Current through Register Vol. 49, No. 6, March 15, 2024
PURPOSE: This rule provides the minimum criteria for
the preparation of engineering reports and facility plans and specifications
related to the design of wastewater systems. This rule is to be used with rules
10 CSR 20-8.110 through
10 CSR
20-8.210 for the planning and design of a wastewater
treatment facility. It does not address all aspects of design, and the design
engineer may refer to other appropriate reference materials so long as these
minimum standards set forth in this rule are met.
(1) Applicability. Engineering reports and
facility plans and specifications shall be prepared based on criteria contained
in this rule, published standards, applicable federal and state requirements,
standard textbooks, current technical literature, and applicable safety
standards. In the event of any conflict between the above criteria, the
requirement in this rule shall prevail.
(A)
This rule shall not apply to treatment units covered in
10 CSR
20-8.300.
(B) This rule shall not apply to treatment
units covered in 10 CSR
20-8.500.
(2) General. All documents submitted to the
Missouri Department of Natural Resources (department) for the purpose of
complying with this rule shall be prepared, signed, sealed, and dated by a
Missouri registered professional engineer.
(A) Submittal. The design engineer must
submit a project engineering report or facility plan to the department and
receive department approval prior to submitting permit applications, plans,
specifications, and fees.
(B)
Engineering Reports or Facility Plans.
1.
Engineering reports must be completed for projects involving collection
systems, pumping stations, and force mains.
2. Facility plans must be completed for
projects involving wastewater treatment facility projects and projects
receiving department funding through the grant and loan programs under 10 CSR
20-4, Grants and Loans.
(C) Approval. Engineering report or facility
plan approval does not authorize construction.
(3) Hydraulic and Organic Waste Load.
(A) Existing Systems shall-
1. Use actual flow data that accurately
represent the average and peak flows to calculate projections for hydraulic
capacity;
2. Include contributions
from existing upstream combined sewers that will affect interceptor sewers and
treatment facilities;
3. Use actual
data that accurately represent organic waste load to calculate projections for
organic capacity; and
4. Include
documented hydraulic and organic waste load contributions of industrial sources
in the calculations of projected capacity.
(B) New Collection and Wastewater Treatment
Systems.
1. Hydraulic capacity for wastewater
facilities and new collection systems.
A.
Flow estimates for the design average flow and design peak hourly flow,
including origin of the flow estimates and any assumptions, shall be
identified.
B. Peaking factor. The
average design flow value shall be used in conjunction with a peaking factor
from the following Equation 110-1, included herein.
Equation 110-1. Ratio of peak hourly flow to design average
flow.
Peaking Factor = Q Peak Hourly / Q Design Avg = (18 +
[ROOT]P) / (4 + [ROOT]P)
Where:
Q Peak Hourly = design peak hourly flow
Q Design Avg = design average flow
P = Population in thousands
C. Where the new collection system is to
serve existing development, the likelihood of inflow and infiltration (I/I)
contributions from existing service lines shall be evaluated.
2. Organic Waste Load. Organic
waste load estimates shall be identified for all contributing parameters such
as the design average five (5)-day Biochemical Oxygen Demand
(BOD5).
(C) Drinking Water Use Records. Facilities
proposing drinking water usage as the basis for design average flow must
provide at least one (1)-year of drinking water use records in the following
form:
1. A minimum of twelve (12) continuous
months of drinking water use records for facilities that discharge year-round;
or
2. A minimum of continuous daily
water use records during the entirety of an operating season for facilities
having critical operational schedules (e.g., recreational areas, campuses, and
industrial facilities).
(D) Re-Rating a Wastewater Treatment
Facility. A wastewater treatment facility owner must request department review
and approval when proposing to re-rate an existing wastewater treatment
facility's current design hydraulic capacity or organic waste loading. An
engineering re-rating analysis must demonstrate the wastewater treatment
facility can reliably operate at the proposed re-rated loading rate. The
re-rating analysis shall include the following:
1. Hydraulic Capacity. Evaluate the annual
average flow, the maximum monthly average flow, the maximum daily flow, and the
ratio of the peak flow to annual average flow using the last five (5) years'
wastewater treatment facility. Include all calculations and assumptions.
A. Calculate the design average flow using
the wastewater treatment facility's average annual flow plus one (1) standard
deviation for a wastewater treatment facility that will not be affected by
future growth; or
B. Calculate the
design average flow using the anticipated changes from the existing flow for a
wastewater treatment facility that will be affected by future growth.
2. Organic Waste Load. Evaluate
the design organic waste loading based on the average daily organic load.
A. Include the data from the analyses of at
least three (3) twenty-four (24)-hour composite samples of the influent
waste-water per week, taken during days with representative flow, for a period
of at least three (3) months during both wet and dry weather
conditions;
B. Include sample data
of the following parameters unless monitoring of the parameter is not a
requirement of the National Pollutant Discharge Elimination System (NPDES)
permit: BOD5, Total Suspended Solids (TSS), ammonia,
total nitrogen, and total phosphorus;
C. Include the influence of hydraulic
capacity evaluation from subparagraph (3)(D)1.A and B. of this rule;
and
D. Evaluate the size of each
unit process to determine if they are appropriately sized to provide adequate
treatment based on the re-rated design organic waste load.
3. Existing unit processes. Evaluate each
unit process for its design and peak capacity. Normally one (1) unit process
will be most restrictive in terms of design capacity. Include solids
processing, handling, and storage in this analysis.
4. Compliance. Evaluate the proposed change
of the facility's ability to reliably and consistently comply with the NPDES
permit effluent limitations and conditions.
5. Growth. Evaluate the system's anticipated
rate of growth.
(4) Engineering Report. Engineering reports
shall include the following:
(A) Cover Page.
Include a statement identifying the owner and continuing authority (refer to
10 CSR
20-6.010(2)(A)), a contact person for
each (including phone number and address), and engineer in accordance with
section (2) of this rule;
(B)
Problem Defined. Include a description of the existing system and an evaluation
of the conditions and problems needing correction;
(C) Hydraulic Capacity and Organic Waste
Load. Establish the anticipated design average and design peak flows and
organic loads for the existing and ultimate conditions. Include the basis of
the projection reflecting the existing or initial service area, and the
anticipated future service area. More detail on flow and organic waste load
information and data needed for new and existing collection systems are
included in section (3) of this rule;
(D) Impact on Existing Wastewater Facilities.
Evaluate the impact of the proposed project on downstream existing waste-water
systems (including gravity sewers, alternative sewers, pumping stations, force
mains, and treatment facilities);
(E) Project Description. Provide a written
description of the project;
(F)
Location Drawings. Provide drawings identifying the site of the project and
anticipated location and alignment of proposed facilities;
(G) Engineering Criteria. Include design
criteria for the proposed project;
(H) Site Information. Provide project site
information, where applicable, including topography, soils, geologic
conditions, depth to bedrock, groundwater level, distance to water supply
structures, roads, residences, and other pertinent site information;
(I) Alternative Selection. Discuss the
reasons for selection of the proposed alternative, including any pumping
station sites, feasibility, and how the project fits into a long term plan;
and
(J) For flood protection follow
the provisions listed in
10 CSR
20-8.140(2)(B).
(5) Facility Plan. Facility plans shall
include the following, in addition to the information in section (4) of this
rule:
(A) Planning and Service Area. Include a
description or drawings of the planning area, existing and potential future
service areas, the site of the project, and anticipated location of the
proposed facilities;
(B) Population
Projection and Planning Period. Base the present and predicted population on a
twenty (20)-year planning period. Consider phased construction of wastewater
facilities in rapid growth areas. Design sewers and other facilities with a
design life in excess of twenty (20) years for the extended period;
(C) Wastewater Treatment Facility Design
Capacity. The waste-water treatment facility design capacity is the design
average flow at the design average BOD5. Establish the
anticipated design average and design peak flows and waste loads for the
existing period in accordance with section (3) of this rule. Include the basis
of the projection of initial and future flows and waste loads;
(D) Initial Alternative Development. Discuss
the process of selection of wastewater treatment alternatives for detailed
evaluation. Include all wastewater management alternatives considered,
including no action, and the basis for the engineering judgment for selection
of the alternatives chosen for detailed evaluation;
(E) Detailed Alternative Evaluation. Include
the following for the alternatives to be evaluated in detail:
1. Collection system revisions. Evaluate the
proposed revisions to the existing collection system including adequacy of
portions not being changed by the project;
2. Wet weather flows. Provide facilities to
transport and treat wet weather flows in a manner that complies with federal,
state, and local regulations;
3.
Evaluate the no-discharge option and include it as an alternative in the
facility plan. Also refer to
10 CSR
20-6.010(4)(A)5;
4. Evaluate the regionalization option and
include it as an alternative in the facility plan;
5. Include the information outlined in
10 CSR
20-8.200(2) when the project includes
wastewater irrigation or subsurface soil dispersal;
6. Site Evaluation. Consider the following
criteria during site evaluation. Take appropriate measures to minimize adverse
impacts when a site is critical with respect to the following items:
A. Consider compatibility of the treatment
process with the present and planned future land use, including noise,
potential odors, air quality, and anticipated solids processing and disposal
techniques. 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. Refer to
10 CSR
20-8.140(2)(C) for minimum separation
distances;
B. Identify zoning and
other land use restrictions;
C.
Evaluate the accessibility and topography of the site;
D. Identify areas for future facility
expansion;
E. For flood protection,
follow the provisions listed in
10 CSR
20-8.140(2)(B);
F. Include geologic information, depth to
bedrock, karst features, or other geologic considerations of significance to
the project;
G. A request for a
geohydrologic evaluation conducted by the department's Missouri Geological
Survey is required in the following instances:
(I) All new wastewater treatment facilities
to identify stream determinations (gaining or losing);
(II) All new outfalls or relocated
outfalls;
(III) All new or major
modifications to earthen basin structures. Earthen basin structures shall not
be located in areas receiving a severe collapse potential rating. Earthen basin
structures located in areas receiving a severe overall geologic limitation
rating are reviewed on a case-by-case basis. Earthen basin structures located
in areas receiving a moderate collapse potential rating with an appropriate
engineering solution are reviewed on a case-by-case basis; and
(IV) All new features (e.g. wastewater
irrigation sites, subsurface soil dispersal sites);
H. Protection of groundwater including public
and private wells shall be provided. When the proposed wastewater facilities
will be near a water source or other drinking water facility, as determined by
the Missouri Geological Survey or by the department's Public Drinking Water
Branch, include an evaluation addressing the allowable distance between these
wastewater facilities and the water source. Refer to
10 CSR
20-8.140(2)(C);
I. Determine the soil type and suitability
for construction and depth to normal and seasonal high groundwater;
J. Submit a soil morphology analysis
conducted by a qualified soil scientist for all subsurface soil dispersal
systems. Refer to section (7) of this rule;
K. Identify the location, depth, and
discharge point of any field tile or curtain drain in the immediate area of the
proposed site;
L. Include the
present and known future effluent quality and monitoring
requirements;
M. Provide a
discussion of receiving waterbody access for the outfall line; and
N. Include a preliminary assessment of site
availability;
7.
Engineering criteria. Provide the engineering criteria and assumptions used in
the design of the project. Provide the basis for unit operation and preliminary
unit process sizing;
8. Location
Drawings. Provide drawings identifying the site of the project and anticipated
location and alignment of proposed facilities;
9. Flow diagram. Provide a preliminary flow
diagram of treatment facility alternatives including all recycle
flows;
10. Removal efficiencies.
Provide estimated loadings to and removal efficiencies through each unit
operation in addition to total removal efficiency and effluent quality (both
concentrations and mass);
11.
Emergency operation. Provide a discussion of emergency operation measures as
outlined in 10 CSR
20-8.140(7)(A);
12. New and innovative technology. See
section (6) of this rule. Provide a contingency plan, in the event that such
new technology fails to meet the expected performance;
13. Nutrient removal. Provide a discussion of
nutrient removal capabilities including the footprint available for expansion
or treatment facility modifications necessary for nutrient removal for each
alternative;
14. Solids. Include
the solids handling and disposal alternatives considered and method selected
consistant with the requirements of
10 CSR
20-8.170 and any conditions in the NPDES
permit;
15. Treatment during
construction. Develop a plan for the method and level of treatment (including
solids processing, storage, and disposal) to be achieved during construction
and include it in the facility plan. Refer to paragraph (9)(A)5. and subsection
(10)(C) of this rule;
16. Cost
estimates. Present cost estimates for capital construction cost, annual
operation and maintenance cost (including basis), and a twenty (20)-year
present worth cost for each alternative;
17. Environmental review. Include any
additional environmental information meeting the criteria in
10 CSR
20-4.050, for projects receiving funding through the
state grant and loan programs; and
18. Water quality reports. Submit all
reviews, studies, or reports in accordance with 10 CSR 20-7, Water Quality;
and
(F) Final Project
Selection. Present the selected project from the alternatives considered under
paragraph (5)(E) of this rule, including the financing considerations and
recommendations for implementation of the plan. Provide a project
implementation schedule identifying project milestones.
(6) New and Innovative Technology.
(A) Evaluation of Technology Performance. To
determine if new technologies of wastewater treatment processes and equipment
or applications have a reasonable and substantial chance of success, the
facility plan prepared for department approval shall include the following:
1. Monitoring observations, including test
results and engineering evaluations demonstrating the efficiency of processes
or equipment;
2. Detailed
description of the sampling protocol and test methods that are sufficiently
sensitive analytical methods for detecting, identifying, and measuring the
concentrations of pollutants;
3.
Testing, including appropriately-composited samples, under various ranges of
strength and flow rates (including diurnal variations) and waste temperatures
over a sufficient length of time to demonstrate expected performance under the
range of climatic and other conditions that may be encountered in the area of
the proposed installations. A control group may be necessary to demonstrate
effectiveness;
4. Description of
manufacturer's warranty and performance warranty including all exclusions or
limitations on the warranty, when available;
5. Complete design requirements,
calculations, and all assumptions clearly documented and explained;
6. Documentation of how the new process or
equipment functions;
7. A
discussion of actual, full-scale operating experience or pilot test work. For
full-scale operating experience, include the length of time that each
installation has been in operation. For pilot test work, include a copy of the
associated pilot test plan and final pilot test results report;
8. Discussion of known or anticipated
start-up issues and operational issues that have occurred or may occur during
the first year of operation;
9. A
description of specific operator knowledge and skills needed to operate the
proposed technology including an estimate of increased operator attention
needed during start-up and the first year of operation; and
10. Other appropriate information.
(B) Pilot Test or Demonstration
Plan. Proposals for pilot tests and demonstration projects shall include the
following in addition to the facility plan information in section (5) of this
rule:
1. Goals, objectives, and benefits with
an explanation as to why a pilot study or demonstration project is necessary to
obtain additional engineering data;
2. Literature identifying key design
parameters and related experience;
3. A description of the proposal with
schematic diagrams, pictures, drawings, or any other important
information;
4. Complete design
requirements, calculations, and all assumptions clearly documented and
explained;
5. Identification of
associated environmental impacts, both direct and indirect;
6. Detailed description of the sampling
protocol and test methods that are sufficiently sensitive analytical methods
for detecting, identifying, and measuring the concentrations of
pollutants;
7. Complete schedule
for testing and evaluation including start, completion, and submittal of the
pilot test or demonstration results report; and
8. Other appropriate information.
(C) Evaluation of Collected Data.
All raw testing data and the evaluation of the data and performance must be
submitted for department review upon conclusion of the project demonstration.
The evaluation shall identify and justify the removal of any excursions not
representative of the new technology process or equipment from the data
evaluation.
(7) Soils
Report.
(A) Soils. Soil reports are required
for all projects involving subsurface wastewater treatment and disposal. All
soils investigations and resulting reports must be performed, signed, and dated
by a qualified soil scientist as defined in section
701.040,
RSMo. Soil observation pits (i.e., backhoe or hand dug) excavated to a depth to
reveal the major soil horizons shall be utilized.
(B) Soils Report. The soils report resulting
from the investigation shall include the following information:
1. A copy of each soil profile
description;
2. A description of
all drainage features, rock outcrops, erosion, and other natural features that
may influence the soil treatment area;
3. An evaluation of any identified limiting
conditions or geologic risk factors affecting the soil's ability to treat and
disperse effluent, such as karst features, dense tills, clay pans, and
fragipans;
4. Clear and legible
scaled site plans, drawings, or maps identifying all applicable site features
that could impact the soil treatment area(s). Previously prepared or otherwise
available drawings or maps such as a survey prepared by a Missouri registered
professional surveyor; an aerial photograph; a United States Geological Survey
topographic map with the proposed soil treatment area clearly delineated; a
United States Department of Agriculture Natural Resources Conservation Services
county soil survey map with the proposed soil treatment area clearly
delineated; or a digital orthophotograph prepared from a geographical
information system may be used. The following shall be included on the drawings
or maps:
A. The location of all soil
observation pits with the extent of different soils clearly
delineated;
B. Any existing or
proposed dwellings and structures;
C. Any site disturbances such as excavated or
fill areas, existing roadways, and other hardscapes and proposed hardscapes, or
related site disturbances;
D.
Location of all public and private wells, abandoned wells, or geothermal
systems, and surface water features that could either influence or be impacted
by the proposed soil treatment area. For minimum separation distances, follow
the provisions listed in
10 CSR
20-8.140(2)(C);
E. North orientation arrow;
F. Identification of areas with conditions
that would prohibit, limit, or adversely impact the siting of a soil treatment
area including, but not limited to: sinkholes, wetland vegetation, bedrock out-
crops, areas with a slope greater than fifteen percent (15%), and existing or
abandoned field or drainage tiles;
G. Identification of known existing,
proposed, and observed easements and right-of-ways; and
5. A discussion of the findings and
conclusions including the following:
A.
Available area for the soil treatment area;
B. Depth to limiting layers (e.g., water
table, fragipan, bedrock) and the source of this information;
C. Proposed application (loading) rates that
take into consideration the drainage and permeability of the soils and the
distance to the limiting layer.
D.
The source of the application rates for each soil horizon within the specific
soil description;
E. Frequency of
flooding and ponding and the source of this information;
F. Relevant characteristics (e.g., bedrock
outcrops, sinkholes or karst features) on the proposed site or in the
surrounding area that may indicate vulnerability for surface water and
groundwater contamination and the source of this information; and
G. Factors affecting the soils ability to
treat and hydrologically control effluent and the source of this
information.
(C) Imported Soils. When a facility is
importing soils for the subsurface soil dispersal systems, the following shall
be specified:
1. Physical characteristics that
are uniform in texture, structure, and pore space;
2. Transportation methods that ensures
uniformity and consistency of the physical characteristics as close as possible
to the original state upon delivery;
3. A sandy to loamy material, with less than
ten percent (10%) clay and less than fifteen percent (15%) organic debris
present;
4. Methods for removal of
the organic layer;
5. No compaction
of imported soil;
6. Placement in
small "lift" increments of four to six inches (4"-6") instead of one (1) thick
layer; and
7. Native soil is to be
used for the vertical separation for the subsurface soil dispersal systems with
the fill for the cap being imported soils.
(8) Summary of Design. A summary of design
shall accompany the plans and specifications and must include the following:
(A) Flow and waste projections including
design and peak hydraulic and organic loadings for sewers, pump stations, and
wastewater treatment facilities;
(B) Information to verify adequate downstream
capacity of sewers, pump stations, and wastewater treatment and solids handling
unit(s);
(C) Type and size of
individual process units including the following: unit dimensions; rates and
velocities; detention times; concentrations; recycle; chemical additive
control; physical control, flexibility, and flow metering;
(D) Process diagrams, including flow diagrams
with hydraulic capacity and organic waste load;
(E) 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;
(F) Design
calculations, tabulations, and assumptions clearly documented and explained
from 10 CSR
20-8.120 through
10 CSR
20-8.210 used in the design of each unit process and
the system(s) as a whole;
(G) The
appropriate pump curve with the system curve superimposed, as
applicable;
(H) Unusual
specifications, construction materials, and construction methods; maps,
photographs, diagrams; and other support data needed to describe the
system;
(I) Architectural,
structural, and mechanical component design calculations as specified in
10 CSR
20-8.120 through
10 CSR
20-8.210; and
(J) Anticipated effluent
quality.
(9) Plans.
(A) General.
1. Plan components must include the following
components on all plan sheets:
A. A suitable
title block showing the name of the project, owner, and continuing authority
(refer to 10 CSR
20-6.010(2) and
20 CSR
2030-2.050);
B. Scale ratios for mechanical
drawings;
C. Bar scales for aerial
maps;
D. A north arrow;
E. Datum used; and
F. Sheet numbers.
2. Plan format must include clear and
legible plans drawn to a scale that allows necessary information to be seen
plainly. Blueprints and hand-drafted plans are not acceptable
3. Plan contents must include detailed plans
consisting of the following:
A. 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;
B. Dimensions and relative elevations of
structures, the location and outline form of equipment, location and size of
piping, water levels, and ground elevations;
C. All known existing structures and
utilities, both above and below ground, that might interfere with the proposed
construction or require isolation setback, particularly water mains and water
supply structures (e.g., wells, clear wells, basins), gas mains, storm drains,
and telephone, cable, and power conduits. Show the location of all existing and
proposed water supply structures located within five hundred feet (500') of the
proposed or existing wastewater treatment facility; and
D. Locations and logs of test borings, where
applicable. Include test boring logs on the plans or in the specifications as
an appendix.
4. Hydraulic
profile for all wastewater treatment facilities must be included; and
5. Plan for operation during construction.
Specify the procedure for operation during construction that complies with the
plan outlined in paragraph (5)(E)15. and subsection (10)(C) of this
rule.
(B) Plans of
Sewers.
1. General plans. These plans shall
show the following:
A. Geographical features.
(I) Topography and elevations. Clearly show
existing or proposed streets and all streams or water surfaces. Include contour
lines at suitable intervals;
(II)
Streams. Depict the direction of flow in all streams and high and low water
elevations of all water surfaces;
(III) Boundaries. Depict the boundary lines
of the continuing authority and the area to be sewered; and
B. Sewers. Show the location,
size, and direction of flow of relevant existing and proposed sanitary and
combined sewers draining to the treatment facility concerned.
2. Detail plans. Detail plans
shall be submitted showing the following:
A.
Profiles having a horizontal scale of not more than one hundred feet (100') to
the inch and a vertical scale of not more than ten feet (10') to the inch
;
B. Plan views drawn to a
corresponding horizontal scale and shown on the same sheet;
C. Location of streets and sewers;
D. Line of ground surface; pipe size,
material, and type; length between manholes; invert and surface elevation at
each manhole; grade of sewer between each two (2) adjacent manholes; and any
special construction features. Number all manholes on the plan and
correspondingly number them on the profile;
E. Elevation and location of the basement
floor on the profile of the sewer where there is any question of the sewer
being sufficiently deep to serve any residence;
F. Locations of all special features such as
inverted siphons, concrete encasements, elevated sewers, etc.; and
G. Detail drawings to show the following:
(I) All stream crossings with elevations of
the stream bed and ordinary high water mark, normal, and low water levels;
(II) Details of all special sewer
joints and cross-sections; and
(III) Details of all sewer appurtenances such
as manholes, inspection chambers, inverted siphons, regulators, tide gates, and
elevated sewers.
(C) Plans of Wastewater Pumping Stations.
1. Location plans.
These plans must show the following:
A. The location and extent of the tributary
area;
B. Any continuing authority
boundaries with the tributary area;
C. The location of the pumping station and
force main; and
D. Pertinent
elevations.
2. Detail
plans. Detail plans shall show the following, where applicable:
A. Topography of the site;
B. Existing pumping station;
C. Proposed pumping station, including
provisions for installation of future pumps;
D. Maximum elevation of wastewater in the
collection system upon occasion of power failure;
E. Maximum hydraulic gradient in downstream
gravity sewers when all installed pumps are in operation;
F. Test boring and groundwater
elevations;
G. All pumping station
appurtenances such as pumps, valves, level control switches, hatches, safety
equipment, ventilation equipment, and hoisting equipment; and
H. Flood protection map. For flood
protection, follow the provisions listed in
10 CSR
20-8.140(2)(B).
(D) Plans of Wastewater
Treatment Facilities.
1. Location plans.
Location plans shall include the following:
A. The wastewater treatment facility in
relation to the remainder of the system; and
B. Sufficient topographic features to
indicate its location with relation to streams and the point of discharge of
treated effluent.
2.
General layout. Layouts of the proposed wastewater treatment facility shall
show-
A. Topography of the site;
B. Size and location of treatment facility
structures;
C. Schematic flow
diagram(s) showing the flow through various units and showing utility systems
serving the facility processes;
D.
Piping, including any arrangement for unit isolation (identify materials
handled and direction of flow through pipes, including arrangements for
independent operation);
E.
Hydraulic profiles showing the flow of wastewater, supernatant liquor, recycle
streams, and solids; and
F. Test
borings and groundwater elevations.
3. Detail plans. Detail plans shall show the
following, where applicable:
A. Location,
dimensions, and elevations of all existing and proposed treatment facilities
and solids handling facilities;
B.
Elevations of high and low water level of the body of water to which the
facility effluent is to be discharged;
C. Type, size, pertinent features, and
operating capacity of all pumps, blowers, motors, and other mechanical
devices;
D. Minimum, design
average, and peak hourly hydraulic flow in hydraulic profile with wastewater,
supernatant liquor, and solids flow through the treatment facility;
E. Existing and proposed solids storage
volumes in plan and profile;
F.
Adequate description of any features not otherwise covered by the
specifications or facility plan; and
G. Flood protection map. For flood
protection, follow the provisions listed in
10 CSR
20-8.140(2)(B).
(10) Specifications.
(A) Specifications shall accompany the plans.
The initial page shall bear the owner and continuing authority name, and a
contact person for each (including phone number and address).
(B) The technical specifications accompanying
construction drawings shall include the following, 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:
1. The type, size, strength, operating
characteristics, and rating of equipment;
2. Allowable infiltration;
3. The complete requirements for all
mechanical and electrical equipment (including machinery, valves, piping, and
jointing of pipe);
4. Electrical
apparatus, wiring, instrumentation, and meters;
5. Laboratory fixtures and
equipment;
6. Operating
tools;
7. Construction
materials;
8. Special filter
materials (such as stone, sand, gravel, or slag);
9. Miscellaneous appurtenances;
10. Chemicals when used;
11. Instructions for testing materials and
equipment as necessary to meet design standards; and
12. Performance tests for the completed
facilities and component units. It is suggested that these performance tests be
conducted at design load conditions wherever practical.
(C) Operation During Construction.
Specifications shall contain a program for keeping existing wastewater
treatment facility units in operation during construction. Should it be
necessary to take units out of operation, specifications shall include detailed
construction requirements and schedules to maintain compliance with effluent
limitations and the facility's NPDES permit. See paragraphs (5)(E)15. and
(9)(A)5. of this rule.
(11) Revisions to Approved Plans or
Specifications.
(A) General. Any revisions of
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.
(B) Addendum. Addenda must conform to all
requirements in this rule.
(C)
Change Order. The owner, continuing authority, and contractor must sign and
date change orders.
(D) As-Built
Plans. As-built plans clearly showing the alterations must be submitted upon
department request at the completion of the work.
*Original authority: 644.026, RSMo 1972, amended 1973,
1987, 1993, 1995, 2000.