Colorado Department of Public Health and Environment
Water Quality Control Division
4300 Cherry Creek Drive South, B2
Denver, Colorado 80246-1530
303-692-3500
Regulation 22 – Domestic Wastewater
Step 3: Process Design Report Checklist
DRAFT
2/9/2016 1:51 AM
Process Design Report (PDR) Submittal Checklist
In accordance with Regulation 22 - Site Location and Design Approval Regulations for Domestic Wastewater Treatment Works
(Regulation 22), Section 22.11(1)(par. 1), the design review process is a two step process that includes submittal of a process design
report (PDR) for review and approval by the Division followed by submittal of the final design documents (plans and specifications) for
review and approval by the Division. Please note that Process Design Reports are not required for outfall sewers or lift stations.
Project and System Information
Project Title
System Name
County
Site Location Approval Number and Date
Date of Process Design Report Submittal
CDPS Permit No.
Policy 96-1
Citation
Process Design Report Requirements
Applicant to fill out
Included/Addressed
in Site Location
Location in
Submittal?
Submittal
Yes/No/NA
(page)
1.3.1 General
1.3.0
1.3.1(a)
The PDR shall include the Basis of Design for each unit process utilized for
the wastewater treatment plant. The Process Design Report shall include any
controlling assumptions instrumental to the functional design of the
wastewater treatment facilities as a whole an of each component unit.
Description and purpose of project, location, climate, topography, geology and
local hydrology.
1.3.1(b)
Brief description of existing plant (if any).
1.3.1(c)
Description of contributing service areas.
1.3.1(d)
Historical (to the extent available or relevance), present, and projected,
population figures.
1.3.1(e)
Flow and loading calculations (present and projected) including any
commercial and industrial contributions and allowing for infiltration/inflow.
1.3.1(f)
Field survey data including wastewater strength (present and projected), and if
needed, volume and strength of industrial and commercial wastes.
1.3.1(g)
Colorado Discharge Permit System (CDPS) permit limits or preliminary
effluent limits issued during the Site Approval Process.
Soil investigations and core borings, flood plain location, wetland areas, water
rights impacts, and agricultural lands.
1.3.2 Design Calculations
1.3.1(h)
Design calculations should be submitted that can be easily used to compare
design parameters to the applicable criteria, especially for biological treatment
components and clarifiers.
1.3.3 Process Design Report Technical Elements
Facility layout drawing showing the wastewater treatment plant in relation to
1.3.3
the remainder of the collection system.
1.3.2
1.3.3(a)
1.3.3(b)
1.3.3(c)
1.3.3(d)
Size and location of plant structures.
Schematic flow diagram showing the flow through various unit processes
including a preliminary hydraulic profile.
General piping arrangements including any by-pass of individual units,
material handled and direction of flow through pipes.
Flow and solids balance showing the flows of raw wastewater, supernatant
liquor, all return flows and sludge flows at average and peak design
Revised March 2010
Page 1 of 5
Policy 96-1
Citation
Process Design Report Requirements
Applicant to fill out
Included/Addressed
in Site Location
Location in
Submittal?
Submittal
Yes/No/NA
(page)
conditions.
1.3.3(e)
Pump location, type and size.
Type of Treatment, including:
Location and topography of plant site.
Effect of industrial wastes likely to be encountered.
1.3.3(f)
Operating costs, flexibility, and level of treatment required.
Probable type of supervision and operation the plant will have.
Ultimate costs to the users.
Design Flow Rate:
Design basis including average daily per capita flow.
1.3.3(g)
Industrial and commercial wastewater flows added.
Existing collection system present flow plus allowance for I&I, estimated
future increase in population, commercial and industrial contributions.
Industrial waste contributions or other special factors requiring special
1.3.3(h)
treatment processes or other contributions that may impact raw wastewater
strength and volume in the design of the facility.
Calculations showing average, maximum month, and peak flows and organic
1.3.3(i)
loads (and for nutrient loads, when applicable due to permit limits) for present
and design conditions, for each treatment unit.
Process design parameters for each treatment unit process referencing the
1.3.3(j)
applicable design criteria
Oxygen Transfer calculations and data used for oxygen transfer equations.
1.3.3(k)
Including blower or aerator sizing and air flow requirements for treatment and
mixing.
1.3.4 Preliminary Operating Plan
Preliminary plan of operation including the following:
Number of operators, certification level, shifts per week.
Expected basic operating configuration and process control procedures
(P&ID if available).
1.3.4
Residuals Management plan.
Phased operation to maintain permit compliance (if applicable during
construction).
Emergency response concept.
1.6.0 New Technology Design Review Requests and Variances
Proposed design includes new technologies not covered by the criteria (or not
1.6.1
previously used by the State).
1.6.1(a)
Administrative Documentation for New Technology items 1 - 6 addressed.
1.6.1(b)
1.6.2
1.6.2(a)
Technical Documentation for New Technology items 1 - 8 addressed.
Design Criteria Variance Requests.
Administrative Documentation for Variance Request items 1 - 3 addressed.
1.6.2(b)
Technical Documentation for Variance Request items 1 - 3 addressed.
4.0 General Design Criteria for Wastewater Treatment Facilities
4.1.0
General items addressed.
4.2.1
Flow metering/measuring items (a) - (e) addressed.
4.2.2
Design Loading items (a) - (b) addressed.
4.2.3
Conduits addressed (Piping and channels).
4.2.4
Arrangement and reliability of units addressed.
4.2.5
Critical environmental conditions addressed.
Revised March 2010
Page 2 of 5
Policy 96-1
Citation
4.3.1
Process Design Report Requirements
Installations of mechanical equipment addressed.
4.3.2
By-passes addressed.
4.3.3
Drains addressed.
4.3.4
Construction Materials addressed.
4.3.5
Painting addressed.
4.3.6
Operating equipment addressed.
4.3.7
Grading and Landscaping addressed.
4.4.1
Emergency power facilities addressed.
4.4.2
Water Supply addressed.
4.4.3
Sanitary Facilities addressed.
4.4.4
Laboratory Space and Equipment addressed.
4.4.5
Floor slope addressed.
4.5.0
Building and heat addressed.
Applicant to fill out
Included/Addressed
in Site Location
Location in
Submittal?
Submittal
Yes/No/NA
(page)
4.6.2
Facility Operations and Maintenance Manual addressed.
5.0 Specific Unit Design Criteria for Wastewater Treatment Facilities
5.1.0
Preliminary Treatment Section items addressed.
5.2.0
Wastewater Ponds and Lagoons – General Section items addressed.
5.3.0
Non-Aerated Lagoon (Waste Stabilization Pond) Section items addressed.
5.4.0
Mechanically Aerated Lagoon Systems Section items addressed.
5.5.0
Polishing Ponds Section items addressed.
5.6.0
Wetland Systems – General Section items addressed.
5.7.0
Free Surface Flow Wetlands Section items addressed.
5.8.0
Subsurface Flow Wetlands Section items addressed.
5.9.0
Overland Flow Systems Section items addressed.
5.10.0
Slow Rate Land Application Section items addressed.
5.11.0
Subsurface Disposal Systems Section items addressed.
5.12.0
Filtration Section items addressed.
5.13.0
Clarifiers Section items addressed.
5.14.0
Activated Sludge Facilities Section items addressed.
5.15.0
Attached Growth Facilities Section items addressed.
5.16.0
Disinfection Section items addressed.
6.0 Biosolids (Sludge) Digestion and Disposal
6.1.0
General Section items addressed.
6.2.0
Anaerobic Separate Biosolids Digestion Facilities Section items addressed.
6.3.0
Aerobic Sludge Digestion Facilities Section items addressed.
6.4.0
Biosolids Dewatering and Thickening Section items addressed.
7.0 Advanced Treatment
7.1.0
General Section items addressed.
7.2.0
Chemical/Physical Treatment Section items addressed.
7.3.0
Advanced Biological Processes Section items addressed.
7.4.0
8.0 Safety
8.1.0
8.2.0
Land Disposal of Effluent Section items addressed.
Disinfection Facilities Section items addressed.
Anaerobic Digestion Facilities Section items addressed.
Revised March 2010
Page 3 of 5
Policy 96-1
Citation
8.3.0
Process Design Report Requirements
Miscellaneous Provisions Section items addressed.
Revised March 2010
Applicant to fill out
Included/Addressed
in Site Location
Location in
Submittal?
Submittal
Yes/No/NA
(page)
Page 4 of 5
I hereby certify that I was the engineer in responsible charge for (identify portions of work)
during the preparation of the process design report for the above-referenced project. I affirm that design is consistent with the approved
site location approval and the most recent published version of Design Criteria Considered in the Review of Wastewater Treatment
Facilities Policy 96-1 (Policy 96-1), and that all variance requests are listed on this form.
Typed Name of Professional Engineer
Date Signed
Signature of Professional Engineer
License #
Variance Request Declarations
Policy 96-1 Requirement
(e.g., Section 4.4.0 Emergency
No.
Power Facilities)
1
P.E. Stamp and Signature
Policy 96-1 Variance Request
(attach additional information as needed per requirements
of Part 1.6.2 of Policy 96-1)
Location in
Submittal
(page)
2
3
4
5
6
7
Please supplement the Variance Request Declarations on additional sheets as necessary.
Revised March 2010
Page 5 of 5