Santa Clara County Municipal Code Part 6 Domestic Water System

Every lot in a subdivision shall be supplied with water for domestic purposes from a source and/or system which meets applicable state laws and Chapter VI of Division B11. Drilling of any new well or exploratory hole, and abandonment of any old well, must be done under a permit issued by the Santa Clara Valley Water District, in accordance with District Ordinance 75-6.

(Ord. No. NS-1203.35, § 4, 3-13-78)

When the water supply is to be from an existing approved domestic water system not under the ownership or control of the subdivider, the subdivider shall furnish evidence of agreements showing availability of the public water systems to serve the subdivision.

(Ord. No. NS-1203.35, § 4, 3-13-78)

When a subdivider proposes that each lot in the subdivision will be supplied water by means of wells, each well shall be developed by the subdivider according to the requirements of Chapter VI of Division B11 and the Santa Clara Valley Water District. Abandonment of wells shall be done only with a permit from the Santa Clara Valley Water District as provided in District Ordinance 75-6.

(Ord. No. NS-1203.35, § 4, 3-13-78)

(a) Any water system serving a subdivision shall be designed and constructed for both domestic water, in accordance with the requirements of Chapter VI of Division B11, and fire protection requirements in accordance with the provisions of this chapter.

(b) If the water system for the subdivision is not a existing public domestic water system operating under a valid permit, the subdivider shall furnish a detailed report, prepared by a registered civil engineer, which will confirm that the water system and fire protection facilities will comply with all the requirements of Chapter VI, Division B11, and this chapter. This report shall be prepared and approved prior to commencing any new water system improvements required by the Board of Supervisors and prior to recording the final map or parcel map. The water system and any fire protection facilities required by the Board of Supervisors shall be shown on the street improvement plans or on separate plans. The County Surveyor, the County Health Officer and the agency providing fire protection to the subdivision shall review the improvement plans and any report pertaining to water supply and fire protection facilities to determine if they conform to County standards and the requirements of the Board of Supervisors.

(c) The subdivider shall enter into an agreement with the Board of Supervisors requiring the work be completed prior to the occupancy of any homes to be constructed within the subdivision, but not more than one year after the filing of the final map or parcel map or such greater period of time as may be specified in the agreement. The agreement shall provide for inspection services. It may provide for the improvements to be installed in units, or for the extension of time under specified conditions. The agreement shall be secured by a good and sufficient improvement security. Construction inspection and plan check fees shall be a specified in this chapter.

(Ord. No. NS-1203.35, § 4, 3-13-78; Ord. No. NS-1203.45, § 14, 7-2-79)

(a) All facilities of the water system shall be designed and constructed to withstand, with ample safety factors, the physical stresses to which they will be subjected and shall be free from structural or sanitary hazards. All equipment shall be of adequate size and capacity and be correlated with available supply from storage to meet the requirements of this section. Whenever feasible, the individual water source units shall be of such capacity that an outage of any single unit during a period of peak demand will not result in reduction of supply in the distribution system below the requirements of this section.

(b) The quantity of water delivered to the distribution system from all sources' facilities must be sufficient to supply adequately, dependably and safely the total water requirements of all consumers under maximum consumption.

(1) One hundred to 200 service connections. The combined capacities of all source facilities at periods of maximum demand shall support a rate of flow to the distribution system for two hours or not less than

Q = 100 + F √N

where "Q" equals the rate of flow in gallons per minute delivered from the combined source facilities to the distribution system, and "F" is a factor equaling 25, and "N" equals the total number of customer units where each unit is equivalent to one for a single family dwelling. Other types of development shall be assigned appropriate customer unit values as experience within the distribution system or locality indicates.

EXAMPLE:

(2) Under 100 service connections. The source shall provide 1,000 gallons per day per service connection.

Distribution storage shall be provided at the rate of 500 gallons per service connection for the first 20 service connections and, in addition, 250 gallons per service connection for each service connection in excess of 20.

Distribution piping shall be able to handle a flow during the peak hour equivalent to 20 percent of the total daily design consumption. The minimum storage and distribution requirements for culinary purposes (not including fire protection) shall be as shown in the following table:

For the purpose of these minimum requirements, the source shall be considered as made up of the source facilities, the transportation facilities and all appurtenances thereto. The capacities set forth above shall be increased as necessary to provide the capability for fire protection, meeting adopted County standards.

(Ord. No. NS-1203.35, § 4, 3-13-78)

(a) Transportation facilities consist of the equipment and appurtenances which provide the means of delivering water to the distribution system from the source facilities. Reservoirs and tanks from which the water is delivered directly into the mains of the distribution system where not adequately protected against pollution or completely covered shall have facilities for the installation of equipment to disinfect water.

(b) Pumping equipment delivering water to the distribution system shall, in conjunction with the storage facilities, be so designed as to meet the requirements of this section. Each pumping unit shall be driven by a separate power unit of adequate size. Construction shall be such as to prevent sanitary hazard or structural defects whether the pumping unit is handling raw or treated water. All piping in the source facilities shall be of adequate size to carry the required quantities of water with reasonable velocities. No pipe conveying contaminated water prior to treatment shall be connected to pipe carrying potable water. Master meters or other suitable measuring devices shall be provided to register accurately the quantity of water delivered to the distribution system. Housing for all equipment appurtenances, and other facilities, shall provide adequate ventilation and protection against unauthorized entry. Ample space for the performance of all operating, maintenance and repair functions shall be provided.

(Ord. No. NS-1203.35, § 4, 3-13-78)

(a) The distribution system shall be of adequate size and so designed in conjunction with related facilities to maintain a minimum pressure of 20 pounds per square inch at every point during periods of maximum normal demand. The maximum length of run of each size of pipe shall in no case be greater than the following:

In unreinforced runs serving culinary water purposes only (dead-ends) none smaller than two-inch in diameter; two-inch and three-inch in diameter—300 feet; four-inch in diameter—1,300 feet; six-inch in diameter—2,600 feet.

In reinforced runs (connections at both ends of runs) none smaller than two-inch; two-inch and three-inch in diameter—600 feet.

Dead-end runs shall be provided with means of flushing to prevent deterioration of water quality. Completion of a grid system is required wherever feasible.

Materials used in the distribution system shall be able to withstand with ample safety factors, all internal and external forces to which they may be subjected.

(b) The type, minimum class or gauge and standards for pipe and valves used in the distribution system shall be as set forth in this section.

Cast-iron pipe, two-inch, Class 250, shall conform to the applicable requirements of Federal Specification WW-P-421.

Cast-iron pipe, three-inch up to and including 12-inch, Class 150, shall conform to the applicable requirements of Federal Specifications WW-P-241, or American Standards Association A-21. Copper pipe, two-inch and three-inch, shall conform to Standard Specifications for Copper Water Tubing of the American Society for Testing Materials, Designation B 88-46.

Steel pipe, two-inch and three-inch, shall conform to the applicable American Society for Testing Materials Standards Specifications and Steel Pipe.

Asbestos cement water pipe, Class 150, commercial designation, to and including 12-inch.

Steel pipe, four-inch, six-inch, eight-inch 12 gauge, ten-inch and 12-inch 10 gauge, shall conform to the applicable requirements of American Water Works Association Tentative revision of Standard Specifications for Steel Water Pipe of sizes up to but not including 30-inch, No. 7A. 4-1941-TR.

All steel pipe at the time of installation shall be adequately protected inside and out against corrosion. Pipe that has been used for any purpose other than for transporting potable water shall not be used without previous effective decontamination.

Gate valves shall conform to the American Water Works Association Standard Specifications for Gate Valves for Ordinary Water Works Services.

Service pipe and fittings shall be designed for cold water working (non-surge) pressures of not less than 150 pounds per square inch. Pipe from the distribution line to the customer connection shall be of cast iron, copper or galvanized steel, or equivalent as approved by the County Surveyor.

All materials to be installed shall be new or approved by the subdivider's engineer as having a life expectancy substantially equal to new materials.

Lesser or higher requirements may be imposed by the County Surveyor when the water system improvements are within an existing or proposed service area of a city or public utility that may incorporate the facilities into its water system at a future date. Such requirements shall be in accordance with the standards of the city or utility.

(Ord. No. NS-1203.35, § 4, 3-13-78)