1. THE DESIGN CRITERIA FOR WASTEWATER SYSTEMS (30 TAC Chapter 217)
Title Page
THE DESIGN CRITERIA FOR WASTEWATER SYSTEMS (30 TAC Chapter 217)
Water Quality/Stormwater Seminar
October 12, 2016
Water Quality/Stormwater Seminar
October 12, 2016

2. Presented By: Louis C. Herrin, III, P.E.
Engineer, Water Quality Division
Louis C. Herrin, III, P.E.
Engineer, Water Quality Division
A picture of Louis Herrin

3. chapter 217 Subchapter A Subchapter B Subchapter C Subchapter D
Administrative Requirements
Subchapter A
Treatment Facility Design Requirements
Subchapter B
Conventional Collection Systems
Subchapter C
Alternative Collection Systems
Subchapter D
Preliminary Treatment Units
Subchapter E
Activated Sludge Systems
Subchapter F
Fixed Film and Filtration Units
Subchapter G
Natural Treatment Facilities
Subchapter H
Sludge Treatment Units
Subchapter J
Chemical Disinfection
Subchapter K
UV Light Disinfection
Subchapter L
Safety
Subchapter M
Chapter 217
Subchapter A Administrative Requirements
Subchapter B Treatment Facility Design Requirements
Subchapter C Conventional Collection Systems
Subchapter D Alternative Collection Systems
Subchapter E Preliminary Treatment Units
Subchapter F Activated Sludge Systems
Subchapter G Fixed Film and Filtration Units
Subchapter H Natural Treatment Facilities
Subchapter J Sludge Treatment Units
Subchapter K Chemical Disinfection
Subchapter L UV Light Disinfection
Subchapter M Safety

4. chapter 217 Check the status of your summary transmittal letter.
Check the status of your summary transmittal letter.
A picture is the web page box that you can check the status of your project.

5. History of Wastewater Treatment Design Criteria in Texas
The first consolidated design criteria was adopted by Texas State Department of Health on 9/18/1950.
This document was revised on 9/11/1961, 9/18/1968, 9/13/1970, 9/1/1974, 6/1/1981, 4/20/1990, 8/28/2008, 12/4/2015
The first consolidated design criteria was adopted by Texas State Department of Health on 9/18/1950.
This document was revised on 9/11/1961, 9/18/1968, 9/13/1970, 9/1/1974, 6/1/1981, 4/20/1990, 8/28/2008, and 12/4/2015
A picture of cover of the 9/18/1968 design criteria booket

6. Subchapter - A Administrative requirements

7. PURPOSE AND APPLICABILITY
Section (Applicability)
The grandfathering clause:
The existing wastewater treatment system is subject to the design requirements at the time of approval
Section (Applicability)
the grandfathering clause
The existing wastewater treatment system is subject to the design requirements at the time of approval

8. Re-adoption of the Chapter 317

9. SOME IMPORTANT DEFINITIONS
MAINTENANCE
REHABILITATE
ALTER or ALTERATION
GRAVITY RELIEF SEWER
DESIGN FLOW
GRINDER PUMP
EQUALIZATION BASIN
INNOVATIVE TECHNOLOGIES
MAINTENANCE
REHABILITATE
SURCHARGE
GRAVITY RELIEF SEWER
DESIGN FLOW
GRINDER PUMP
EQUALIZATION BASIN
ALTER

10. APPLICABILITY EXAMPLES FOR ALTER
Replaced a gravity thickener with a belt press and plan to use thickener as a digester instead.
Replace a treatment unit or a collection system unit.
Modify in a way that changes:
capacity;
function;
process;
mode of operation;
configuration;
a design parameter;
a major design assumption

11. APPLICABILITY EXAMPLES REHABILITATION
Repair of a collection system using a lining or coating method.
Trenchless technologies:
Cement mortar lining
Epoxy spray lining
Cure in place piping
Slip lining 
Other trenchless method of installing, replacing, or repairing  
Rehabilitate a portion of a 50-year old collection system by cleaning, televising and spraying an epoxy lining inside the pipe.
Repair of a collection system using a lining or coating method.
Trenchless technologies:
Cement mortar lining
Epoxy spray lining
Cure in place piping
Slip lining 
Other trenchless method of installing, replacing, or repairing Rehabilitate a portion of a 50-year old collection system by cleaning, televising and spraying an epoxy lining inside the pipe.
Rehabilitate a portion of a 50-year old collection system by cleaning, televising and spraying an epoxy lining inside the pipe
These are subject to review under the proposed 30 TAC 217 criteria

12. APPLICABILITY EXAMPLES RE-RATE
Change the design flow or design organic loading of a treatment unit, without altering the unit, based on actual performance data.  
An existing WWTP has a new permit with stricter effluent limitations. Without increasing the flow capacity the plant is going to demolish its activated sludge process and construct a membrane process in its place.
This is subject to the 30 TAC 217.

13. APPLICABILITY EXAMPLES MAINTENANCE
Replacement must not cause alteration.
Scheduled preventative care, repair, or the equivalent replacement of components or appurtenances of a treatment unit or a collection system unit.
Maintenance does not include replacement of a treatment unit or a collection system unit.
Replacement must not cause alteration.
Scheduled preventative care, repair, or the equivalent replacement of components or appurtenances of a treatment unit or a collection system unit.
Maintenance does not include replacement of a treatment unit or a collection system unit.
WWTP replaces the motor on a pump with the same gallons per minute and head rating.
Replacing the squeegee blades on a mechanical clarifier.
These are NOT subject to 30 TAC Chapter 217.
WWTP replaces the motor on a pump with the same gallons per minute and head rating.
Replacing the squeegee blades on a mechanical clarifier.
These are NOT subject to 30 TAC Chapter 217.

14. SUBCHAPTER - B TREATMENT FACILITY DESIGN REQUIREMENTS

15. Organic Loadings and Flows : TABLE B.1.
Source
Remarks
Daily Wastewater Flow (gallons/person)
Wastewater Strength (mg/l BOD5)
Wastewater Strength
(mg/l NH3-N)
Municipality
Residential
75-100
15-75
Subdivision
Trailer Park (Transient)
2½ Individuals per Trailer
50-60
Mobile Home Park
3 Individuals per Trailer
50-75
300
School
Cafeteria & Showers Cafeteria/No Showers
20 15
Recreational Parks
Overnight User Day User
30 5
Office Building or Factory
A facility must be designed for the largest shift 20
Hotel/Motel
Per Bed
Restaurant
Per Meal
7-10
1000*
Restaurant with bar or cocktail lounge
9-12
Hospital
200
Nursing Home
Alternative Collection Systems (Subchapter D)
Per Capita 75
N/A
*Based on a restaurant with a grease trap
Picture of table from the rules showing that NH3-N was added to the existing tables with a range from 15 to 75 mg/l for municipality.

16. Some things to remember
The differences between the permitted flow from max 30 day average and annual average
The minimum information needed to rerate a wastewater treatment plant
Emergency power requirements in and (Clarity & Consistency)
Flow measurement weirs for small plants
The differences between the permitted flow from max 30 day average and annual average
The minimum information needed to rerate a wastewater treatment plant
Emergency power requirements in and (Clarity & Consistency)
Flow measurement weirs for small plants

17. Some things to remember
One hundred-year flood plain requirements
Buffer Zones and Odor Abatement
Power reliability to be determined using records from past 60 consecutive months instead of past 24.
One hundred-year flood plain requirements
Buffer Zones and Odor Abatement
Power reliability to be determined using records from past 60 consecutive months instead of past 24.

18. SUBCHAPTER - C CONVENTIONAL COLLECTION SYSTEMS

19. Pipe Design Bending of gravity and force main pipes is prohibited.
Requirement for gaskets operate properly at atmospheric pressure
Equation (k)(4) to refer to the structural calculation in equation (k)(2)
Bending of gravity and force main pipes is prohibited
Requirement for gaskets operate properly at atmospheric pressure
Equation (k)(4) to refer to the structural calculation in equation (k)(2)

20. In Cases when Collection system cannot be located at least nine feet away from water supply line
A picture of a table from the design criteria showing what rules apply to water line separation from wastewater lines.

21. Minimum and Maximum Pipe Slopes: Table C.2
IA picture of a table from the design criteria showing the minimum and maximum pipe slopes

22. Trench Cross Section Showing Terminology
A picture of a from the design criteria showing a typical trench cross section with the terminology.

23. Maximum Manhole Spacing: Table C3
Requirement for engineer to specify an appropriate national reference standard for sealing manhole covers
Clarify locations where bolted and gasketed manholes are required
Maximum Manhole Spacing: Table C3
Requirement for engineer to specify an appropriate national reference standard for sealing manhole covers
Clarify locations where bolted and gasketed manholes are required
Maximum Manhole Spacing: Table C3
A picture of a table from the design criteria showing manhole spacing by the pipe diameter

24. TESTING REQUIREMENTS FOR MANHOLES
Correct units in (b)(2)(d), related to tightening external clamps on the vacuum testing cover
Allow ASTM testing requirements for manholes
Correct units in (b)(2)(d), related to tightening external clamps on the vacuum testing cover
Allow ASTM testing requirements for manholes
A picture showing a test form

25. Lift stations Some Requirements Hoisting equipment and access
Separate pipes for sump pumps
Expected peak flow and firm pumping capacity
Picture of a lift station

26. Lift stations Some Other Requirements:
Add backup high water float requirement for wet well level detection
Control pad must be large enough for personnel to do electrical work safely
Ladders and access hatches must also meet OSHA
Non-corrosive vents for all lift stations
Explosion-proof equipment for all lift stations
Some other Requirements:
Add backup high water float requirement for wet well level detection
Clarifications
Control pad must be large enough for personnel to do electrical work safely
Ladders and access hatches must also meet OSHA
Non-corrosive vents for all lift stations
Explosion-proof equipment for all lift stations

27. EMERGENCY PROVISIONS FOR LIFT STATIONS
Clarify that generators or auxiliary pumps may be used
Add minimum fuel tank size requirements based on hours of fuel
Use of collection system or spill containment as a sole system for preventing discharge to be prohibited
Clarify quick connection design and generator electric loading design
Clarify that generators or auxiliary pumps may be used
Add minimum fuel tank size requirements based on hours of fuel
Use of collection system or spill containment as a sole system for preventing discharge to be prohibited
Clarify quick connection design and generator electric loading design

28. FORCE MAINS Fatigue life calculation requirements
Consider basing minimum velocities on the smallest pump operating at full speed
Consider additional flushing requirement for variable speed pumps that normally operate below minimum velocities
Clarify that air release valves must be non-corrosive
Add fatigue life calculation requirements
Consider basing minimum velocities on the smallest pump operating at full speed
Consider additional flushing requirement for variable speed pumps that normally operate below minimum velocities
Clarify that air release valves must be noncorrosive

29. Materials for Force Main Pipes Identification of Force Main Pipes
FORCE MAINS
Materials for Force Main Pipes
Force Main Pipe Joints
Identification of Force Main Pipes
Force Main Design
Force Main Testing
Materials for Force Main Pipes
Force main pipe joints
Identification of the Force Main Pipes
Force Main Design
Force Main Testing

30. Some other sections
SECTION - §217.69: Requirements for inspecting and maintaining wastewater collection systems and post-installation inspections of collection system rehabilitation projects
SECTION - §217.70: Collection system for Reclaimed Water Facilities
SECTION - §217.69: Requirements for inspecting and maintaining wastewater collection systems and post-installation inspections of collection system rehabilitation projects
SECTION - §217.70: Collection system for Reclaimed Water Facilities

31. SUBCHAPTER - E PRELIMINARY TREATMENT UNITS

32. Some Important Sections
General Preliminary Treatment Requirements
Grinding devices vs screening devices
Coarse Screens and Fine Screens
Grit Removal Systems, Grit Chambers and Grit Handling
General Preliminary Treatment Requirements
Grinding devices vs screening devices
Coarse Screens and Fine Screens
Grit Removal Systems, Grit Chambers and Grit Handling
Two pictures of bar screens

33. Some Important Sections
Requirements for flow Equalization Basins
Primary Clarifiers
Requirements for flow Equalization Basins
Primary Clarifiers
A picture of a clarifier

34. SUBCHAPTER - F ACTIVATED SLUDGE SYSTEMS

35. Activated Sludge Systems
Requirements for an Aeration Basin
Requirements for Clarifiers.
Requirements for Both Aeration Basins and Clarifiers.
Aeration Basin and Clarifier Sizing--Traditional Design.
Aeration Equipment Sizing.
Requirements for an Aeration Basin
Requirements for Clarifiers.
Requirements for Both Aeration Basins and Clarifiers.
Aeration Basin and Clarifier Sizing--Traditional Design.
Aeration Equipment Sizing.
A picture of a cross-section of a clarifier

36. SUBCHAPTER - G FIXED FILM AND FILTRATION UNITS

37. NEW TECHNOLOGY Add requirements for cloth media filters
a picture of a cloth filter

38. SUBCHAPTER - H NATURAL TREATMENT FACILITIES

39. Natural Systems
Considerable rewording done to § Design Criteria for Natural Treatment Facilities
Corrected aerated pond treatment efficiency equation
Considerable rewording done to § Design Criteria for Natural Treatment Facilities
Corrected aerated pond treatment efficiency equation
A picture of liner of a pond

40. SUBCHAPTER - K CHEMICAL DISINFECTION

41. Chlorination/Dechlorination Systems
Clarify intent related to tank placement for spill containment
Allow a minimum length to width ratio as an alternate to modeling for chlorine mixing
Clarify intent related to tank placement for spill containment
Allow a minimum length to width ratio as an alternate to modeling for chlorine mixing
A picture of several 150 pound chlorine tanks.

42. SUBCHAPTER - M SAFETY

43. SAFETY AND SECURITY AUDITS
Require the owner to conduct annual audits and to prepare and implement a corrective action plan.
Require the owner to conduct annual audits and to prepare and implement a corrective action plan.

44. QUESTIONS?
A background picture of a Question Mark?