| Project Name: Canon Manor West Assessment District Improvements | Project # W06001 |
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| March
30, 2006
SONOMA COUNTY NOTICE TO PLANHOLDERS CANON MANOR WEST ASSESSMENT DISTRICT IMPROVEMENTS COUNTY PROJECT NOS. W06001, W06002, W06003 ADDENDUM
NO. 3 I. Changes to Plans and Special Provisions Changes to Plans and Special Provisions as per attached sheets. Please fill out the Addendum Acknowledgment sheet (page BB-9 of the Bidder’s Book, Volume 1 of 3) verifying your receipt of this Addendum (Addendum No. 3). DAVID D. KNIGHT, DIRECTOR _John Maitland, Original Signed__ ATTACHMENT: Schedule A – Pump Station Sheet 2 of 24 ~ C-101 Contractor to relocate existing Reclaimed Water Line. Schedule A – Trunk Sewer and Force Main Sheet 2 of 20 Ref STD 512. Locking cover required for manhole inside Pump Station and all manholes inside Canon Manor (Schedule B). Delete STD 880.
Sheets 4 through 12 of 20 10" Force Main shall be HDPE as specified in Section 02532 of Book 2 of 3 of the Special Provisions. Provide additional Locator Box Sta 16+25 at curb return. Sheets 4 and 8 of 20 All angles in 10" Force Main shall be made with multiple 22 ½° Ells. Sheet 6 of 20 The following utility trench has been noted based on utility company records: Trench crosses street at Sta 26+05. Sheet 7 of 20 Pour concrete plug in existing sewer entering manhole at Sta 32+05. Sheet 8 of 20 Pour concrete plug in 3 locations inside existing sewer manhole at Sta 33+50 and 2 locations inside existing sewer manhole at Sta 36+75. Sheets 9, 10 and 11 of 20 The 1 ½" AC overlay is shown with cross hatches as noted in Legend on Sheet 1 of 20. Sheet 11 of 20 Delete Hot Tap at Sta 40+21. Install Cut in Tee and 2-8" Gate Valves and 1-4" Gate Valve for 4" water main connection. Delete STD 880 and provide STD 874 for back flow device. Install 4" Pressure Sustaining Valve in valve box outside of City Right-of-Way set at 50 psi on City side of valve. Cost for above items shall be included in Bid Item 19A 4" Water Main Connection. Pressure Relief, Pressure Sustaining Valve Valve shall be CLA-VAL – Model No. 50-01/650-01 Function The valve shall maintain a constant upstream pressure by bypassing or relieving excess pressure limits without causing surges. If upstream pressure decreases below the spring setting, the valve shall close. Main Valve The valve shall be hydraulically operated, single diaphragm-actuated, globe or angle pattern. The valve shall consist of three major components: the body with seat installed, the cover with bearings installed, and the diaphragm assembly. The diaphragm assembly shall be the only moving part and shall form a sealed chamber in the upper portion of the valve, separating operating pressure from line pressure. Packing glands and/or stuffing boxes are not permitted and there shall be no pistons operating the main valve or pilot controls. Main Valve Body No separate chambers shall be allowed between the main valve cover and body. Valve body and cover shall be of cast material. Ductile Iron is standard and other materials shall be available. No fabrication or welding shall be used in the manufacturing process. Total shipping weight, in all respects, shall be equal to or greater than the Hytrol 100-01/100-20 body. The valve shall contain a resilient, synthetic rubber disc with a rectangular cross-section contained on three and one-half sides by a disc retainer and forming a tight seal against a single removable seat insert. No O-ring type discs (circular, square, or quad type) shall be permitted as the seating surface. The disc guide shall be of the contoured type to permit smooth transition of flow and shall hold the disc firmly in place. The disc retainer shall be of a sturdy one-piece design capable of withstanding opening and closing shocks. It must have straight edge sides and a radius at the top edge to prevent excessive diaphragm wear as the diaphragm flexes across this surface. No hourglass-shaped disc retainers shall be permitted and no V-type or slotted type disc guides shall be used. The diaphragm assembly containing a non-magnetic 303 stainless steel stem of sufficient diameter to withstand high hydraulic pressures shall be fully guided at both ends by a bearing in the valve cover and an integral bearing in the valve seat. The seat shall be a solid, one-piece design and shall have a minimum of a five-degree taper on the seating surface for a positive, drip-tight shut off. No center guides shall be permitted. The stem shall be deemed necessary. The diaphragm assembly shall be the only moving part and shall form a sealed chamber in the upper portion of the valve separating operating pressure from line pressure. The flexible, non-wicking, FDA approved diaphragm shall consist of nylon fabric bonded with synthetic rubber compatible with the operating fluid. The center hole for the main valve stem must be sealed by the vulcanized process or a rubber grommet sealing the center stem hole from the operating pressure. The diaphragm must withstand a Mullins Burst Test of a minimum of 600 psi per layer of nylon fabric and shall be cycle tested 100,000 times to insure longevity. The diaphragm shall not be used as the seating surface. The diaphragm shall be fully supported in the valve body and cover by machined surfaces which support no less than one-half of the total surface area of the diaphragm in either the fully open or fully closed position. Sheet 12 of 20 SSMH No. 32. Provide 32" manhole cover with struts. Provide Pig Catcher inside manhole. Line manhole with HDPE. Cost for above items shall be included in Bid Item No. 16A 60" sewer manholes. Sheet 13 and 14 of 20 Pour concrete plug in existing sewer manholes as follows:
Pressure grout existing 6" sewer between manholes at Sta 24+25 to Sta 26+50. Cost for grouting of existing sewer and plugging of manholes in Camino Colegio and Bodway Parkway shall be included in Item No. 8A – Clearing and Grubbing. Sheets 17 to 20 of 20 All sewer manholes on 18" trunk shall be 60" in diameter. Sheet 19 of 20 Base of existing SSMH at Sta 181+30 shall be rebuilt as shown on Detail A attached. Cost shall be included in Bid Item No. 16A 60" sewer manhole. SCHEDULE B – SANITARY SEWER AND DRAINAGE IMPROVEMENTS SHEETS 5 THROUGH 40 The following additional utility services have been noted based on utility company records. These services will run from the existing utility trench or gas main to serve the following lots:
Refer to Book 2 of 3 of the Special Provisions. These Specifications apply to the Pump Station only. Delete Division 2 Section 02510 Sewer Systems and Section 02700 Paving. Sewer System and Paving shall be as specified in Book 1 of 3 of the Special Provisions. Technical Specifications 1. Add: Attached SECTION 13450 – "Process Instrumentation and Control" Drawings 2. C-502 –
"DETAILS - 2" 3. M-101 – "PUMP STATION PIPING PLAN" Add: Note: All site piping shall be ductile iron pipe except the following: Dual force main north of the cleanout vault and gravity mains coming into the wet well prior to the plug valves. 4. M-301 – "SECTIONS" Modify: Note labeled "3" PVC DRAIN WITH INTEGRAL 3" BALL CHECK (TYP.)," leader arrow should point to the end of the drain pipe at the vault floor. 5. E-101 – "ELECTRICAL SITE PLAN" Modify: See Figure 1. Revise Drawing E-101 as shown on Figure 1. Changes are shown as clouded. 6. I-101 – "P&ID" Add: PT-101 instrument bubble and PT-102 instrument bubble to match conditions shown in detail 1 on drawing M-101 "PUMP STATION PIPING PLAN." FIGURE 1 – "Revisions to drawing E-101"
SECTION 13450 PROCESS INSTRUMENTATION AND CONTROL SYSTEM PART 1 GENERAL 1.1 SUMMARY A. Section includes remote terminal unit (RTU), radio, antenna, magnetic flowmeter, and related hardware and software to expand an existing system. B. Related Sections:
1.2 REFERENCES A. Except as otherwise indicated, the current editions of the following standards apply to the Work of this Section:
1.3 SYSTEM DESCRIPTION A. Central Personal Computer System: An existing central personal computer system is located at the City of Rohnert Park’s Public Works Corp Yard, 600 Enterprise Drive, Rohnert Park. The computer is running WonderWare In-Touch HMI software. Configure the central personal computer system, existing front end processor (FEP), the remote terminal unit (RTU) at the Canon Manor Pump Station, and related software to perform the following functions:
B. Central Communication System: Configure central communication units, data communication network, and related software to control input and output between central control system and remote control system. C. Remote Terminal Unit: Existing system is comprised of Modicon Momentum RTUs, including the front-end processor. Configure remote terminal unit to perform the following functions:
1.4 DESIGN REQUIREMENTS A. Minimum System Configuration: Accommodate flow input point, plus one spare analog input. Provide two spare digital inputs. B. Operator Data Terminal Unit: Provide operator interface functions through remote terminal unit, including manual setpoints and overrides, alarm display and acknowledge, graphic display, and operation logging. C. Design operator display terminal data screens with the following features: 1. Provide constant display of date, time, and system status. D. Layout local control panel to allow operator to view displays, acknowledge system alarms and messages, manually enter data or commands. E. Central Control System: Perform the following functions:
F. Design central communication system to control input and output between each remote terminal unit.
G. Remote Terminal Units 1. Provide the following
functions and features: H. Current Technology: Control panel components shall be the most recent field-proven models marketed by the manufacturers at the time of submittal of the shop drawings unless otherwise required to match existing equipment I. Coordinate integration of RTU,
including programming of central WonderWare A. Loop Descriptions
B. Set level transmitter and floats to set points as shown on drawing M-301. These include: PUMP ON, PUMP OFF, HIGH LEVEL ALARM, LOW LEVEL ALARM, and EMERGENCY HIGH LEVEL ALARM. C. Ramp up pump to operate at full speed while meeting the design conditions per Section 11900. Pump will remain operational until level transmitter "PUMP OFF" set point is achieved. 1.6 SUBMITTALS A. Section 01330 - Submittal Procedures: Submittal procedures. B. Shop Drawings: Indicate system configuration; interconnection wiring diagrams; location, data characteristics, range and units for each input and output point; logic diagram for each type of control routine; programming and operating reference for central processing unit operating system; programming and operating reference for each application and example of programming language. C. Product Data: Submit data for each component, including sensors, control drives and elements, plug-in circuit boards, and enclosed equipment units. Submit cabinet dimensions, weights, and support point locations for each item of enclosed equipment. 1.7 CLOSEOUT SUBMITTALS A. Section 01700 - Execution Requirements: Closeout procedures. B. Project Record Documents: Record actual locations of every input and output circuit termination, and identification marking of each circuit. C. Manufacturer's Field Reports: Indicate acceptance of component and equipment installation. D. Operation and Maintenance Data: Submit programming and operating reference for central processing unit operating system. Submit programming and operating reference for general programming and application languages; programming and operating reference for remote control programming; comprehensive operating reference for specific control systems; and listing of each application program used in control and monitoring routines, trouble shooting and repair procedures. 1.8 QUALITY ASSURANCE A. Employ installers who are skilled and experienced in the installation and connection of all the elements, accessories and assemblies of communication systems. 1.9 QUALIFICATIONS A. Manufacturer: Company specializing in manufacturing products specified in this section with minimum three years documented experience, and with service facilities within 100 miles of Project. B. Installer: Company specializing in performing Work of this section with minimum three years documented experience approved by manufacturer. 1.10 PRE-INSTALLATION MEETINGS A. Convene minimum one week prior to commencing work of this section. 1.11 DELIVERY, STORAGE, AND HANDLING A. Section 01600 - Product Requirements: Product storage and handling requirements. B. Protect electronic components from construction operations, dust, and adverse environmental conditions by storing in air-conditioned space. 1.12 FIELD MEASUREMENTS A. Verify field measurements prior to fabrication. 1.13 WARRANTY A. Furnish one year (minimum) extended warranty, availability, and cost of extended support, and type of customer support provided. 1.14 MAINTENANCE SERVICE A. Furnish service and maintenance of SCADA system for one year from Date of Substantial Completion. B. Provide software revisions issued during maintenance service period. 1.15 MAINTENANCE MATERIALS A. Furnish special tools required for maintenance. PART 2 PRODUCTS 2.1 HARDWARE A. Remote Terminal Unit 1. CPU Module a. The RTU shall use a 16 bit microprocessor, operating at a 16 MHz clock rateb. The on-board operating system or firmware shall consist of EE PROM and shall be available for upgrades without the changing of any hardware or firmware items. Additionally, upgrade capability shall be available either directly or over the communications channel/network c. Diagnostic LEDs: for status, and for CPU or Module Fail. d. The CPU shall incorporate a hardware real-time clock (RTC) with lithium battery backup e. The CPU shall continue its operations after power restoration with the same functions that have been interrupted 2. Analog Input Module a. Resolution: At least 12 bits including signb. Overall accuracy: +0.05% of full scale; 30 ppm/'C c. Linearity: +0.5 LSB d. Input Types: 4-20 ma into 250 Ohm maximum, 0-5 V into 10 K Ohm minimum, +1 ma into 4 K Ohm maximum, 1 V into 10 K Ohm minimum. e. Input Isolation: 2.5 KV optical isolation between inputs and system ground (on-board isolating DC/DC converter); 200 V peak (AC/DC) isolation between inputs. f. Diagnostic LEDs: Per input plus under/over flow g. The AI module shall provide 24 VDC to power analog current loops, and the user may optionally decide whether or not to use the internal source or an external source 3. Operator Interface Panel a. Panel-mount, monochrome operator panel, touch screen or with eight function key buttons, with appropriate interface to match RTU, in NEMA 4 enclosure, for display of text information. 4. RF transceiver module a. Transmission: RF transmitters shall be directly frequency modulated by a built-in digital modem from the digital data stream furnished by the central computer system. RF receivers shall provide a digital data stream to the central computer system.b. The telemetry unit shall include solid-state, FM radio transceiver. Units shall be spread-spectrum, compatible with existing Microwave Data Systems model 9710, operating at 952 / 928.65625 MHz. c. Receivers shall be superheterodyne types employing crystal-controlled local oscillators. d. Transceivers shall fully comply with all applicable and current EIA Standards and all current FCC Rules and Regulations. Transceivers shall be FCC type accepted for the application e. Transceivers and associated equipment shall be designed to operate on 12 or 24 VDC. 5. Battery Backup System a. Each
transceiver shall have a 12 or 24 VDC battery backup
system (including a battery charger). The power backup
system shall be capable of powering the radio and its
associated equipment for a minimum of 72 hours. The
battery backup system shall be isolated from the primary
power. Upon primary power failure, the power shall be
transferred to the backup system by use of relay contacts
or diodes. Battery tapping of a 24 V power system to
obtain 12 V is not acceptable. 6. Antenna Systems: 7. The RTU shall
operate, as specified, over an ambient temperature range
of -30 to +60'C, with a relative humidity of up to 95%,
according to EIA standards RS204B and RS-152B,
intermittent duty specifications. 10.Provide the RTU in a NEMA 12 wall mounted cabinet, with a pad-lockable hinged door with gasket and stainless steel external hardware. 11. The RTU shall be designed to accommodate, either 4 or 6 slots for I/O and/or processor modules.12. The RTU shall operate from continuous 120VAC (+10%, -15%) 60 Hz primary power. The power supply shall provide either 12 or 24 VDC for powering digital input circuits as well as analog input current loops and shall feature automatic recharging of the standby DC power source. 13. Each RTU shall be able to serve as a store and forward repeater. 2.2 PLASTIC RACEWAY A. Product Description: Plastic channel with hinged or snap-on cover. 2.3 TERMINAL BLOCKS A. Product Description: NEMA ICS 4, terminal blocks. B. Power Terminals: Unit construction type with closed back and tubular pressure screw connectors, rated 600 volts. C. Signal and Control Terminals: Modular construction type, suitable for DIN rail mounting, with tubular pressure screw connectors, rated 300 volts. D. Include ground bus terminal block, with each connector bonded to enclosure. 2.4 MAGNETIC FLOW METER A. Magnetic flow measuring systems shall be of the low frequency electromagnetic induction type and produce a DC pulsed signal directly proportional to and linear with the liquid flow rate. Complete zero stability shall be an inherent characteristic of the flowmeter system. Each magnetic flow metering system shall include a metering tube, signal cable, transmitter, and flowmeter grounding rings. 1. The metering tube shall have the following attributes: a. Constructed of Type 316 stainless steel with flanged connections. b. Use a minimum of 2 bullet-nosed, self-cleaning electrodes. c. Liner in conformance with the manufacturer's recommendation for sewage service. d. Electrodes constructed of materials that are in conformance with the manufacturer's recommendation for the intended service. e. Meter housing rated for NEMA 6 submergence conditions. f. Meter coating consisting of epoxy paint finish. g. Two grounding rings that conform with the manufacturer's bore and material recommendation for the intended service. Grounding rings shall be designed to protect and shield from abrasion the liner edge interface at the meter end. 2. The microprocessor-based signal converter/transmitter shall have the following attributes: a. Use DC pulse technique to drive flux-producing coils. b. Convert DC pulse signal from the tube to a standardized 4-20 mA signal into a minimum of 700 ohms. c. A 6 digit LCD display for flow rate, percent of span, and totalizer. d. An operator interface consisting of keypads which respond to English text entry. e. Integral zero return to provide a consistent zero output signal in response to an external dry contact closure. f. Integral low flow cutoff and zero return. g. Automatic range change. h. Programmable parameters including meter size, full scale Q, magnetic field frequency, primary constant, time constant. i. Data retention for a minimum of 5 years without auxiliary power (main or battery). j. Self diagnostics and automatic data checking. k. Protected terminals and fuses in a separate compartment that isolates field connection from electronics. l. Tolerate ambient temperature operating limits of -20 to +140 degrees F. B. Calibration: Each magnetic flowmeter system shall be hydraulically calibrated at a facility that is traceable to the National Institute of Standards and Technologies. The calibrations procedure shall conform to the requirements of ANSI/NCSL-2540-1. C. Performance: The flow metering system shall conform to the following requirements:
2.5 PRESSURE TRANSDUCER/SENSOR A. Manufacturers:
B. Product Description
2.6 SUBMERSIBLE LEVEL INDICATING TRANSDUCER / SENSOR A. Manufacturers:
B. Product Description: Hermetically sealed pressure transducer probe assembly, transmitter, and interconnecting cables. To be used as transducer/transmitter for sensing devices.
PART 3 EXECUTION 3.1 EXAMINATION A. Verify electric connections are available, in proper locations, and ready for use. 3.2 INSTALLATION A. Coordinate the installation of the communication system with all applicable utility companies and regulatory agencies having jurisdiction to secure approvals and permits that are required. B. Provide all equipment so that it will be readily accessible for operation and maintenance. The City of Rohnert Park reserves the right to require minor changes in equipment location before installation, without any additional cost. C. Install and connect all field-mounted components and assemblies as recommended by the manufacturer and as indicated. 3.3 ENCLOSURE SIGNAL AND CONTROL CIRCUIT WIRING A. Install all wires in plastic wireways, except (1) field wiring, (2) wiring between mating blocks in adjacent sections, (3) wiring from components on a swing-out panel to components on the fixed structure, and (4) wiring to panel-mounted components. Wiring from components on a swing-out panel to other components on fixed panels shall be tied into bundles with nylon wire ties, and shall be secured to panels at both sides of the hinge loop so that conductors are not strained at the terminals. Run signal and low voltage wiring separately from power and 120V control wiring. B. Tie together wiring to control devices on the front panels at short intervals with nylon wire ties and secure to the inside face of the panel using adhesive mounts. C. Provide wiring to rear terminals on panel-mount instruments in plastic wireways secured to horizontal brackets above or below the instruments, in about the same plane as the rear of the instruments. D. Designate each signal, control, alarm, and indicating circuit conductor connected to a given electrical point by a single unique number, which shall be shown on all shop drawings. Mark these numbers on all conductors at every terminal using numbered white plastic-coated cloth wire markers, or permanently marked heat-shrink plastic. E. Seal and weatherproof antenna connections and openings. 3.4 INTERFACE WITH OTHER PRODUCTS A. Connect to field instruments and devices external to the RTUs at a terminal strip located within 2 feet of the proposed RTU location, inside the controls enclosure. 3.5 FIELD TESTING A. Test each system sequence by simulation of normal, off normal, and alarm conditions. B. Exercise all systems furnished under this section through operational tests in the presence of the City’s representative in order to demonstrate compliance with requirements. The testing of the communication system shall be performed in accordance with and as an integral part of the testing of the instrumentation and controls. 3.6 MANUFACTURER'S FIELD SERVICES A. Install and debug hardware and software. Perform hardware configuration revisions required to accommodate software patches. 3.7 ADJUSTING A. Section 01700 - Execution Requirements: Testing, adjusting, and balancing. B. Calibrate instruments, adjust ranges and adjust display configurations so system performs as specified. 3.8 CLEANING A. Section 01700 - Execution Requirements: Final cleaning. B. Clean equipment finishes and interiors of equipment cabinets. 3.9 DEMONSTRATION AND TRAINING A. Demonstrate operation of system. B. Provide training on the operation of the RTU equipment. Include theory of operation, fault isolation, and replacement procedures. Provide operator training on how to operate the equipment, including the new Wonderware screen(s) . C. Provide a minimum of one (1) day of training. Facilitate actual training of staff on the working system. Provide manuals before the training begins to clearly identify the operation and diagnostics of the system. 3.10 PROTECTION OF INSTALLED CONSTRUCTION A. Section 01700 - Execution Requirements: Protecting installed construction. 3.11 INPUT/OUTPUT LIST
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