[HISTORY: Adopted by the Board of Health
of the Township of Mansfield 2-24-1999 by Ord. No. 99-04. Amendments noted where
applicable.]
This chapter shall be known as "Public Noncommunity
and Nonpublic Water Systems" and shall provide standards for the construction
of new public noncommunity and nonpublic water systems.
As used in this chapter, the terms shall have
the meanings defined by N.J.A.C. 7:10-1.3 and N.J.A.C. 7:10-12.3.
Those definitions include the following:
A water system that is not a public water system.. A nonpublic
water system includes any water system providing potable water to
individual dwellings and any water system regularly serving fewer
than 15 service connections or 25 individuals.
A public water system which serves at least 15 service connections
used by year-round residents or regularly serves at least 25 year-round
residents.
A public water system that is not a public community water
system and is either a "public nontransient, noncommunity water system"
or a "public transient, noncommunity water system" as defined in this
section.
A public water system that is not a public community water
system and that regularly serves at least 25 of the same persons for
more than six months in any given calendar year.
A public water system that is not a public community or a
public nontransient, noncommunity water system that serves at least
25 transient individuals for at least 60 days in any given calendar
year.
A system for the provision to the public of piped water for
human consumption, if such system has at least 15 service connections
or regularly serves at least 25 individuals daily for at least 60
days in any given calendar year. Such term includes any collection,
treatment, storage and distribution facilities under control of the
operator of such system and used primarily in connection with such
system, and any collection or pretreatment storage facilities not
under such control which are used primarily in connection with such
system. A public water system is either a "public community water
system" or a "public noncommunity water system" as defined in this
section.
A system for providing potable water to any person.
Except as hereinafter modified, the standards
for construction of public noncommunity and nonpublic water systems
set forth in N.J.A.C. 7:10-12.9 et seq. established pursuant to N.J.S.A.
58:11-23 et seq. are hereby adopted in their entirety and incorporated
herein by reference.
A.Â
No building permit shall be issued for the construction
of any new residence on any lot until the Mansfield Township Board
of Health, acting through its agent the Warren County Health Department,
has certified that either:
B.Â
No certificate of occupancy shall be issued for any new residence until the Mansfield Township Board of Health, acting through its agent the Warren County Health Department, has certified that the water supplied by the water system serving the residence has been tested and meets the requirements of § 413-7.
C.Â
The Warren County Health Department, acting as the
authorized agent of the Mansfield Township Board of Health, may require
that the testing procedures required by N.J.A.C. 7:10-12.1 et seq.
or by this chapter be witnessed by an agent or employee of the Health
Department.
Notwithstanding the water volume requirements
of N.J.A.C. 7:10-12.6, the total yield of any nonpublic water system
supplying a residence shall be no less than 2.0 gallons per minute
at the tap per residence served.
In addition to the water volume requirements of § 413-4 of this chapter, any nonpublic water system shall have a minimum recovery rate at the end of 30 minutes of at least 0.5 gallons per minute as determined by the following described testing methods and procedures:
A.Â
Introduction and description of testing method.
(1)Â
The following is a test for evaluating the adequacy
of supply wells to meet typical household water demands. The test
method consists of pumping a recently completed well and allowing
it to recover. The test is designed to be performed over a period
of approximately six hours. The test shall be conducted only after
the recently drilled well has been allowed to recover from the drilling
process for not less than three days. This will allow the well to
recover to the static water level in the aquifer from the depressed
level caused by dewatering during drilling. The yield of the well
is measured during the pumping period and water levels are measured
at regular intervals during the recovery period after the well pump
is turned off. Water-level recovery rates during the recovery period
allow an estimate of groundwater inflow to the well. This rate can
be referred to as the well-recovery rate. Wells are judged to be adequate
if they recover at a rate of at least 0.5 gallon per minute during
the first half hour of recovery. The water level in the well is also
measured 24 and 48 hours after completion of the test to record information
on the long-term water-level recovery.
(2)Â
A worksheet is provided to record the test and carry
out calculations to evaluate the well. A computer program is also
available to record results and allow a more rigorous analysis of
the test.
B.Â
Procedures for testing well.
(1)Â
Measure the static water level in the well. The static
water level is the depth to water in the well at rest. The static
water level shall be measured in feet below the top of the well casing
before pumping the well. The static water level shall not be measured
less than three days after the completion of well drilling. The static
water level shall be recorded on the appropriate place on the test
worksheet.
(2)Â
Begin pumping of well.
(a)Â
Attempt to pump the well at the rate of at least
five gallons per minute for two hours, or until well ceases pumping,
whichever occurs first. The well discharge rate can be measured using
a flow meter or, more simply, a five-gallon bucket and stop watch.
Record the well discharge in the first five minutes of the pumping
period, then 25, 30, 60, 90 and 120 minutes into the pumping period.
Measure the depth to the water in the well at the time the well discharge
measurements are taken. Measure the depth to water in the well immediately
before turning off the pump. This is the final well pumping level.
Record the well discharge rates and accompanying water levels on the
worksheet.
(b)Â
If the well pumpage cannot be sustained for
120 minutes, begin the recovery test whenever the well stops pumping
water. Measure the discharge and water levels at the intervals indicated
above until the well stops pumping.
(3)Â
Begin well-recovery test:
(a)Â
Turn the well pump off and begin the well recovery
test. Measure the water level in the well during the recovery period
at the times shown in Table 1, Well Recovery Test, on the worksheet.
These measurements are well-recovery levels. Recovery readings shall
be collected 24 and 48 hours after the testing is complete.
(b)Â
Calculate well-recovery percentage at each well-recovery
measurement. Well-recovery percentage is the ratio of drawdown remaining
in the well to the total drawdown caused by pumping. Record the well-recovery
percentage at each well-recovery time step in Table 1.
|
Final well pumping level (feet) – recovery
level (feet)
| ||
|---|---|---|
|
Well recovery percentage
|
=
|
|
|
Well pumping level (feet) – static water
level (feet)
|
(c)Â
The well shall be allowed to recover for at
least four hours or until 90% of the drawdown experienced during the
pumping test is recovered, whichever comes first. If the water level
in the well returns to 90% of its original static water level before
four hours has passed, record this time as well-recovery time in Table
1. If 90% of the drawdown is not recovered within four hours, the
recovery time is four hours. Document percentage recovery at 24 and
48 hours in Table 1.
(4)Â
Calculate the well-recovery rate:
(a)Â
The recovery rate of the well is the volume
of inflow to the well bore during a specified time, usually one minute.
An inflow rate shall be calculated for each of the time steps listed
in Step 3 above. Table 1 provides instructions for the calculation
of the well-recovery rates. The well-recovery rate is calculated by
the following method:
|
Water level at time 1 (feet) –
water level at time 2 (feet) x 1.5 gallons per foot
| ||
|---|---|---|
|
Well inflow rate (gpm)
|
=
|
|
|
Recovery time 1 – recovery time
2 (minutes)
|
(b)Â
The well will recover fastest at the beginning.
The well-recovery rate is the inflow calculated over the first 30
minutes. It is equal to the volume of water entering the well in gallons
divided by 30 minutes, and is expressed in gallons per minute.
(5)Â
Determine if recovery rate is satisfactory. To be
judged acceptable for domestic use, the well-recovery rate at the
end of 30 minutes shall be at least 0.5 gallon per minute per residence
served. If the well fails to achieve a recovery rate of 0.5 gpm, the
test shall be repeated to insure that all steps were undertaken correctly.
If it fails a second time, the well shall be deepened or re-drilled
at a different location. Deepening the well may result in encountering
additional water-bearing fractures. Generally, if the well depth exceeds
600 feet, the chances of encountering additional water-bearing fractures
are minimal. If a replacement well is drilled and fails to pass this
test, it may be possible to use both wells in combination to meet
the expected demand if the well-recovery rate of both wells together
exceeds 0.5 gpm.
B.Â
If it is necessary to install a water treatment device
on any portable water supply system in order to meet the above stated
standards, it shall be the obligation of the owner or the builder
of the system to install an appropriate water treatment device as
approved by the Warren County Health Department. Once such a device
is installed, it must remain on the site and be utilized in conjunction
with the water supply system.
The drilling contractor or the owner of the
property shall seal any borehole or well that is abandoned during
construction or is not completed or constructed in accordance with
rules and regulations in effect at the time of construction, in accordance
with N.J.S.A. 58:4A-4.1 and N.J.A.C. 7:9-9.1, et seq. Failure to seal
an abandoned well may subject the owner to the penalty provided for
in N.J.S.A. 58:4a-4.2.
Three copies of N.J.A.C. 7:10-12.1 et seq. have
been placed on file in the office of the clerk of this local Board
of Health and will remain on file there for the use and examination
of the public.
For the application and review of plans, the
sampling of and the inspection of all newly constructed public noncommunity
and nonpublic water systems, and the witnessing of testing, the fee
shall be as established by the Warren County Health Department acting
as the authorized agent of the Mansfield Township Board of Health.
