: Proctor Dam Safety Modification Project, Comanche, Texas

Amend 01 - DELETE: Please confirm if your firm will perform the following work as a prime contractor or as a subcontractor. If work will be performed as the prime contractor, does your firm have a pool of qualified subcontractors who can perform some or all of the following work: Placing compacted engineered fill. Lime treating fill for placement. Constructing a bio polymer stabilized trench Dewatering utilizing wellpoint. See attahed Amendment 01 highlighted in RED. --------------- Proposals are not being requested at this time. This is for Sources Sought Information only. See attachment. SCOPE OF WORK: Proctor Dam is a high hazard dam located in Comanche County, on the Leon River, about three miles west of the unincorporated community of Proctor, and eight miles northeast of the town of Comanche, Texas. The dam consists of an embankment, a low-flow outlet works, a 20-foot-wide service road on top of the dam, and a gated concrete ogee spillway structure. The embankment is a rolled earthfall structure that is 13,460 feet long, including the spillway, and reaches a maximum height of 86 feet above the riverbed. An inverted filter berm and seepage collection system were constructed in 2013 along the downstream embankment toe in the terrace and transition sections.The construction project will address internal erosion in the foundation during extreme floods. The plan addresses internal erosion by constructing a filter trench collection system, installed just downstream of an existing shallow collection trench, in the transition section and increasing the thickness of the weighted filter berm (placed in 2013). The construction will include approximately 900 feet of biopolymer filter trench to a depth of up to 35 feet; a braced excavation drain collector pipe system with a two stage filter up to 12 feet deep; a compacted berm of approximately 40,000 cubic yards of engineered fill of which approximately 1/3 will be lime treated; dewatering system; and associated borrow and haul route work.