21 Apr 2020

P-3068r

Expiration date: 5/12/2020

This project originally went out for Public Notice on October 31, 2017, however due to length of the duration for the anticipated project and a modification of the finalized plans; You are invited to review and comment on Public Notice P-3068 The applicant seeks authorization to construct an approximate 600-foot long, earthen dam across the western end of a small valley containing an unnamed tributary to Belews Creek. Construction of the dam will create an approximately 9.03-acre lake. A 190-foot drain pipe will be placed under the dam and discharge into the unnamed tributary at the edge of the southern berm of the dam. An emergency spillway is proposed at the southwest corner of the lake and will drain northwest into the unnamed tributary, approximately 200 feet downstream of the lake outflow pipe. Construction material necessary for the dam will be excavated on-site. The revised lake plan is depicted on an aerial photograph and enclosed as Figure 2. Based on the proposed dam height and revised site plan, approximately 1,980 linear feet (LF) of the unnamed intermittent tributary will be impacted by dam construction, inundation and piping. The proposed lake will be constructed approximately 1.8 miles northwest of Hillsboro, Missouri (38.25518,-90.57924). More specifically, the proposed project is located in Section 28, Township 41 North, Range 04 East, Jefferson County, Missouri. Written comments must be submitted by replying by electronic mail or written mail to the address in the notice. The Public Notice comment period opens April 22, 2020 and closes May 12, 2020.

1 Apr 2020

P-3083r

Expiration date: 4/22/2020

The applicant seeks authorization to conduct grading and excavation operations within waters of the United States to modify an unnamed intermittent tributary, for the purpose of increasing capacity, and to better manage the amount of runoff flowing through residential properties. The proposal plans for the improvements of approximately 600 feet of channel, with a modification that includes the widening and creation of a shallow trapezoidal channel, to contain 15-year and 100-year design storms. The modified channel would have a bottom width of six feet, a minimum depth of two feet, and side slopes re-shaped 2:1 (h:v). Also, approximately 184 feet of 2-3 foot tall modular block wall would be installed along the left descending bank to minimize impacts to private property. The vacant lot located at 6906 Roland Blvd. will be used as storage in the form of a floodplain bench. Additionally, the project involves 1800-feet of new gravity sanitary sewer ranging in size from 8-inch to 15-inch and the abandonment and filling of existing sanitary sewer ranging in size from 8-inch to 12-inch. The proposed sanitary sewer will run approximately along the same alignment; however, along Winchester Drive the new sewer will be placed across an unnamed tributary. Written comments must be submitted by replying by electronic mail or written mail to the address in the notice. The Public Notice comment period opens April 1, 2020 and closes April 22, 2020.