Distribution and Meters

Question 1

Lines buried properly?

Answer 1

290.44(a)(4)

Water transmission and distribution lines must be installed in accordance with the manufacturer’s instructions. However, the top of the waterline must be located below the frost line and in no case shall the top of the waterline be less than 24 inches below ground surface.

Question 2

Adequate flush/gate valves?

Answer 2

290.44(d)(6)

The system shall be designed to afford effective circulation of water with a minimum of dead ends. All dead-end mains shall be provided with acceptable flush valves and discharge piping. All dead-end lines less than two inches in diameter will not require flush valves if they end at a customer service. Where dead ends are necessary as a stage in the growth of the system, they shall be located and arranged to ultimately connect the ends to provide circulation.

Question 3

Is the disinfection equip. operated to maintain the minimum required residual (0.2 mg/L free/0.5 mg/L chloramine)?

Answer 3

290.46(d)(2)

The disinfection equipment shall be operated to maintain the following minimum disinfectant residuals in each finished water storage tank and throughout the distribution system at all times

Question 4

Is the system designed to maintain a minimum pressure of 35 PSI at all points under normal usage conditions and
a minimum pressure of 20 PSI under combined fire fighting and drinking water flow conditions?

Answer 4

290.44(d)

Minimum pressure requirement. The system must be designed to maintain a minimum pressure of 35 psi at all points within the distribution network at flow rates of at least 1.5 gallons per minute per connection. When the system is intended to provide firefighting capability, it must also be designed to maintain a minimum pressure of 20 psi under combined fire and drinking water flow conditions. The distribution system of public water systems that are also affected utilities, defined in TWC §13.1394 or §13.1395, must be designed to meet the requirements of §290.45(h) or (i) of this title (relating to Minimum Water System Capacity Requirements).

Question 5

Free Cl or chloramine residual (as total Cl) measured to a min. accuracy of ± 0.1 mg/L?

Color comparators used for distribution system samples only?
Reagents current? Comparator unfaded and clear? Sample cell not discolored or stained?
Is it read within correct range (Diluted if necessary w/ Cl-free water)?

Test kit for free chlorine and total chlorine available?

Test kit for free ammonia and monochloramine available (if required)?

Test kit for nitrite and nitrate available or accredited lab able to provide results w/in 48 hrs (if required)?

Answer 5

290.110(d)(1)

The free chlorine or chloramine residual (measured as total chlorine) must be measured to a minimum accuracy of plus or minus 0.1 mg/L. Color comparators may be used for distribution system samples only. When used, a color comparator must have current reagents, an unfaded and clear color comparator, a sample cell that is not discolored or stained, and must be properly stored in a cool, dark location where it is not subjected to conditions that would result in staining. The color comparator must be used in the correct range. If a sample reads at the top of the range, the sample must be diluted with chlorine-free water, then a reading taken and the resulting residual calculated.