Specifications include, but are not limited to: This project will address drainage problems caused by drainage from the coal seam behind the property located at N37.58426º, W82.25032°. The site is adjacent to the Jessica Hackney Drainage AMLRP. Install an 18” RCP culvert under the county road and concrete headwall into the stream bank. Bed the RCP in flowable fill and install the concrete headwall recessed into the stream bank and below the existing grade. On the upstream end, install a concrete dropbox. There is a gas line running along the county road. Place the concrete dropbox between the gas line and the county road if possible. From the concrete dropbox back to the hillside, install a perforated subdrain ending in a plastic dropbox. Geo-grid and filter fabric are included to construct a temporary access to the backyard. Across the backyard, construct a combination ECB ditch and subdrain tied together at the plastic dropbox. Excavate the wet muck along the hillside behind the subdrain. Excavate and attempt to open a reported closed and covered mine entry. Install subdrain into the entry area (regardless if open or collapsed) and backfill with class II. Tie the portal drainage into the backyard subdrain via a plastic dropbox. Construct a 2:1 gabion wall and backfill with class II. Set the gabions on a class II backfill and bi-axial geo-grid pad.
