PURPOSE: The following criteria have been prepared as a guide for the preparation of engineering reports or facility plans and detail plans and specifications. This rule is to be used with rules 10 CSR 20-8.120—10 CSR 20-8.220 for the planning and design of the complete treatment facility. This rule reflects the minimum requirements of the Missouri Clean Water Commission as regards adequacy of design, submission of plans, approval of plans and approval of completed sewage works. Deviation from these minimum requirements will be allowed where sufficient documentation is presented to justify the deviation. These criteria are taken largely from Great Lakes-Upper Mississippi River Board of State Sanitary Engineers Recommended Standards for Sewage Works and are based on the best information presently available. These criteria were originally filed as 10 CSR 20-8.030. It is anticipated that they will be subject to review and revision periodically as additional information and methods appear. Addenda or supplements to this publication will be furnished to consulting engineers and city engineers. If others desire to receive addenda or supplements, please advise the Clean Water Commission so that names can be added to the mailing list.

Editor’s Note: The secretary of state has determined that the publication of this rule in its entirety would be unduly cumbersome or expensive. The entire text of the material referenced has been filed with the secretary of state. This material may be found at the Office of the Secretary of State or at the headquarters of the agency and is available to any interested person at a cost established by state law.

1. (1) Definitions. Definitions as set forth in the Clean Water Law and 10 CSR 20-2.010 shall apply to those terms when used in this rule, unless the context clearly requires otherwise. Where the terms shall and must are used, they are to mean a mandatory requirement insofar as approval by the agency is concerned, unless justification is presented for deviation from the requirements. Other terms, such as should, recommend, preferred and the like, indicate discretionary requirements on the part of the agency and deviations are subject to individual consideration.
2. (2) Exceptions. This rule shall not apply to facilities designed for twenty-two thousand five hundred (22,500) gallons (85.4m3) per day or less (see 10 CSR 20-8.020 for the requirements for those facilities).
3. (3) Engineering services are performed in three (3) steps—engineering report or facilities plan; preparation of construction plans, specifications and contractual documents; and construction compliance, inspection, administration and acceptance. These services are generally performed by engineering firms in private practice but may be executed by municipal, state or federal agencies. All reports, plans and specifications should be submitted at least sixty (60) days prior to the date upon which action by the agency is desired, or in accordance with NPDES or other schedules. The documents, at the appropriate times, should be submitted for formal approval and should include the engineer’s report (facilities plan) and design drawings and specifications. For nongrant projects which are unusual or complex, it is suggested that the engineer meet with the appropriate regional office to discuss the project and that preliminary reports be submitted for review prior to the preparation of final plans and specifications. These documents are used by the owner in programming future action, by the agency to evaluate probable compliance with statutes and regulations, by bond attorneys and investment houses to develop and evaluate financing and by the news media. Preliminary reports and plans shall broadly describe existing problems; consider methods for alternate solutions including site and/or route selection; estimate capital and annual costs; and outline steps for further project implementation, including financing and approval by regulatory agencies. No approval for construction can be issued until final, detailed plans and specifications have been submitted to the agency and found to be satisfactory.

4. (4) Engineering Report or Facility Plan. For construction grant projects the federal regulations describe requirements for the facility plan which must be met. The engineering report, for nongrant projects, assembles basic information; presents design criteria and assumptions; examines alternate projects with preliminary layouts and cost estimates; describes financing methods giving anticipated charges for users; reviews organizational and staffing requirements; offers a conclusion with a proposed project for client consideration; and outlines official actions and procedures to implement the project. The concept, including process description and sizing, factual data and controlling assumptions and considerations for the functional planning of sewerage facilities are presented for each process unit and for the whole system. These data form the continuing technical basis for detail design and preparation of construction plans and specifications. Architectural, structural, mechanical and electrical designs are usually excluded. Sketches may be desirable to aid in presentation of a project. Outline specifications of process units, special equipment, etc., are occasionally included.

   1. (A) Format for Content and Presentation. It is urged that the following paragraphs be utilized as a guideline for content and presentation of the project engineering report to the agency for review and approval.

      1. 1. Title. The wastewater facilities

report—collection, conveyance, processing and discharge of wastewater.

1. 2. Letter of transmittal. A one (1) page

letter typed on the firm’s letterhead and bound into report should include submission of report to the client, statement of feasibility of recommended project, acknowledgment to those giving assistance and reference to project as outgrowth of approved area-wide wastewater management plans.

1. 3. Title page. Title of project; munici-

pality, county or other sponsoring agency; names of officials, managers, superintendents; name and address of firm preparing report; seal and signature of the professional engineer in charge of project.

1. 4. Table of contents. (Number all pages;

cross-reference by page number.) Section heading, chapter heading and sub-headings; maps; graphs; illustrations, exhibits; diagrams; appendices.

1. 5. Summary. Highlight, very briefly,

what was found from the study.

1. A. Findings. Population—present,

design (when), ultimate; land use and zoning—portion per residential, commercial, industrial, greenbelt, etc.; wastewater characteristics and concentrations—portions of total hydraulic, organic and solids loading attributed to residential, commercial and industrial fractions; collection system projects—immediate needs to implement recommended project, deferred needs to complete recommended project and pump stations, force mains, appurtenances, etc.; selected process and site—characteristics of process expected for effluent quality and description of site, environmental assessment of selected process; receiving waters—existing water quality and quantity, classifications and downstream 10 CSR 20-8

water uses and impact of project on receiving water; proposed project—total project costs, total annual expense requirements for debt service; operation, personnel and operation and nonpersonnel; finances—indicate financing requirements and typical annual charges; organization—administrative control necessary to implement project, carry through to completion, operate and maintain wastewater facility and system; and changes—alert client to situations that could alter recommended project.

1. B. Conclusions. Project(s) recom-

mended to client for immediate construction, suggested financing program and other.

1. C. Recommendations. Summarized,

step-by-step actions, for client to follow to implement conclusions—official acceptance of report; adoption of recommended project; submission of report to agency for review and approval; authorization of engineering services for approved project (construction plans, specifications, contract documents, etc.); legal services; enabling ordinances, resolutions, etc., required; adoption of seweruse ordinance; adoption of operating rules; financing program requirements; organization and administration (structure, personnel, employment, etc.); time schedules—implementation, construction, completion dates, reflecting applicable hearings, stipulations, abatement orders.

1. 6. Introduction. Purpose—reasons for

report and circumstances leading up to report; scope—coordination of recommended project with approved comprehensive master plan and guideline for developing the report.

1. 7. Existing conditions and projections.

   1. A. Planning period. Total period of

time for which program is to be studied.

1. B. Land use. Existing area, expan-

sion, annexation, intermunicipal service, ultimate planning area; drainage basin, portion covered; and residential, commercial and industrial land use, zoning, population densities, industrial types and concentrations.

1. C. Demographic and economic data.

Population growth, trends, increase during design of life of facility (graph); assessed valuation, tax structure, tax rates, portions for residential, commercial, industrial property; employment, from within and outside service area; transportation systems, effect on commuter influx, exempt property (schools, colleges, churches, foundations, governmental agencies, etc.) and effect on project; and costs of present water and wastewater services.

1. D. General. Topography, general

geology and effect on project; and meteorology, precipitation, runoff, flooding, etc. and effect on project.

1. E. Forecasts of flow and waste loads.

Water consumption (total, unit, industrial); wastewater flow pattern, peaks, total design flow; physical, chemical and biological characteristics and concentrations; residential, commercial, industrial, infiltration/inflow fractions, considering organic, solids, toxic, aggressive, etc. substances; tabulate each fraction separately and summarize.

1. F. Local regulations. Existing ordi-

nances and rules including defects and deficiencies, etc.; recommended amendments, revisions or cancellation and replacement; sewer-use ordinance (toxic, aggressive, volatile, etc. substances) surcharge based on volumes and concentration for industrial wastewaters; existing contracts and agreements (intermunicipal, etc.); and enforcement provisions including inspection, sampling, detection, penalties, etc.

1. 8. Existing facilities evaluation.

   1. A. Existing collection system. Inven-

tory of existing sewers; isolation from water supply wells; adequacy to meet project needs (structural condition, hydraulic capacity tabulation); gauging and infiltration/inflow analysis; overflows and required maintenance, repairs, improvements and methods for control; outline repair, replacement and stormwater separation requirements; evaluation of costs for treating infiltration/inflow versus cost for rehabilitation of system; establish renovation priorities, if selected; present recommended annual program to renovate sewers; and indicate required annual expenditure.

1. B. Existing treatment plant site. Area

for expansion, terrain, subsurface conditions; isolation from habitation; isolation from water supply structures; enclosures of units, odor control, landscaping, etc.; and flooding (predict elevation of twenty-five (25) and one hundred (100)-year flood stage).

1. C. Existing facilities. Tabulate capac-

ities and adequacy of units (wastewater treatment, sludge processing and sludge disposal); relationship and/or applicability to proposed project; age and condition; adaptability to different usages; structures to be retained, modified or demolished; and outfall.

1. D. Existing wastewater characteris-

tics. Water consumption from records (total, unit, industrial); wastewater flow pattern, peaks, total design flow (verify accuracy of installed metering equipment); physical, chemical and biological characteristics and concentrations; residential, commercial, industrial, infiltration/inflow fractions, considering organic solids, toxic, aggressive, etc. substances; tabulate each fraction separately and summarize.

1. E. Evaluation of unsewered communi-

ties. Types of existing residential systems and their construction of deficiencies, operational problems and number of residents served.

1. 9. Basic project development.

   1. A. Proposed collection system. Inven-

tory of proposed additions, isolation from water supply wells, reservoirs, facilities, etc.; area of service; unusual construction problems; utility interruption and traffic interference; restoration of pavements, lawns, etc.

1. B. Design wastewater characteristics.

Character of wastewater necessary to insure amenability to process selected; need to pretreat industrial wastewater before discharge to sewers; portion of residential, commercial, industrial wastewater fractions to comprise projected growth.

1. C. Receiving water considerations.

Upstream wastewater discharges; receiving water base flow; characteristics (concentrations) of receiving waters; downstream water uses including water supply, recreation, agricultural, industrial, etc.; impact of proposed discharge on receiving waters; tabulation of plant performance versus receiving water requirements; listing of effluent characteristics; and correlation of plant performance versus receiving water requirements. A determination from the Department of Natural Resources, Division of Geology and Land Survey, of whether the receiving stream is losing or gaining shall be included in the engineering report (facility plan).

1. D. Effluent limitations. Allowable

concentration of pollutants in the effluent based on 10 CSR 20-7.015 Effluent Regulations.

1. E. Treatment plant site requirements.

Compare advantages and disadvantages relative to cost, hydraulic requirements, flood control, accessibility, enclosure of units, odor control, landscaping, etc. and isolation with respect to potential nuisances and protection of water supply facilities.

1. F. Alternatives. Consider such items

as regional solutions, optimum operation of existing facilities, flow and waste reduction, location of facilities, phased construction, necessary flexibility and reliability, sludge disposal, alternative treatment sites, alternative collection and treatment processes and institutional arrangements.

1. G. Alternative process and sites.

Describe and delineate (line diagrams); preliminary design for cost estimates; estimates of total project cost (dated, keyed to construction cost index, escalated, etc.); advantages and disadvantages of each; individual differences, requirements, limitations; characteristics of process output; comparison of process performances; environmental assessment of each (including both primary and secondary impacts); operation and maintenance expense and energy requirements; and annual expense requirements (tabulation of annual operation, maintenance, personnel, debt obligation for each alternate).

1. H. Selected process and site. Identify

and justify process and site selected; adaptability to meet initial and future needs; environmental assessment; outfall location; and describe immediate and deferred construction.

1. I. Project financing. Review applica-

ble, financing methods; effect of state and federal assistance; assessment (a combination of methods should most probably be applied to distribute cost and expenses as equitably as possible in relation to benefit received) by valuation, front foot, area unit or other benefit; charges (a combination of methods should most probably be applied to distribute cost and expenses as equitably as possible in relation to benefit received) by connection, occupancy, readiness-to-serve, water consumption, industrial wastewater discharge, etc.; existing debt service requirements; bond retirement schedule; tabulate all expenses; show how representative properties and users are to be affected; and show anticipated typical annual charge to user and nonuser.

1. J. Legal and other considerations.

Needed enabling legislation, ordinances, rules; statutory requirements and limitations, contractual considerations for intermunicipal cooperation; and public information and education.

1. (B) Appendices. Technical Information and Design Criteria.

   1. 1. Collection system. Design tabula-

tion—flow, size, velocities, etc.; regulator or overflow design; pump station calculations including energy requirements; special appurtenances; stream crossings; and system map (report size).

1. 2. Process facilities. Criteria selection

and basis; hydraulic and organic loadings— minimum, average, maximum and effect (wastewater and sludge processes); unit dimensions; rates and velocities; detentions concentrations; recycle; chemical additive control; physical control and flow metering; removals; effluent concentrations, etc. (include a separate tabulation for each unit to handle solid and liquid fractions); energy requirement; and flexibility.

1. 3. Process diagrams. Process configura-

tion, interconnecting piping, processing, flexibility, etc.; hydraulic profile; organic loading profile; solids profile; solids control system; and flow diagram with capacities, etc.

1. 4. Laboratory. Physical and chemical

tests and frequency to control process; time for testing; space and equipment requirements; and personnel requirements—number, type, qualifications, salaries, benefits (tabulate).

1. 5. Operation and maintenance. Routine

special maintenance duties; time requirements; tools, spare parts, equipment, vehicles, safety, etc.; maintenance workspace and storage; and personnel requirements—number, type, qualifications, training, salaries, benefits (tabulate).

1. 6. Office space for administrative per-

sonnel and records.

1. 7. Personnel services. Locker rooms

and lunch rooms.

1. 8. Chemical control. Processes needing

chemical addition; chemicals and feed equipment; tabulation of amounts and unit and total costs.

1. 9. Collection systems control. Cleaning

and maintenance; regulator and overflow inspection and repair; flow gauging; industrial sampling and surveillance; ordinance enforcement; equipment requirements; trouble-call investigation; and personnel requirements—number, type, qualifications, salaries, benefits, training (tabulate).

1. 10. Control summary. Personnel; equip-

ment; chemicals, utilities, list power requirements of major units; and summation.

1. 11. Support data. Outline unusual spec-

ifications, construction materials and construction methods; maps, photographs, diagrams; and other.

1. (5) Preliminary Design Review. On all grant projects the consulting engineer shall submit the project for review at approximately a twenty percent (20%) design stage. The design information to be submitted shall include a layout of the study area delineating all proposed improvements, including subareas, with contributing flows and design populations. All calculations regarding sizing of lift stations and treatment plan units shall also be included. A conference between the consultant and the review engineer may be arranged to discuss the project.

2. (6) Plans.

   1. (A) General. All plans for sewage works shall bear a suitable title showing the name of the municipality, sewer district or institution; and shall show the scale in feet, a graphical scale, the north point, data and the name of the engineer, certificate number and imprint of his/her registration seal. A space should be provided for signature and/or approval stamp of the appropriate reviewing and approving officials and/or agencies. The plans shall be clear and legible (suitable for microfilming). They shall be drawn to a scale which will permit all necessary information to be plainly shown. The size of the plans generally should not be larger than thirty by forty-two inches (30" × 42") (76 cm × 107 cm). Datum used should be indicated. Locations and logs of test borings, when made, shall be shown on the plans. Blueprints shall not be submitted. Detail plans shall consist of plan views, elevations, sections and supplementary views which, together with the specifications and general layouts, provide the working information for the contract and construction of the works. Include dimensions and relative elevations of structures, the location and outline form of equipment, location and size of piping, water levels and ground elevations.

   2. (B) Plans of Sewers.

      1. 1. General plan. A comprehensive plan

of the existing and proposed sewers shall be submitted for projects involving new sewer systems and substantial additions to existing systems. This plan shall show the following:

1. A. Geographical features. Existing or

proposed streets and all streams or water surfaces shall be clearly shown. Contour lines at suitable intervals should be included. The direction of flow in all streams and high and low water elevations of all water surfaces at sewer outlets and overflows shall be shown. The boundary lines of the municipality and the sewer district or area to be sewered shall be shown.

1. B. Sewers. The plan shall show the

location, size and direction of flow of all existing and proposed sanitary and combined sewers draining to the treatment works concerned.

1. 2. Detail plans. Detail plans shall be

submitted. Profiles should have a horizontal scale of not more than one hundred feet (100') to the inch (12 m to the cm) and a vertical scale of not more than ten feet (10') to the inch (12 dm to the cm). Plan view should be drawn to a corresponding horizontal scale. Plans and profiles shall show—

1. A. Location of streets and sewers;
2. B. Line of ground surface, pipe size,

length between manholes, invert and surface elevation at each manhole, grade of sewer between each two (2) adjacent manholes and pipe material and type where special construction features are required. All manholes shall be numbered on the plan and correspondingly numbered on the profile. Where there is any question of the sewer being sufficiently deep to serve any residence, the elevation and location of the basement floor shall be plotted on the profile of the sewer which is to serve the house in question. The engineer shall state that all sewers are sufficiently deep to serve adjacent basements except where otherwise noted on the plans; 10 CSR 20-8

1. C. Locations of all special features

such as inverted siphons, concrete encasements, elevated sewers, etc.;

1. D. All known existing structures and

utilities both above and below ground which might interfere with the proposed construction, particularly water mains, gas mains and storm drains; and

1. E. Special detail drawings, made to a

scale to clearly show the nature of the design and the following particulars: all stream crossings and sewer outlets, with elevations of the stream bed and of normal and extreme high and low water levels; details of all special sewer joints and cross sections; details of all sewer appurtenances such as manholes, lampholes, inspection chambers, inverted siphons, regulators, tide gates and elevated sewers.

1. (C) Plans of Sewage Pumping Stations.

   1. 1. Location plan. A plan shall be sub-

mitted for projects involving construction or revision of pumping stations. This plan shall show the following: the location and extent of the tributary area; any municipal boundaries with the tributary area; the location of the pumping station and force main; and pertinent elevations.

1. 2. Detail plans. Detail plans shall be

submitted showing the following, where applicable:

1. A. Topography of the site;
2. B. Existing pumping station;
3. C. Proposed pumping station, includ-

ing provisions for installation of future pumps or ejectors;

1. D. Elevation of high water at the site

and maximum elevation of sewage in the collection system upon occasion of power failure;

1. E. Maximum hydraulic gradient in

downstream gravity sewers when all installed pumps are in operation; and

1. F. Test boring and groundwater eleva-

tions.

1. (D) Plans of Sewage Treatment Plants.

   1. 1. Location plan. A plan shall be sub-

mitted showing the sewage treatment plant in relation to the remainder of the system. Sufficient topographic features shall be included to indicate its location with relation to streams and the point of discharge of treated effluent.

1. 2. General layout. Layouts of the pro-

posed sewage treatment plant shall be submitted showing topography of the site; size and location of plant structures; schematic flow diagram showing the flow through various plant units and for the various utility systems serving the plant processes; piping, including any arrangement for bypassing individual units; materials handled and direction of flow through pipes; hydraulic profiles showing the flow of sewage, supernatant liquid and sludge; test borings; and groundwater elevations shall be provided.

1. 3. Detail plans. Detail plans shall show

the following, unless otherwise covered by the specifications or engineer’s reports— location, dimensions and elevations of all existing and proposed plant facilities; elevation of high and low water level of the body of water to which the plant effluent is to be discharged; type, size, pertinent features and operating capacity of all pumps, blowers, motors and other mechanical devices; minimum, average and maximum hydraulic flow in profile; and adequate description of any other features pertinent to the design.

1. (7) Specifications. Complete technical specifications for the construction of sewers, sewage pumping stations, sewage treatment plants and all appurtenances shall accompany the plans. The specifications accompanying construction drawings shall include, but not be limited to, all construction information not shown on the drawings which is necessary to inform the builder in detail of the design requirements as to the quality of materials and workmanship and fabrication of the project and the type, size, strength, operating characteristics and rating of equipment; allowable infiltration; the complete requirements for all mechanical and electrical equipment, including machinery, valves, piping and jointing of pipe; electrical apparatus, wiring, instrumentation and meters; laboratory fixtures and equipment; operating tools; construction materials; special filter materials such as stone, sand, gravel or slag; miscellaneous appurtenances; chemicals when used; instructions for testing materials and equipment as necessary to meet design standards; and performance tests for the completed works and component units. It is suggested that these performance tests be conducted at design load conditions wherever practical.
2. (8) Revisions to Approved Plans. Any deviations from approved plans or specifications affecting capacity, flow, operation of units or point of discharge shall be approved in writing before such changes are made. Plans or specifications so revised should be submitted therefore, well in advance of any construction work which will be affected by the changes, to permit sufficient time for review and approval. Structural revisions or other minor changes not affecting capacities, flows or operation will be permitted during construction without approval. As-built plans clearly showing the alterations shall be submitted to the agency at the completion of the work.
3. (9) Operation During Construction. Specifications shall contain a program for keeping existing treatment plant units in operation during construction of plant additions. Should it be necessary to take plant units out of operation, a shutdown schedule which will minimize pollutional effects on the receiving stream shall be reviewed and approved in advance by the agency and shall be adhered to.

AUTHORITY: section 644.026, RSMo 1986.* Original rule filed Aug. 10, 1978, effective March 11, 1979. *Original authority 1972, amended 1973, 1987, 1993.