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Phone: 913-715-8500

11811 S. Sunset Drive, Suite 2500, Olathe, Kansas 66061

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Nelson Complex Wastewater Treatment Facility & Service Area Long Term Capital Improvement Plan Summary Report

February 2021

NOTICE: Upcoming Release Of Request For Qualifications, Nelson Wastewater Treatment Facility Construction Manager At Risk (Cmar) Services - PDF

May 2020

Summary report - PDF

Supplemental information - PDF

The Nelson Complex service area consists of the Nelson Complex Wastewater Treatment Facility (WWTF) and two main tributary basins - Turkey Creek (SMTC) and Mission Main (MTM1). The service area, located in northeast Johnson County, is approximately bounded by 47th Street to the north, 95th Street to the south, Pflumm Road to the west, and State Line Road to the east. Metcalf Avenue roughly divides the two basins, Turkey Creek to the west and Mission Main to the east.

The WWTF was constructed in phases, beginning in the 1940’s. A significant portion of its facilities are at or near the end of their useful service life. The treatment technology currently in place is not capable of meeting future water quality standards.

The collection system was also constructed with technologies that are now outdated. As a result, it experiences significant issues related to limitations in wet weather capacity. In addition, the system contains four satellite peak excess flow treatment facilities (PEFTFs) which discharge directly to adjacent waterways during significant wet weather events after primary treatment and disinfection.

In 2018, Johnson County Wastewater (JCW) commissioned HDR, in association with CH2M and WCS, to determine the optimum solution to these issues and develop a long term capital improvement plan for the Nelson Complex service area. This study aided JCW and Kansas Department of Health and the Environment (KDHE) in negotiating the current and future Nelson WWTF permits, including planning for the future elimination of the PEFTFs. 

In 2020, JCW plans to issue a Request for Proposal (RFP) for a design engineer or design engineering team to begin preliminary design (30%) of the new Nelson WWTF.  This team will also aid JCW in the development of a separate RFP to select a Construction Manager at Risk (CMAR) to assist in the preliminary design process.

Questions regarding this study and/or the upcoming RFP should be directed to:

Patrick Denning, PE
Assistant Chief Engineer – Existing Infrastructure

4800 Nall Ave.
Mission, KS 66202
Office: 913-715-8562