Merrill-Brown Repair AMLRP

The Mike Merrill site is located at 1846 Little Lick Fork Road, East Point in Johnson County, KY, 41612. GPS coordinates at the Merrill site are 37 45' 11.308"N, 82 50' 3.785"W. The Lee Roy Brown site is located at 1588 Little Lick Fork Road, East Point in Johnson County, KY. GPS coordinates at the Brown site are 37 45' 17.985"N, 82 49' 51.193"W. On or about May 9, 2022, a rain event caused damage to existing AML installed features at these two locations. At the Merrill site, excessive runoff bypassed the established drainage channel upstream of the work previously completed under the Mike Merrill Drainage SP AMLRP allowing the increased flow to damage the Class II ditch approximately 75 feet from the main drainage channel. The flow dislodged the Class II aggregate exposing bare earth beneath. Flow along this ditch also caused sediment to occlude the subdrain aggregate preventing infiltration. Flow along the main drainage channel eroded the channel leaving unstable sides. Downstream of the cyclopean aggregate adjacent to Little Lick Fork Road, sediment filled the previously installed gabion weir and Class II aggregate used to armor stream channels was carried and deposited at the creek channel junction. To address these issues, the stream channel above Mr. Merrill's yard will be shaped to prevent further flow leaving the established drainage channel and armored with Cyclopean Rip Rap stone and Class III stone installed as a buttress in areas where the slope above cannot be shaped to a stable configuration. The damaged section of Class II ditch will be reshaped using the existing aggregate and additional aggregate will be added as necessary. The occluded subdrain aggregate will be removed and replaced with clean aggregate. The gabion weir at the bottom of the slope (adjacent to Little Lick Fork Road) will have accumulated sediment removed and transported to the waste area and placed in a de-watering cell. Damage areas of the Class II ditch below the weir will be reshaped and armored using existing Class II aggregate that has been deposited adjacent to the creek during the rain event. At the Brown site, erosion from the areas upstream of the gabion ditch flowed along a 9 foot wide gabion ditch and material was deposited at the inlet headwall of a culvert at the bottom of the slope as well as around the immediate vicinity including Mr. Brown's carport and yard. The gabion ditch was also damaged and some of the aggregate was eroded from the mattress baskets. To address these issues, a gabion weir will be installed at the top of the gabion ditch above Mr. Brown's residence. The existing damaged gabions will be repaired by adding additional Class II to fill the cells and a new top will be installed on the baskets. Material deposited at the inlet of the culvert immediately behind Mr. Brown's carport as well as in the adjacent yard areas will be removed. All material removed from the sites will be transported to the designated waste area. All disturbed areas under this project will be revegetated using standard AML practices. A structure removal/replacement and Utility Relocation/Replacement bid items are included on this project for use in the event utility lines are encountered and damaged, structures need to be temporarily moved at the Brown site and as directed by the engineer. This project will not address underground mine openings. No trees will be disturbed outside of the unstable landslide area. All areas disturbed by this project will be revegetated by means of standard AML revegetation practices. Sediment control will be provided by installation of silt checks or silt traps downstream/downslope of the work area.

Division 01 -	General Requirements, Vehicular Access and Parking, Traffic Control, Temporary Barriers and Enclosures.
Division 02 -	Existing Conditions, Subsurface Investigation.
Division 31 -	Earthwork, Grading, Earthwork Methods.
Division 32 -	Exterior Improvements, Flexible Paving, Asphalt Paving, Rigid Paving, Concrete Paving, Paving Specialties, Pavement Markings.
Division 33 -	Utilities, Storm Drainage Utilities, Storm Drainage Structures.