Facility Plan Guidance for Wastewater Treatment Facilities

Water Protection Program fact sheet
07/2019
Division of Environmental Quality Director: Ed Galbraith
PUB2416

This document provides engineering consultants a comprehensive guide of the Missouri Department of Natural Resources’ recommendations and requirements for an approvable facility plan for facilities not receiving funding from the department.

Projects receiving funding from the department under 10 CSR 20-4 require additional information in the facility plan. More information concerning department funding and requirements visit dnr..mo.gov/env/wpp/srf/index.html.

Water Quality Review and Anti-degradation evaluation or determination must be completed prior to submitting a facility plan for all new and expanding facilities. See 10 CSR 20-8.110(4) and 10 CSR 20-6.010(4).

Facility plans are exempt for the following non-funded projects:

The facility plan must include sufficient detail to demonstrate the proposed project meets applicable criteria. The data presented in the facility plan is the basis for the detailed design of the construction plans and specifications.

Facility plans must be approved by the department prior to the submittal of plans and specifications, construction permit application and associated fee(s). See 10 CSR 20-8.110(2)(A).

The following is a sample format for the required facility plan content:

Cover Page
Include the following:

Problem Defined
Provide an introduction describing the problem or situation the project will address. Include the following:

Hydraulic Capacity and Organic Waste Load
For consistency, use the following flow definitions.

Peaking Factor = Q Peak Hourly / Q Design Avg = (18 + √P) / (4 + √P)

Where:

Q Peak Hourly = design peak hourly flow
Q Design Avg = design average flow
P = Population in thousands

Re-rating the Design Flow
Evaluate the hydraulic and organic waste load using the last five years of representative data, consider the size of each unit process, and anticipated growth. See 10 CSR 20-8.110(3) for more details.

Planning and Service Area
Provide a map or sketch that includes: Population Projection and Planning Period

Existing Facilities Evaluation
Include the following:

Project Alternative Analysis

Communities not proposing to employ a full-time operator, 40-hours per week, should evaluate passive or easy-to-operate treatment alternatives before considering a mechanical activated sludge package plant. Examples of passive or easy-to-operate treatment systems include, but are not limited to, enhanced natural systems, submerged fixed film systems and recirculating media filters.