mecp design guidelines for drinking water systems
A velocity of flow through the intake conduit of 0.65 to 1.0 m/sec at rated capacity; Routine back flushing and cleaning of the inlet lines; Adequate markers or identification of intakes, intake pipe locations, anchoring and protection against rupture by shipping, recreation boats, dragging anchors, ice, Ports located above the bottom of the stream, lake or impoundment, but at sufficient depth to be kept submerged at low water levels and under severe ice conditions - normally 1 to 3. Water that lacks alkalinity for coagulation treatment or is unstable, aggressive and/or corrosive due to previous or subsequent treatment shall be conditioned to improve coagulation or stabilized to reduce corrosion effects. The drain shall not be connected directly to any storm or sanitary sewer; a blow-off line should be provided in the effluent piping to allow for discharge of water/chemicals used to clean the tower; the design shall prevent freezing of the influent riser and effluent piping when the unit is not operating. Infiltration lines should be considered only where geological conditions preclude the possibility of developing an acceptable drilled well; The area around infiltration lines shall be under the control of the water purveyor for a distance acceptable to the reviewing authority; Flow in the lines shall be by gravity to the collecting well; Water from infiltration lines shall be considered as. The inlet of a booster pump shall be at a minimum pressure of 140. Region. descriptions of feed equipment, including maximum and minimum feed ranges; location of feeders, piping layout and points of application; operating and control procedures including proposed application rates; descriptions of testing equipment and procedures. No chemicals shall be applied to treat drinking water unless specifically permitted by the reviewing authority. Conditioning will increase the. The tower can be constructed of stainless steel, concrete, aluminium, fibreglass or plastic. The concrete pad shall extend a minimum of 0.6 metres beyond the location of the fuel tank fill pipe. Pipes and contact materials must be resistant to the aggressiveness of salt. A plant flow diagram which shows the location of all critical features, alarms and automated controls to be provided. Inlet Devices - inlets shall be designed to distribute the water equally and at uniform velocities. A moderate drought is considered to be a 7-day period of stream flow so low that only with an average frequency of once in ten years would the flow, or regulated flow, be as low. As an allowance of a safety factor, the contact time determined by the test shall be increased by 10%. As noted in the title of the source document, these Standards, better known as the 10- State Standards, were last updated in 2003. All devices shall be designed with: Air scouring can be considered in place of surface wash: Provisions shall be made for washing filters as follows: Roof drains shall not discharge into the filters or basins and conduits preceding the filters. As such, for certain projects, the First Nations may have to consider hiring an outside certified contractor to operate the system and train First Nation members to a certified status. a cover, unless it can be demonstrated that it is not a problem for filter cleaning or operation of the plant; headroom to permit normal movement by operating personnel for scraping and sand removal operations. A pilot plant will be necessary to determine the optimum form of treatment to be applied to site specific water, a complete protocol of the pilot work must be developed and submitted to the reviewing authority before the pilot work and testing commences. 4.3.5.2Forced or Induced Draft Aeration. Only ion-exchange softening will be considered and where approved by the reviewing authority. Openings must be provided with raised curbs and watertight covers having overlapping edges similar to those required for finished water reservoirs; Overflows, where provided, must be protected with corrosion resistant screens and must terminate with either a turned down bend having a proper free fall discharge or a self-closing flap valve; Two wet salt storage tanks or compartments designed to operate independently should be provided; The salt shall be supported on graduated layers of gravel placed over a brine collection system; Alternative designs which are conducive to frequent cleaning of the wet salt storage tank may be considered. But, this document is updated and revised as necessary to suit the requirements and needs of First Nations communities. The process produces a concentrated waste stream in addition to the clear permeate product. In locating waste disposal facilities, due consideration shall be given to preventing potential contamination of the raw water supply. 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. Adsorption by powdered activated carbon (PAC). Filters following pressure aeration must have adequate exhaust devices for release of air. Sedimentation shall follow flocculation. Equipment containing mercury may not be connected to any liquid system within a water treatment plant where it is possible that mercury may escape into water which subsequently is delivered to consumers. Cold water performance, flux rates, pressure, power and waste treatment requirements should be investigated. Final design drawings and contract documents (See 1.3 and 1.4). Continuous disinfection is required for all water supplies. The chlorine solution injector/diffuser must be compatible with the point of application to provide a rapid and thorough mix with all the water being treated. A manual override shall be provided on all automatic controls. When bolted or welded steel tanks are used the tank supplier shall make provisions for cleaning the tanks. The testing shall use the same limestone as proposed for the full scale limestone contactor. This process consists of a continuous chlorine or other approved oxidizing agent to the influent of a silica sand/manganese coated media filter. Formation of THMs is dependent on such factors as amount and type of chlorine used, temperature, concentration of precursors, pH, and contact time. The discharge piping shall be provided with a means of pumping to waste, but shall not be directly connected to a sewer; The discharge piping (or any other piping that is in contact with the drinking water) should not be galvanized steel. Pre-treatment is strongly recommended. The final plan must identify and address any problems and alarms that occurred during the demonstration period. A minimum of two clearwell compartments shall be provided. For values between 10 and 100, PTA may be feasible but should be extensively evaluated using pilot studies. It should be noted that particulate counting is a 'snap shot' in time and that there can be seasonal variations such as algae blooms, lake turnover, spring runoff, and heavy rainfall events that will give varied water quality. without coagulation pre-treatment, the nominal rate may be 0.1 to 0.3. without coagulation pre-treatment the nominal rate may be somewhat higher when demonstrated to the satisfaction of the approving authority; with coagulation pre-treatment the maximum permissible rate of filtration shall be 0.1. at design maximum day demand the time period between scraping should be at least one month during the worst water quality conditions. Careful selection of materials compatible with the physical system or the water being delivered can aid in reduction of corrosion product production. Sturdy, weatherproof, locking hardware must be included in the design of access for all tanks, vaults, wells, well houses, pump houses, buildings, power stations, tra, Computer based control technologies such as, Facilities and procedures for delivery, handling and storage of chemicals should be designed to ensure that chemicals delivered to and used at the facility cannot be intentionally released, introduced or otherwise used to debilitate a water system, its personnel, or the public. be constructed of materials resistant to damage by chemical action of groundwater or cleaning operations (stainless steel); have size of openings based on sieve analysis of formation and/or gravel pack materials; have sufficient length and diameter to provide adequate specific capacity and low aperture entrance velocity. We also coordinate Ontarios actions on climate change in the name of healthier communities, ecological protection and economic prosperity. Protective equipment, including emergency eyewash facilities, shall be provided, and shall meet the requirements of the Workers' Compensation Board. Pressure aeration devices shall be designed to: Packed tower aeration (PTA) which is also known as air stripping involves passing water down through a column of packing material while pumping air counter-currently up through the packing. In selecting the source of water to be developed, the designing engineer must prove to the satisfaction of the reviewing authority that an adequate quantity of water will be available, and that the water which is to be delivered to the consumers will meet the "Guidelines for Canadian Drinking Water Quality" Latest Edition, published by Health Canada. Slow sand gravity filters shall be so designed as to provide: The permissible rates of filtration shall be determined by the quality of the raw water and shall be on the basis of experimental data derived from the water to be treated; 4.3.2.3.8. The reviewing authority must specifically approve any variance from the requirements of Sections 8.7.2 and 8.7.3 when it is impossible to obtain the specified separation distances. Provisions must be made for proper disposal of water treatment plant wastes, such as sanitary, laboratory, clarification sludge (aluminum hydroxide), ferrous hydroxide sludge, filter backwash water and brines. All well caps, temporary or permanent, shall be effectively located/sealed against the entrance of water and contaminants; at all times during the progress of wok, the contractor shall provide protection to prevent tampering with the well or entrance of foreign materials. In order to keep interested parties informed of changes to the Guidelines between publication of new editions, a summary table entitled "Summary of Guidelines for Canadian Drinking Water Quality" is updated and published every spring on Health Canada's website . Consideration should be given to innovative technology where there is sufficient demonstration of treatment effectiveness and contract provisions to protect the water supplier should the treatment not perform as claimed. (See 2.2, 2.15, 2.18 and 2.19). All types of installed pipe shall be pressure tested and leakage tested in accordance with the latest edition of AWWA Standard C600. Specifications shall incorporate the provisions of the AWWA standards and/or manufacturer's recommended installation procedures. Ensure that accurate test equipment is available to readily measure and record arsenic levels in the raw and treated water. Separation of sewer and water services from the main to the house should meet regional procedures. Check detention time at various flow rates particularly cold water conditions. Contact Time - a minimum 60 minute actual contact time is recommended. For the purpose of this document, a raw water supply which is groundwater means water located in subsurface aquifer(s) where the aquifer overburden and soil act as an effective filter that removes micro-organisms and other particles by straining and antagonistic effect, to a level where the water may already be potable. Automated periodic back flushing and cleaning is employed on a timed basis or once a targeted transmembrane pressure differential has been reached. Removable silt stops should be provided. Cleaning the Membrane: The membrane must be periodically cleaned with acid, detergents and possibly disinfection. 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. North York Rangers Aaa Coaches, Fid Bkg Svc Llc Moneyline, United Airlines Drug Testing Policy, Articles M. Techne by 1937 rolls royce phantom value. Pipe and joint materials which are not subject to permeation of the organic compounds shall be used. Detention Time - shall provide a minimum of four hours of settling time. Corrosion of metallic pipes is a chemical oxidation process, which requires that both water and an oxidizing agent be present at metal surfaces. An engineering report shall be developed as the first step in the process leading to design of the automation system. In addition to the preceding standards the following shall apply for distribution system storage: The minimum pressure during peak hourly demand in the distribution system shall be 275 kPa. Other treatment plant storage tanks/basins such as detention basins, backwash reclaim tanks, receiving basins and pump wet-wells for finished water shall be designed as treated water storage structures. Designated vehicle areas such as parking lots and drives should be separated from critical assets with adequate standoff distances to eliminate impacts to these assets from possible explosions of material in vehicles. sodium hypochlorite shall be stored in the original shipping containers or in sodium hypochlorite compatible containers; storage containers or tanks shall be sited out of the sunlight in a cool area and shall be vented to the outside of the building; wherever reasonably feasible, stored hypochlorite shall be pumped undiluted to the point of addition. The vent shall terminate in a down-turned position, at or above the top of the casing or pitless unit in a minimum 40 mm diameter opening covered with a #16 mesh, corrosion resistant (usually stainless steel) screen. The drain shall be constructed to not allow short circuiting of raw or pre-treated water to the filter under-drain; the walls of the filter box shall be configured to prevent short circuiting of flow between the media and the walls; provisions to permit filtered water (from another filter unit) to flow slowly upwards at a maximum rate of 0.1. provisions for a temporary hose connection between the outlet of the pretreatment unit or raw water source and the outlet side of filters to permit water to flow slowly upwards from the bottom, through the drainage system and the gravel and sand bed, during plant start-up operation; provisions for draining each filter tank; a continuous, relatively uniform flow of water through the filter; a valve to control rate of raw water into the supernatant water reservoir; a valve capable of accurately controlling the rate of filtration; an effluent pipe designed to maintain the water level above the top of the filter sand; construction to prevent cross connections, and common walls, between potable and non-potable water. (See 3.2.1). The well construction report and the reporting requirements form must be submitted to the comptroller within 90 days after the well completion date; on the permanent closure of a well, a person engaged in that work must remove any existing well identification plate, complete the well closure report form specified by the comptroller, and return the well identification plate and report form to the comptroller within 90 days after the work is complete; maintain and safeguard the well identification plate from any physical damage; ensure that the well identification number set out on the well identification plate remains plainly visible; report any missing or damage well identification plate to the comptroller; . Special attention shall be given to assure that the grouting and casing are not damaged by the blasting. Download: Guide to amend drinking water works permits, Download: Application form to amend drinking water works permits. Uncoated carbon steel is not recommended because of corrosion. The chlorination system must be able to provide a free chlorine residual of at least 2 mg/L once all demands are met after a contact time of at least 30 minutes under anticipated maximum chlorine demand conditions. Security measures are needed to help ensure that public water suppliers attain an effective level of security. Liquid chemical feeders shall be such that the solution cannot be siphoned into the water supply, by: Cross-connection control must be provided to assure that: In-plant water supply (if required) shall be: Chemical shipping containers shall be fully labelled to meet MSDS standards to include: Chemicals shall be approved by the reviewing authority or meet the appropriate ANSI /AWWA standards and/or ANSI/NSF Standard 60. This will allow the pumps to operate more effectively during the low flows the plant will experience during the initial years of plant operation. These conditions pertain to raw water without coagulation pre-treatment. Plant staff must perform, as a minimum, weekly checks on the communication and control system to ensure reliability of operations. Provide a preliminary process control schematic. Water mains must be separated from sewers by a minimum horizontal distance of 3, The minimum pipe diameter for water services shall be 25, Pipe, fittings, valves, and fire hydrants shall conform to the latest standards issued by the. If contacted, the First Nations Internal Health Board will provide colilert equipment and the necessary reagents free of charge to all First Nation communities. Typical approval authorities would include but not limited to the following: Water quality is protected by controlling runoff into the reservoir; Dykes are structurally sound and protected against wave action and erosion; Intake structures and devices meet requirements of Section 3.1.3.1; Point of influent flow is separated from the point of withdrawal; Separate pipes are provided for influent to and effluent from the reservoir. Particular attention should be given to the selection of backfill material in relation to the collector pipe slot size and graduation of the native material over the collector system. The filtration and backwash rates shall be monitored so that the pre-filters are being optimally used. Learn more about the establishment, alteration or operation of a drinking water system in these technical bulletins: Ontarios Drinking Water Quality Management Standard - Pocket Guide, Taking Care of Your Drinking Water: A Guide for Members of Municipal Councils, 2019-2020 Chief Drinking Water Inspector annual report, Making changes to supervisory control and data acquisition systems in municipal residential drinking water systems. Laboratory test kits which simplify procedures for making one or more tests may be acceptable. Space shall be provided adjacent to the chemical rooms for expansion if required; Liquid alum and sodium hydroxide shall not be handled from open vessels, but may be pumped in undiluted form from the original container by a suitable transfer pump and corrosion resistant hose to the point of application or to a covered day tank; Day tanks shall be of corrosion resistant material such as. 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