mecp design guidelines for drinking water systems
Where a well pumping station and chlorine and/or chemical system is to be installed, the preferred layout is for a three-room building which includes a separate chlorine or chemical room, pump room and electrical room. Gravel - gravel, when used as the supporting media shall consist of cleaned and washed, hard, durable, rounded silica particles and shall not include flat or elongated particles. All types of installed pipe shall be pressure tested and leakage tested in accordance with the latest edition of AWWA Standard C600. Any virus removal credit must also be documented through an appropriate piloting process.
exhaust fans and dust filters which put the hoppers or bin rooms under a slight negative pressure. Challenge testing of each critical component of the overall system must be included as part of the demonstration project. Mechanical flocculation may be used only after consultation and approval from the reviewing authority; Piping - flocculation and sedimentation basins shall be as close together as possible. Automatic regeneration based on volume of water softened should be used unless manual regeneration is justified and is approved by the reviewing authority. Review intake structure design to ensure compliance with 3.1.3. Each pump shall have a positive-acting check valve on the discharge side between the pump and the shut-off valve. Where systems serve widely scattered customers and where future development is not expected the valve spacing should not exceed 1,800 m. A rock plate should be installed on valve riser stem at a distance of 300 mm below ground surface. At crossings, one full length of water pipe shall be located so both joints will be as far from the sewer as possible. Static mixers are the preferred type of flash mix, provide water flushing feature and include in design provision for minimum flows during early operation of plant. Any proprietary compound must receive the specific approval of the reviewing authority before use. When a groundwater supply has replaced a surface water supply as the source of water, then the old surface water supply must be physically disconnected from the water system. North York Rangers Aaa Coaches, Fid Bkg Svc Llc Moneyline, United Airlines Drug Testing Policy, Articles M. Techne by 1937 rolls royce phantom value. All piping 50 mm in diameter or smaller is recommended to be AISI 316 or 416 stainless steel. You need to take water samples from these 2 sources: You must obtain permission from the owner of the property before testing. Laboratory equipment selection shall be based on the characteristics of the raw water source and the complexity of the treatment process involved. Emergency Response Plan required (See 1.9). Have floors sloped to permit removal of water and accumulated solids; Be covered or otherwise protected against contamination. This section describes the desired content of the Operation and Maintenance Manual herein referred to as the Manual. drinking-water systems that obtain water from a raw water supply that is ground water under the direct influence of surface water: A drinking-water system that obtains water from a well that is not a drilled well or that does not have a watertight casing that extends to a depth of at least 6 metres below ground level. The overflow shall discharge by gravity with a free fall at a location where the discharge will be noted; Superstructure - a superstructure over the sedimentation basins may be required. Comprehensive as-built drawings of the system; where a groundwater supply has replaced a surface water supply, the disconnection of the existing surface water supply from the water works must be clearly recorded on the as-built drawings; For each lot provide a sketch with dimensions to dwellings, poles, hydrants. The capacity of the replacement feeder pumps would increase until the plant design capacity has been reached. Membrane Selection: Two types of membranes are typically used. Include a blower with a weatherproof motor in a tight housing and screened enclosure; Insure adequate counter current of air through the enclosed aerator column; Exhaust air directly to the outside atmosphere; Include a down-turned and 24-mesh screened air outlet and inlet; Be such that air introduced in the column shall be as free from obnoxious fumes, dust and dirt as possible; Be such that sections of the aerator can be easily reached or removed for maintenance of the interior or installed in a separate aerator room; Insure that the water outlet is adequately sealed to prevent unwarranted loss of air; Discharge through a series of five or more trays with separation of trays not less than 150. The feasibility study shall also include the following general information identified below. endstream endobj startxref A natural or forced draft air system may be used. A full scale direct filtration plant shall not be constructed without prior pilot studies which are acceptable to the reviewing authority. %%EOF Totalizing metres must be installed in the bypass line and on each softener unit.
For groundwater ensure that water is not under the direct influence of surface water, if there is the slightest doubt of surface contamination, such as an unconfined aquifer, close proximity to a lake or river or the presence of surface microbiological biota in the groundwater then treat as surface water. Ambient water quality guidelines are used to: Webmecp design guidelines for drinking water systems. Facility layout shall consider critical system assets and the physical needs of security for these assets. However, initiation of this practice will depend on obtaining approval from the owner of the sewerage system as well as from the regulatory agency before final designs are made. The final plan must identify and address any problems and alarms that occurred during the demonstration period. Maximum flood flow, together with approval for safety features of the spillway and dam from the appropriate reviewing authority; Description of the watershed, noting any existing or potential sources of contamination (such as highways, railways, chemical facilities, sanitary wastes, landfill sites. The Design Guidelines for Drinking-Water Systems were prepared under the guidance of the Ontario Ministry of the Environment (MOE) Drinking Water It should be impossible for any vehicle to be driven either intentionally or accidentally into or adjacent to finished water storage or critical components without facility involvement. The pressure gauge will serve as an indicator of fouling buildup; a backup motor for the air blower must be readily available. The building for well pump installation with chlorine or other chemical feed system should consist of three separate rooms accommodating process piping, electrical equipment and chemical storage and feed equipment. The reject volume should be evaluated in terms of the source availability and from the waste treatment availabilities. The following three chemicals should be considered as being suitable to add fluoride ion to a drinking water supply: 5.7.7.1Sodium Fluoride and Sodium Silicofluoride.
Outdated browsers lack safety features that keep your information secure, and they can also be slow. In those cases where a pumper outlet may be required, the pumper outlet diameter shall match the pumper suction inlet diameter. The following parameters should be monitored: A review of historical source raw water quality data, including turbidity and/or particle counts, seasonal changes, organic loading, microbial activity, and temperature differentials as well as other inorganic and physical parameters should be conducted. Space should be provided adjacent to the chemical rooms for expansion if required; A bag splitter, storage hopper, volumetric feeder and solution tank shall be used to make down a 5% to 10% slurry; A manual make down system may be used as approved by the reviewing authority; Ventilation shall comply with the applicable Workers Compensation Board requirements; Where polymers are used as a coagulant or filter aid a separate room shall be provided for storage and feed equipment; Liquid polymers are preferred over dry granular materials; Polymers may be anionic, cationic, or non-ionic depending on the water treatability tests; Neat polymer solution shall be fed into specifically designed mixing and dilution equipment for direct application to the feed points; Dilution rates shall be in strict accordance with the chemical supplier's recommendation; Polymer shipping containers shall be stored in contained areas; Sufficient storage shall be provided for 30 days use at average day flows at the ten-year design horizon at the estimated average dosage; Ventilation shall comply with the applicable Workers' Compensation Board requirements; Calibration tubes shall be installed on each polymer metering pump to permit regular testing of metering pump output; Flow meters shall be installed on dilution water lines to the polymer makedown system; A check and ball valve assembly shall be installed at the point of chemical application; Feed rates shall be paced on flow with manual dosage adjustment; All storage tanks shall be stored in contained areas; 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; Calibration tubes shall be installed on each, Metering pumps shall be compatible with the specific. Iron and manganese control: Iron and manganese removal will be required if the iron and manganese levels exceed 0.3, Recommended oxidizing methods are aeration and the use of strong oxidizers such as sodium hypochlorite. Special provisions shall be made for ventilation of chlorine feed and storage rooms to meet the BC Workers' Compensation Board requirements. Detailed analysis of operation & maintenance cost for all options, including the requirement for a certified operator. All rooms, compartments, pits and other enclosures below ground floor; Any area where unsafe atmosphere may develop or where excessive heat may be built up. Check to ensure flushing lines, drains and sludge disposal features are included in the design for flocculators and clarifiers. Where necessary, dykes, deflecting gutters or other means of diverting surface water so that it does not flow into the lagoon; A minimum of two cells, each with appropriate inlet/outlet structures to facilitate independent filling/dewatering operations. 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. The pilot plant filter must be of a similar type and operated in the same manner as proposed for full scale operation. every well shall be developed to remove the native silts and clays, drilling mud or finer fraction of the gravel pack; development should continue until the maximum specific capacity is obtained from the completed well; where chemical conditioning is required, the specifications shall include provisions for the method, equipment, chemicals, testing for residual chemicals, and disposal of waste and inhibitors; where blasting procedures may be used, the specifications shall include the provisions for blasting and cleaning. No overflow may be connected directly to a sewer or a storm drain. Provide the ability to modify the size of screen openings after plant start-up if required; Contact Time - a minimum 60 minute actual contact time is recommended. The plant control system must have the capability for manual operation of all treatment plant equipment and process functions. The 3.2.4.5Permanent Steel Casing Pipe shall, 3.2.4.6Polyvinyl Chloride Plastic (PVC) Well Casing. When a naturally safe groundwater source is not available, or the system owner wishes to provide UV treatment for other reasons, the following criteria shall be considered. At least two arsenic removal treatment processes must be piloted to determine the optimum form of treatment. 3.2.1 Water Source, Quality & Quantity In selecting the source of water for a drinking-water system, the designing engineer should ensure that an adequate quantity of water will be available and that the treated water will meet the Ontario Drinking-Water Quality Standards Regulation Storage facilities shall have sufficient capacity, as determined from engineering studies, to meet domestic demands (equalization), emergency demands, and where fire protection is provided, fire flow demands. Adsorption media once spent will be replaced and not generated, the spent material shall be disposed of in suitable landfills with the approval of the reviewing authorities. Treatment of surface water should include source water protection, filtration, and disinfection. The underdrains shall be so spaced that the maximum velocity of the water flow in the under-drain will not exceed 0.25, the lateral drains should consist of slotted. Accder aux paramtres de votre navigateur. The concrete pad shall extend a minimum of 0.6 metres beyond the location of the fuel tank fill pipe. Web(updated) MECP design criteria. 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. Children up to 6 years old are more sensitive to the effects of lead because they are still developing and their bodies can absorb it more easily than adults. A modified rate controller which limits the rate of filtration to a maximum rate may be used. At the same site, estimate the relative degree of corrosivity on a routine basis by using desktop analyses or corrosion indices such as the Langelier Index, Ryznar Index, calcium carbonate precipitation potential or Aggressiveness Index (. But, this document is updated and revised as necessary to suit the requirements and needs of First Nations communities. The process shall provide a level of treatment which achieves at least 4-log (99.99%) inactivation or removal of viruses. A plant flow diagram which shows the location of all critical features, alarms and automated controls to be provided. The inlet of a booster pump shall be at a minimum pressure of 140. The quantity of water at the surface water source shall: A sanitary survey and study shall be made of the factors, both natural and man made, which could affect quality. Additional guidance is available in Section 2 of Ontario Regulation 170/3, and the document entitled "Terms of Reference - Hydrogeological Study to Examine Groundwater Sources Potentially Under Direct Influence of Surface Water" - Latest Version, Province of Ontario, and Section 2 of the document entitled "Guidance Manual for the Surface Water Treatment Rule", USEPA. (See Policy Statement on Security for more details). Contact Time - the required contact time is dependent on the quality of limestone used, and the. Corrosion of metallic pipes is a chemical oxidation process, which requires that both water and an oxidizing agent be present at metal surfaces. Operation costs shall include an estimate for heat (fuel) and electricity; Operation and maintenance of wastewater disposal systems from water treatment processes; Laboratory procedures; daily, weekly, monthly and annual testing; The estimated normal useful life of new assets and their major components be established and recorded so that there is a clear understanding and record of the expected timing and nature of major repairs, overhauls and replacements; Provincial and/or federal Permits if required. All internal parts of the fan and ducting should be coated with a chlorine rubber compound or other suitable material to withstand the corrosive effects of the acid; Concrete floors and walls up to one metre above the floor level should be coated a an approved epoxy coating able to withstand the corrosive effects of the acid; Special attention shall be given to electrical components that are mounted in the acid room with respect to sealing, purging the panels and materials selected. The only allowable openings are vents, manholes, overflows, risers, drains, pump mountings, control ports, and piping for inflow and outflow (See 7.10). Where removal is not possible or practical, the casing shall be withdrawn at least 1.5 metres to ensure grout contact with the native formation. The Manual should include the information listed below if applicable: The following shall be srepared by the First Nation's professional consulting engineer and submitted as part of the project deliverables when requesting funds for the construction phase: No longer than two months following final commissioning, the following shall be prepared by the First Nation's professional consulting engineer: A complete, detailed Emergency Response Plan shall be supplied for the proposed project, along with the final design documents. Describe previous water quality problems including any boil water orders if applicable. Water seals shall not be supplied with water of a lesser sanitary quality than that of the water being pumped. Tank Design - the tank geometry will minimize the wall area to tank volume ratio and minimize short circuiting. 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. Automatic chlorine residual recorders should be provided where the chlorine demand varies appreciably over a short period of time; All treatment plants having a capacity of 2. At the beginning of each filter cycle and/or after every backwash of the pre-filters a set amount of water should be discharged to waste before water flows into the bag/cartridge filter. For distribution of water uniformly over the top tray; Discharge through a series of three or more trays with separation of trays not less than 300. Critical components that comprise single points of failure (, Human access should be through controlled locations only. As a minimum, the following laboratory equipment shall be provided: Sufficient bench space, adequate ventilation, adequate lighting, storage room, laboratory sink, and auxiliary facilities such as an eyewash and deluge shower unit (in accordance with WCB requirements) shall be provided. Special consideration should be given to distribution main sizing, providing for design of multidirectional flow, adequate valving for distribution system control, and provisions for adequate flushing. the filter sand shall be underlain by graded support gravel layers to prevent migration of the filter sand; the support gravel system shall be built of various layers ranging from fine grain at the top to coarse grain at the bottom; each gravel layer shall be graded such that the 10% and 90% passing diameters shall differ by a factor of not more than 1.41; the upper layer of gravel must be selected with a d10 value more than four times greater than the d15 value of the coarsest filtration sand and less than four times greater than the d85 value of the finest filtration sand proposed to be used; each successive gravel layer shall be graded so that the d10 particle diameters are not more than four times smaller than those of the layer immediately below; the diameter of the smallest particle within the last gravel layer shall be at least two times greater than the slot size opening in the under-drainage system; the thickness of each gravel layer shall be at least three times the diameter of the largest stone in its grading, but for practical purposes a minimum thickness of the layers shall be 50. the support gravel shall be hard, rounded, with a specific gravity of at least 2.5, and should be free from silt, clay loam, and organic impurities of all kinds.