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NEPA Details


Categorical Exclusion For the DC-02 & DC-03 Sanitary Relief (Brentwood Blvd to Conway Rd) Phase III/IV and the Deer Creek Sanitary Tunnel Pump Station

Document Number


Document Type


Project Description

The DC-02 & DC-03 Sanitary Relief (Brentwood Blvd. to Conway Rd.) Phase III/IV project will relieve surcharging in the existing 21-inch to 27-inch sanitary sewer trunk lines and eliminate five constructed sanitary sewer overflows (SSOs) within the Deer Creek Watershed. The project is located within the City of Ladue in St. Louis County, MO. The constructed SSOs within the project area are identified in MSD's Consent Decree as requiring elimination by December 31, 2023. The project includes construction of approximately 16,900 feet of 8-inch to 54-inch sanitary sewer, slip-lining 1,700 feet of sanitary sewer, and associated appurtenances. The Deer Creek Sanitary Tunnel Pump Station project will function to drain the Deer Creek Sanitary Tunnel which will provide storage for excessive inflow and infiltration during wet weather events causing surcharging in existing sewers and activating constructed SSOs within the Deer Creek watershed. The Deer Creek Sanitary Tunnel Pump Station will be constructed at the downstream end of the Deer Creek Sanitary Tunnel storage facility. The pump station project construction will include the installation of one (1) wet well and two (2) dry wells constructed in existing shafts excavated as part of the Deer Creek Sanitary Tunnel project. Additionally, one (1) wet well building, one (1) dry well building, one (1) effluent structure box and site improvements are included in the pump station construction.

EPA Region/Headquarters Office


State or Territory


Point of Contact

Alejandro Escobar

Date of Issuance



NEPA Document(s):

MSD Categorical Exclusion 053018_signed.pdf (6 pp, 217 K)