The top of the casing shall be effectively sealed against the entrance of water under all conditions of vibration or movement of conductors or cables; The electrical cable shall be firmly attached to the riser pipe at 6 metre intervals or less. Such measures, as a minimum, shall include means to lock all exterior doorways, windows, gates and other entrances to source, treatment and water storage facilities. Analyses should be made to determine the type and, if possible, the cause of the corrosion. Webmecp design guidelines for drinking water systems. (See 3.2). The following items should be considered in evaluating the applicability for reverse osmosis and nanofiltration: Recent advances in computer technology, equipment controls and Supervisory Control and Data Acquisition (SCADA) Systems have brought automated and off-site operation of surface water treatment plants into the realm of feasibility. Web(updated) MECP design criteria. Filter backwash can be discharged to a receiving stream provided waste quality meets environmental regulations. Examples of pre-treatment include media filters, larger opening bag/cartridge filters, infiltration galleries, and beach wells. Any type of connection of the old surface water supply, including the use of a water-main with a closed valve, is not acceptable and will be considered a cross connection. 3.1.3.4Off-stream Raw Water Storage Reservoir, The off-stream raw water storage reservoir is a facility into which water is pumped during periods of good quality and high stream flow for future release to treatment facilities. Proposals for use of disinfecting agents other than those listed shall be approved by the reviewing authority prior to preparation of final plans and specifications. Be of watertight construction throughout; Be of materials and weight at least equivalent and compatible to the casing; Have field connection to the lateral discharge from the pitless unit of threaded, flanged or mechanical joint connection; The design of the pitless unit shall make provision for: A properly constructed casing vent meeting the requirements of Section 3.2.6.5; Facilities to measure water levels in the well (see Section 3.2.6.6); A cover at the upper terminal of the well that will prevent the egress of any form of contamination; A contamination-proof entrance connection for electrical cable; An inside diameter as great as that of the well casing, (up to and including casing diameters of 300. The applicable design standards of Section 7.0 shall be followed for plant storage. They will not produce negative pressure in their inlet lines; The inlet pressure should be at least 140, Automatic cutoff pressure should be at least 140. Since both processes have relatively small membrane pore sizes, membrane fouling, caused by organic and inorganic compounds as well as physical contaminants, can occur if the system is not properly selected or operated. As a minimum, for surface water and groundwater under the direct influence of surface water, the system must be designed to meet the.

The process produces a concentrated waste stream in addition to the clear permeate product. Except when discharging to large waterways, a holding tank of sufficient size should be provided to allow the brine to be discharged over a twenty-four hour period. Where hydrant drains are not plugged, a gravel pocket or dry well shall be provided unless the natural soils will provide adequate drainage.

The following shall be provided for each filter unit: Slow sand filters shall be operated to waste after scraping or rebedding during a ripening period until the filter effluent turbidity falls to consistently below 5 NTU. Open ports, submerged ports, and similar entrance arrangements are required. Usually the entrance velocity should not exceed 30. be installed so that the pumping water level remains above the screen under all operating conditions; where applicable, be designed and installed to permit removal of replacement without adversely affecting water-tight construction of the well; be provided with a bottom plate or wash-down bottom fitting of the same material as the screen. There shall be no risk of backflow to the public water supply.

Filtration of a surface water source or a groundwater source under the direct influence of surface water may not be necessary if all of the following conditions are met: Water treatment facilities designed for processing surface water, and groundwater under the direct influence of surface water shall be designed according to the applicable and/or pertinent treatment process described later in this Part 4. Total salt storage should have sufficient capacity to store in excess of 1-1/2 carloads or truckloads of salt, and provide for at least 30 days of operation. Dead ends should be minimized by looping of all mains whenever practical. Every effort has been made to ensure that all details and information is correct on each of the drawings, however "site specific" conditions and individual requirements will dictate the use of sound engineering judgment and good practice in the proper application of these plans to each specific application. FAQ #6: It is understood that vegetated MRCs (and porous pavement MRCs with

See the relevant Policy Statement on this subject at the front of this document. MF membranes are capable of removing particles with sizes down to 0.1-0.2 microns. Environmental assessment report as dictated in the Canadian Environmental Assessment Act (CEAA) and the Species at Risk Act (SARA). Minimum protected depths of drilled wells shall provide watertight construction to such depths as may be required by the B.C. Redundancy and enhanced security features should be incorporated into the design to eliminate single points of failure when possible, or to protect them when they cannot reasonably be eliminated. Persons designing and equipping laboratory facilities shall confer with the reviewing authority before beginning the preparation of plans or the purchase of equipment.

All or any of the above chemicals when added to a public water supply will tend to depress the pH and increase the aggressive nature of the water. As noted in the title of the source document, these Standards, better known as the 10- State Standards, were last updated in 2003. Hydro-pneumatic tank storage is not to be permitted for fire protection purposes. Suppliers' names, addresses and phone numbers. The pilot plant should use the same sand as proposed for the full scale plant and the period of operation should include seasons with poor water quality conditions. Guides The casing must be provided with sufficient guides welded to the casing to permit unobstructed flow and uniform thickness of grout. Water distribution systems shall be designed to maintain treated water quality. The contact time shall be determined by pilot plant studies; should be provided at points between the anthracite media and the manganese coated media. As an allowance of a safety factor, the contact time determined by the test shall be increased by 10%. Operations and monitoring must also be considered in selecting the best alternative. But, this document is updated and revised as necessary to suit the requirements and needs of First Nations communities. In general, piping shall: The term "lead free" when used with respect to solders and flux refers to solders and flux containing not more than 0.2% lead. The bottom of reservoirs and stand-pipes should be placed at the normal ground surface and shall be above the 200 year flood or the highest flood of record. All storage structures must have an overflow which is brought down to an elevation between 300 and 600. The packed tower aeration process is an aeration process applicable to removal of volatile organic contaminants. Water supplier revenue and budget for continuing operations, maintenance and equipment replacement in the future. The intent of this Document is to propose limiting values for parameters and components from which an evaluation may be made by the reviewing authority of the engineer's plans and specifications. Continued protection of the well site from potential sources of contamination shall be provided either through ownership, zoning, easements, leasing or other means acceptable to the reviewing authority. The plant control system must have the capability for manual operation of all treatment plant equipment and process functions. the bottom elevation above the maximum level of expanded media during washing; the top edge level and all at the same elevation; spacing so that each trough serves the same number of square metres of filter area; maximum horizontal travel of suspended particles to reach the trough not to exceed 1 m. an effective size range of the smallest material no greater than 0.45. a uniformity coefficient of the smallest material not greater than 1.65; Anthracite - clean crushed anthracite, or a combination of anthracite and other media may be considered on the basis of experimental data specific to the project, and shall have: effective size for anthracite used as a single media on potable groundwater for iron and manganese removal only shall be a maximum of 0.8. uniformity coefficient of not greater than 1.65; larger size media may be allowed by the reviewing authority where full scale tests have demonstrated that treatment goals can be met under all conditions.

The design shall prevent cross connections, and common walls, between potable and nonpotable water. Water mains crossing sewers shall be laid to provide a minimum vertical distance of 0.45 metres between the outside of the water main and the outside of the sewer. VZgQhHj%rp;tNFF(8AKtjc!ckXW"6SmV\V.xL} /ThkmZ""alu;YGkER46[MK-jM/!k'm3pvwK(:)8)~IqEkF|?R[i/I{adlRk-FJNi502iF6lI{c'NJ7F:m>Vm4'Z`K$pE! In any case, the filter rate must be proposed and justified by the design engineer to the satisfaction of the reviewing authority prior to the preparation of final plans and specifications. Guard rails must be included. To have a better experience, you need to: Le site Ontario.ca exige JavaScript pour fonctionner comme il faut, avec rapidit et stabilit. Check empty bed contact time and configuration of tank shape, ensure that each contactor has a drain for de-watering.

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no protrusion of the filter walls into the filter media; head room to permit normal inspection and operation; minimum water depth over the surface of the filter media of 1 m; trapped effluent to prevent back flow of air to the bottom of the filters; prevention of floor drainage to the filter with a minimum 100. prevention of flooding by providing overflow; maximum velocity of treated water in pipe and conduits to filters of 0.6. clean-outs and straight alignment for influent pipes or conduits where solids loading is heavy, or following lime-soda softening; wash-water drain capacity to carry maximum flow; walkways around filters, to be not less than 600. safety handrails or walls around all filter walkways; construction to prevent cross connections and common walls between potable and non-potable water. Note #1: A higher hardness may be acceptable to the reviewing authority if experience with similar water quality and reactors shows there are no treatment problems or excessive maintenance required. Slow sand gravity filtration with coagulation pre-treatment (enhanced treatment) should have influent water to the filter with a maximum turbidity of 2 NTU and a maximum colour of 15 TCU. Incorporation of appropriate intrusion alarms must be provided which are effectively communicated to the operator in charge. Chemicals shall be added sufficiently ahead of other treatment processes to assure adequate contact time for an effective and economical use of the chemicals. Description of operator staffing and training planned or completed in both process control and the automation system. The engineer shall submit the design basis for the velocity gradient (G value) selected, considering the chemicals to be added, water temperature, colour and other related water quality parameters. Also, the requirement for a certified operator should be included in the analysis. A manual override shall be provided on all automatic controls. Stainless steel is recommended for piping less than 50 millimetres in diameter. Methods for verifying adequate quality assurances and for routine calibration of equipment should be provided. Separate inlet and outlet pipes, as well as means to avoid stagnation and thermal stratification while encouraging mixing should be considered. 284 0 obj <>/Filter/FlateDecode/ID[<84FF8CDB9399CF43BB5DAF6B0914FE0B>]/Index[268 31]/Info 267 0 R/Length 82/Prev 355404/Root 269 0 R/Size 299/Type/XRef/W[1 2 1]>>stream %PDF-1.6 % The materials and designs used for treated water storage structures shall provide stability and durability as well as protect the quality of the stored water. In concrete tanks, these pipes shall be connected to standard wall casting which were poured in place during the forming of the concrete.

adequate housing must be provided for equipment and for storing the chemicals; convenient and efficient handling of chemicals; a minimum storage volume of 1 truck loads where purchase is by truck load lots. According to the phase of the project, documents submitted for formal approval shall include but not be limited to: Metric (S.I.) Where more than two filter units are provided, the filters shall be capable of meeting the plant design capacity at the approved filtration rate with one filter removed from service. Permanent engineering solutions will take significant time to develop. Sufficient glassware, not limited to beakers, graduated cylinders, erlenmeyer flasks, and volumetric flasks, in varying volumetric capacities for the preparation and testing of samples; Other laboratory equipment such as pipets, glassware drying rack, wash bottles, safety glasses, latex gloves, and kimwipes; Public water supplies which feed poly and/or orthophosphates shall have test equipment capable of accurately measuring phosphates from 0.1 to 20 milligrams per litre; Surface water supplies which utilize aluminum based coagulants shall have test equipment capable of accurately measuring aluminum to a minimum of 0.01 milligrams per litre. shall be provided after completion of work, if a substantial period of time elapses prior to test pumping or placement of permanent pumping equipment; shall be provided after placement of permanent pumping equipment. Download: Guide to amend drinking water works permits, Download: Application form to amend drinking water works permits. Check for pre-treatment required particularly if there are high levels of turbidity, iron and manganese in the raw water. Install a recirculating pump that pumps treated water back to a point ahead of the bag or cartridge filter. Variable turbidity caused by rainfall events is of special concern. Sodium hypochlorite storage and handling procedures should be arranged to minimize the slow natural decay process either by contamination or by exposure to more extreme storage conditions. Provide for a system of records by which the nature and frequency of corrosion problems are recorded. Using contact units rather than replacing a portion of existing filter media; Series and parallel flow piping configurations to minimize the effect of breakthrough without reliance on continuous monitoring; Providing at least two units. All fire pumps and drive units are to be installed and tested according to the requirements of ULC and NFPA 20, Standard for the Installation of Centrifugal Fire Pumps. A minimum of two sources of groundwater or GWUDI is recommended, particularly for remote communities and in larger communities.

4.3.4.1.13. Threshold treatment involving the feeding of a ortho-or blended phosphate or a silicate to control corrosion may be considered for both ground and surface water supplies. Torpedo Sand - a three inch layer of torpedo sand shall be used as a supporting media for filter sand where supporting gravel is used, and shall have: uniformity coefficient not greater than 1.7. Due consideration shall be given to the contact time of the disinfectant in water with relation to. To prevent contamination of both the public supply and potable water vessels being filled, the following principles shall be met in the design of water loading stations: Vehicles and mechanisms for trucked water shall conform to the relevant federal and provincial standards and regulations for water vending.

The detention time for effective clarification is dependent upon a number of factors related to basin design and the nature of the raw water. It is recommended that all systems, as a minimum, use an instrument using the. There must be a determination that the bacteriologically unsafe water is not due to the influence of surface water. To make an alteration or modification that has not been included as a preauthorized condition, you will need to amend your drinking water works permit (DWWP). Larger size mains may be required to allow the withdrawal of the required fire flow while maintaining the minimum residual pressure of 140 kPa. Webmecp design guidelines for drinking water systems. WebDesign Guidelines 1.0 General 2.0 Private Development Projects 3.0 Agency Improvement Projects 4.0 Planning 5.0 Water Pipeline Design 6.0 Sewer Pipeline Design 7.0 Reservoir Design 8.0 Pressure/Flow Control Stations 9.0 Water Pump Station Design 10.0 Sewer Pump Station Design 11.0 Corrosion Control 12.0 Specialized Design Standard endstream endobj 269 0 obj <>/Metadata 38 0 R/Names 285 0 R/Pages 254 0 R/StructTreeRoot 73 0 R/Type/Catalog/ViewerPreferences<>>> endobj 270 0 obj <>/MediaBox[0 0 612 792]/Parent 254 0 R/Resources<>/Font<>/ProcSet[/PDF/Text/ImageC]/XObject<>>>/Rotate 0/StructParents 0/Tabs/S/Type/Page>> endobj 271 0 obj <>stream Disinfection: Disinfection is required for all surface water supplies and groundwater under the direct influence of surface water. Pump stations shall be adequately lighted throughout. Automation of surface water treatment facilities to allow unattended operation and off-site control presents a number of management and technological challenges which must be overcome before an approval can be considered. Aluminum Hydroxide sludge can be discharged to a lagoon. Ensure that construction materials are compatible with the aggressive nature of salt. The following treatment processes may be considered for the removal of arsenic: Not all the above treatment options are pH dependent, but where they are, consideration should be given to raising or depressing the pH of the raw water to suit the selected process with the appropriate chemical. Protection from leakage of grout into the gravel pack or screen shall be provided; Permanent inner and outer casings shall meet requirements of Section 3.2.4.4 (Temporary Steel Casing); Minimum casing and grouted depth shall be acceptable to the reviewing authority. Down spout pipes shall not enter or pass through the reservoir. Water storage tanks are typically made of concrete or steel. As per Health Canada Guidelines for Canadian Drinking Water Quality - Supporting Documentation on Turbidity - for chemically assisted filtration (i.e., continuous feed of a coagulant with mixing ahead of filtration), source water turbidity levels should be measured at least once per calendar day directly in front of where the first treatment chemical is applied. The distance shall be measured edge to edge. Provide for a system of records by which the nature and frequency of corrosion problems are recorded. All permanent well casing shall be surrounded to a minimum of 40 mm of grout to the depth required by the reviewing authority. Physical measurement of the rate of corrosion can be made by the use of coupons, easily removed sections of pipe, connected flow-through pipe test sections or other piping arrangements. Provision shall be made to prevent energizing the motor in the event of a backspin cycle. Test equipment for alkalinity, total hardness, carbon dioxide content, and pH should be provided to determine treatment effectiveness. Areas where homes are protected by residential sprinklers: For areas where the conditions of clause 8.2.3(c) are true, the distance between a fire hydrant and a building should be less than 150 metres, and the distance between fire hydrants should not exceed 300 metres.

Bagged salt and dry bulk salt storage shall be enclosed and separated from other operating areas in order to prevent damage to equipment. Chlorine residual test equipment recognized in the latest edition of Standard Methods for the Examination of Water and Wastewater shall be provided and should be capable of measuring residuals to the nearest 0.01 milligrams per litre. Where pumps are sealed with potable water and are pumping water of lesser sanitary quality, the seal shall: Pumps, their prime movers and accessories, shall be controlled in such a manner that they will operate at rated capacity without dangerous overload. Regenerated carbon using only carbon previously used for potable water treatment can be used for this purpose. The sanitary waste from water treatment plants, pumping stations, and other waterworks installations must receive treatment. The material used in construction of reservoirs shall be acceptable to the reviewing authority. The history of power outages, existing and proposed system storage, and current and projected water use shall be reviewed to determine the need for portable, or in-place auxiliary power. 4.3.8.2.1.