Summary: As a City founded over 150 years ago, much of Atchison was originally built utilizing a single, combined sewer system. That infrastructure was great in the late 1800’s and early 1900’s, but not so great following industrialization, the Clean Water Act, and subsequent water quality standards. A combined sewer system works just fine during dry weather when all the wastewater flows to the Wastewater Treatment Plant and is cleaned up prior to discharge. However, during wet weather, the capacity of the combined system is flooded, resulting in overflows of untreated sewage into White Clay Creek and the Missouri River.
About 10 years ago, the EPA and the Kansas Department of Health & Environment (KDHE) got serious about forcing Atchison to make more substantial progress toward remediation of the combined sewer system. The City and KDHE engaged in negotiations to finalize a Consent Agreement and Final Order (CAO). The CAO became effective on December 14, 2011 and contains a series of requirements for improvements and progress that must be achieved within certain timelines.
The CAO specifically mentions the next priority for the City is to be remediation of the combined sewer overflows in both the 11th and 14th Street sewersheds. For KDHE, 11th and 14th Street are the most immediate priority because overflows occur in the open waters of White Clay Creek, whereas the other overflow points occur within the confines of the box culvert that contains White Clay Creek between the Missouri River and 7th Street.
Given the hydraulic modeling and flow monitoring data collected by Burns & McDonnell, a consulting engineering firm, staff believes that overflows from Watershed Dam 6 are the single largest contributing factor to overflows in the 14th Street sewershed, making it a natural place to begin work in that area.
Cost: Preliminary Engineering ($140,000), Phase 1 Design Engineering ($112,000), Construction (TBD)
Funding: This project is entirely funded by the City of Atchison Wastewater/CSO Capital Improvement Fund.
Location: The project needs to connect White Clay Creek (on the south side of Main Street) to the Dam 6 Overflow location near the intersection of 16th Street and Atchison Street.
Contractor: To Be Determined
Status: Design Engineering (BG Consultants)
Construction Start Date: Phase 1 – Spring/Summer 2018, Phase 1 – 2019
Completion Date: Year end 2018