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 through 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 in regard to adequacy of design, submission of plans, approval of plans, and approval of completed wastewater treatment facilities. It is not reasonable or practical to include all aspects of design in these standards. The design engineer should obtain appropriate reference materials which include but are not limited to: copies of all ASTM International standards, design manuals such as Water Environment Federation’s Manuals of Practice (MOPs), and other sewer and wastewater treatment design manuals containing principles of accepted engineering practice. Deviation from these minimum requirements will be allowed where sufficient documentation is presented to justify the deviation. These criteria are taken largely from the 2004 edition of the Great Lakes-Upper Mississippi River Board of State and Provincial Public Health and Environmental Managers Recommended Standards for Wastewater Facilities 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.

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 Missouri Department of Natural Resources (department) is concerned, unless justification is presented for deviation from the requirements. Other terms, such as “should,” “recommend,” “preferred,” and the like, indicate the preference of the department for consideration by the design engineer.

   1. (A) Deviations. Deviations from these rules may be approved by the department when engineering justification satisfactory to the department is provided. Justification must substantially demonstrate in writing and through calculations that a variation(s) from the design rules will result in either at least equivalent or improved effectiveness. Deviations are subject to case-by-case review with individual project consideration.
2. (2) Applicability. This rule shall apply to all facilities with a design flow of one hundred thousand (100,000) gallons (378.5 m3) per day or greater. This rule shall also apply to all facilities with a design flow of twenty-two thousand five hundred (22,500) gallons (85.2 m3) per day or greater until such time as 10 CSR 20-8.020 is amended.

3. (3) General.

   1. (A) Engineering Services. Engineering services are performed in three (3) steps—

      1. 1. Engineering report or facility plan;
      2. 2. Preparation of construction plans and

specifications; and

1. 3. Contractual documents, construction

compliance, inspection, administration, and acceptance.

1. (B) 10 CSR 20-8.110 Engineering— Reports, Plans, and Specifications covers the items in paragraphs (3)(A)1. and 2. above.
2. (C) All reports, plans, and specifications must be submitted at least one hundred eighty

1. (180) calendar days prior to the date upon which action by the department is desired, or in accordance with a National Pollutant Discharge Elimination System (NPDES) permit or other departmental schedules. The documents, at the appropriate times, must be submitted for formal approval and should include the engineer’s report or facility plan, design drawings, and specifications. Engineering reports or facility plans must be approved by the department prior to the submittal of the design drawings, specifications, and the appropriate permit applications and fees. For projects involving both collection systems and wastewater treatment facilities, the information required in subsection (4)(B) must be included in the facility plan. These documents are used by the owner in programming future action, by the department to evaluate probable compliance with statutes and regulations, and by bond attorneys and investment houses to develop and evaluate financing. Engineering reports and facility plans should 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 the department and other agencies. No approval for construction can be issued until final detailed plans and specifications with the design engineer’s imprint of his/her registration seal with the date and engineer’s signature affixed have been submitted and found to be satisfactory by the department.

   1. (D) Engineering reports and facility plans shall include a statement identifying the continuing authority, a contact person for the authority, and the continuing authority phone number and address, along with the design engineer’s imprint of his/her registration seal with the date and engineer’s signature affixed to the document.

2. (4) Engineering Report or Facility Plan.

   1. (A) General.

      1. 1. The engineering report or facility plan

identifies and evaluates wastewater related problems; assembles basic information; presents criteria and assumptions; examines alternate projects, with preliminary layouts and cost estimates; describes financing methods; sets forth 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 planning document must include sufficient detail to demonstrate that the proposed project meets applicable criteria.

1. 2. The overall plan, including process

description and sizing, factual data, and controlling assumptions and considerations for the functional planning of wastewater facilities, is presented for each process unit and for the whole system. These data form the continuing technical basis for the detailed design and preparation of construction plans and specifications.

1. 3. 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. 4. Engineering reports must be complet-

ed for projects involving gravity sewers, pressure sewer systems, wastewater pumping stations, and force mains. Facility plans must be completed for projects involving wastewater treatment facility projects and projects receiving funding through the grant and loan programs under 10 CSR 20-4.

1. A. Unless required by the depart-

ment, an engineering report will not have to be submitted for projects limited to only eight-inch (8") (20 cm) gravity sewer extensions.

1. (B) Engineering Reports. Engineering reports shall contain the following information and other pertinent information as required by the department: 10 CSR 20-8

   1. 1. Problem defined. Description of the

existing system must include an evaluation of the conditions and problems needing correction;

1. 2. Flow loads. The existing and design

average and peak flows and waste load must be established. The basis of the projection of initial and future flows and waste load must be included and must reflect the existing, or initial service area, and the anticipated future service area. Flow loading information and data needed for new facilities are included in paragraph (4)(C)4. of this rule;

1. 3. Impact on existing wastewater facili-

ties. The impact of the proposed project on all existing wastewater facilities, including gravity sewers, pump stations, and treatment facilities, must be evaluated. Refer to 10 CSR 20-8.120 and 10 CSR 20-8.130;

1. 4. Project description. A written descrip-

tion of the project is required;

1. 5. Drawings. Drawings or sketches iden-

tifying the site of the project and anticipated location and alignment of proposed facilities are required;

1. 6. Technical information and design cri-

teria. All technical and design information used to design the collection system(s), pump station(s), etc., must be provided either in the engineering report or in the summary of design and shall include, at a minimum, design tabulation flow, size, and velocities; all pump station calculations including energy requirements; special appurtenances; stream crossings; and system map (report size). Outline unusual specifications, construction materials, and construction methods; maps, photographs, and diagrams; and other supporting data needed to describe the system. If an engineering report is not required, this information must be included in the summary of design. Refer to 10 CSR 20-8.110(5);

1. 7. Site information. Project site informa-

tion should include topography, soils, geologic conditions, depth to bedrock, groundwater level, floodway or floodplain considerations, distance to water supply structures, roads, residences, and other pertinent site information; and

1. 8. It is preferred that any request for a

deviation from 10 CSR 20-8 be addressed along with the engineering justifications in the engineering report. Otherwise, all requests for deviations from 10 CSR 20-8.120 and 10 CSR 20-8.130 must accompany the plans and specifications.

1. (C) Facility Plans. Facility plans shall contain the following and other pertinent information as required by the department:

   1. 1. Problem evaluation and existing facil-

ity review—

1. A. Descriptions of existing system,

including condition and evaluation of problems needing correction; and

1. B. Summary of existing and previous

local and regional wastewater facility and related planning documents, if applicable;

1. 2. Planning and service area. Drawings

identifying the planning area, the existing and potential future service area, the site of the project, and anticipated location and alignment of proposed facilities are required;

1. 3. Population projection and planning

period. Present and predicted population shall be based on a twenty (20)-year planning period. Phased construction of wastewater facilities shall be considered in rapid growth areas. Sewers and other facilities with a design life in excess of twenty (20) years shall be designed for the extended period;

1. 4. Hydraulic capacity.

   1. A. Flow definitions and identifica-

tion. The following flows for the design year shall be identified and used as a basis for design for sewers, pump stations, wastewater treatment facilities, treatment units, and other wastewater handling facilities. Where any of the terms defined in this section are used in these design standards, the definition contained in this section applies.

1. (I) Design average flow—The

design average flow is the average of the daily volumes to be received for a continuous twelve (12)-month period expressed as a volume per unit time. However, the design average flow for facilities having critical seasonal high hydraulic loading periods (e.g., recreational areas, campuses, and industrial facilities) shall be based on the daily average flow during the seasonal period.

1. (II) Design maximum daily flow—

The design maximum daily flow is the largest volume of flow to be received during a continuous twenty-four (24)-hour period expressed as a volume per unit time.

1. (III) Design peak hourly flow—The

design peak hourly flow is the largest volume of flow to be received during a one (1)-hour period expressed as a volume per unit time.

1. (IV) Design peak instantaneous

flow—The design peak instantaneous flow is the instantaneous maximum flow rate to be received.

1. B. Hydraulic capacity for existing col-

lection and treatment systems.

1. (I) Projections shall be made from

actual flow data to the extent possible.

1. (II) The probable degree of accura-

cy of data and projections shall be evaluated. This reliability estimation shall include an evaluation of the accuracy of existing data, based on no less than one (1) year of data, as well as an evaluation of the reliability of estimates of flow reduction anticipated due to infiltration/inflow (I/I) reduction or flow increases due to elimination of sewer overflows and backups.

1. (III) Critical data and methodology

used shall be included. Graphical displays of critical peak wet weather flow data (refer to parts (4)(C)4.A.(II), (III), and (IV) of this rule) shall be included for a sustained wet weather flow period of significance to the project.

1. C. Hydraulic capacity for new collec-

tion and treatment systems.

1. (I) The sizing of wastewater facili-

ties receiving flows from new wastewater collection systems shall be based on an average daily flow of one hundred (100) gallons (0.38 m3) per capita per day plus wastewater flow from industrial facilities and major institutional and commercial facilities unless water use data or other justification upon which to better estimate flow is provided.

1. (II) The one hundred (100) gallons

(0.38 m3) per capita per day figure shall be used, which, in conjunction with a peaking factor from the following Figure 1, included herein, is intended to cover normal infiltration for systems built with modern construction techniques. Refer to 10 CSR 20-8.120.

1. (III) If the new collection system is

to serve existing development, the likelihood of infiltration/inflow (I/I) contributions from existing service lines and non-wastewater connections to those service lines shall be evaluated and wastewater facilities designed accordingly.

1. D. Combined sewer interceptors. In

addition to the above requirements, interceptors for combined sewers shall have capacity to receive sufficient quantity of combined wastewater for transport to treatment facilities to ensure attainment of the appropriate water quality standards;

1. 5. Organic capacity.

   1. A. Organic load definitions and iden-

tification. The following organic loads for the design year shall be identified and used as a basis for design of wastewater treatment facilities. Where any of the terms defined in this section are used in these design standards, the definition contained in this section applies.

1. (I) Biochemical Oxygen Demand—

The five (5)-day Biochemical Oxygen Demand (BOD5) is defined as the amount of oxygen required to stabilize biodegradable organic matter under aerobic conditions within a five (5)-day period.

1. (a) Total five (5)-day Biochemi-

cal Oxygen Demand (TBOD5) is equivalent to BOD5 and is sometimes used in order to differentiate carbonaceous plus nitrogenous oxygen demand from strictly carbonaceous oxygen demand.

1. (b) The carbonaceous five (5)-

day Biochemical Oxygen Demand (CBOD5) is defined as BOD5 less the nitrogenous oxygen demand of the wastewater.

1. (II) Design average BOD5—The

design average BOD5 is generally the average of the organic load received for a continuous twelve (12)-month period for the design year expressed as weight per day. However, the design average BOD5 for facilities having critical seasonal high loading periods (e.g., recreational areas, campuses, and industrial facilities) shall be based on the daily average BOD5 during the seasonal period.

1. (III) Design maximum day BOD5—

The design maximum day BOD5 is the largest amount of organic load to be received during a continuous twenty-four (24)-hour period expressed as weight per day.

1. (IV) Design peak hourly BOD5—

The design peak hourly BOD5 is the largest amount of organic load to be received during a one (1)-hour period expressed as weight per day.

1. B. Design of organic capacity of

wastewater treatment facilities to serve existing collection systems.

1. (I) Projections shall be made from

actual wasteload data to the extent possible.

1. (II) Projections shall be compared

to subparagraph (4)(C)5.C. of this rule and an accounting made for significant variations from those values.

1. (III) Impact of industrial sources

shall be documented.

1. C. Organic capacity of wastewater

treatment facilities to serve new collection systems.

1. (I) Domestic wastewater treatment

design shall be on the basis of at least 0.17 pounds (0.08 kg) of BOD5 per capita per day and 0.20 pounds (0.09 kg) of suspended solids per capita per day, unless information is submitted to justify alternate designs.

1. (II) Impact of industrial sources

shall be documented.

1. (III) Data from similar municipali-

ties may be utilized in the case of new systems. However, thorough investigation that is adequately documented shall be provided to the department to establish the reliability and applicability of such data;

1. 6. Wastewater treatment facility design

capacity. The wastewater treatment facility design capacity is the design average flow at the design average BOD5. Refer to paragraphs (4)(C)4. and (4)(C)5. of this rule for peaking factors that will be required.

1. A. Engineering criteria. Engineering

criteria and assumptions used in the design of the project shall be provided in the facility plan. Refer to subsection (4)(D) of this rule for additional information.

1. B. If the project includes the land

application of wastewater, the requirements in 10 CSR 20-8.220 must be included with the facility plan;

1. 7. Initial alternative development. For

projects receiving funding through the grant and loan programs in 10 CSR 20-4, the process of selection of wastewater treatment and collection system alternatives for detailed evaluation shall be discussed. All wastewater management alternatives considered and the basis for the engineering judgment for selection of the alternatives chosen for detailed evaluation shall be included;

1. 8. Detailed alternative evaluation. The

following shall be included for the alternatives to be evaluated in detail.

1. A. Sewer system revisions. Proposed

revisions to the existing sewer system including adequacy of portions not being changed by the project.

1. B. Wet weather flows. Facilities to

transport and treat wet weather flows in a manner that complies with state and local regulations must be provided. The design of wastewater treatment facilities and sewers shall provide for transportation and treatment of all flows including wet weather flows unless the owner’s National Pollutant Discharge Elimination System (NPDES) permit authorizes a bypass.

1. C. Site evaluation. When a site must

be used which is critical with respect to these items, appropriate measures shall be taken to minimize adverse impacts.

1. (I) Compatibility of the treatment

process with the present and planned future land use, including noise, potential odors, air quality, and anticipated sludge processing and disposal techniques, shall be considered. Non-aerated lagoons should not be used if excessive sulfate is present in the wastewater. Wastewater treatment facilities should be separate from habitation or any area likely to be built up within a reasonable future period and shall be separated in accordance with state and local requirements.

1. (II) Zoning and other land use

restrictions shall be identified.

1. (III) An evaluation of the accessi-

bility and topography of the site shall be submitted.

1. (IV) Area for future plant expan-

sion shall be identified.

1. (V) Direction of prevailing wind

shall be identified.

1. (VI) Flood considerations, includ-

ing the twenty-five (25)-year and one hundred (100)-year flood levels, impact on floodplain and floodway, and compliance with applicable regulations in 10 CSR 20-8 regarding construction in flood-prone areas, shall be evaluated.

1. (VII) Geologic information, depth

to bedrock, karst features, or other geologic considerations of significance to the project shall be included. A copy of a geological site evaluation from the department’s Division of Geology and Land Survey providing stream determinations (gaining or losing) must be included for all new wastewater treatment facilities. A copy of a geological site evaluation providing site collapse and overall potentials from the department’s Division of Geology and Land Survey must be included for all earthen basin structures. Earthen basin structures shall not be located in areas receiving a severe overall geological collapse potential rating. (VIII) Protection of groundwater including public and private wells is of utmost importance. Demonstration that protection will be provided must be included. If the proposed wastewater facilities will be near a water source or other water facility, as determined by the department’s Division of Geology and Land Survey or by the department’s Public Drinking Water Branch addressing the allowable distance between these wastewater facilities and the water source must be included with the facility plan. Refer to 10 CSR 20-8.130 and 10 CSR 20-8.140.

1. (IX) Soil type and suitability for

construction and depth to normal and seasonal high groundwater shall be determined.

1. (X) The location, depth, and dis-

charge point of any field tile in the immediate area of the proposed site shall be identified.

1. (XI) Present and known future

effluent quality and monitoring requirements determined by the department shall be included. Refer to subparagraph (4)(C)8.N. of this rule.

1. (XII) Access to receiving stream

for the outfall line shall be discussed and displayed. (XIII) A preliminary assessment of site availability shall be included.

1. D. Unit sizing. Unit operation and

preliminary unit process sizing and basis shall be discussed.

1. E. Flow diagram. A preliminary flow

diagram of treatment facilities including all recycle flows shall be provided.

1. F. Emergency operation. Emergency

operation requirements as outlined in 10 CSR 20-8.130 and 10 CSR 20-8.140 shall be discussed and provided.

1. G. The no-discharge option must be

examined and included as an alternative in the facility plan.

1. H. Technology not included in these

standards. 10 CSR 20-8.140 outlines procedures for introducing and obtaining approval to use technology not included in these standards. Proposals to use technology not included in these standards must address the requirements of 10 CSR 20-8.140.

1. I. Biosolids. The solids disposal

options considered and method selected must be included. This is critical to completion of a successful project. Compliance with requirements of 10 CSR 20-8.170 and any conditions in the owner’s National Pollutant Discharge Elimination System (NPDES) permit must be assured.

1. J. Treatment during construction. A

plan for the method and level of treatment to be achieved during construction shall be developed and included in the facility plan that must be submitted to the department for review and approval. This approved treatment plan must be implemented by inclusion in the plans and specifications to be bid for the project. Refer to paragraph (6)(A)5. and subsection (7)(D) of this rule.

1. K. Operation and maintenance. Por-

tions of the project which involve complex operation or maintenance requirements shall be identified, including laboratory requirements for operation, industrial sampling, and self monitoring.

1. L. Cost estimates. Cost estimates for

capital and operation and maintenance (including basis) must be included for projects receiving funding through the grant and loan programs in 10 CSR 20-4.

1. M. Environmental review.

   1. (I) Compliance with planning

requirements of local government agencies must be documented.

1. (II) Any additional environmental

information meeting the criteria in 10 CSR 20-4.050, for projects receiving funding through the state grant and loan programs.

1. N. Water quality reports. Include all

reviews, studies, or reports required by 10 CSR 20-7, Water Quality, and approved by the department. Any information or sections in an approved study or report required by 10 CSR 20-7 that addresses the requirements in subsection (4)(C) of this rule can be incorporated into the facility plan in place of these sections;

1. 9. Final project selection. The project

selected from the alternatives considered under paragraph (4)(C)10. of this rule shall be set forth in the final facility plan document to be forwarded to the department for review and approval, including the financing considerations and recommendations for implementation of the plan; and

1. 10. It is preferred that any request for a

deviation from 10 CSR 20-8 be addressed along with the engineering justifications in the facility plan. Otherwise, all requests for deviations along with the engineering justification from 10 CSR 20-8.120 through 10 CSR 20-8.220 must accompany the plans and specifications.

1. (D) Appendices. Technical Information and Design Criteria. Due to the complexity of wastewater facilities or funding issues, the following information shall be included upon the request of the department. All system design information can be submitted as, and for all review purposes will be considered, preliminary design data.

   1. 1. 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 10 CSR 20-8

requirement; and flexibility.

1. 2. Process diagrams. Process configura-

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

1. 3. 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), and a brief description of the laboratory facility. See 10 CSR 20-8.140.

1. 4. Operation and maintenance. Routine

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

1. 5. Chemical control. Processes needing

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

1. 6. 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. 7. Control summary. Personnel; equip-

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

1. (5) Summary of Design. A summary of design shall accompany the plans and specifications and shall include the following:

   1. (A) Flow and waste projections including design and peak hydraulic and organic loadings shall be provided for sewers, pump stations, and wastewater treatment facilities. Information shall be submitted to verify adequate downstream capacity of sewers, pump stations, and wastewater treatment and sludge handling unit(s);
   2. (B) Type and size of individual process units including unit dimensions; rates and velocities; detention times; concentrations; recycle; chemical additive control; physical control, flexibility, and flow metering;
   3. (C) Show process diagrams, including flow diagrams with capacities;
   4. (D) Expected removal rates and concentrations of permitted effluent parameters in the discharge from the wastewater treatment facility, including a separate tabulation for each unit to handle solid and liquid fractions;
   5. (E) Design calculations, tabulations, assumptions, and deviations from 10 CSR 20- 8.120 through 10 CSR 20-8.220 used in the design of the system(s);
   6. (F) Include unusual specifications, construction materials, and construction methods; maps, photographs, diagrams; and other support data needed to describe the system; and
   7. (G) Unless required in 10 CSR 20-8.120 through 10 CSR 20-8.220, specific design calculations for the architectural, structural, and mechanical components of a system do not have to be included with the design criteria.

2. (6) Plans.

   1. (A) General.

      1. 1. One (1) set of drawings shall be sub-

mitted to the department for review. In addition to the set of drawings, an electronic version of the plans can be submitted to assist in the review. Additional sets of drawings may be required by the department for final approval.

1. 2. Plan title. All plans for wastewater

facilities 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, date, and the name of the engineer, certificate number, and imprint of his/her registration seal with the engineer’s signature.

1. 3. Plan format. The plans shall be clear

and legible (suitable for microfilming or scanning). They shall be drawn to scale, which will permit all necessary information to be plainly shown for review and suitable for the contracting and construction of the facilities.

1. A. To allow for microfilming or scan-

ning, plans must not be smaller than twentyfour inches by thirty-six inches (24" × 36") (61 cm x 91 cm) or larger than thirty-six inches by forty-eight inches (36" × 48") (91.4 cm × 122 cm). Datum used shall be indicated. Locations and logs of test borings, when required, shall be shown on the plans. Test boring logs must be included on the plans or in the specifications as an appendix. Blueprints shall not be submitted.

1. 4. Plan contents. Detail plans shall con-

sist 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 facilities. They shall also include dimensions and relative elevations of structures, the location and outline form of equipment, location and size of piping, water levels, and ground elevations.

1. 5. Operation during construction. Pro-

ject construction documents shall specify the procedure for operation during construction that complies with the plan required by subparagraph (4)(C)8.J. and subsection (7)(D) of this rule.

1. (B) Plans of Sewers.

   1. 1. General plan. A plan of 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.

   1. (I) Topography and elevations.

Existing or proposed streets and all streams or water surfaces shall be clearly shown. Contour lines at suitable intervals should be included.

1. (II) Streams. The direction of flow

in all streams and high and low water elevations of all water surfaces and overflows shall be shown.

1. (III) Boundaries. The boundary

lines of the municipality or the sewer district and the area to be sewered shall be shown; and

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 facility concerned.

1. 2. Detail plans. Detail plans shall be

submitted. Profiles shall 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 (1.2 m to the cm). Plan views should be drawn to a corresponding horizontal scale and must be shown on the same sheet. 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, pipe material and type, and where special construction features are required. All manholes shall be numbered on the plan and correspondingly numbered on the profile;

1. C. 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;

1. D. Locations of all special features

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

1. E. All known existing structures and

utilities both above and below ground, which might interfere with the proposed construction or require isolation setback, particularly water mains and water supply structures (i.e., wells, clear wells, basins, etc.), gas mains, storm drains, and telephone, cable, and power conduits; and

1. F. Special detail drawings, made to a

scale to clearly show the nature of the design, shall be furnished to show the following particulars:

1. (I) All stream crossings with eleva-

tions of the stream bed and high, normal, and low water levels; and

1. (II) 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 Wastewater 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;

1. D. Elevation of high water at the site

and maximum elevation of wastewater 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 Wastewater Treatment Plants.

   1. 1. Location plan.

      1. A. A plan shall be submitted showing

the wastewater treatment plant in relation to the remainder of the system.

1. B. 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 wastewater treatment plant shall be submitted showing—

1. A. Topography of the site;
2. B. Size and location of plant struc-

tures;

1. C. Schematic flow diagram(s) show-

ing the flow through various plant units and showing utility systems serving the plant processes;

1. D. Piping, including any arrangement

for bypassing individual units; materials handled and direction of flow through pipes shall be shown;

1. E. Hydraulic profiles showing the

flow of wastewater, supernatant liquor, and sludge; and

1. F. Test borings and groundwater ele-

vations shall be provided.

1. 3. Detail plans. Detail plans shall show

the following, unless otherwise covered by the specifications or facility plan:

1. A. Location, dimensions, and eleva-

tions of all existing and proposed plant facilities;

1. B. Elevations of high and low water

level of the body of water to which the plant effluent is to be discharged;

1. C. Type, size, pertinent features, and

operating capacity of all pumps, blowers, motors, and other mechanical devices;

1. D. Minimum, design average, and

peak hourly hydraulic flow in profile; and

1. E. Adequate description of any other

features pertinent to the design.

1. (7) Specifications.

   1. (A) Complete signed, sealed, and dated technical specifications shall be submitted for the construction of sewers, wastewater pumping stations, wastewater treatment plants, and all other appurtenances. Technical specifications shall accompany the plans.
   2. (B) 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 for the quality of materials, workmanship, and fabrication of the project.
   3. (C) The specifications shall also include: 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 facilities and component units. It is suggested that these performance tests be conducted at design load conditions wherever practical.
   4. (D) Operation During Construction. Specifications shall contain a program for keeping existing wastewater treatment plant units in operation during construction of plant additions. Should it be necessary to take plant units out of operation, specifications shall include detailed construction requirements and schedules to avoid unacceptable temporary water quality degradation in accordance with subparagraph (4)(C)8.J. and paragraph (5)(A)5. of this rule.
2. (8) Revisions to Approved Plans. Any deviations from approved plans or specifications affecting capacity, flow, system layout, operation of units, or point of discharge shall be approved by the department in writing before such changes are made. Plans or specifications so revised should, therefore, be submitted well in advance of any construction work which will be affected by such 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 department at the completion of the work.

AUTHORITY: section 644.026, RSMo 2000.* Original rule filed Aug. 10, 1978, effective March 11, 1979. Amended: Filed Sept. 14, 2010, effective June 30, 2011. *Original authority: 644.026, RSMo 1972, amended 1973, 1987, 1993, 1995, 2000.