SCADA_Master_Plan

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GNV310133631755(TOC).DOC/081690001 III

SCADA Master Plan Executive Summary ... ES-1 Introduction...ES-1 Recommendations ...ES-1 Existing Facility Control Systems...ES-2 Network Architecture ...ES-2 Collection System Network ...ES-3 WWTP Networks ...ES-3 Operations Data/Control Center and Operations Network...ES-3 Business Network...ES-4 Implementation...ES-4

1 Alternatives Evaluation and Recommendations ... 1-1 1.1 Introduction... 1-1 1.2 Recommendations ... 1-1 1.2.1 Controllers ... 1-1 1.2.2 Collection System Communications Recommendations ... 1-2 1.2.3 WWTP Communications Recommendations ... 1-2 1.2.4 Operations Data Collection Network Communications

Recommendations ... 1-2 1.2.5 Local Operator Interface ... 1-2 1.2.6 Collection System Control Center Recommendation... 1-3 1.2.7 WWTP Control Center Recommendation... 1-3 1.2.8 Operations Data/Control Center Recommendation ... 1-4 1.3 Evaluation... 1-5 1.3.1 Controllers ... 1-5 1.3.2 Collection System Communications Evaluation... 1-9 1.3.3 WWTP Communication Evaluation ... 1-12 1.3.4 Operations Data Network Communication Evaluation ... 1-12 1.3.5 Local Operator Interface Evaluation... 1-12 1.3.6 Collection System Control Center Evaluation... 1-13 1.3.7 WWTP Control Center Evaluation... 1-14

2 Implementation Plan ... 2-1 2.1 Introduction... 2-1 2.2 Recommendations ... 2-1 2.3 Design Criteria ... 2-2 2.4 Standard Pump Station Design Documents ... 2-2 2.5 Procurement ... 2-2 2.5.1 Collection System Request for Proposals Content... 2-2

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CONTENTS, CONTINUED

GNV310133631755(TOC).DOC/081690001 IV

Chapter Page

2.5.2 Collection System RFP Scope of Work ... 2-3 2.5.3 WWTP Request for Proposals Content... 2-3 2.5.4 WWTP RFP Scope of Work ... 2-3

Appendixes

A Block Diagrams

B Design Criteria

C Pump Station Facility Design Criteria D WWTP Facility Design Criteria E Pump Station Design Spreadsheet F WWTP Design Spreadsheet G Standard Loop Specifications

Exhibit

1-1 Controller Comparison...1-5 1-2 Communication Alternatives Comparison ...1-10

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GNV310133631755(TOC).DOC/081690001 V

Acronyms and Abbreviations

API Application Programming Interface

CDMA/FDD Code Division Multiple Access with Frequency Division Duplex

COTS commercial off-the-shelf

C-P City of Baton Rouge/Parish of East Baton Rouge

DCS Distributed Control System

DCS distributed control system

DPW Department of Public Works

ETL Extract, Transform and Load

FES Fixed-End Service

HMI Human Machine Interface

I/O input/output

IP Internet Protocol

KVM Keyboard, Video Mouse

LCD liquid crystal display

LED light emitting diode

mpbs million bits per second

MPLS Multi-Protocol Label Switching MS-ADO Microsoft ActiveX Directory Objects

NAT Network Address Translation

NTG Network Technology Group

PLC programmable logic controller

RFP request for proposal

RSS received signal strength

SCADA Supervisory Control and Data Acquisition

VPN Virtual Private Network

WiMAX Wireless Mobile Access WLAN Wireless Local Area Network

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GNV310133631744(EXSUM).DOC/081640014 ES-1.

SCADA Master Plan Executive Summary

Introduction

The City of Baton Rouge/East Baton Rouge Parish (C-P) Department of Public Works (DPW) requires an integrated Supervisory Control and Data Acquisition (SCADA) system that provides for monitoring and control of each wastewater treatment plant (WWTP) as well as the collection system. The SCADA system will provide management and operational access to data for all facilities to meet the needs of facility operations and maintenance staff, managers, and engineers.

DPW operates a network of more than 400 wastewater collection system pump stations, as well as three primary and five small WWTPs. The number of collection system pump stations continues to grow each year, which increases the need for a SCADA system that will improve operations and maintenance effectiveness and efficiency. The SCADA system is also needed for use in collecting operations and maintenance information and in

responding to emergencies for all facilities.

Recommendations

For the collection system, CH2M HILL recommends creating a SCADA system that utilizes programmable logic controllers (PLCs) at the pump stations for local and remote control and monitoring. CH2M HILL also recommends incorporating the five small WWTPs into the collection system SCADA system. This recommendation would involve construction of a secure Collection System Control Center in a DPW facility supported by a secure wireless communications network, and a connection to the DPW Operations Network. The wireless network is needed to support communications between the control center, pump stations, and mobile laptop workstations used by operations and maintenance staff.

As part of the SCADA Master Plan, CH2M HILL also recommends constructing: • A new control systems at each of the three primary WWTPs to a common network

topology and Distributed Control System (DCS)

• A secure control center at each plant supported by a secure communications network that both provides high-speed communications for both plant DCS and WWTP operation personnel anywhere on the DPW Operations Network

• A secure, central Operations Data/Control Center that provides high-speed communications with plant and collection system control centers

The Operations Data/Control Center will collect, reduce, and archive measurements, alarms and, status information for use by operators, managers, and engineers. The data center will also include an information server that allows managers and engineers to view process graphics and to generate reports using the DCS manufacturer’s visualization application

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SCADA MASTER PLAN EXECUTIVE SUMMARY

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software product installed on their business network workstations. The Operations

Data/Control Center can be utilized for centralized control of the system, if it is so desired, once the collection system and individual WWTP control centers are in place.

Existing Facility Control Systems

DPW has two existing collection system SCADA systems, as well as a stand-alone SCADA system at each of the three primary WWTPs. The two collection system SCADA systems combine to provide monitoring and limited control to 51 of the more than 400 pump stations in the collection system. None of these existing systems are interconnected in any way. Appendix A includes a simplified block diagram for the three primary plants and the newer collection system SCADA systems.

The older of the collection system SCADA systems shares a licensed radio system with public safety, DPW, and other C-P mobile voice users. Originally, this older system provided

monitoring and limited control of 51 pump stations, and has a mix of Aquatrol, Tesco Liquid 4, and Tesco Liquid 5 PLCs. Communications in this system have been unreliable. The system also has fallen into disrepair and is used occasionally for a few of the 51 pump stations

originally served. Spare parts are also no longer available for the Aquatrol PLCs.

The newer collection system SCADA system provides monitoring and limited control of 14 pump stations. The newer system was installed as part of a project to upgrade the existing older collection system SCADA system. The 14 pump stations incorporated into this system are the 13 booster pump stations that did not require replacement control panels, along with Pump Station No. 3, which was added as an emergency repair to bring that station back on-line after a failure. This project has been suspended and is being revisited at this time, as discussed below.

The newer collection system SCADA system uses Verizon digital cellular links to the Internet for communications between the 14 pump stations and the Human Machine Interface (HMI) data and web server at the Network Technology Group’s (NTG’s) Baton Rouge data center. Browser connections over the Internet to the HMI web server are used to support HMI workstations. Additionally, critical alarms are forwarded from the HMI server to pump station supervisors’ cell phones.

The C-P is also in the process of upgrading the radio system to newer technology. It is possible that the new radio system may be able to provide reliable timely communications to at least some pump stations.

Each of the three primary WWTPs has a standalone SCADA system composed of a pair of HMI workstations connected to a network of PLCs over a proprietary PLC copper wireline bus network. All of these systems are out-of-date and are not functioning at this time.

Network Architecture

The proposed SCADA system is composed of the following five components including: 1. Collection System Network

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GNV310133631744(EXSUM).DOC/081640014 ES-3 3. Operations Network

4. Operations Data/Control Center 5. Existing Business Network

Appendix A includes a simplified block diagram for the proposed network, and a discussion of all components follows.

Collection System Network

The collection system SCADA system will be used by collection system operators to monitor and exercise control of collection pump stations in accordance with pump station design criteria. The monitoring and control system includes the following major components: • PLCs at each pump station to provide autonomous local automatic control and to

communicate with servers on the Collection System Process Control Network. • A Collection System Process Control Network housed in an air conditioned

environment with security measures that limit access to HMI servers and network appliances. The process control network collects collection system data and allows mobile collection system operators to monitor and exercise control of collection system pump stations without having to visit each pump station. Additionally, diagnostic information presented to operators can be used to prioritize maintenance activities and to plan preventive maintenance. An example of where control can be used is to pump down certain collection system pump stations in advance of a significant wet weather event to reduce the peak flows that will be experienced at the WWTPs during the wet weather event.

• A wireless communications network to provide reliable communications between the pump stations and the process control network. It is recommended that wireless communications be accomplished by a digital cellular network at this time.

WWTP Networks

Each WWTP Process Control Network will be used by WWTP operators to monitor and control WWTP process equipment in accordance with operations procedures. WWTP networks include the following major components:

• A WWTP Process Control Network housed in an air conditioned environment at each WWTP with security measures that limit access to network appliances, DCS servers, and workstation computers. The process control network connects DCS system components, collects WWTP data and allows WWTP operators to monitor and control WWTP process equipment. Additionally, diagnostic information presented to operators can be used to prioritize maintenance activities and to plan preventive maintenance.

• A fiber optic Fast Ethernet local area network (LAN) to provide reliable communications between DCS controllers and the process control network.

Operations Data/Control Center and Operations Network

An Operations Data/Control Center is required to provide central collection, storage, and processing of operations data from WWTPs and the collection system. The Operations

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Data/Control Center’s applications provide easy access to data for managers and engineers to support a number of activities, including regulatory reporting, management oversight, collection system and treatment capacity and quality analysis, and improvements planning. In the future, centralized control of the collection system and WWTPs can be accomplished at the Operations Data/Control Center.

CH2M HILL recommends locating the Operations Data/Control Center on a separate network from both the Business Network and the Process Control Networks to provide isolation between the networks. By isolating the networks, the availability and integrity of both the Operations Data Center and the Process Control Networks are improved.

The Operations Network provides reliable communications between each of the four Process Control Networks and the Operations Data Center. This network will be

implemented using leased lines and digital data services provided by the local telephone company. The firewall in the Operations Data Center controls traffic between the three connected networks and serves to “protect” the Operations Network, while still allowing for future centralized control at the Operations Data/Control Center.

Users connected to the Operations Network have credentials-limited remote monitoring and control access to any of the three WWTPs and the Collection System. Credential limitations are used to manage access to prevent unauthorized persons from adjusting parameters, such as chemical flows at a particular WWTP. Centralized control of the entire system can be accomplished via the Operations Network, if desired in the future.

Users connected to the Business Network are subject to the same credential limitations and must also use a virtual private network (VPN) connection through the firewall for direct monitoring and control. However, operations information is available to Business Network users directly from servers in the Operations Data Center.

Business Network

The Business Network is an existing network that supports utility management and engineering activities. The DCS manufacturer’s visualization application software product installed on existing Business Network user workstations will provide access to the

operations information stored in the Operations Data Center and provide easy access to operations data for managers and engineers, supporting a number of activities, including regulatory reporting, management oversight, collection and treatment capacity and quality analysis, and improvements planning.

Implementation

In order to implement the recommendations, a request for proposal (RFP) process is

recommended. A total of two RFPs are recommended: one for the collection system and one for all three major WWTPs.

The collection system RFP would be used to select a collection system provider that would build the Collection System Control Center and the communications network connections, thereby completing the Collection System SCADA system and encompassing the design, installation, and maintenance of the collection system SCADA system for 5-years. Design

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criteria included with the RFP, and, therefore, included in price proposals received, will require that the communications network and control center delivered be capable of accepting controllers for the existing pump stations that are not to be replaced in the SSO program. The cost proposal portion of the RFP will only include pump station controllers for the pump stations that are being replaced as part of the SSO program, since these will be the only pump stations defined at the time that the RFP is written. Costs for purchasing, installation, and incorporation of future pump station controllers (including those at existing stations that are not included in the SSO program) can be added to the contract at the time they are needed. The RFP will be written for a 5-year period, with the option for renewal.

A separate WWTP RFP will be written based on a specific DCS that encompasses the design, installation, and maintenance of the WWTP SCADA system for all three primary WWTPs. Proposals received in response to this RFP, including costs, will include all elements and allow the provider to be selected based on a combination of performance and cost information. The RFP will be written for a five year period, with the option for renewal. Continuing and long-term support of the SCADA system is recommended to promote accurate, responsive, and reliable SCADA system performance and to maintain a viable SCADA system as technology continues to rapidly evolve. Including periodic major upgrades, migration to newer hardware and software, as well as routine preventive maintenance and software update installation work in support contracts is recommended.

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CHAPTER 1

Alternatives Evaluation and Recommendations

1.1 Introduction

Several alternatives were evaluated for the entire Supervisory Control and Data Acquisition (SCADA) system. Evaluations included controllers, communications, and control centers for the collection system, wastewater treatment plants (WWTPs), and for the overall SCADA system as follows.

• A total of eight programmable logic controllers (PLCs) from five manufacturers and one Distributed Control System (DCS) were evaluated for pump stations and WWTPs. The evaluation that follows focuses on differences between evaluated options with a discussion of common features.

• A total of nine different communication alternatives were considered for the collection system, WWTPs, and the DPW operations network. The evaluation discussed in the following sections outlines several options for communications that were considered for this SCADA Master Plan.

• Local operator interfaces were also evaluated. Local operator interfaces allow operations and maintenance staff to view process variables, as well as view and adjust setpoints and other adjustable parameters at either the pump station or at selected locations within the WWTP.

The pump station control center will house the computer servers that collect information from pump station PLCs, advise mobile operations and maintenance staff of problems requiring attention, transmit data to historian servers, and support graphical, interactive HMI displays on mobile laptop workstations.

The WWTP control centers will house the DCS computer servers and workstation computers that collect information from DCS controllers. The control centers will also advise mobile operations and maintenance staff of problems requiring attention, transmit data to historian servers, and support graphical, interactive DCS workstation displays. An Operations Data/Control Center will be utilized to house historical database servers that will collect operations data from treatment facilities and the collection system and place it in a database. This operations data/control center can also be utilized in the future if centralized control of the collection system and WWTPs is desired. The database servers should be housed in a separate room of the operations data/control center for security purposes.

1.2 Recommendations

1.2.1 Controllers

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CHAPTER 1. ALTERNATIVES EVALUATION AND RECOMMENDATIONS

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1. Continued use of the Tesco L2000 PLC that is currently in use at the pump stations. 2. Installation of the Emerson Ovation DCS at each of the three primary WWTPs. The method for evaluating the controllers follows.

1.2.2 Collection System Communications Recommendations

Assuming the ownership and upgrading of the Verizon network service contract and

conversion to Ethernet using Internet Protocol (IP) is recommended. Recommended Verizon network improvements include conversion to a Fixed-End Service (FES), Code Division Multiple Access with Frequency Division Duplex (CDMA/FDD) radio technology, and Ethernet digital cellular interfaces capable of providing Network Address Translation (NAT) and supporting Virtual Private Network (VPN) connections.

The Ethernet interface is ubiquitous, very flexible, supports routing over networks, and can use combinations of a broad range of communications alternatives. Assuming ownership and upgrading of the Verizon network service contract will ease obtaining the benefits of state government rates.

Other advantages of the Ethernet interface include scalability, flexibility, and life-cycle cost effectiveness. Scalability will allow the network to grow as required to incorporate future anticipated pump stations and, if desired, integrate with the WWTP network. Flexibility will reduce the risk of wholesale network replacement, allow the communication network to adapt to technological improvements, and allow DPW to use several communication

technologies in combination or to migrate the network from one communication technology to others. Life-cycle cost effectiveness can be achieved by including life-cycle costs when selecting communications alternatives.

1.2.3 WWTP Communications Recommendations

As shown on the block diagram in Appendix A, the recommended network topology for each primary WWTP is a redundant fiber optic Ethernet star using Internet Protocol (IP) that provides continued operation after failure of a single link or switch. This method of communication is the only method available at this time for the recommended Emerson Ovation DCS.

1.2.4 Operations Data Collection Network Communications Recommendations

As shown on the block diagram in Appendix A, the recommended operations data

collection network service is digital wireline supporting IP protocol. The planned initial data rate is 1.5 million bits per second (Mbps) using a service such as Multi-Protocol Label

Switching (MPLS). Advantages of this interface include scalability, flexibility, and life-cycle cost effectiveness.

1.2.5 Local Operator Interface

For pump stations, two local operator interfaces were considered: liquid crystal display (LCD) and light emitting diode (LED). Because DPW has experienced reliability problems with the LCD displays, and the LED type displays provide an adequate operator interface, the LED type operator interface is recommended for the pump stations. The small Tesco LED operator interface requires no configuration and is well suited to use with the recommended Tesco L2000 pump station controller.

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For the WWTPs, panel-mounted, industrially-hardened, corrosion-resistant, touch-screen LCD display terminals, which can run MS Windows, are recommended. These local operator interfaces would be located at each DCS controller.

1.2.6 Collection System Control Center Recommendation

Housing the control center in an environmentally-controlled space with physical access restricted and monitored is recommended. The physical location is only limited by the requirement that the control center have reliable power and access to reliable digital data telephone service.

Adding mobile laptop computer workstations to the Verizon digital wireless network is recommended to provide mobile operators with full human-machine interface (HMI) access to monitor collection system performance, investigate alarms, and make trouble response decisions. Like the pump stations, the laptops would use the Verizon private network and would not have Internet access. The same level of access would also be available any workstation on the operations data collection network where the HMI client is installed. DPW is currently using Indusoft HMI application for process monitoring and control. Continued use of Indusoft with upgrades to extend alarm messaging capabilities is recommended.

As shown in the block diagram in Appendix A, redundant servers are recommended. Expanding existing alarm messaging capabilities to provide voice notification to on-duty or on-call operators and maintenance staff members is recommended.

A separate historical data collection server was included at the Network Technology Group (NTG) data center in existing pump station SCADA system. Upgrading the existing server and adding a DCS workstation to collect and transport collection system historical data to the operations data/control center is recommended. The upgrades will allow the data/ control center to support the mobile laptops and to ease business network access and use.

1.2.7 WWTP Control Center Recommendation

As shown in the block diagram in Appendix A, providing separate control centers and control rooms at each of the primary WWTPs is recommended. Locating the control center in an environmentally-controlled space with physical access restricted and monitored is also recommended. Control centers will house workstation and server computers. A separate environmentally-controlled control room housing workstation operator interfaces is also recommended. Each operator interface will include a keyboard, video display, mouse and speakers connected to the workstation computer in the control center using a single

Category 6 cable and a pair of Keyboard, Video Mouse (KVM) extenders. Separation of the operator interface from the workstation computer is recommended to limit access to

computer media drives and communications ports. The control center and control room for each of the three WWTP should be located in close proximity to each other on the WWTP site, and in a location with reliable power and access to reliable digital data wireline telephone service.

Multiple workstations and redundant servers are recommended at each WWTP control center to improve reliability and ease upgrades and patches. Providing alarm messaging

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capabilities to provide voice notification to roving operations and maintenance staff of alarms is also recommended to reduce the need for requiring personnel to be physically located in each WWTP control center.

Combining treatment plant historical data collection with collection system historical data at a common Operations Data/Control Center is recommended to ease maintenance, access and use.

1.2.8 Operations Data/Control Center Recommendation

As shown in the block diagram in Appendix A, providing separate central data center with provisions for a future central control center is recommended. Locating the data center in an environmentally-controlled space with physical access restricted and monitored is also recommended. The data center will house historical database and information servers, as well as future control center workstations. A separate future environmentally-controlled central control center housing workstation operator interfaces is also recommended. Each operator interface will include a keyboard, video display, mouse and speakers connected to the workstation computer in the data center using a single Category 6 cable and a pair of KVM extenders. Separation of the operator interface from the workstation computer is recommended to limit access to computer media drives and communications ports. The control center and control room should be located in close proximity to each other, and in a location with reliable power and access to reliable digital data wireline telephone service At WWTPs, historian redundant scanners running on two of the DCS workstations are recommended to collect historical data and transport it to the historian. Adding a single DCS workstation at the collection system control center is recommended to collect and transfer collection system historical data to the historian. Currently, the DCS applications cannot support the mobile laptops recommended for the pump station monitoring and control. In the future, it may be possible to phase out the Indusoft software and use DCS applications to support the mobile laptops. However, at this time, maintaining the Indusoft servers for support of the wireless laptop is recommended.

Historical data can be transferred from the historical database to the existing DPW Oracle database. The method and complexity of data transfer between the historical database and the Oracle database depends on the volume of data being transferred. There are two possible methods of transferring data: Extract, Transform and Load (ETL) tools or custom programming. Custom programming would either use either the historian’s Application Programming Interface (API) and the Microsoft ActiveX Directory Objects (MS-ADO). ETL tools can be expensive, but should be evaluated further during implementation after a decision has been reached on the volume of data to be transferred.

As shown in the block diagram in Appendix A, locating the operations data/control center on a separate network with controlled access from both the DPW Business Network and the collection system and WWTP process control networks is recommended to provide practical but effective isolation between the operations network and the business network, thereby improving the availability and integrity of both the Operations Data/Control Center and the process control networks.

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1.3 Evaluation

1.3.1 Controllers

Table 1-1 shows the comparison of the eight controllers that were evaluated as part of this SCADA Master Plan. As shown in Table 1-1, three of the PLC manufacturers (Allen-Bradley, Modicon and Siemens) share a large portion of the United States PLC market, while two other manufacturers (Tesco and Emerson) have a much smaller market share. The Tesco L2000 controller is included because it is well suited for pump station applications and because it is currently being used successfully by DPW. Two Emerson controllers, the Bristol Babcock ControlWave PLC and the Ovation DCS, are also included because

ControlWave PLCs are well suited as pump station controllers, and the Ovation DCS is well suited to treatment plant control.

All of the controller products evaluated except for the Tesco L2000, Emerson ControlWave PLC and Emerson Ovation DCS are commercial off-the-shelf (COTS) products. The Tesco and Emerson products are only available from the manufacturer and are more sensitive to manufacturer’s decisions on pricing increases and availability limitations than the other products, due to the dependence of the entire SCADA system on these products. However, Tesco and Emerson, as well as their products being evaluated here, have been available and supported for several decades, and they both have built up loyal customer bases. There is no reason to suspect that any of that will change, so the recommendation to continue using the Tesco L2000 for pump stations and to adopt the Emerson Ovation DCS for WWTPs was not affected by the possibility of limited availability or price increases.

TABLE 1-1

Controller Comparison

Controller Environmental

Monitoring

& Control Communications

Operator Interface +/- Allen-Bradley Compact-Logix with PanelViewPlus 400 Operator Interface Suitable for industrial environment 140 degrees F Full-featured Supports 4 of the IEC61131-3 languages Modular

Ethernet & Async. Serial 3rd party MODBUS modules avail. Native CIP protocol Wide selection available Can significantly increase cost High cost (-)

Large Market Share (+) Redundancy only with ControlLogix PAC CPUs (-)

Separate terminal blocks (+)

Not hot swappable modules (-) Allen-Bradley ControlLogix Suitable for industrial environment 140 degrees F Full-featured Supports 4 of the IEC61131-3 languages Modular

Ethernet & Async. Serial 3rd party MODBUS modules avail. Native CIP protocol Graphical HMI RSView Can use 3rd party HMI’s High Cost (-)

Large Market Share (+) Redundancy (+) Hot swappable modules (+) Separate terminal blocks (+)

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CHAPTER 1. ALTERNATIVES EVALUATION AND RECOMMENDATIONS GNV310133631745(CH1).DOC/081640015 1-6 TABLE 1-1 Controller Comparison Controller Environmental Monitoring

Operator Interface +/- Emerson Control Wave with Maple Systems, INC graphic operator interface Suitable for industrial environment 158 degrees F ControlWave Designer is fully IEC 61131-3 compliant Ethernet BSAP Protocol Modbus, DFI, CIP DNP3 Maple Systems 6 options, non-graphical Medium cost (+/-) Small market share (-) Redudancy, but CPUs in the same rack (+/-) Hot swappable modules (+) Separate terminal blocks (+) Emerson Ovation Suitable for industrial environment 50 degrees C (112 F) IEC 61131-3 Compliant Ovation Network Ethernet Modbus DNP3 Proprietary Plant wide graphical interface High cost (-)

Small market share (-) Redundancy (+) Hot swappable modules (+) Separate terminal blocks (+)

Windows or Unix based system available (+) Modicon M340 with Magelis XBTGT11 Operator Interface Suitable for industrial environment 140 degrees F Full-featured Modular Full IEC 61131-3 capability

Ethernet & Async. Serial Native MODBUS & MODBUS TCP CIP module planned Wide selection available Can significantly increase cost Medium cost (-) Large market share (-) Only with Quantum CPUs (-)

Not hot swappable modules (-) Separate terminal blocks (+) Modicon Quantum Suitable for industrial environment 140 degrees F Conforms to IEC 61131-3 Full-featured Modular

Ethernet & Async. Serial Native MODBUS & MODBUS TCP Modbus plus Graphical HMI Citect Can use 3rd party HMI’s High cost (-)

Large market share (+) Redundancy (+) Hot swappable modules (+) Separate terminal blocks (+) Siemens S7-300 Suitable for industrial environment 140 degrees F Full-featured Modular Full IEC 61131-3 capability

Ethernet & Async. Serial PROFIBUS PROFINET Modbus RTU function block Wide selection available Graphical HMI WinCC Can use 3rd party HMI’s Medium cost (+/-) Large market share (+) Redundancy only with S7-400 Series (-) Not hot swappable modules (-) Separate terminal blocks (+)

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CHAPTER 1. ALTERNATIVES EVALUATION AND RECOMMENDATIONS GNV310133631745(CH1).DOC/081640015 1-7 TABLE 1-1 Controller Comparison Controller Environmental Monitoring

Operator

Interface +/-

Tesco L2000 Suitable for industrial environment 200 degrees F Full-featured Using IEC 61131-3 reduces capability Tailored for application Modular

Dual Ethernet & Async Serial Native MODBUS RTU Two sizes of Tesco Operator Interface Available Non-graphical May be more cryptic Wide selection of 3rd party also available Medium cost (+/-) Small market share (-) Not redundant (-) Hot swappable modules (+) Separate terminal blocks (+)

In the case that the Tesco L2000 were to be subject to pricing increases, lack of availability, or obsolescence, the C-P can simply choose another, similar product with an Ethernet interface and acceptable HMI interface software as a replacement for future and failed units. In the case of the Ovation DCS, which is a vertically-integrated solution that encompasses the controller, operator interface, and historian functions, replacement of the entire system would be required if pricing increases, lack of availability, or obsolescence forced the C-P to select another controller for the WWTPs.

1.3.1.1 Collection System Controllers

Seven of the eight controllers listed in Table 1-1 are suitable for use as controllers at collection system pump stations. A mix of all seven suitable controllers could be used. However, to ease support, reduce spare parts, and reduce HMI application complexity, standardizing on a single manufacturer and model PLC is recommended.

The Allen Bradley ControlLogix and Modicon Quantum PLCs are larger and more expensive. The greater expense is unlikely to be justified for any but the largest pump station application. Eliminating these leaves the Allend Bradley CompactLogix, Bristol Babbcock ControlWave, Modicon M340, Siemens S7-300, and Tesco L2000.

Of these, all but the CompactLogix and L2000 provide full IEC 61131-3 compliance with all five programming languages. IEC 61131-3 programming languages can produce more intuitive program documentation that is easier to understand and troubleshoot. Both the CompactLogix and L2000 provide some degree of limited IEC 61131-3 support.

All five PLCs can use MODBUS RTU protocol. Maintaining MODBUS RTU capability may be useful if asynchronous serial communications are used in the future.

Third party modules are required to use MODBUS with the CompactLogix. Using

MODBUS protocol with the L2000 does eliminate some of the communication features, such as peer communications, available with Tesco’s Data Express protocol. However, none of the eliminated features are expected to be used.

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Of the controllers considered for pump stations, CompactLogix, ControlWave, M340, and L2000, only the ControlWave and L2000 have hot swappable input and output (I/O) modules. This feature is useful because it eases repair. However, care is still required

because all outputs are frozen during module replacement and all I/O on the module with a failed point will be disconnected during replacement.

As stated above, continued use of the Tesco L2000 controllers is recommended at the pump stations. The advantages of using the Tesco L2000 include:

• Tesco PLCs are specifically intended for use in remote water and wastewater pump stations and for communications over unreliable communications networks. Important features include built in lightning protection; unreliable media communications features; a maximum operating temperature of 200 degrees F; an adequate, easy-to-configure operator interface; and data recovery capability.

• DPW has standardized on the modular Tesco L2000 series of controllers for collection system pump stations.

• Tesco’s support services can and have been leveraged by DPW to supplement their own staff and available local support, reducing the need to attract and retain additional in-house support staff. DPW is satisfied with Tesco support received to date.

• Tesco offers two operator interfaces that are tailored to pump station operation and support both operations and tuning functions, eliminating the need for operations and maintenance staff to use programmers or learn the programming language.

• The disadvantages of using the Tesco L2000 include:

• Tesco is a relatively small manufacturer with a small share of a niche market. Reliance on small niche firms is generally considered to increase business risk.

• Having a small user-base reduces the availability of technical support services available locally, which can reduce support reliability and increase support costs.

• Having Tesco as a single-source-of-supply eliminates the ability to easily obtain competitive pricing for comparison. However, as long as common process and

communications interfaces are used, DPW could migrate to another PLC manufacturer at some point in the future, if necessary.

• Tesco’s implementation of IEC 61131-3 programming requires a third party application, has not been used by DPW and may be difficult to implement. Tesco’s default script or instruction list programming technique is currently used, but utilizing the lists increases the time required to program and troubleshoot programs.

1.3.1.2 WWTP Controllers

Four of the eight controllers listed in Table 1-1 are suitable for use as WWTP controllers. Of those four, all but the Ovation DCS are independent controllers, or PLCs, that are suitable for use with third party HMI applications. The Ovation DCS is a complete,

vertically-integrated, system that includes the controllers, communications network protocol, the HMI and the historian application. Ovation systems are able to interface to other systems and PLCs, but they are designed to work as a complete system.

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The other three controllers suitable for use in treatment plants are the Allen Bradley ControlLogix, Modicon Quantum, and Siemens S7-300 PLCs. Though not recommended, a mix of all three of these controllers could be used in a single plant supported by a single HMI application. However, to ease support, reduce spare parts, and reduce Human Machine Interface (HMI) application complexity, standardizing on a single manufacturer and model PLC is recommended.

All but the ControlLogix provide full IEC 61131-3 compliance with all 5 programming languages. IEC 61131-3 programming languages can produce more intuitive program documentation that is easier to understand and troubleshoot. ControlLogix provides limited IEC 61131-3 support.

As stated above, the Emerson Ovation DCS is recommended for use as the WWTP controller. Using the Emerson Ovation DCS has the following advantages:

• Having a system composed of products from a single manufacturer will simplify trouble shooting, modifications, and upgrades by eliminating the need to coordinate among a number of manufacturers.

• DCSs provide a high level of redundancy that significantly improves reliability. This level of redundancy is not easily implemented with PLC based systems.

• A common spare parts warehouse can be used for all three treatment plants and the number of spare parts required is reduced because all three plants use the same DCS. • LAN configurations are based on the DCS manufacturer standards reducing the need

for local network configuration experts.

• DCS controller configurations are generally more intuitive and straight forward than PLC configurations. Also, DCS configuration trouble shooting and modification by others than the original configuration author is usually easier than it is for PLC configurations.

The disadvantages of this approach include:

• The request for proposal (RFP) process required to select a DCS supplier complicates the Design-Bid-Construct delivery process that is normally utilized by the C-P.

• DCSs are not as widely used in treatment plants as PLCs, which will limit the availability of local support alternatives.

• DCSs and most DCS repair parts are only available from the DCS manufacturer and are subject to the manufacturer’s decisions on pricing and availability.

1.3.2 Collection System Communications Evaluation

All of the nine alternatives listed in Table 1-2 are capable of using the recommended collection system pump station interface and satisfying pump station requirements. However, the two fiber and the digital wireline alternatives are not considered further in this evaluation because they are not likely to be cost effective over the life cycle of the equipment, leaving the five wireless alternatives as well as analog wireline.

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One major consideration in selecting a communications alternative for distributed facilities is deciding who will own the communications infrastructure. C-P-owned (private)

alternatives tend to berequire longer to deploy, have higher capital costs, and have lower recurring costs, though each alternative must be evaluated on its own merits.

The opposite is true for provider-owned alternatives, which offer a pay-as-you-go model, allowing them to be quickly deployed or expanded for relatively low capital cost budgets. However, the monthly service fees (not normally required for private networks) are a recurring cost that must be paid monthly for as long as the service is used.

If the C-P owns the network, it also has better control over all aspects of the communication network, which can improve service and reliability. However, being in control is a double-edged sword because the owner is responsible for all support, maintenance, upgrade, repair, and disaster recovery. Permitting can also delay deployment and increase the costs for C-P-owned alternatives.

Private point-to-multi-point radio, either licensed or unlicensed, may be life-cycle cost effective for some portion of the pump station network. However, private radio networks providing adequate performance and reliability are not expected to be life-cycle cost effective for large portions of the pump station network. Selection of a frequency, radio path measurements and analysis, as well as preparations of a cost estimate, would be required to better evaluate this alternative.

The C-P public safety mobile radio network is being upgraded. The upgraded network may be able to provide life-cycle cost effective communications for some pump stations once it becomes available. However, historical issues with latency and availability during civil emergencies would need to be evaluated before widespread use could be recommended.

TABLE 1-2

Communication Alternatives Comparison

Alternative Owner Cost Hurdles +/-

Private Point-to-Multi-point Radio (Licensed or Unlicensed)

City or DPW Capital - High Annual - Low

Permitting Licensing Line-of-Site

In control of own destiny (+) Low to medium data rate (-) Link reliability (-)

Disaster recovery (-) Scalability issues (-) City Radio

Network

City Information not

available at this time.

Permitting Line-of-Site

Information not available at this time.

Digital Cellular Provider Capital - Low Annual - Medium Provider coordination Latency Moving target Evolving technology Good scalability (+)

Low to medium data rate (+) Disaster recovery probably better than private (+) No SLA (-)

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TABLE 1-2

Communication Alternatives Comparison

Alternative Owner Cost Hurdles +/-

WLAN 802.11n/s City, DPW or Provider City/DPW owns: Capital – High Annual – Low Provider owns: Capital – Low Annual – High City/DPW owns: Permitting Network design Provider owns: Same as for Digital Cellular

Good scalability (+)

Medium to high data rate (+) SLA if Provider owned (+) Disaster recovery depend on implementation (+/-)

WiMAX 802.16e Provider Capital – Low Annual – High

Same as for Digital Cellular

Probably Same as for Digital Cellular

Dark Fiber City, DPW or Provider City/DPW owns: Capital – V High Annual – Low Provider owns: Capital – Low Annual – High

City owns: Right-of-way

Provider owns: Coordination

Good Scalability (+) High data rate (+) Good reliability (+)

Other Fiber Shared with other public agencies or provider Capital - Low Annual - Variable Coordination with users or provider Throughput Privacy

High data rate (+) Good reliability (+) Depends on owner, SLA, maintenance level, and degree of over subscription (+/-)

Digital Wireline Provider Capital - Low Annual - High

Provider coordination Moving target Evolving technology

Good scalability (+)

Medium to high data rate (+) Disaster recovery (+) No SLA for DSL (-) Analog Wireline Provider Capital - Low

Annual - Low

May not be available Dated technology

Low data rate (-) Reliability (-) Scalability (-)

The analog wireline alternative, though once common, is no longer considered viable

because of reliability and support limitations. Neither Wireless Mobile Access (WiMAX) nor Wireless Local Area Network (WLAN) is yet available for pump stations. As either WiMAX or WLAN become available, they should be considered as expansion and migration

alternatives.

Therefore, improvement, expansion, and assuming ownership of the existing Verizon digital cellular communication network is recommended. Digital cellular is becoming more

reliable, and technology improvements are improving telemetry performance. Also, digital cellular coverage is expected to be sufficient to provide coverage on most, if not all pump stations. Assuming ownership of the Verizon network service contract will ease obtaining the benefits of state government rates.

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As stated above, recommended improvements include conversion to a Fixed-End Service (FES), Code Division Multiple Access with Frequency Division Duplex (CDMA/FDD) radio technology, and Ethernet digital cellular interfaces capable of providing Network Address Translation (NAT) and supporting Virtual Private Network (VPN) connections.

Conversion to FES will move the pump station communications network off the Internet and maintain it on Verizon’s private network. This will drastically reduce the potential downside effects of the Internet thereby improving reliability and reducing malicious traffic. Additionally, replacing existing antennas with higher gain antennas and, when required, adding antenna amplifiers is recommended. Choosing replacement antennas inside the pump station that maximize the received signal strength (RSS) is also recommended. Conversion to CDMA/FDD should improve reliability, especially during conditions (such as storms) that might reduce signal levels. CDMA/FDD also offers drastically higher channel capacity when compared to the current CDMA technology that it replaces. The higher channel capacity is not expected to improve pump station communications performance. Antenna replacement and relocation should also improve signal levels.

1.3.3 WWTP Communication Evaluation

For the WWTPs, the redundant star topology is the only communications alternative supported by the selected DCS. Although it is somewhat dated, advantages of this interface include scalability and reliability. Scalability will allow the network to grow as required to accommodate plant expansions and upgrades. The redundant switches and media

employed in this network will improve reliability by continuing to operate after failure of any single communications network component.

The only other topology considered was a fiber optic Fast or Gigabit Ethernet loop at each plant. There may also be plant applications where a wireless LAN (WLAN) alternative is adequate and cost effective. However, reliability, capacity and security issues will need to be addressed on a case-by-case basis.

1.3.4 Operations Data Network Communication Evaluation

Five alternatives (WLAN, WiMAX, Dark Fiber, Other Fiber and Digital Wireline) compared in Table 1-2 are all capable satisfying data collection network requirements. Of these, only the digital wireline alternative is currently available. Evaluating other alternatives as they become available is recommended. When an available alternative is found to be superior to digital wireline, migration to that alternative can begin.

1.3.5 Local Operator Interface Evaluation

Available operator interfaces generally fall into two categories. The most basic operator interfaces provide one or more lines of LED display and a keyboard for selecting variables and keys for modifying adjustable parameters. The other type of operator interface has a graphic Liquid Crystal Display (LCD) and either a keyboard or a touch-screen interface. The LCD display types are more flexible, provide a more comprehensive interface and have more complex configurations. The LED types are less flexible, less comprehensive, and require less complex configurations.

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As stated above, the LED type of operator interface is recommended for the pump stations, while the LCD type (with a touch-screen display) is recommended for the WWTPs. For WWTPs, care must be taken to select a location and display terminal that will provide good display visibility when installed in areas with high ambient light levels, and acceptable service life. Locating the local operator interfaces in the doors of the DCS controller cabinets is expected to provide an acceptable environment and good visibility.

1.3.6 Collection System Control Center Evaluation

The control center commissioned in the existing pump station SCADA system is located at the NTG Tier IV data center in Baton Rouge. Tier IV data centers offer 99.995% reliability. The control center could be maintained at the NTG facility or relocated to a DPW facility. Relocation is likely to significantly reduce reliability; but is likely to ease access and eliminate recurring data center costs. As stated above, relocating the control center to a DPW facility is recommended.

The InduSoft HMI application also added in the existing SCADA system has a very small market share when compared to major competitors, such as GE Intellution iFix, Invensys Wonderware Intouch, Citech and Rockwell RSViews. Also, CH2M HILL does not have any direct experience with InduSoft. However, InduSoft capabilities have been reviewed and water and wastewater users found have been interviewed. No significant technical shortcomings were found with InduSoft. Therefore, the continued use of InduSoft is recommended.

• Enhancing alarm messaging capabilities will reduce the time that operators must spend in front of a computer. Some alarm messaging is provided by the existing collection system HMI servers. However, third-party products are available that work with most major HMI applications that enhance alarm messaging as follows:

• Alarm voice and text messaging for selected critical alarms to field staff.

• A flexible central interface for assigning alarm groups to specific field staff personnel depending on staff’s current location and assignment.

• A flexible communication interface that can be reconfigured to use the best available delivery alternative.

Replacement of the InduSoft HMI application with a DCS workstation was also evaluated. However, current products available with the recommended DCS do not effectively support the mobile laptops needed by the collection system operations and maintenance staff, so it is recommended to continue to use the InduSoft HMI application at this time.

A separate historical data collection server was included at the NTG data center in the existing SCADA system. Upgrading the existing server to bring it up to current product versions will support mobile laptop graphic displays and historical data access. Adding a DCS workstation to collect and transport collection system historical data to a common data center will provide comprehensive historical data access for operations and maintenance staff as well as planning and engineering staff..

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1.3.7 WWTP Control Center Evaluation

Locating workstation computers in each WWTP control center along with the servers will limit access to media drives and communications ports, thereby reducing the opportunity to mis-use the DCS servers and workstations. The workstations can be connected to keyboards, video displays, mice and speakers several hundred feet away by a single cable using KVM extenders.

Alarm messaging capabilities reduce the need for an operator to be in front of a computer. Third-party products such as Win911 are supported by Ovation and provide for alarm messaging as follows:

• Alarm text and voice messaging for selected critical alarms to roving or on-call operators.

• A flexible central interface for assigning alarm groups to specific field staff personnel depending on staff’s current location and assignment.

• A flexible communication interface that can be reconfigured to use the best available delivery alternative.

1.3.7.1 Operations Data/Control Center Evaluation

There are two options for collecting and transferring collection system data from the

InduSoft servers (for the collection system SCADA) to the historical database. One option is to use the InduSoft server to provide an interface to the DCS client on the Engineering workstation at the Collection System Control Center. A historian scanner running on the workstation would collect historical data and transport it to the Ovation historian. The other option is to interface the Engineering workstation communications in parallel with Indusoft HMI and with the PLC using MODBUS protocol. A disadvantage to the second option is the doubling of wireless network traffic. Also, the recommended DCS doesn’t currently have a workstation application that is well suited for deployment on the digital cellular network since the currently available browser product doesn’t support alarm handling. However, in the future it may be possible to phase out the Indusoft servers and to support the mobile laptops on the Digital Cellular Network via the DCS servers. While the current recommendation is for Indusoft to be maintained, the recommendation should be reevaluated as technology advances and the cost of bandwidth becomes more cost effective. As stated above, it is recommended that the operations data/control center be located on a separate network with controlled access from both the DPW Business Network and the collection system and WWTP process control networks to provide isolation between the networks This separation allows for future centralized control at the operations

data/control center, while also protecting the collection system and WWTP networks from possible mis-use via the Business Network.

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CHAPTER 2

Implementation Plan

2.1 Introduction

The implementation plan describes how the SCADA system will be designed, delivered, and supported. The plan is broken down into two modules, collection system and WWTPs, because the two are expected to be implemented separately.

2.2 Recommendations

CH2M HILL recommends using an RFP process to provide selection of a single qualified collection system SCADA provider and a WWTP SCADA provider for 5 years. This will allow the C-P to select the most qualified provider and include needed maintenance, support and future collection system or WWTP work in a single contract, thereby assuring critical component and overall design consistency across all pump stations or WWTPs for 5 years. After 5 years, the contract of the selected Contractor can be renewed for another 5 years, or another RFP can be used to select a provider for ongoing support and upgrade of the existing collection system or WWTP SCADA system, and for any additions to the SCADA system.

Long-term SCADA support is critical to its success. Therefore, recommended design and delivery approaches are structured to facilitate long-term support. In addition to

maintaining, and providing routine preventive maintenance and software update installation, support is intended to include upgrade and migration to maintain a viable SCADA as technology continues to rapidly evolve. Table 2-1 shows some typical cost considerations for SCADA components.

TABLE 2-1

SCADA Life-Cycle Cost Considerations

Component Annual Costs

Computers (Workstations and Servers) Replacement Every 3 Years Network Appliances Replacement Every 5 Years DCS Controllers, PLCs and RTUs Replacement Every 10 Years

Software 15-20% Per Year + Periodic New Releases

Control System Support 5-15% Per Year

Telco Services 12 x Monthly Bill + Services Outside SLA

Procurement of critical components is another important element of the plan. Critical components are defined as those that, if not consistent from site-to-site and from

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project, will significantly and negatively impact DPW’s ability to maintain the SCADA long-term. Therefore, the delivery of critical components is separately addressed for each of the two major SCADA systems: collection system and WWTPs.

2.3 Design Criteria

SCADA Design Criteria addressing pump stations and plants are included in Appendixes C through H for use in preparation and review of RFPs, design instructions, and/or

documents. Before each use, update Design Criteria as required to keep current, incorporate missing elements, and make corrections.

2.4 Standard Pump Station Design Documents

The purpose of the standard pump station design documents is to provide pump station design guidance for developers for a range of pump stations expected to be included in development projects. For development projects likely to have pump stations not addressed by the standard pump station design documents, include a current version of the Design Criteria document and specific design instructions for the nonstandard pump stations. In general, the standard pump station design documents should be updated to bring them into compliance with the Design Criteria in the appendices. The existing standard pump station drawings should be updated to create standard control system drawings for each type of pump station likely to be included in developer projects. Also, the existing standard pump station specifications should be updated to create standard control system

specifications for each type of pump station included in developer projects.

2.5 Procurement

As stated above, an RFP process is recommended for procurement (including design, installation, and maintenance) of the collection system SCADA and the WWTP SCADA components. Two separate RFPs will be written for each system, since the systems can be implemented separately.

2.5.1 Collection System Request for Proposals Content

Inclusion of the following design instructions in the collection system RFP is recommended: 1. A narrative describing the work and expected delivery schedule. In the narrative,

include a SCADA overview including monitoring and control requirements, network communications and communications interfaces. Use references to included design criteria and standard design documents to clarify requirements and reduce duplication. 2. Scope of Work.

3. Project schedule

4. SCADA Block Diagram 5. Pump Station Design Criteria

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CHAPTER 2. IMPLEMENTATION PLAN

GNV310133631746(CH2).DOC/081640016 2-3 6. Pump Station Standard input/output (I/O) list

7. Standard Loop Specifications

8. When applicable, standard pump station SCADA design documents for the standard pump station(s) with monitoring and control system(s) that most closely resembles the monitoring and control system(s) for the pump station(s) that will be designed along with narrative describing required deviations from the standard documents, if any.

2.5.2 Collection System RFP Scope of Work

Provide a comprehensive summary of the scope of work including:

1. List all tasks to be performed by the provider. Clearly define important deliverables and sequencing requirements. Also, include coordination requirements, a list of

communications service provider and utility contacts and ample references to the design criteria.

2. Define programmable logic controller (PLC) and human machine interface application programming requirements, including instructions on how to use the Standard Loop Specifications.

3. Define coordination requirements for any other work expected to be in progress during construction

4. Define pump station outage restrictions and coordination requirements 5. Define support requirements

2.5.3 WWTP Request for Proposals Content

Inclusion of the following in design instructions in the WWTP RFP is recommended: 1. A narrative describing the work and expected delivery schedule. In the narrative,

include a SCADA overview including monitoring and control requirements, network communications and communications interfaces. Use references to included design criteria and standard design documents to clarify requirements and reduce duplication. 2. Scope of Work

3. Project schedule

4. SCADA Block Diagram 5. WWTP Design Criteria

6. WWTP Standard input/output (I/O) list 7. Standard Loop Specifications

2.5.4 WWTP RFP Scope of Work

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CHAPTER 2. IMPLEMENTATION PLAN

GNV310133631746(CH2).DOC/081640016 2-4

1. List all tasks to be performed by the provider. Clearly define important deliverables and sequencing requirements. Also, include coordination requirements, a list of

communications service provider and utility contacts and ample references to the design criteria.

2. Define distributed control system (DCS) controller, workstation and server application programming requirements, including instructions on how to use the Standard Loop Specifications

3. Define coordination requirements for any other work expected to be in progress during construction

4. Define equipment outage restrictions and coordination requirements 5. Define support requirements

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Appendix A

Block Diagrams

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Appendix B

Design Criteria

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GNV310133631748(APPB).DOC/081640018 B-1

1.0 Introduction and Overview

1.1 Purpose

The purpose of this technical memorandum is to define City of Baton Rouge-East Baton Rouge Parish (C-P) Department of Public Works (DPW) Supervisory Control and Data Acquisition System (SCADA). Major SCADA components covered by this document include:

• Collection Pump Stations.

• Wastewater Treatment Plants (WWTPs). • The Collection System Control Center. • WWTP Control Centers.

• The DPW Operations Data Center. • The DPW Operations Network.

• The Collection System wireless communications network. Criteria provided include the following:

• SCADA Background and Overview. • Terminology and acronym definitions. • Standards and codes list.

• Physical design criteria.

• Network and other communications requirements. • Functional requirements.

• Applications programming requirements. • Documentation requirements.

• Testing requirements. • Support requirements.

• Pump station specific criteria. • WWTP specific criteria.

• Collection Control Center specific criteria. • WWTP Control Center specific criteria. • Operations Data Center specific criteria. • Operations Network specific criteria.

• Collection wireless network specific criteria.

1.2 Background & Overview

The SCADA system project for the C-P DPW will upgrade the existing wastewater

collection pump station SCADA system and replace the SCADA systems at the three major WWTPs. The following is a list of the major SCADA system goals and the basis for the design:

• Increase Operational Reliability of Collection and Treatment: Collection system SCADA improvements are expected to reduce the chances of pump station spillage and overflow. Treatment plant SCADA improvements are expected to improve treatment performance and effluent quality.

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GNV310133631748(APPB).DOC/081640018 B-2

• Ease of Access: Managers and engineers will have easy access to real-time and historical data including regulatory reporting, management oversight, collection system and treatment capacity and quality analysis and improvements planning.

• Improve Collection System and Treatment Facility Planning: Existing SCADA systems have limited data archiving ability. The upgraded SCADA systems will provide more, easily accessible and organized data to support planning efforts. The improved data archives can be used by DPW to improve collection and treatment systems

understanding thereby allowing DPW to make better informed decisions regarding upgrading and expanding the water and wastewater systems.

• Reduce Operating Costs: Once Pump Station and WWTP staffs have gained confidence in the upgraded SCADA systems, labor savings will occur because of improved plant operations efficiencies and a reduction of the number of visits to each pump station. • Support Facilities Information Management (FIM) Tasks: The upgraded SCADA

systems will provide information in a format that is easily transferred to maintenance management or asset management software. As an example, the elapsed run time of process equipment can be downloaded from the SCADA system to a FIM system. These data can be used by the FIM system for scheduling maintenance activities.

• Network Isolation: Isolating the Operations Data Center on a separate network with controlled access from both the Business and Operations Networks provides isolation and protection of the Operations Network and the four control center networks thereby improving the availability and integrity of both the Operations Data Center and Process Control Networks.

The following additional general design criteria have been established for design and construction of the SCADA systems:

• Routine Maintenance Requirements: The SCADA systems must be capable of being maintained on a day-to-day basis by DPW staff. Day-to-day activities are not expected to include any applications programming or system configuration work. Someone with a working knowledge of computer operating systems, computer networks and the applications being used will be required to periodically [probably monthly] review security, event and activity logs, and perform maintenance. Also, periodic [probably quarterly] maintenance by someone with detailed knowledge of SCADA applications and computer operating systems will be required to install software upgrades and patches, to review system logs, to groom files, and perform other system-level activities. • Additional Staff Needs: Either training of existing staff members or adding staff will be

required to perform the day-to-day duties listed above and other SCADA System O&M activities. SCADA system designers are expected to work with DPW to be identify specific skill requirements during design. The monthly and quarterly maintenance activities are expected to be provided as part of a renewable annual service agreement. • Training Requirements: Training requirements, including course identification and

training source, are expected to be identified during design.

• Application Programming Templates: SCADA system designs are expected to include templates to ease the amount of custom programming required to add pump stations or common plant equipment such as pump stations.