DGWaterDetail6-4.3NOTES FOR: DOUBLE DETECTOR CHECK VALVE ASSEMBLY (DDCVA) INSTALLATION
1. INSTALLATION OF THE APPROVED BACKFLOW ASSEMBLY SHALL BE IN ACCORDANCE
WITH THE "ACCEPTED PROCEDURE AND PRACTICE IN CROSS-CONNECTION CONTROL"
MANUAL, OF THE CROSS-CONNECTION CONTROL COMMITTEE. PACIFIC N.W. SECTION
OF THE A. W.W.A., MAY 1990, 5TH EDITION MANUAL OR CURRENT ADDITION.
2. BACKFLOW ASSEMBLY MUST BE SELECTED FROM WASHINGTON STATE DEPARTMENT OF
HEALTH LIST OF BACKFLOW PREVENTION ASSEMBLIES APPROVED FOR INSTALLATION
IN WASHINGTON STATE, LATEST EDITION.
3. UPON INSTALLATION OF THE APPROVED BACKFLOW ASSEMBLY, (AND YEARLY
THEREAFTER), THE ASSEMBLY SHALL BE TESTED BY A WASHINGTON STATE CERTIFIED
BACKFLOW ASSEMBLY TESTER, WHO SHALL PROMPTLY FORWARD THE TEST RESULTS
T0: THE CITY OF YELM, WATER DEPARTMENT, PRIOR TO OCCUPANCY.
4. DOUBLE DETECTOR CHECK VALVE ASSEMBLY OS & Y GATE VALVES SHALL HAVE
SUPERVISED TAMPER SWITCHES.
5. ALL ELECTRICAL SHALL BE INSPECTED BY B7 A WASHINGTON STATE ELECTRICAL
INSPECTOR.
6. DDCVA MUST BE PURCHASED AS A UNIT. NO MODIFICATIONS TO ASSEMBLY ARE
ALLOWED.
7. WATER METER SHALL BE A ROCKWELL SR-2/CF OR AN APPROVED EQUAL,
READING IN CUBIC FEET.
8. PIPE SUPPORTS SHALL BE RUST-PROTECTED WITH ALUMINUM PAINT.
9. THE FIRE DEPARTMENT CONNECTION SHALL BE LOCATED WITHIN 15 FEET OF A
FIRE HYDRANT BU7 NOT LESS THAN 10 FEET.
10. WHEN DDCVA IS LOCATED WITHIN A BUILDING, THE BALL DRIP SHALL DRAIN TO THE
NEAREST APPROVED CATCH BASIN.
11. A 2" BLOWOFF ASSEMBLY IS REQUIRED WHEN THE DOUBLE DETECTOR CHECK VALVE
ASSEMBLY IS LOCATED FURTHER THAN 18' FROM THE LOOPED WATER LINE SUPPLY.
CITY OF YELM
DEPT. OF PUBLIC WORKS
DOUBLE DETECTOR
CHECK VALVE NOTES
APPROV DWG. NO.
^~~ 6-4.3
PUBLIC WORKS DIRECTOR DATE
DES. DWN. CKD. DATE
ES JEG TP 4/2007