North Carolina Well Authorization Exam: Water Supplies Regulations and Procedures (.1720)

A water supply serving an establishment regulated under this Subchapter shall be disinfected upon completion of construction, maintenance, repairs, pump installation, or a report of a positive coliform sample as follows:

(1) chlorine in sufficient quantities to produce a chlorine residual of at least 100 milligrams per liter (mg/l) shall be placed in the supply;

(2) a chlorine solution shall be placed in the supply in such a manner as to contact any water-contact parts and materials above the normal water level;

(3) a chlorine solution shall stand in the supply for a period of at least 24 hours; and,

(4) the supply shall flow to waste until no disinfectant can be measured with a test kit that measures chlorine levels

A spring enclosure shall be disinfected upon completion of construction, maintenance, repairs, pump installation, or a report of a positive coliform sample as follows:

(1) the interior walls of the spring enclosure shall be washed or swabbed with a chlorine solution of at least 100 milligrams per liter (mg/1) or greater of chlorine residual approved by the Department;

(2) the disinfectant shall be poured into the spring, the service pipe shall be plugged, and water shall be retained in the spring storage for at least 24 hours, or, disinfectant shall be fed into the spring continuously for at least 24 hours; and

(3) the spring shall flow to waste until no disinfectant can be measured with a test kit that measures chlorine levels.

Certified Laboratory

the North Carolina State Laboratory of Public Health certified by the US Environmental Protection Agency or a laboratory certified by the Certification Section of the North Carolina Public Health Laboratory pursuant to 10A NCAC 42D to perform tests to determine the presence of coliform bacteria or the chemical constituents to be tested.

Coliform Bacteria or Total Coliform

aerobic or facultative anaerobic, gram-negative, non-spore forming, rod shaped bacteria included in the genera Klebsiella, Enterobacter, Escherichia and Citrobacteria. Coliform bacteria originate in soil, vegetation or the intestinal tract of warm-blooded animals. The presence of coliform bacteria in a water sample indicate the presence of a pathway for bacteria and possibly pathogens to gain entry into a water supply system

Department of Environment and Natural Resources or Department

the North Carolina Department of Environment and Natural Resources. The term also means the authorized representative of the Department.

Fecal Coliform Bacteria or Fecal Coliform

a sub-group of coliform bacteria that are present in the intestinal tract and feces of warm-blooded animals. The presence of fecal coliform bacteria in a water sample indicate fecal contamination and the presumed presence of pathogens in the water supply

Local Health Department

the county or district health department or its successor.

Private Drinking Water Well

any excavation that is cored, bored, drilled, jetted, dug, or otherwise constructed to obtain groundwater for human consumption and that serves or is proposed to serve 14 or fewer service connections or that serves or is proposed to serve 24 or fewer individuals. The term "private drinking water well" includes a well that supplies drinking water to a transient noncommunity water system

How many days after the LHD issues a certificate of completion for a newly constructed private drinking water well, the local health department shall obtain water samples and submit them to a certified laboratory for analyses or ensure that the water obtained from the well has been sampled and tested by a certified laboratory

30

Samples collected from private drinking water wells pursuant to the rules of this Section shall be collected by

employee of a local health department, or a certified laboratory.

The sample collector shall be use aseptic sampling techniques for

collection of coliform bacteria and sampling techniques and containers for chemical constituents following methods described in 40 Code of Federal Regulations 141.23 Inorganic Chemical Sampling and Analytical Requirements and 40 Code of Federal Regulations 143.4 Monitoring, which are incorporated by reference including any subsequent amendments, additions or editions.

T or F

Sample collectors shall be trained in accordance with guidance developed by the Department.

T

Water samples shall be collected from

the sample tap at the well or the closest accessible collection point to the water source with a tap capable of being disinfected, provided the sampling point shall precede any water treatment devices.

T or F

If is NOT the responsibility of the well owner to provide access and a source of power for the purpose of collecting the required water sample?

F- it is their responsibility

For New private drinking water wells samples for total coliform and fecal coliform shall be?

collected after the disinfectant agent has been flushed from the well and water supply system.

T or F

Required water samples shall not be collected: from wells that are not constructed and located in accordance with the rules of 15A NCAC 02C .0100 and .0300.

T

Additional or retest samples may be collected if:

(1) during the permitting, construction and sampling process, information indicates the potential for other contaminants to be present in the groundwater source; or

(2) if necessary to confirm initial testing results.

A water sample shall be tested for

total coliform bacteria and if present, further analyzed for the presence of fecal coliform bacteria or E. coli.

A water sample shall be analyzed for

Arsenic, Barium, Cadmium, Chromium, Copper, Fluoride, Lead, Iron, Magnesium, Manganese, Mercury, Nitrate, Nitrite, Selenium, Silver, Sodium, Zinc and pH

Laboratories shall report results of chemical and bacteriological water sample analyses for each new private drinking water well to:

(1) the local health department;

(2) the DENR Private Water Supply Protection Branch; and

(3) the DHHS Division of Public Health, Epidemiology Section, Occupational and Environmental Epidemiology Branch.

For all private well sampling data where chemical or biological contaminants are detected exceeding the Maximum Contaminant Levels (MCLs) for public drinking water, shall provide the following to the local health department from which the sample was collected:

(1) information about the contaminant(s); exceeding public drinking water MCLs;

(2) recommendations for; water use limitations or treatment options to reduce exposure to a level comparable to meeting public drinking water MCLs; and

(3) recommendations about the need for and the frequency of repeat sampling.

T or F

The local health department shall provide information to the well owner or respective lease holder concerning chemical and biological contaminants exceeding public drinking water MCLs and the need for exposure limitation, remediation, and/or future sampling

T