The DC-02 & DC-03 diversion structure (also known as the Pendleton diversion structure) was designed to divert flow from the trunk sewer to the Deer Creek Sanitary Tunnel during storm events.
The Deer Creek Sanitary Tunnel is designed to store peak flows from the existing collection system that exceed the capacity of the existing trunk sewers or the capacity of the downstream treatment plant.
Proposed Lemay Pump Station No. 3 is a wet-pit/dry-pit station with a firm capacity of 15MGD. Lemay No. 3 Pump Station will accept the flows from the Jefferson Barracks Tunnel and pump to the Lemay WWTF. The new Lemay No. 3 PS will replace the existing pump station. The Lemay No. 3 PS will be the network connection point of all the Intake structures and level sensors in the Jefferson Barracks Tunnel system, therefore control and monitoring of the Tunnel will be consolidated at the Lemay No. 3 PS.
The Lower and Middle River Des Peres (LMRDP) CSO Storage Tunnel Dewatering Pump Station (DPS) will receive all the flow entering the LMRDP CSO Storage Tunnel. The DPS peak design flow is 100 MGD and will pump either to the Lemay Wastewater Treatment Plant (WWTP) or the Enhanced High Rate Clarification (EHRC) facility. The DPS will operate only during or after a weather event that requires the use of the storage tunnel. The bar screen will be located upstream of the DPS to prevent large debris from damaging the pumps.
Intelligent Design and Construction Solutions, LLC completed the design for the instrumentation and control of the revised disinfection systems at the Lemay Wastewater Treatment Plant.
The Jefferson Barracks Tunnel will be responsible for conveying sewage to the Lemay Water Treatment Plant (Lemay WTP) as well as storing potential combined sewer overflow (CSO) and storm sewer overflow (SSO) during a wet weather event.
For the St. Louis City Parks project, IDCS designed electrical upgrades at the historic Carondelet Park Boathouse and the Beckett Park comfort station.
IDCS provided design services for I&C and communications for Lemay Pump Station 1 switchgear and VFD replacement which included engineering evaluations, preparation of contract drawings and specifications.
The Maline Creek Local Storage Facility Tunnel (MCT) and Tunnel Dewatering Pump Station (MCTDPS) is designed to relieve the Bissell Point North Interceptor Tunnel during high flows and store 12.5 MGD until the flows recede.
The Lemay Ash Pump Station pumps the runoff from ash drying lagoons back to the main Lemay Water Treatment Plant (WTP), preventing the runoff from flowing into the Mississippi River through Outfall 002.
IDCS was a sub-consultant to Black & Veatch for the Lemay Water Treatment Plant (WTP) Secondary Improvements Project. This project includes the design of process improvements to increase the secondary treatment capacity from 167MGD to 210MGD, in order to meet new consent decree requirements.
The Consent Decree requires increasing influent pumping capacity to the Lemay WWTP to 340mgd by December 31, 2015. The District's preferred alternative for providing additional pumping capacity is to design a second (redundant) force main from Lemay Pump Station No. 1 to the Lemay WWTP.
Lower Meramec WWTP is one of several MSD treatment facilities that have been modified to include disinfection. Lower Meramec's Disinfection included a chemical disinfection process and IDCS was the lead designer for the instrumentation and controls.
Intelligent Design and Construction Solutions, LLC completed the instrumentation and control design for the disinfection system at the Bissell Wastewater Treatment Plant. There are two disinfection systems at Bissell WWTP, both of which utilize a chlorination/dechlorination chemical system.