PROJECT ADDENDUM NO. 1

Transcription

1 MUNICIPALITY OF THE COUNTY OF COLCHESTER WASTE MANAGEMENT MASTER PLAN COMPONENT 1 CENTRAL COLCHESTER WASTEWATER TREATMENT FACILITY UPGRADES PROJECT ADDENDUM NO. 1 (to be added to and made part of the Tender Documents) The following changes or modifications shall be made to the Tender Documents: TO THE SPECIFICATIONS SECTION INFORMATION TO TENDERERS Page 2, delete clause 7 and replace with the following:.7 The Tenderer shall fill in the Completion Time and is notified that the completion date based on this will be taken into account in considering the tenders. This project is funded under the Building Canada Fund Communities Component, and as such Substantial Performance of the Work must be achieved no later than September 30, Page 6, add new clauses 25.4 and 25.5 as follows: 25.4 Historical data:.1 Daily influent and effluent flow 1997 to Instantaneous decant flow rates February 1 to 8, Control Narrative & System Integration Summary, Issue 0, March 22, 2011 SECTION TENDER FORM Delete Section and replace with new Section dated March 21, 2011, attached. SECTION GENERAL REQUIREMENTS Page 3, add new clause 6.13 as follows: 6.13 The existing SBR cycles times are based on incoming flow rate as follows:.1 Average Day (18,200m3/day) 90 minutes anoxic fill, 90 minutes aerated fill, 90 minutes react, 45 minutes settle, 45 minutes decant (360 minutes total)..2 Maximum Day (44,000m3/day) 1 minute anoxic fill, 64 minutes aerated fill, 88 minutes react, 45 minutes settle, 19 minutes decant, 87 minutes filled decant (304 minutes total).

2 Mun of the County of Cochester Page 2 Waste Management Master Pan Component 1 Cent ra Coichester WWTF Upgrades Project Addendum No. 1 Page 7, add the following to the end of clause 16.1: The Contractor s daily water use shall be monitored by the Owner. The Owner reserves the right to increase or decrease the Contractor s daily water allowance with seventy-two (72) hours notice. The Contractor is responsible for all excavation, backfill, piping, fittings and restoration, as required, for their site water connection. Page 21, add new clause 42.4 as follows, and re-number subsequent clauses: 42.4 System Integrator responsibilities:.1 Modify and test existing plant SCADA software (VT Scada by Trihedral Engineering) as required for process upgrades..2 Modify and test operator interface computers to accommodate upgrades to SCADA software and plant HMI..3 Provides programming, testing and verification of existing plant PLC5 in accordance with the latest revision of the Control Narrative and System Integration Summary document, as prepared by the Consultant.4 Verify and coordinate communication with vendor package control systems..5 Is present for operation of system through tests with Contractor, equipment field service representatives, Consultant and Owner..6 Participate in the equipment start-up testing conducted by the Contractor..7 Provides training and instruction on plant SCADA system to the operation and maintenance personnel..8 Provides documentation of testing and operation of plan SCADA and HMI systems to the Owner. SECTION CAST-IN-PLACE CONCRETE Page 5, clause delete the roof slabs of the Pipe Gallery and Pages, add new clause as follows: Floor sealing compound:.1 Surface sealer: to CAN/CGSB-25.20, 1, solvent-based, colour clear..2 Prepare surface by opening equivalent to that of 200 sandpaper by blast wiping, sanding or acid etching. Clean surface after acid-etching..3 Apply in two layers, with first layer applied as primer coat thinned by 20%..1 Acceptable product: Amershield, as manufactured by PPG Americoat, or approved equivalent..2 Mixing, ratios and application in accordance with manufacturer s instructions. SECTION PAINTING Page 9, delete clause and replace with the following:.10 Formula 10: for ductile iron piping coated with manufacturer s asphalt sealer: 1 touch-up coat for rust stained areas, Pitt-Tech rust inhibiting primer 1 coat BIN pigmented white shellac sealer 2 coats semi-gloss enamel CGSB-1.59 (Glidden 4308, PPG 54 line)

3 Mun of the County of Coichester Page 3 Waste Management Master Plan Component 1 Central Coichester WWTF Upgrades Project Addendum No. 1 SECTION EXIT LIGHTS Page 2, clause 2.4, change clause title to read STANDARD UNITS TYPE EXL4. SECTION PROCESS VALVES AND MISCELLANEOUS EQUIPMENT Pages, add new clause as follows: Valves KGV 651, 652, 653 and 654, size as indicated on the drawings. Heavy duty, ductile or cast iron body with EPDM seats and braided PTFE packing with EDPM 0-ring seal. Connections to be 125 lb. flanged to ANSI/ASME B16.1 complete with lugs. Liner and gate material to be 304 stainless steel to ASTM A240. Page 5, delete clause and replace with the following: Valve shall provide bi-directional sealing/shutoff. Valves 600 mm diameter and smaller to be rated for 1 O34kPa working pressure. Valves greater than 600 mm diameter to be rated for 69OkPa working pressure. SECTION PROCESS MECHANICAL INSULATION Page 2, clause 2.2, change clause title to read PIPE INSULATION (TYPE 2). SECTION PROCESS CONTROL SYSTEM EQUIPMENT AND CABLING Page 1, delete clause and replace with the following: The Contractor shall be responsible to secure the services of a control System Integrator for the overall plant control system integration requirements, to integrate the new controls equipment and process changes with the existing plant control systems to provide a fully integrated plant control system as indicated or implied in the contract documents. This work shall include, but not necessarily limited to, the following:.1 Integration of the new plant equipment into the existing plant control systems..2 The re-programming of the existing site PLC cabinets as required to accommodate the new plant equipment and process changes..3 The development of new HMI graphics screens for the plant s existing HMI control system to accommodate the new plant equipment and the modification of any existing HMI graphics screens, alarms, dial outs, and all applicable items as required..4 The testing and commissioning of the above mentioned new integrated controls equipment, PLC programming and HMI additions/modifications..5 The operator training of the new integrated plant control systems..6 Refer to the most recent Controls Narrative document, P&lD drawings, control system block diagram, etc., to help determine the system integration and PLC/HMI programming requirements. Also work closely with the Consultant and Owner to refine the PLC programming requirement. It shall be the responsibility of the control System Integrator to become familiar with the existing plant control systems (PLC programming, HMI system software, local LAN, and all applicable items as required).

4 Mun of the County of Coichester Page 4 Waste Management Master Plan Component 1 Central Coichester WWTF Upgrades Project Addendum No. 1 SECTION SCREENING EQUIPMENT Page 17, add new clause 2.8 as follows: 2.8 Service Water Surnjly.1 The screening system supplier shall supply and provide control programming for water supply components as shown on the drawings and as required for a fully operational screening system:.1 Variable area flowmeter: Non-fouling type rotameter with removable clear glass tube, high visibility float, EPDM 0-rings/seals, and true union socket type end connections. Accuracy +/-0.5% of indicated value. 300 stainless steel body, polycarbonate shield, bore sizeto suit. Flow range 0 to 5.0 liters per minute. Display flow in L/min scale. Acceptable product: ABB 1 0A or approved equivalent..2 Flow switch (FS 141): To suit rotameter, intrinsically safe, suitable for Class 1 Zone 2 hazardous environment, 120 VAC to generate alarm on no-flow condition if solenoid valves are open..3 Solenoid valves (FY 140, FY 150): in accordance with Section SECTION SBR PROCESS EQUIPMENT Page 5, delete clause and replace with the following: Maximum Daily Flow: 67,400 m3/d SECTION ULTRAVIOLET DISINFECTION SYSTEM Page 10, add new clause as follows: The UV control system shall limit the number of available banks for operation based on the status of the existing power generation diesel and a control signal from the existing Headworks PLC (PLC 02). The operator selects how many UV banks are permitted to run under diesel power from the main plant SCADA. The position of the automatic transfer switch indicates the status of the diesel generator. The UV system controller receives these two inputs and includes control logic to reduce bank output and/or reduce the number of operating banks. TO THE DRAWINGS DRAWING Al - SCREENING BUILDING PLAN & SECTIONS 1. Delete reference to interior waterproofing on Section B-B. 2. Dashed line under slab on grade in Section B-B is Dampproofing.

5 Mun of the County of Cochester Page 5 Waste Management Master Ran Component 1 Centrai Cochester WWTF Upgrades Project Addendum No. 1 DRAWING S15 MASONRY AND STEEL MISCELLANEOUS DETAILS 1. Delete 42.2 O.D. reference on Detail 4 Typical Handrails and replace with HSS D.. 2. Delete 42.2 O.D. STD PIPE reference on Detail 15 Safety Chain at Handrail Openings and replace with HSS 42.2 O.D. x 3.18 THK DRAWING S16 BLOWER & PRELIMINARY TREATMENT ROOM UPGRADES 1. Detail 4 delete reference to 12.5 mm stainless steel 31 6L bent plate and replace with 10 mm stainless steel 31 6L bent plate. DRAWING P1 - PROCESS FLOW DIAGRAM 1. Delete MH 87-1 and 87-2 from the hydraulic profile. DRAWING P4- P&I DIAGRAM SHEET 2 OF 3 1. Extend the limits of Section SBR Process Equipment scope of supply boundary to include in-basin aeration piping and fine bubble diffusers in the Equalization Tank. DRAWING P9 - DEGRITTER TANK OUTLET ARRANGEMENT 1. Detail 1 New Drop Box Arrangement delete reference 6 mm SS 316 Plate (Typ) See Structural Drawings and replace with SS 316L Plate (Typ) See Structural Drawings. DRAWINGS Ml SCREENING BUILDING, PLUMBING, HEATING & VENTILATION AND M2 SBR UPGRADES, PLUMBING, HEATING & VENTILATION 1. Revise all Motorized Damper Schedules to indicate Manufacturer/Model shall be Tamco 9000 c/w Belimo Actuator. Brett Pugh, P.Eng CBCL Limited March 22, 2011

6 CCDC Mun of the County of Colchester Tender Form Section Central WWTF Upgrades Page 1 Project ADDENDUM NO. 1 March 21, 2011 TO: Municipality of the County of Colchester FROM: The undersigned Tenderer, having carefully read and examined the undermentioned Contract Documents prepared by CBCL Limited for the completion of the Municipality of the County of Coichester, Waste Management Master Plan Component 1, Central Colchester Wastewater Treatment Facility Upgrades, Project , in accordance with the following documents: Description of Work and List of Drawings Information to Tenderers Tender Form Stipulated Price Contract Supplementary General Conditions Specifications of Work Drawings Addendum/Addenda No. * (s) * The Tenderer will insert here, the number of Addenda received during the tendering period and taken into account in preparing the Tender. hereby accepts the same as part and parcel of the Contract herein referred to, and having carefully examined the locality and Site of Works and having full knowledge of the work required and of the materials to be furnished and used, does hereby Tender and offer to enter into a contract to perform and complete, the whole of the said works and provide all necessary labour, plant, tools, materials and equipment and pay all applicable taxes, as set forth and in strict accordance with the Specifications, Drawings and other Contract Documents and to do all therein called for on the terms and conditions and under the provisions therein set forth as follows: CONTRACT PRICE ADD EST (15%) OF CONTRACT PRICE $ $ 4 TOTAL AMOUNT PAYABLE Tenderer s HST Registration No. COMPLETION TIME 1. Tenderer agrees to complete Substantial Performance of the Work within weeks of written notification of Award but in no case later than September 30, 2012.

7 Mun of the County of Colchester Tender Form Section Central WWTF Upgrades Page 2 Project ADDENDUM NO. 1 March 21, 2011 The Undersigned Tenderer: (1) Declares that this tender is valid for acceptance until 2011 (being sixty (60) calendar days from the date set for to the Owner). its delivery (2) Declares that the Contract Price set forth in the Tender Form has been correctly computed for the purposes of this tender and that includes and covers all duties, and handling charges; transportation; and all other charges. Harmonized sales tax is not to be included in the Contract Price. (3) Hands you herewith by way of deposit a Bid Bond or Certified Cheque in the amount of ten percent (10%) of the Total Amount Payable on the understanding that in the event of this tender not being accepted by you, then this deposit will be returned to the undersigned Tenderer either at the time that the Contract is awarded to some other Tenderer, or at the expiration of validity of this tender, whichever is the sooner. initial initial (4) Undertakes in the event of your acceptance of the tender, to execute a formal agreement in the form hereto attached, within seven (7) days of written notification of Award and further agrees to provide by way of surety for the due performance of the Contract, a Performance Bond and a Labour and Material Payment Bond satisfactory to the Owner as to form, each issued in the amount of fifty (50) percent of the Total Amount Payable. (5) Undertakes, in the event of your acceptance of the Tender, to achieve Substantial Performance of the Work within the number of weeks of written notification of Award indicated above. (6) Agrees that in the event of failing or neglecting either to provide the bonds or other security and/or to execute the Agreement in the manner hereinbefore undertaken, then the deposit being the amount of ten percent (10%) of the Total Amount Payable or the additional cost of accepting another tender up to a maximum of ten percent (10%) of the Total Amount Payable whichever is the lesser, shall be forfeited. initial (7) Agrees that unless and until a formal agreement is prepared and executed, this tender together with your written of acceptance thereof shall constitute a binding Contract between us. letter (8) Understands and agrees that the Owner reserves the right to reject all tenders or any tender; not necessarily accept the lowest tender; waive any irregularities, formalities, informalities or technicalities, and to accept or reject any offer whatsoever as considered by the Owner to be in best interest. its it

8 Mun of the County of Colchester Tender Form Section Central WWTF Upgrades Page 3 Project ADDENDUM NO. 1 March 21, 2011 (9) Agrees to provide, maintain and pay for the insurance coverages specified in the Contract Documents. One copy of all insurance policies of the Contractor and two copies of certificates of insurance, certifying to the issuance of all insurance policies, shall be furnished to the Owner. Each and every insurance policy shall name the Contractor, Owner and Consultant as being insured in the full amount of the insurance. An additional copy of the certificates of insurance shall also be provided to the Consultant. (10) Declares to have personal knowledge of the location of the proposed work and is informed as to the actual conditions and requirements, including labour conditions and labour rules and shall not claim at any time after execution of the Contract that there was any misunderstanding in regard to such conditions and requirements. (11) Declares to have carefully examined the documents and Addenda No. to referred to in the first paragraph of this Form of Tender, and the Tenderer hereby accepts and agrees to the same as forming a part of the Contract. (12) Agrees that the Warranty Period defined in the Contract Documents shall be for a period of one (1) year from the date of Substantial Performance of the Work. (13) Understands that Substantial Performance of the Work will be established in accordance with General Conditions of the Contract. (14) Understands that after the issue of the Certificate of Substantial Performance of the Works by the Consultant, provided that the Contractor has relieved the Owner from any and all claims, demands and lien claims for and in respect of the Contract, and has completed all outstanding items and corrected all deficiencies, the Contractor shall submit an application for Final Payment and the Consultant will thereafter prepare the Final Certificate for payment in accordance with the General Conditions of the Contract. (15) Understands that the payment of holdback will be in accordance with the General Conditions of the Contract and subject to the provisions of the Builders Lien Act of Nova Scotia. (16) Agrees that time shall be construed as being of the essence of the Contract. This project is funded under the Building Canada Fund Communities Component, and as such Substantial Performance of the Work must be achieved no later than September 30, 2012.

9 Mun of the County of Colchester Central WWTF Upgrades Project Tender Form ADDENDUM NO. 1 Section Page 4 March 21, 2011 DATED THIS DAY OF [Seal] Name of Firfriendering Signature of SignOfficer Witness Name and Title (Printed Witness Signature of Signing Officer Name and Title (Printed) Company Addrs Telephone No. J Fax No. *NOTE: Tenders submitted by or on behalf of any Corporation must be signed and sealed in the name of such Corporation by a duly authorized officer or agent. END

10 Municipality of the County of Colch ester Waste Management Plan Component 1 Central Colchester Wastewater Treatment Facility Upgrades Control Narrative & System Integration Summary CBCL LIMITED Consulthig Engineers CBCL Project MCC Project No. Description Date By 0 Tender Issue March 22, 2011 B. Pugh

11 TABLE OF CONTENTS SECTION 1 Overview. 1 Li Purpose of this Document Treatment Plant Overview General Description of the PLC System General Description of the HMI System General Display Items Screen Arrangements Auto-Dialer Remote Access Motors 7 SECTION 2 Operational Control of Process Facilities Screening Building Trash Pump Raw Water Flow Measurement Gas Detection and Air Flow Monitoring Panel HMI Modification Summary Headworks Sewage Pump Station Equalization Tank Limit SBR Feed Pumps on Emergency Power 14 2,3.2 Equalization Tank Bypass Mode Equalization Tank Aeration HMI Modification Summary Secondary Process Expansion Effluent Flow Control Waste Sludge Flow Control SBR Aeration Flow Control Limit SBR Blowers on Emergency Power Air Flow Monitoring Panel HMI Modification Summary Ultraviolet Disinfection System Limit UV Banks on Emergency Power HMI Modification Summary 24 SECTION 3 WWTF General Utilities Plant Service Water System Low Pressure Air Drainage Pump Stations Standby Power Systems WWTF Ventilation Systems 26

12 Siemens Central Colchester Wastewater Treatment Facility Upgrades Project No Page 1 SECTION 1 Overview 1.1 Purpose of this Document The purpose of this document is to provide guidance for the system integrator to provide a complete program for the PLC/SCADA systems that form part of the Central Colchester Wastewater Treatment Facility (CCWWTF) Upgrade project. This document is meant to be a dynamic tool to allow for input from designers, operators, commissioning engineers and system integration personnel; as such, the document will undergo changes and will not be complete until all systems are functioning and operational. This document should be read in conjunction with the Issued for Tender drawings and specification and the latest copy of control programming documentation from the major equipment suppliers Water Technologies Sequencing Batch Reactor System, Trojan UV Disinfection System, pumping equipment and screening system suppliers. 1.2 Treatment Plant Overview The Municipality of the County of Colchester (MCC) is a rural municipality surrounding the Town of Truro, Nova Scotia. MCC operates a wastewater treatment facility to treat wastewater from the Town of Truro and the MCC. In 2007, MCC completed a Waste Management Master Plan (WMMP) Study to define and address the outstanding issues within their environmental infrastructure. The plan identified needs to upgrade the Central Colchester Wastewater Treatment Facility (CCWWTF) and identified the economic need to provide leachate pre treatment at the landfill site. The continued addition of leachate to the CCWWTF, plus the increased loads resulting from population growth within the sewer shed, has resulted in the CCWWTF exceeding its capacity for some parameters. Therefore, upgrades to the CCWWTF are required as part of the Waste Management Master Plan. These upgrades include improved raw water screening, raw water flow measurement, flow/loading equalization, secondary process expansion, and the addition of ultraviolet (UV) disinfection. The upgraded CCWWTF is designed for average daily flows 26,550m3/day and peak daily flows 67,400m3/day. The upgraded facility incorporates the following existing process units: Diversion Chamber on the raw wastewater trunk sewer; Headworks Sewage Pump Station (HWSPS); Preliminary Treatment Area, including grinder/auger, flow measurement and aerated degritter tank; Sequencing Batch Reactor (SBR) Basins #1 and #2;

13 idle, Central Colchester Wastewater Treatment Facility Upgrades Project No Page 2 SBR Aeration Blowers #1 and #2; Effluent Chamber and associated piping; Biosolids Processing Facility; Emergency Generators at HWSPS, main treatment building and Biosolids Building; and Outfall to Salmon River. The upgraded CCWWTF includes the following new process units: Screening Building; Equalization Tank and SBR Feed Pumps; SBR Bain #3; Ultraviolet (UV) Disinfection System; Mechanical system improvements; Electrical System Upgrades; and Control System Modifications. CCWWTF is located at 3899 Highway 236 to the west of the Town of Truro. The CCWTF was constructed in three (3) phases in the mid-1990s. The three (3) buildings are the Headworks Sewage Pump Station (HWSPS), main wastewater treatment facility (WWTF) and the Biosolids Building. The new Screening Building is located above the existing trunk sewer near the HWSPS. The Equalization Tank and SBR #3 are expansions to the existing two (2) basin SBR system at the WWTF. The UV system in located in an expansion to the HWSPS and replaced an existing concrete baffled Chlorine Contact Tank chamber. Raw wastewater flows from MCC and the Town of Truro in a gravity trunk sewer to the CCWWTF. The new Screening Building includes a bar screen and a screening washer/compactor to remove non-organic materials from the raw wastewater. Flow continues by gravity from the Screening Building through the existing Diversion Chamber to the HWSPS. The Diversion Chamber includes a flap gate which allows overflows of raw screened wastewater to the outfall. The HWSPS includes four (4) self priming wastewater pumps which deliver wastewater to the Preliminary Treatment Area in the WWTF building. The Preliminary Treatment Area includes a grinder/auger, a bypass coarse screen, flow measurement by flume, and an aerated degritter tank. A new pipe captures effluent from the degritter tank and sends it to the new Equalization Tank for flow and quality equalization. Four (4) low-head submersible SBR Feed Pumps discharge from the Equalization Tank into the existing SBR Influent Channel. Secondary treatment is achieved in the three (3) SBR basins in a batch process, with each tank cycling through several process steps fill, react, settle and decant. Floating decanters extract effluent from the SBR to the existing Effluent Chamber. Effluent then flows by gravity to the new UV disinfection system and on to the Outfall. A waste sludge pump in the SBR pipe gallery extracts solids from the SBR process to the Biosolids Building for further treatment. This project does not include any upgrades to the existing biosolids treatment process. CBCL Limited Consulting Engineers

14 Central Colchester Wastewater Treatment Facility Upgrades Project No Page General Description of the PLC System The CCWWTF operates 24 hours a day and full time attendance is not necessary. Most processes within the plant include automatic control. The hardware associated with the existing plant control includes four (4) main PLC (Programmable Logic Controller) and four (4) HMI (Human Machine Interface), or operator interfaces. The upgrades include three (3) new PLC, the conversion of an existing PLC into a remote I/O rack for one of the new PLC and programming changes to several existing PLC and additions/modifications to the existing plan HMI graphic screens. The System Integrator verifies all plant PLC inputs, outputs, scaling parameters, calibration and functionality of all primary devices. The System Integrator confirms and adjusts system parameters during plant commissioning. The coordination and participation of commissioning of VFD s, process equipment, and instrumentation shall be within the scope of the System Integrator. The System Integrator shall work with the equipment supplier s field service representatives to test and confirm operation of plant equipment through the main plant control system. Confirming the set up of internal device settings pertinent to the plant PLC operation shall be within the scope of the System Integrator. The System Integrator will provide PLC programming modifications to the existing plant PLC as required to accommodate the new process equipment. The equipment vendors are responsible for programming and testing of their supplied PLC to facilitate a working equipment package. The System Integrator coordinates the required interlocks and communication protocols to incorporate the new packages into the CCWWTF, while minimizing or avoiding interruptions to the operated treatment facility. The new Screening System PLC (VCC 01) operates the bar screen, washer/compactor and their associated instrumentation. VCC 01 includes provisions to receive and communicate I/O from other equipment in the Screening Building that is not in the Screening System equipment trash pump, ventilation, gas detection and warning lights. VCC 01 is connected to the existing plant HMI system through a new Ethernet switch in the HWSPS. The new SBR System PLC (VCC 02A) controls all SBR related equipment for the upgraded three (3) basin system. The existing SBR PLC (VCC 02B), which previously operated the two (2) basin system, is to be modified by the SBR supplier to become a remote I/O rack for the new SBR PLC (VCC 02A). The new VCC 02A includes logic for operation of all three (3) SBR, aeration blowers, waste sludge pump, and their associated valve and instruments. The SBR Feed Pumps and their associated level instruments (located in the Equalization Tank) are not supplied in the SBR equipment package, but are controlled by VCC 02A. VCC 02A is connected to the existing plant HMI system through the existing Data Highway Plus network. The existing Data Highway Plus connection to VCC 02B is to be moved to the new VCC 02A.

15 Headworks Biosolids Piping Screening UV SBR New Existing Central Colchester Wastewater Treatment Facility Upgrades Project No Page 4 The new UV system PLC (VCC 03) controls the two (2) bank UV system, automatic level control weir gate (FMV 703) and its associated equipment. VCC 03 is connected to the existing HMI system through a new Ethernet switch in the HWSPS. The System Integrator is responsible for modifications to PLC logic in the existing Sewage Treatment Plant (STP) PLC (PLC 01) and the existing Headworks PLC (PLC 02) as required to integrate the new process equipment. The System Integrator is responsible to become familiar with the existing plant PLC programming logic. Refer to Drawings P2 through P5 for an overview of the CCWWTF upgraded Process and Instrumentation requirements. Drawing E15 shows the new portion of the Control System Block Diagram and the I/O list for VCC 02A/B. In summary, the existing CCWWTF PLC as listed here: PLC 01 Main Plant PLC Cabinet (existing STP PLC) PLC 02 PLC Cabinet (existing) VCC 02B SBR PLC Cabinet (existing) PLC #4* - Building PLC Cabinet (existing) The new SBR PLC will replace the existing SBR PLC, which in turn becomes a remote I/O rack: VCC 02A SBR PLC Cabinet VCC 02B SBR PLC, controller is replaced with remote I/O communication card for connection to VCC 02A Individual equipment vendors will provide separate Control Systems/PLC s for the following systems: RLY 01 Screening Building Gas/Air Flow Detection Relay Control Cabinet RLY 02 Gallery Low Air Flow Detection Relay Control Cabinet VCC 01 System VCC 03 System VCC 04 SBR Aeration Blower #1 Surge Control Panel (existing) VCC 05 Aeration Blower #2 Surge Control Panel (existing) VCC 06 SBR Aeration Blower #3 Surge Control Panel (new) VCC 07 SBR Aeration Blower #4 Surge Control Panel (new) VCC 08 Trash Pump Control Panel VCC 09 SBR 4*3 Sump Pump Control Panel

16 Central Colchester Wastewater Treatment Facility Upgrades Project No Page General Description of the HMI System The HMI, otherwise referred to as the operator interface, is a PC based software package that allows the operator to adjust or control certain functions within the plant. The HMI provides process monitoring and control, system alarms, trending, after hours alarm dial-outs as well as interaction with the remote sites, etc. In general, the HMI for the CCWWTF consists of desktop personal computers (PC) running Windows XP and VT Scada, from Trihedral Engineering, as the operator interface software. The HMI communicates to the main plant process equipment through the existing Ethernet and Data Highway Plus networks. Process related information is read from all the PLC s on a continuous basis and displayed on the HMI. The PC is to be set up to automatically log into Windows XP upon power-up and to automatically start the operator interface software. There are two (2) HMI PC in the existing Control Room that are in communication with the existing Data Highway Plus network and the existing Ethernet network to gather plant information. There is one (1) HMI PC in the HWSPS and one (1) HMI PC in the Biosolids Building that can be connected to the plant system as required through an internet client connection on the plant wireless LAN system. The System Integration shall provide new HMI graphic screens to accommodate the new process equipment, and shall modify the existing HMI graphics, as required, to facilitate the new plant equipment/processes. As a minimum, new HMI graphics screens shall be developed of the new screening equipment, the new UV system, the new Equalization Tank/SBR Feed Pumps and the new SBR basin. Any new HMI screens shall be developed to match the existing HMI graphics in appearance and functionality. It shall be the responsibility of the system integrator to become familiar with the set up an of all the function s of the existing plant HMI system. All existing functions of the HMI systems shall be maintained during the upgrade. These functions include, but are not limited to, remote accessibility, alarm dial out, and monitoring of remote sites. The System Integrator will be responsible to test the operation of uninterruptible power supplies in the new control cabinets General Display Items In general, represent all devices that are in use in the system on the HMI. When available, most motor driven devices will show statuses for running, auto select and various faults. Other statuses for motor driven devices may include current readings, speed readings, start counters, run times and enable statuses.

17 Central Coichester Wastewater Treatment Facility Upgrades Project No Page 6 When available, motor operated valves will display the position of the valve as well as the position of the auto select. The valve will have a different display for opened, closed, and midswing (neither open nor closed) status. Most valves will have a Fail To Open (FTO) and/or a Fail To Close (FTC) alarm that will be displayed if it were to occur. The HMI displays the scaled representation of analog devices such as temperature, pressure and flow meters in the units in which they are measured. If a device goes out of range the item will flash on the screen and an alarm will activate. Most devices which can detect a fault status have an associated fail reset button with it. The fail reset button will allow the device to be used again once the fault is cleared. Devices which require a set point through the HMI will have a field where the operator can enter the numeric value with the keyboard. Some devices will have the ability of being Enabled/Disabled from the HMI. For devices with this ability a button will be provided for each state. The state in which the device is in will be shown in proximity of the enable/disable buttons. Devices are to be automatically restored to the enabled status when their HOA switch is moved to the off position Screen Arrangements The HMI will be password protected through the login procedure so only authorized personnel who have successfully logged into the system may make changes to system parameters, including PLC set-points, auto-dialer settings, equipment resets, alarm acknowledgement etc. Users who do not log on still have the capability to monitor process information, alarms etc. The system will automatically log out a user after 15 minutes of inactivity, to prevent unauthorized persons from accessing critical functions and/or set points, should the operator have forgotten to log out. The system generally consists of the following screens and/or pop-up windows that are accessible either from the menu bar(s) located at the bottom of the screen or off the MENU button located at the bottom left of the screen. The System Integrator shall verify the configuration of the existing HMI system and tailor the new elements to suit the existing configuration. Process Overview Major Components Screens o Screening Building o Headworks Sewage Pump Station o Preliminary Treatment including Grinder/Auger and Flume o Degritter Tank including Grit Blowers o Equalization Tank including SBR Feed Pumps CBCL Limited Consulting Engineers

18 Central Coichester Wastewater Treatment Facility Upgrades Project No Page 7 o SBR System (for all three (3) tanks) o UV Disinfection System o Biosolids Building o General Utilities (Generators, Sump Pumps, etc) Dialer Page Alarm Page Report Page Trending Most of the devices in the main screens will have the ability to be clicked to reveal a pop-up window which will display more information/function of the device Auto-Dialer The auto-dialer is a component of the VTS software which uses a computer modem and phone line to send voice messages to an operator when a high or critical alarm occurs. The operator has the capability of the following: Adjusting the times of day, which the dialer will call out. Enabling or disabling specific dial-outs. Entering phone numbers into call lists. The dial out activity and errors will be logged by the HMI. The system integrator will comment on the alarm titles, advise which alarms require call-outs, and will review the list of alarms Remote Access The System Integrator shall maintain the remote access functionality of the existing system with any upgrades, including access through local LAN, web-based or dial-up, as required. Whichever method is used, the user will be prompted for a username/password in order to logon the system. When logged in, the user will have the same privileges as well as see the same screen as if they were logged into the master computer Motors The control system shall be programmed to include the following features: All motors with running signals will contain Run Timers and Start Counters Both Run Timers and Start Counters are reset by HMI user with a single HMI reset stats button

19 Central Colchester Wastewater Treatment Facility Upgrades Project No Page 8 Any motor that has both a Running and a Start out signal will have a Failed To Start alarm (FTS) which occurs if the running signal is not seen (user defined) seconds after the start command is issued. An occurrence of any alarm will remove the start command to the motor, and will lock out the motor until a fault reset is preformed. A fault reset will not be accepted if the any alarm situation still exists when the reset is preformed. A Fault reset is performed by pressing a HMI user with a Fault Reset button or by moving the local hand off auto (HOA) switch (if equipped) from auto, to hand, back to auto. All motors can be Enabled or Disabled by the HMI, via an Enable/Disable button. When disabled, the motor will operate while the HOA switch is in automatic. A motor will be designated as unavailable if it is faulted, disabled or if its HOA switch is not in automatic.

20 Central Colchester Wastewater Treatment Facility Upgrades Project No Page 9 SECTION 2 Operational Control of Process Facilities 2.1 Screening Building The screening system is located in the new Screening Building positioned above the raw wastewater inlet trunk sewer, just upstream of the existing Diversion Chamber. The Screening Building includes a Screening Area, Mechanical Room and Electrical Room. The Screening Room is classified as a Class 1 Zone 2 hazardous location, while the Mechanical and Electrical Room are unclassified. The screening system includes a new bar screen in a dedicated channel complete with rake and chain cleaning system, washer/compactor and automatic bagging unit. Screenings are automatically conveyed from the bar screen into a bin located in the Screening Area. Screening are washed, dewatered, and bagged prior to disposal in the bin for volume reduction, improved handling and odour control. The roll off bin is supplied by MCC for removal from the Screening Area through a roll up door. Screenings are disposed of offsite. The screening system includes a fixed bar rack with chain driven rake arms. Multiple rake arms are required because of the deep channel and the desire to minimize the time interval between clearing of the screen. An automatic wiper mechanism at the top of the screen clears the screenings from the rakes and into a hopper. The hopper feeds the washer/compactor, where the screenings are sprayed. Wash water is directed back into the screening channel downstream of the screen. A spiral screw conveyor compact and reduces the volume of the screenings. An automatic bagging unit is attached to the end of the discharge chute from the washer/compactor Refer to Drawings P3, P6 and P7 for the layout of the Screening Building. Drawing P3 identifies the equipment supplied under section Screening Equipment. The following process components are supplied by under and controlled by VCC 01: Bar Screen Tag Number M 120 Screening Building Main Channel Controls Automatic from VCC 01 on timer or differential level Local Controls Emergency Stop, Hand/Off/Auto, Forwa rd/reverse Running Forward, Running Reverse, Start Forward, Start Reverse, Auto Select Alarms Fault Level Controllers Level Sensors LE/LIT 110 and 115 Screening Channel

21 Central Colchester Wastewater Treatment Facility Upgrades Project No Page 10 Hydrostatic submersible Water level upstream of screen (LT 110) Water level downstream of screen (LT 115) Level Sensor LE/LIT 155 Bypass Channel Hydrostatic submersible Water level in Bypass Channel High Level Switch LSH 111 Screening Channel High water level upstream of screen Washer/Compactor Tag Number M 130 Screening Area Controls Automatic from VCC 01 on timer Local Controls Emergency Stop, Emergency Pull Chord, Hand/Off/Auto, Forward/Reverse Running Forward, Running Reverse, Start Forward, Start Reverse, Auto Select Alarms Fault Compactor Speed Switch ZS 135 Washer/Compactor discharge chute Alarms Compactor zero speed Service Water Supply Tag Number FS 141 Service Water Supply to Screening Equipment in Screening Area Alarms No Water Flow Wash Valve FY 140 Water Supply to Washer/Compactor Controls Open/Close SprayValve Controls FY15O Water Supply to Pan Spray Open/Close VCC 01 controls the function of the bar screen, washer/compactor, level instruments and water supply solenoids. The Screening Equipment supplier shall furnish a complete pre-wired control panel. The Control Panel shall include all equipment required to control the screening system as specified. The Control Panel is located in the Electrical Room. The screen is controlled in synchronization with two (2) submersible, hydrostatic-type level sensors, one located upstream

22 Central Colchester Wastewater Treatment Facility Upgrades Project No Page 11 and one located downstream of the bar screen. Upon reaching a predetermined differential set point, the screen shall begin operation in normal speed and shall shut down after a predetermined time if the differential level is less than the predetermined set point. When an over-current is detected, the screen shall automatically stop and generate an alarm signal. A separate Local Operator Station is located next to the screen unit and includes Hand/Off/Automatic and Forward/Off/Reverse 3-position switches and an Emergency Stop mushroom pushbutton. The following equipment is not supplied with the Screening Equipment under , however, its status is communicated through the Screen System PLC (VCC 01) and shall be coordinated by the System Integrator: Trash Pump Tag Number P 150 Bypass Channel Submersible trash pump Local Controls Hand switch HS 150 On/Off Running Alarms Fault Raw Water Flow Meter Tag Number FE/FIT 180 Velocity Area with Option for Surcharge Condition Downstream end of Screening Channel Level, Velocity, Raw Water Flow Alarms Fault Trash Pump A trash pump is located in the bypass channel. This pump allows the operator to clear the bypass channel of any water collected during a bypass event or back-flow from the downstream side during surcharge conditions. The trash pump is operated manually from a local hand station in the Screening Area, with its status displayed on the main plant SCADA Raw Water Flow Measurement Total raw water flow is measured at the outlet pipe from the Screening Building using an area/velocity radar flow meter. This sensor combines radar velocity sensing with ultrasonic level measurement to remotely measure open channel flow. The flow meter is mounted to the channel wall just above the top of the outlet pipe. The raw water flow meter automatically switches to an electromagnetic velocity sensing method during surcharge events when the flow meter becomes submerged. This allows the continuous measurement of total raw water flows in dry and wet weather.

23 Central Colchester Wastewater Treatment Facility Upgrades Project No Page Gas Detection and Air Flow Monitoring Panel The Screening Building Gas Detection and Air Flow Failure Relay Control Panel RLY 01 (JB 980) is located in the Electrical Room. RLY 01 monitors the status of the Screening Area Gas Detectors (AE 160, AE 161 and AE 162) and the ventilation system air flow switches (FSL 170, FSL 171). RLY 01 communicates the status of the gas detectors and flow switches to VCC 01. VCC 01 includes spare space for gas alarm, gas fault and air flow alarm. The System Integrator shall coordinate the operation of RLY 01 to test the associated alarms, lights and horns. VCC 01 communicates with the main plant control system using an Ethernet connection to a new Ethernet switch located in the new UV Electrical Room at the HWSPS HMI Modification Summary The System Integrator shall display the Screening System on a new, separate HMI page. Include screen status, washer/compactor status, level sensors status, trash pump status, RLY 01 status and alarms for faults as listed above. Include a fault alarm on the HMI for the Screening System Controller VCC 01. Bypass flows are calculated as the difference between the total raw water flow at the Screening Building and the CCWWTF influent flow as measured at the existing flume in the Preliminary Treatment Area (FT 38). Some calibration is required before bypass events can be accurately measured using this principle. Display raw water flow from FE 180 and calculated bypass flows on HMI as instantaneous value (L/s), totalized (m3), and previous 24 hour totalized flow (m3) between 6:00 am current day and 6:00 am previous day. 2.2 Headworks Sewage Pump Station The new UV system is supplied from the existing HWSPS electrical switchboard. The existing HWSPS 400 kw generator does not have the capacity for all process loads. Provide control logic at the Headworks PLC (PLC 02) to limit the maximum number of process units that are permitted to run under emergency power. The existing 400 kw generator is suitable for running at one time either: A. Three (3) HWSPS pumps and one (1) UV bank; or 8. Two (2) HWSPS pump and two (2) UV banks. Provide a toggle switch on the main plant HMI that allows the operatorto select the preferred process equipment combination (A or B). This toggle switch shall be available from both the HWSPS and UV pages of the HMI. Clearly display the selected option for quick reference.

24 Central Coichester Wastewater Treatment Facility U pgrades Project No Page 13 The System Integrator shall provide a control screen the main plant HMI which allows the operator to select the number of HWSPS Pumps (0 to 4) permitted to run under emergency power. This selection is communicated to PLC 01. The default selection is two (2) HWSPS Pumps. 2.3 Equalization Tank The Equalization tank is located downstream of the existing Preliminary Treatment Area. The Equalization Tank is an underground storage tank incorporated into the SBR and pipe gallery structure. The Preliminary Treatment Area effluent flows from the Degritter Tanks to the Equalization Tank by a new gravity-fed pipe. New stainless steel drop boxes with bottom outlet pipes replace the existing effluent boxes in the Degritter Tanks. A new stop log assembly is installed in the Preliminary Treatment Area to prevent back flow from the SBR Influent Channel to the Degritter tanks. Flow and quality equalization is expected to occur in the Equalization Tank. Four (4) low-head submersible SBR Feed Pumps discharge from the Equalization Tank into the SBR Influent Channel. An intermediate wall with a manual sluice gate splits the Equalization Tank into two compartments. This configuration allows for isolation of half of the tank for servicing and maintenance without interrupting the operation of the other half. Both compartments are used during normal operating conditions. Three (3) overflow ports are positioned along the intermediate wall above the design top water level. Refer to Drawings P4 and PlO for the layout and configuration of the Equalization Tank and SBR Feed Pumps. The SBR Feed Pumps are supplied by the Contractor but the Equalization Tank level instruments are supplied under section SBR Process Equipment. Control and integration of the SBR Feed Pumps and their level instruments is provided by the SBR System Supplier at their Controller VCC 02A. SBR Feed Pumps Quantity 4 Tag Number P411, P412, P421, P422 Equalization Tank Submersible centrifugal pump Controls Start/Stop by SBR PLC (VCC 02A) Local Controls Hand switch On/Off Current, Running, Auto Select Alarms Fault, Leakage, Over temperature Level Controllers Level Sensors LE/LIT 415, LE/LIT 425 Equalization Tank Chamber land 2 Hydrostatic submersible

25 Central Colchester Wastewater Treatment Facility Upgrades Project No Page 14 Level EQ Tank 1 Level Switches LSLL 416, LSL 417, LSH 418, LSHH 419 EQ Tank 2 Level Switches LSLL 426, LSL 427, LSH 428, LSHH 429 Ball Floats Control Status The SBR System Supplier provides control logic for SBR Feed Pump operation, cycling and alarming through VCC 02A. The ball floats are installed at elevations determined by the SBR System Supplier to provide a back-up control for the SBR Feed Pumps if the level sensors fail. The System Integrator shall provide a status switch on the main plant HMI to indicate if one half of the Equalization Tank is down for maintenance. This switch shall render the pumps and level instruments on that side inactive. The System Integrator shall coordinate the Equalization Tank maintenance status with the SBR Supplier Limit SBR Feed Pumps on Emergency Power The existing 600 kw WWTF generator does not have the capacity for all process loads. Control logic must limit the maximum number of process units that are permitted to run under emergency power. The existing 600 kw generator can sustain only two (2) SBR aeration blowers along with building heat/mechanical loads. The System Integrator shall provide control logic modifications at the existing STP PLC (PLC 01) to prevent the four (4) SBR Feed pumps from running on the 600 kw generator. The System Integrator shall coordinate this function with the SBR supplier and test interlock status between PLC 01 and VCC 02A. The generator status is communicated by the status of its Automatic Transfer Switch, located in the WWTF Electrical Room. The System Integrator shall provide a control screen the main plant HMI which allows the operator to select the number of SBR Feed Pumps (0 to 4) permitted to run under emergency power. This selection is communicated to VCC 02A. The default selection is zero (0) SBR Feed Pu m PS Equalization Tank Bypass Mode The Equalization Tank may be bypassed for maintenance or to suit process requirements. Bypass is achieved by either closing the manual knife gate valves on the Equalization Tank feed pipe or by shutting down the SBR Feed Pumps. In the bypass condition, all flow from the Degritter Tanks is directed over an end weir plate instead of through the outlet pipes in the new drop boxes. Effluent from the Degritter Tanks then fills the existing effluent channel to the top of the new stop log assembly. Degritter effluent then overflows the stop logs into the SBR Influent Channel.