Amendment 0004_P-104.pdf

This document is a technical specification drawing for sediment management and erosion control infrastructure. The drawing depicts two primary components: a sediment stockpile area and a silt curtain system, both shown in plan and detail views without specific scale.

The sediment stockpile area design includes contractor-installed stockpile components with a diffusing membrane beneath the stockpile, underlustrated ground, and stripping pads around the perimeter. The specifications note that all stumps and objectionable material must be removed from the stockpile area before the impermeable membrane is installed. Contractors are required to sample and test stockpile material at a certified laboratory and submit test results with a manifest for proper transport and disposal. The specifications mandate that the stockpile area must be inspected and certified monthly, with restrictions on contaminated material remaining in the area. Contractors must restore the area to original conditions following material removal and provide weather monitoring coverage.

The silt curtain detail specifies a barrier system with high-strength nylon reinforcement material and geotextile properties suitable for sediment containment in water. The design includes anchoring mechanisms with snap hooks and galvanized chain, dual-size steel guides with polyester coating, and specific curtain depth measurements. Notes indicate the silt curtain shall suction extend to river bottom, with contractor selection of appropriate curtain type based on water specifications, anchor spacing, barrier length, and current load requirements. The drawing is identified as sheet P-104, 4 of 4, and bears the seal of the New York District.