Town of Willington, CT - Appendix 3 - Community Water Supply

APPENDIX 3 _ COMMUNITY WATER SUPPLY

SECTION 1. WATER SUPPLY

It is the intent in setting forth these requirements to utilize the standards and regulations of both the Connecticut State Department of Health and the Public Utilities Commission of the State of Connecticut, whenever applicable, as a basis for developing the criteria contained herein. All standards or minima defined and described below equal or exceed those required by regulating agencies and in no way are they intended to infringe upon or abrogate the authority of these agencies.

GENERAL REQUIREMENTS

a) If the use of a community water system is proposed, the subdivider shall submit with the preliminary layout evidence of inspection and approval of the well site by the Connecticut State Department of Health. See, also, Chapter III, Section 3(a)(ix) of these Regulations.

b) No Certificate of Use and Compliance shall be issued until the water system has been approved, all or in part, by the Planning and Zoning Commission or its designated agent, and final approval is given by the Connecticut State Department of Health and the Connecticut Department of Public Utilities Control.

c) Minor modifications to those portions of these requirements and criteria which do not fall under the jurisdiction of either the Connecticut State Department of Health or the Public Utilities Commission of the State of Connecticut may be made by the designated agent of the Commission. Major modifications to those portions of these requirements which do not fall under the jurisdiction of either the Connecticut State Department of Health or the Public Utilities Commission of the State of Connecticut may be made by to the Commission in accordance with Chapter X of these Regulations.

a) Community Well Supplies. Location, construction of facilities, selection of equipment, treatment requirements and all other aspects of community well supplies shall be in accordance with the Regulations as set forth by the Connecticut State Department of Health with the following qualifications or additions:

1) Any community well supply must have at least two (2) independent producing well systems, where a well system is defined as one or more wells with the associated pumping facilities.

2) Minimum yield from any well system must equal 0.35 gallons per minute per residence or dwelling unit in the subdivision served.

3) Any subdivision serving fifty (50) or more customers shall be required to have storage capacity of at least two hundred (200) gallons per customer exclusive of any water in any hydro-pneumatic tank supplying the system.

4) Any community supply serving up to and including one hundred (100) residences or dwelling units shall have the capacity to provide, through pumping or a combination of pumping and storage, a supply of one and one_half (1 1/2) gallons per minute per residence or dwelling unit continuously for eight (8) hours with a peak supply, dependent on the number of residences or dwelling units supplied as indicated on the enclosed graph for the time period indicated on the graph which corresponds to that supply rate.

5) Any community supply serving more than one hundred (100) residences or dwelling units must have the capacity to provide, through pumping or a combination of pumping and storage, a supply of one and one_half (1 1/2) gallons per minute per residence or dwelling unit for a continuous eight (8) hour period with a peak hour during that period equal to 2.0 gallons per minute per residence or dwelling unit in the subdivision served.

6) A minimum residual pressure of thirty (30) pounds per square inch shall be allowed at street level at any point in the water system under a condition of consumption equal to one and one_half (1~1/2) gallons per minute per residence or dwelling unit. A maximum pressure of one hundred twenty (120) pounds per square inch at street level shall be allowed at any point in the system under static (no flow) conditions.

7) In areas where fire protection is required by the Planning and Zoning Commission, a minimum system storage capacity of 150,000 gallons shall be required. A minimum fire flow rate of 1,250 gallons per minute shall be available at any point in the system from one or more hydrants at a residual pressure of twenty (20) pounds per square inch.

8) If not required by the Connecticut State Department of Health, the Planning and Zoning Commission may require an auxiliary source of power for at least one well system, as defined above, depending on such conditions as proximity to existing source(s) of power, availability of emergency power for the subdivision being supplied and overall concept of water supply to the subdivision.

9) Interconnection of any two (2) or more individual subdivisions supplied by community well supplies or the extension beyond the originally approved subdivision boundaries of any community well supply shall be made only with the approval of the Planning and Zoning Commission if, after interconnection, the new system created meets all appropriate requirements, regulations and design criteria of the Connecticut State Department of Health, the Public Utilities Commission of the State of Connecticut and those as set forth herein.

10) Whenever a gravity type storage tank exists as part of the community supply, provision shall be made to allow the use of water in such tanks for the filling of fire fighting tank trucks or similar apparatus. Design of these installations shall be made so that in no way will a vacuum or negative water pressure be exerted on the system and such that utilization of water from these tanks will produce a residual pressure of no less than twenty (20) pounds per square inch at any one point in the system. Design of all such facilities shall meet with the approval of the Planning and Zoning Commission or its designated agent.

b) Distribution System.

A. minimum nominal inside diameter will be eight (8") inches except in permanent cul_de_sacs where the minimum nominal inside diameter may be six (6") inches.

B. In areas where mains larger than the minimum are required to deliver flows at the above_described flows and pressures, main size will be determined by the Hazen_Williams formula.

O = C x A x R (0.63) x S (0.5_/) in which:

O = flow rate in cubic feet per second

A = cross_sectional area of pipe in square feet

R = hydraulic radius in feet

C = a friction coefficient. For all pipe material allowed in these Regulations, the value of "C" will be equal to 120.

S = slope of the energy line in feet per foot.

C. In areas where fire protection is required by the Planning and Zoning Commission, main sizes will be determined by utilization of the Hazen_Williams formula as defined above in conjunction with a flow rate equal to the sum of the domestic plus the fire flow requirements. Fire flow rates will be determined in accordance with guidelines as set forth in the Fire Protection Handbook published by the National Fire Protection Association.

D. Mains shall be located such that the center line of the pipe is offset ten (10') feet from the road center line and shall have a minimum cover of 4'_6". (See, Typical Section_Utility Location).

E. Easements for water mains outside of street lines shall be a minimum of thirty (30') feet wide. Definition of the easement shall include wording so as to allow inclusion of other utilities. The center line of the water main is to be installed ten (10') feet from one edge of the right_of_way.

F. Connection of new water systems to an existing system(s) if allowed, shall be made by the latest subdivider at his expense.

G. Materials to be employed for water mains include cast iron, cement_lined ductile iron, PVC and reinforced concrete.

H. Wherever possible, mains shall be interconnected in such a manner so as to allow water to reach any point in the system from more than one direction.

2) Location and Spacing of Gate Valves.

A. In long single lines the maximum distance between valves shall be eight hundred (800') feet.

B. At a tee, one branch off a main, there shall be two valves, one in the main and one in the branch.

C. At a cross, two branches off a main, there shall be three valves, one in each branch and one in the main.

D. At intersections, wherever possible, valves shall be located in the main at the point at which the main intersects the street line.

3) Anchorages. Thrust blocks or anchorage will be provided for all bends, tees, caps or plugs.

4) Air Release Valves. Air release valves shall be utilized where sound engineering practice dictates their installation.

5) Blow offs. Gated blow offs shall be provided at all dead ends and at sufficient locations in the system to allow drainage of the system or flushing for maintenance programs. No blow offs shall be installed in any manner so as to permit back siphonage into the distribution system. Hydrants, where required in the system, may be utilized for flushing.

A. Hydrants shall not be installed in any system which does not meet the storage and flow rate requirements as defined in Section a) 6) above.

B. Where hydrants are required, distance between them shall be from four hundred (400') feet to six hundred (600') feet depending on fire flow requirements and no building shall be more than three hundred (300') feet from a fire hydrant.

C. Minimum hydrant lead size shall be six (6") inches, and all leads shall be equipped with auxiliary gate valves for hydrant isolation.

D. Hydrants shall be marked in accordance with the recommendations of the National Fire Protection Association as set forth in their Fire Protection Handbook.

E. Hydrant location shall be in accordance with Plate No. 13, Standard Detail Hydrant Installation.

A. Responsibility for services, as included in this section, extend from the main to the street line.

B. The service pipe shall extend through that point on the customer's property line or the street line easiest of access to the utility from its distribution system and, where practicable, from a point at right angles to the existing distribution line in front of the premises to be served. Service lines shall not cross intervening property.

C. Minimum size for services shall be 3/4 inch.

D. Allowable material for services two (2") inches in diameter or less shall include only copper and plastic.

E. Curb stops are required and should be located out of the paved areas between the main and the street line as close as possible to the street line.

F. Services, like mains, shall have a minimum cover of 4'_6".

8) Records. Included with the submission of the as_built drawings shall be the following:

A. A card file on all valves installed in the system. Information contained on a card shall include date of installation, manufacturer, direction of opening, number of turns, size a section for comments and a sketch indicating its position in relation to two fixed objects.

B. A card file on all hydrants installed in the system. Information contained on a card shall include date of installation, manufacturer, size of hydrant, size of lateral and auxiliary valve, direction of opening, depth of bury, number and size of outlet nozzles, a section for comments and a sketch indicating the position of the auxiliary valve in relation to two fixed objects.

C. A card file on all services installed in the system. Information contained on a card shall include date of installation, size material, a section for comments and a sketch indicating the position of the curb stop in relation to two fixed objects.