19D.130.040 General Provisions.
A. Source Development. New sources must be designed to meet the State of Washington, Department of Ecology (DOE) and the Department of Health (DOH) regulations and design guidelines including Chapter 173-160 WAC, Minimum Standards for Construction and Maintenance of Water Wells, administered by DOE and the Tacoma-Pierce County Health Department (TPCHD), and Chapter 246-290 WAC, Group A Public Water Supplies, and Chapter 246-293 WAC as administered by DOH. All test and production wells must be drilled in accordance with detailed drilling and testing specifications in Chapter 173-60 WAC.
B. Water Rights. Water rights must be obtained in accordance with DOE regulations and procedures, and copies of water right documents, correspondence, and other records are to be maintained on file with the purveyor.
C. Water Quality. Water quality must be proven to conform with DOH criteria specified in Chapter 246-290 WAC and/or any additional requirements more stringently applied by the TPCHD.
D. Standards Incorporated by Reference. The standards listed below, or as modified by the appropriate authorities, are hereby incorporated by reference. Priority for application of these standards is in the order listed, but the most stringent of these shall apply. Except as otherwise superseded by the standards in this Section, these standards will apply to water system design, installation, modification, and operation.
1. Group A Public Water Supplies (Chapter 246-290 WAC).
2. "Water System Design Manual" (DOH Publication 331-123).
3. "Standard Specifications for Road, Bridge, and Municipal Construction," latest edition, published by the Washington State Department of Transportation (WSDOT)/American Public Works Association (APWA).
4. Standards of the American Water Works Association (AWWA).
E. General Material Specifications and Construction Standards. Construction within incorporated areas remain subject to municipal permitting requirements. All requirements of the permit shall become part of these specifications. Selection of materials and construction of water system facilities in Pierce County shall conform to the following, at a minimum:
FOR DISTRIBUTION FACILITIES EQUAL TO OR GREATER THAN FOUR INCHES IN DIAMETER;
1. Applicable county or municipal ordinance(s);
2. "Standard Specifications for Road, Bridge, and Municipal Construction," latest edition, as published by Washington State Department of Transportation (WSDOT/American Public Works Association (APWA); or
3. Standards of the American Water Works Association (AWWA); and
4. Polyvinyl-Chloride (PVC) pipe meeting the requirements of American Society of Testing and Materials (ASTM) D2241, with a maximum standard dimension ratio of 21.
FOR DISTRIBUTION FACILITIES LESS THAN FOUR INCHES IN DIAMETER;
1. Applicable County or municipal ordinance(s), and, if applicable;
2. "Standard Specifications for Road, Bridge, and Municipal Construction," latest edition, as published by WSDOT/APWA; or
3. Standards of AWWA.
Along County road rights-of-way in unincorporated areas, a purveyor must obtain a franchise to place or repair infrastructure within the right-of-way. The purveyor must also obtain a County right-of-way permit for each individual project within the right-of-way prior to construction.
F. Hydrostatic Pressure Test. A hydrostatic pressure leakage test shall be conducted in accordance with WSDOT/APWA Section 7-11.3(11) or AWWA C-600 specifications, and may be conducted by more stringent standards at the discretion of the purveyor.
G. Disinfection and Bacteriological Testing. All pipes, reservoirs, and appurtenances shall be flushed and disinfected in accordance with the standards of the Washington State Department of Health (DOH) Chapters 246-290 and 246-293 WAC.
H. Power Supply Reliability. In accordance with WAC 246-290-420 and per Section 5.11.1 of the DOH "Water System Design Manual," reliable power supply should be provided to all sources, pump stations, and treatment plants. Furthermore, for public water systems that do not provide minimum fire flows solely by gravity, the reliability requirements established in WAC 246-293-660 pertaining to pumping facilities shall be met.
I. Utility Interties. When planning for system improvements or extensions, specific locations, size, and alignment of major water lines, a purveyor shall incorporate consideration and coordination of emergency interties with adjacent water purveyors.
J. Flow Measurement. All connections to the water system must have a water meter. The purveyor may develop specific provisions regarding metering requirements for individual structures. If approved by the purveyor, domestic water consumption may be measured by a master meter for service to a complex, under single ownership, and where water utility line subdivision is impractical. Service lines providing fire flow may be required by the purveyor to be equipped, at a minimum, with a detector meter.
All new groundwater sources shall be provided with device for measurement of depth to water and total production. Installation of these devices is also recommended for existing groundwater sources. All new sources for which water treatment is included shall be provided with flow measurement devices.
K. Cross-Connection Control. Water purveyors are responsible for developing and implementing cross-connection control programs in accordance with WAC 246-290-490. The purveyor's responsibility for cross-connection control shall begin at the water supply source and end at the point of delivery to the customer. Cross-connections between the distribution system and a customer's system shall be eliminated or controlled through installation of approved cross-connection control devices that rely on either of the following:
1. Premises isolation as defined in WAC 246-290-010; or
2. Premises isolation and in-premises protection as defined in WAC 246-290-010.