City and County of San Francisco Edwin M. Lee, Mayor DEPARTMENT OF PUBLIC HEALTH Barbara A. Garcia, MPA, Director of Health ENVIRONMENTAL HEALTH Stephanie K.J. Cushing, MSPH, CHMM, REHS

Director of Environmental Health

1390 Market Street, Suite 210 San Francisco, CA 94102

Phone 415-252-3800, Fax 415-252-3875

Non-Potable Engineering Report Instructions (July 2017 Revision)

Authority: Under San Francisco Health Code (SFHC) Article 12C, the San Francisco Department of Public Health (SFDPH) is the Permitting agency for the operation of Alternate Water Source Systems in Residential Buildings containing three or more dwelling units, in non-Residential Buildings, and where alternate water systems are shared across property lines or in multiple structures.

Further, SFDPH is authorized to perform duties associated with regulating the internal uses of recycled water through its general authority to provide for the preservation, promotion, and protection of the health of the inhabitants of the City and County [San Francisco Charter Sec.4.110]; SFHC Articles 11 and 12A authorize SFDPH to investigate and abate any nuisance, activity, or condition deemed a threat to public health and safety, and to investigate and abate any cross connection risks between potable and non-potable water and sanitation systems in both public and private facilities. SFDPH is authorized by the Health Code to order a person to vacate property, cease prohibited activities, abate unsafe or unsanitary conditions, and pay penalties for violations.

The Engineering Report is a requirement of SFHC Article 12C. Final or conditional approval of the report must be obtained prior to seeking a plumbing permit from the Department of Building Inspection.

Template: These instructions and the associated template are intended to aid project applicants in preparing an Alternate Water Source System Engineering Report. The minimum necessary report elements—sections, tables, figures, and appendices-—are included.

The template contains sample tables. Where necessary, the tables may be restructured.

Complex systems may need to provide information, tables and/or figures in addition to the minimum necessary contained in the template.

For more information on the permitting process please see the Rules and Regulations for the operation of Alternate Water Source Systems.

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Instructions

The Engineering Report Template is available as a word (.dot) document. The template is appended to these instructions.

Note: Additional information/subsections may be required for more complex systems.

1. GeneralThis section must provide a general overview of the alternate water source system and describe the objective(s) of the project and facility information.

• Identify the nature of the water source, treatment proposed, water use, and use area.• Present an estimated schedule for project implementation that considers the building

construction schedule.• Include a vicinity map and a plan/layout of the Alternate Water Source System.

Required Figure 1: Vicinity Map and Plan/Layout of the Alternate Water Source System, including use sites, kinds and locations of plumbing fixtures, distribution plumbing, public access, and land uses of surrounding area

2. Rules and RegulationsThis section must include the following standard language to acknowledge that the project developers understand the engineering report requirement under applicable local laws:

Required Standard Language: Submittal of this Engineering Report is a requirement under applicable San Francisco Codes; final or conditional approval of the report will be obtained prior to seeking a plumbing permit from the Department of Building Inspection.

3. Responsible Party and Project ParticipantsThis section is used to demonstrate that the Responsible Party has the technical and managerial capacity to build and operate the proposed project.

• Identify and describe the Responsible Party as well as the Supplier, Producer, and User.• If more than one entity is involved, describe the roles and responsibilities of each with

respect to treatment, distribution, and use of alternate water sources.• District-scale projects shall provide to the Director an executed legally Enforceable

Legal Agreement defining the roles and responsibilities of each property owner or entitywith regard to the Alternate Water Source System. The Permittee and each of theSuppliers and Users shall be included in, and signatories to the agreement.

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Required Appendix D for District-scale projects: The agreement shall be recorded and attached as an Appendix to the Engineering Report.

• Identify the Alternate Water Source System’s staffing requirements • Qualifications of the Treatment System Manager responsible for operating the non-

potable treatment system and distribution of treated water • Describe the operations support plan, including plans for near and long-term contractual

services.

Required Appendix A: System Commissioning & Operator Training Manual

4. Alternate Water Sources, Flows, Water Quality, and Characteristics This section describes in detail the source water(s) and collection systems that will supply the project, and any associated issues or challenges. The section must describe the water source, raw water quality, and expected demand flow for the project:

• Identify the hydraulic and contaminant loading rates of the proposed facilities to enable an evaluation of the adequacy of the design.

• Describe the origin of the source water(s) so that the potential for contaminant loading is understood.

• Identify the range of flows that could be observed. Required Table 1: Anticipated Flows

• Provide the raw water quality characteristics (i.e., typical values and range) that will govern the design of the proposed treatment processes (e.g., biochemical oxygen demand for biological processes and suspended solids for filtration). Required Table 2: Raw water quality characteristics

• For foundation drainage, provide initial water quality monitoring results from a certified laboratory

5. Treatment Process This section describes the treatment process and demonstrates that the treatment scheme will meet requirements for water quality and log reductions specific to the project type.

Process or Treatment Train Schematic a.

• Include a schematic of the proposed treatment train.

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Required Figure 2: Treatment Schematic

Individual Component Summary b.Describe each treatment process, addressing design criteria, selected equipment, loading rates, contact times, filtration media, and chemicals used. Required Table 3: System component summary table. Components and instrumentation, including continuous monitoring equipment, should be listed in order through the treatment train. Required Appendix B: Cut sheets should be included in the appendix.

Treatment Process Design Criteria c.Insert any of the following sections as appropriate to provide the design basis for each treatment process, including selected equipment, loading rates, contact times, filtration type, chemicals used, etc. Provide evidence that the proposed treatment scheme will achieve the water quality or treatment objective (e.g., treatment certification, validation report, performance studies, or accepted treatment log reduction value listing). The sample information provided in the following 6 sections is not prescriptive or exhaustive. Specific requirements will be approved by SFDPH based on details provided by the Project Applicant in this Engineering Report.

1. Membrane Filtration All filtration design criteria should be provided including filtration and backwash rates, filter media specifications, the expected turbidities of the filter influent and effluent for microfiltration (MF) and ultrafiltration (UF) membranes seeking pathogen log reduction credits, information should include a description and calculation of how the

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system defines an acceptable PDT value per the EPA's Membrane Filtration Guidance Manual.

2. Membrane BioreactorAll MBR design criteria should be provided including membrane filtration design criteria. For MBRs seeking pathogen log reduction credits, provide evidence of ability to operate MBR within Tier 1 operating boundaries as outlined in Australian Water Recycling Center of Excellence’s Membrane Bioreactor WaterVal Validation Protocol.

3. Ultraviolet Light (UV) DisinfectionProvide a schematic and detailed description of the UV disinfection system. Include the following minimum information:

• Description of UV reactor, number, manufacturer, and type of UV lamps,ballast, modules, banks and electrical facilities.

• Sleeve configuration and characteristics• Monitoring and controls, including the number, location, and function of

monitoring equipment• Required operating conditions (influent turbidity, UV transmittance, UV

intensity, etc)UV reactor validation is required. UV Validation Reports shall be prepared by a licensed engineer. Validation reports must provide evidence of reactor’s ability to reliably and consistently achieve the log reduction value, including information on the required operating conditions and surrogate parameters that require continuous monitoring. The Validation Report shall document results based on validation testing completed utilizing one of the following:

• EPA UV Disinfection Guidance Manual (USEPA 2006),• German UV Devices for the Disinfection for Drinking Water Supply Standard

(DVGW 2006)• NSF/ANSI 55A Standard for UV Water Treatment Systems (NSF/ANSI 2016).

Submitted validation reports must include a letter demonstrating the report has been accepted previously by the California Division of Drinking Water.

4. Chlorine DisinfectionProvide evidence of chlorine dose, including the method for measuring chlorine residualand how contact time will be determined. The EPA has compiled CT tables for severaldisinfection and pathogen types.

CT = Disinfectant residual concentration (C) x Contact Time (T) Contact time is typically demonstrated by conducting a tracer study or “rule of thumb”baffling factors. See the EPA’s Disinfection Profiling and Benchmarking GuidanceManual

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5. Ozone Disinfection Provide evidence of ozone dose, including the method for measuring ozone residual and how contact time will be determined. The EPA has compiled CT tables for several disinfection and pathogen types.

CT = Disinfectant residual concentration (C) x Contact Time (T) Contact time is demonstrated by conducting a tracer study. See the EPA’s Disinfection Profiling and Benchmarking Guidance Manual

6. Additional Sections… as needed

Pathogenic Microorganism Control d.Summarize the proposed log reduction values (LRV) for each treatment process seeking credit and total anticipated LRV of the treatment train. Tabulate the information as well as the total to the log removal targets that apply to the project (see SFDPH Rules and Regulations). Required Table 4: Summary Anticipated LRVs for Pathogen Log Reduction Required Appendix C: LRV Evidence. Evidence supporting the proposed LRV crediting must be included as an appendix to submitted engineering report

Chemical Use, Storage and Delivery e.Describe any chemical storage and feed equipment.

Solids Handling f.Identify the means of handling treatment residuals, if applicable.

Operations and Maintenance planning and manual development g.Describe the process for development of the O&M Manual and updating after the system is permitted.

6. Reliability and Alarm Response This section describes the Alternate Water Source System reliability features:

• Describe how the building will be staffed. • Describe how the equipment used to monitor treatment, operations, and water quality

enables determination of whether the system is working as planned. Include description of any rapid online methods to monitor for surrogate parameters, and how these methods are used to control the treatment operation and flow of water to the use area.

• Describe how alarms will be received and who will be notified, as well as how the monitoring and controls of the system will enable the operator or automatic controls to intervene in the event of the production of off-specification water.

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7. Supplemental Water Supply and Cross Connection Control This section characterizes the make-up water supply that is available to the project and summarizes cross connection and backflow prevention controls.

Make-up Water Supply Description a.Describe the supplemental water supply and availability. Identify the following:

• Make-up water source, quality, quantity, and mode of delivery

Cross Connection and Backflow Prevention Measures b.Cross-connections of alternate water source with the potable system could occur at the conveyance of source water to the treatment, at the treatment facilities, as the non-potable water is distributed to the use area, and where provision is made for a back-up supply when the project is out of service. This section should address:

• The responsible parties for cross-connection control. • Control during construction, including inspection and documentation. • Plumbing system design and proximity to potable water plumbing. • Control of access to the plumbing. • Inspection and documentation of all plumbing construction and modifications. • Backflow prevention devices and assemblies. • Backflow inspections and tests, including frequencies and by whom. • Qualifications required of inspectors and testers. • Training or procedures to advise system operators and users of the threat of, and means

to avoid, cross-connections. • Access for inspections, including consent (i.e., permissions and design considerations).

8. Monitoring and Reporting This section describes the planned monitoring and reporting program, including all monitoring required by the Rules and Regulations.

Continuous Process Monitoring a.Identify the following:

• Type, location, and frequency of continuous monitoring for treatment process efficacy • Method and frequency of continuous equipment/instrument calibration

Required Table 5: Process Monitoring Parameters

Water Quality Sampling and Laboratory Analysis b.Identify the following:

• Sampling and monitoring locations and frequencies (note, sample ports must be shown in Figure 1)

• Sample collection approach and personnel training • Certified laboratory planned for sample analysis (name, address, etc)

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Required Table 6: Performance and Operational Monitoring Requirements

9. Contingency Plan This section describes system features and operational procedures that will be employed in the event of system malfunctions or external emergencies such as loss of power or supplemental supply:

• Describe how spills or overflows from the finished water tank(s), or raw water collection tanks will be detected and handle.

• Describe how treatment skid or other system malfunctions will be detected and the decision process for initiating provision of supplemental water to prevent delivery of inadequately treated water to the end use.

• Describe fail safe features and how water will be provided to end uses in the event of power outages or natural disaster, identify any actions needed to accommodate end users.

• Plan for notifying users and SFDPH as appropriate.

Required Table 7: Problem Conditions, Responses, Actions and Notifications

10. Public Access and Impact This section evaluates possible public exposures during collection, treatment, distribution and use of the alternate water source, and the necessary requirements to protect public health.

General Information a.• Describe the process for customer notification and education regarding the use of the

water. • Describe how the distribution and use area will be maintained and inspected to minimize

the potential for unplanned access to or use of the produced water

Public Exposure b.Below is specific information that must be provided for each of the following proposed uses:

• Irrigation Method of irrigation and description of types of vegetation that will be irrigated Site containment measures Measures to minimize pooling, overspray, and runoff Protection measures for drinking water fountains and designated outdoor eating

areas Proposed irrigation schedule Degree of public exposure and mitigative measures

• Decorative fountains and impoundments Type of activity or use of fountain Degree of public access/exposure and mitigative measures

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Conditions under which the feature may overflow, expected frequency, and direction of drainage

• Cooling Type of cooling system Type of boicide used Type of drift eliminator Potential for employee or public exposure, and mitigative measures

• Dual-Plumbed Systems (typically toilet and urinal flushing) Pipe locations for both non-potable water and potable water systems Type and location of outlets and plumbing fixtures accessible to the public Degree of public exposure and mitigative measures

Food Facilities c.Food facilities are allowed to operate in developments with alternate water source systems, however areas intended for food preparation may not be connected to the system. In this section indicate if the development will include food facilities and if so, describe:

• features located within food facilities which will receive non-potable water • precautions which will be in place to prevent food contact with non-potable water.

Use Area Signage and Markings d.Describe the contents and locations of public signs that will be installed to inform the public of the use of alternate water. Signage should be consistent with Use Area Requirements as described in §60310 of CCR Title 22 and Dual-Plumbed Recycled Water Systems as described in §60313-60316 of CCR Title 22 with the term "Recycled Water" replaced with "Nonpotable Water".

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Required Tables and Figures These are the required tables.

1. Anticipated Flows 2. Anticipated Raw Water Quality Characteristics 3. System Component Capacity Summary 4. Summary Anticipated Pathogen Log Reduction 5. Process Monitoring Requirements 6. Performance and Operational Monitoring Requirements 7. Problem Conditions, Responses, Actions and Notifications

The template provides sample table layouts. Table contents and layout should be modified as necessary for each project.

There are two required figures. 1. Map or Diagram of the Use Sites 2. Treatment Schematic

Required Appendices These are the required Appendices.

A. System Commissioning & Operator Training Manual B. Component Cut Sheets C. Log Reduction Evidence D. Enforceable Legal Agreement (applicable only to district-scale projects)

City and County of San Francisco Edwin M. Lee, Mayor DEPARTMENT OF PUBLIC HEALTH Barbara A. Garcia, MPA, Director of Health ENVIRONMENTAL HEALTH Stephanie K.J. Cushing, MSPH, CHMM, REHS Director of Environmental Health

1390 Market Street, Suite 210 San Francisco, CA 94102

Phone 415-252-3800, Fax 415-252-3875

Non-Potable Engineering Report Template

(July 2017 Revision)

This template is intended to aid Applicants seeking a permit under San Francisco Health Code Article 12C in writing an Alternate Water Source System Engineering Report. Please refer to the detailed Instructions.

Insert CA Registered

Professional Engineer Seal & Signature

Alternate Water Source System Engineering Report

<Insert Responsible Party> <Insert Project Name> <Insert Project Address> Prepared by: <Insert Engineer Name> <Insert Company Name> <Insert Company Address>

Submitted to: San Francisco Department of Public Health Date: <Insert Date>

Non-Potable Engineering Report

Table of Contents

1. General ....................................................................................................................................1 2. Rules and Regulations.............................................................................................................1 3. Responsible Party and Project Participants.............................................................................1 4. Alternate Water Sources, Flows, Water Quality, and Characteristics ....................................2 5. Treatment Process ...................................................................................................................3 6. Reliability ................................................................................................................................6 7. Supplemental Water Supply and Cross Connection Control ..................................................6 8. Monitoring and Reporting.......................................................................................................8 9. Contingency Plan ....................................................................................................................9 10. Public Access and Impact .......................................................................................................9

List of Tables

Table 1: Anticipated Flows ............................................................................................................. 2 Table 2: Raw Water Quality Characteristics .................................................................................. 2 Table 3: System Component Capacity Summary ........................................................................... 3 Table 4: Summary of Anticipated LRVs for Pathogen Reduction ................................................. 5 Table 5: Process Monitoring Requirements .................................................................................... 8 Table 6: Performance and Operating Monitoring Requirements .................................................... 8 Table 7: Problem Conditions, Responses, Actions and Notifications ............................................ 9

List of Figures

Figure 1 Map or Diagram of the Use Sites Figure 2 Treatment Schematic

Appendices

Appendix A - System Commissioning & Operator Training Manual ....................................... 11

Appendix B - Component Cut Sheets ........................................................................................ 12

Appendix C - LRV Evidence ..................................................................................................... 13

Appendix D - Enforceable Legal Agreement (for district scale systems only) ......................... 14

Non-Potable Engineering Report

<Type Project Name, Street Address> 1

1. General Objective of the project: Facility information: ___ Commercial ___ Residential ___ Mixed Location/Address:

Total square footage:

Number of floors:

Number of residents residential units:

Number of residents:

Number of non-resident employees:

Alternate water source(s):

Treated non-potable water end-use(s): Project timeline: Scheduled completion date _________ Anticipated TCO date _______ Design, contracting, staffing and other construction planning milestones:

Figure 1: Vicinity Map and Plan/Layout of the Alternate Water Source System

2. Rules and Regulations Submittal of this Engineering Report is a requirement under applicable San Francisco Codes; final or conditional approval of the report will be obtained prior to seeking a plumbing permit from the Department of Building Inspection.

3. Responsible Party and Project Participants Responsible Party:

Facility Owner(s):

Supplier:

Producer:

User:

Facility Operator(s) or Site Supervisor(s):

Treatment System Manager required education and experience (including minimum license or certification requirements):

System operations support plan and contractual services:

Non-Potable Engineering Report

<Type Project Name, Street Address> 2

4. Alternate Water Sources, Flows, Water Quality, and Characteristics

a. Alternate Water Sources and Flows Source water type(s) and brief description:

General character of the alternate water source(s):

General character of the end use(s) proposed:

Table 1: Anticipated Flows

Design Parameters Value Average Daily Inflow x gpd Average Daily Distribution x gpd Number of Toilets x @ 1 gal/flush Number of Urinals x @ 0.25 gal/flush … etc

b. Source (Raw) Water Quality Summary

Table 2: Anticipated Raw Water Quality Characteristics

Design Characteristic Value Flow Rate x gpm Total Coliform x CFU/100 mL BOD x mg/L TSS x mg/L Turbidity x NTU … etc.

Non-Potable Engineering Report

<Type Project Name, Street Address> 3

5. Treatment Process

a. Process or Treatment Train Schematic

Figure 2: Treatment Schematic

b. Individual Component Descriptions

Table 3 lists system components in the order they are installed in the system

Table 3: System Component Capacity Summary

System Component Function Capacity/Design Value (Units) Notes Vortex filter First flush x gpm Concrete cistern Collected water storage x gallons Pump Brand X Pump to filters x microns, x gpm …etc

Non-Potable Engineering Report

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c. Treatment Process Design Criteria

1. Membrane Filtration Filtration rate: Backwash rate: Filter media specifications: Expected turbidity (design basis) of filter influent prior to the addition of chemicals: Expected turbidity (design basis) of filter effluent:

2. Membrane Bioreactor Filtration rate: Backwash rate: Filter media specifications: Expected turbidity (design basis) of filter influent prior to the addition of chemicals: Expected turbidity (design basis) of filter effluent:

3. Ultraviolet Light (UV) Manufacturer: Number and type of UV lamps: Ballast, modules, banks and electrical facilities: Sleeve configuration and characteristics: Monitoring and controls: Required influent turbidity: Required UV transmittance Required UV intensity

4. Chlorine Disinfection Chlorine dose: Contact time: Method for measuring chlorine residual:

5. Ozone Disinfection Ozone dose: Contact time: Method for measuring ozone residual:

Non-Potable Engineering Report

<Type Project Name, Street Address> 5

d. Pathogenic Microorganism Control

Table 4: Summary of Anticipated Pathogen Log Reduction

Treatment Process Virus Protozoa Bacteria Microfiltration UV Disinfection … etc. TOTAL Log Removal Target

e. Chemical Use, Storage and Delivery Attach a table or describe for each chemical:

• Name and CAS number • Chemical storage and handling facilities • Point of application • Dosages • Method and degree of mixing

f. Solids Handling Description of how the treatment residuals will be handled, if applicable:

g. Operations and Maintenance planning and manual development Process for development: (timeline, responsible party): Anticipated process and timeline for updating after the system is permitted:

Non-Potable Engineering Report

<Type Project Name, Street Address> 6

6. Reliability and Alarm Response

a. System reliability General assessment of system reliability:

b. Occupancy and staffing Description of building staff (e.g. Building Engineer, Property Manager, etc): Hours building will be occupied: Hours building staff will be present on-site:

c. Monitoring, Control, and Alarms Notification method for loss of power from normal power supply: Notification method for process failures: Where the alarm or notification will be received: How the alarm receipt location is staffed: Who will be notified upon receipt of an alarm: Power supply for alarm devices:

7. Supplemental Water Supply and Cross Connection Control

a. Make-up Water Supply Description Description: Quality:

Non-Potable Engineering Report

<Type Project Name, Street Address> 7

Quantity available: Mode of delivery: Anticipated circumstances when make-up water will be utilized (please include details in Section 9):

b. Cross Connection and Backflow Prevention Measures Responsible party for cross-connection control and control of access to plumbing: Alternate water source plumbing design and proximity to potable water plumbing: Backflow prevention device and assemblies: Check the following boxes to indicate that the project has:

1. An Approved air gap (see attachment) _____ YES ______NO

2. Approved backflow devices in other system locations as appropriate _____ YES ______NO

3. Cross connection shutdown test will be scheduled prior to system startup _____ YES ______NO

4. Cross connection test (shutdown, pressure differential, dye, or other accepted method) will be scheduled every four years _____ YES ______NO

Non-Potable Engineering Report

<Type Project Name, Street Address> 8

8. Monitoring and Reporting

a. Continuous Process Monitoring Continuous process monitoring parameters and necessary instrumentation: Method and frequency of continuous equipment/ instrument calibration:

Table 5: Process Monitoring Requirements

Parameters Frequency Reporting Parameters Effluent turbidity Continuous Daily maximum, average Pressure Decay Test Daily Daily pressure decay test results UV Flow rate Continuous Daily maximum, minimum, average UV Influent turbidity Continuous Daily maximum, average Influent UV Transmittance Continuous Daily maximum, minimum, average … etc.

b. Water Quality Sampling and Laboratory Analysis Sample collection approach and personnel training Certified laboratory planned for sample analysis (name, address, etc) Monitoring locations and frequencies

Table 6: Performance and Operational Monitoring Requirements

Water Quality Parameter Value (Units) Frequency Sample Type Chlorine 0.5-2.5 (mg/L) Continuous Continuous meter Total Coliform 2.2 (MPN/100mL) Daily Grab sample

Non-Potable Engineering Report

<Type Project Name, Street Address> 9

Turbidity (after media filter) 5 NTU Continuous Continuous meter … etc

9. Contingency Plan

a. Flow Diversion Conditions that will require immediate diversion:

Table 7: Problem Conditions, Responses, Actions and Notifications Problem Condition Alarm Response Notification

Low chlorine Auto alarm Increase chlorine dose Notify SFDPH

High turbidity Auto alarm Divert until resolved; Check filters, raw water quality, collection surface

Notify SFDPH

…etc

b. Power Failure or Natural Disaster Procedures Procedures in the event of Power Failure or Natural Disaster, including notification of appropriate authorities:

c. Inadequately Treated Water Procedures to be followed if treated water does not meet water quality requirements:

10. Public Access and Impact

a. Public Exposure Description of Use Area Potential Public Contact

Non-Potable Engineering Report

<Type Project Name, Street Address> 10

Strategies to Minimize Public Exposure

b. Food Facilities: Will the development include food facilities? _____ YES ______NO

If Yes: Features located within food facilities which will receive non-potable water: Precautions which will be in place to prevent contact with non-potable water:

c. Use Area Signage and Markings Color and labeling scheme for non-potable piping Sample signage for restroom facilities Sample signage for equipment room and valve access panels Sample signage for irrigation and other use areas Summary list by type including number of signs and location

Non-Potable Engineering Report

11

Appendix A - System Commissioning & Operator Training Manual

System Commissioning & Operator Training Manual Must Be Included as Appendices to

Submitted Engineering Report

Non-Potable Engineering Report

<Type Project Name, Street Address> 12

Appendix B - Component Cut Sheets

Component Cut Sheets Must Be Included as Appendices to Submitted Engineering Report

Non-Potable Engineering Report

<Type Project Name, Street Address> 13

Appendix C - Log Reduction Evidence Evidence Supporting Proposed Log Reduction Crediting Must Be Included for Each Treatment Process Seeking Credit as Appendices to Submitted Engineering Report

Non-Potable Engineering Report

<Type Project Name, Street Address> 14

Appendix D - Enforceable Legal Agreement

(for district scale systems only) District Scale Systems must include a copy of the Enforceable Legal Agreement defining the roles and responsibilities of each property owner or entity with regard to the Alternate Water Source System. The Permittee and each of the Suppliers and Users shall be included in, and signatories to the agreement.