Homeowners can have confidence in their choice of a metal roofing contractor knowing they have met certain requirements in their services.
Plant Layout The following items should be considered with regards to plant layout: 1. Functional aspects of the plant layout, 2. Provisions for future plant expansion, 3. Provisions for expansion of the plant’s waste treatment and disposal facilities, 4. Access roads, 5. Site grading, 6. Site drainage, 7. Walks, 8. Driveways, and 9. Chemical delivery.
Building Layout Design of the building shall provide for: 1. Adequate ventilation, lighting, heating, and drainage, 2. Dehumidification equipment, if needed, 3. Accessibility of equipment for operation, servicing and removal/replacement, 4. Flexibility of operation, 5. Operator and visitor safety, 6. Convenience of operation, and 7. Separation of chemical storage and feed equipment areas to reduce hazards and dust problems.
Location of Structures Structures shall not be located in areas subject to flooding nor shall impede normal or flood stream flows. Department of Environment and Conservation Water Works 3 – 1 Guidelines For The Design, Construction & Operation of Water & Sewerage Systems.
Electrical Controls Main switch and electrical control gear shall be located above grade, in areas not subject to flooding. Surge protection should be provided. Standby Power Dedicated auxiliary standby power shall be required so that the water may be treated.
Chemical and physical guidelines as specified in the latest version of the Guidelines for Canadian Drinking Water Quality (GCDWQ) shall be considered as objectives, which are applicable to the Province of Newfoundland and Labrador. The GCDWQ note that the maximum acceptable concentration (MAC) can be achieved by available water treatment methods at reasonable cost and it must also be reliably measurable by available analytical methods. If it is determined that water quality criteria are exceeded, priority should be given to meeting the GCDWQ objectives.
Supervisory Control and Data Acquisition (SCADA) equipment to monitor water being discharged to the distribution system as follows: 1. Plants treating surface water and plants using lime for softening should have the capability to monitor the parameters to evaluate adequate CT disinfection including turbidity, pH, temperature, and free chlorine residual; and Department of Environment and Conservation Water Works 3 – 2 Guidelines For The Design, Construction & Operation of Water & Sewerage Systems 2. Plants treating groundwater using iron removal and/or iron exchange softening should have the capability to monitor and record free chlorine residual.
Facility Water Supply The facility water supply service line and the plant finished water sample tap shall be supplied from a source of finished water at a point where all chemicals have been thoroughly mixed, and the required disinfectant contact time has been achieved. There shall be no cross-connections between the facility water supply service line and any piping, troughs, tanks, or other treatment units containing wastewater, treatment chemicals, raw, or partially treated water.
Meters All water supplies and treatment facilities shall have an acceptable means of metering the finished water. Electronic data loggers that record and store data as well as totalled flow data are recommended. Piping Colour Code To facilitate identification of piping in plants and pumping stations, it is recommended that the colour schemes outlined in Tables.