Current through Register Vol. 56, No. 18, September 16, 2024
(a) In addition to the well permitting
requirements at N.J.A.C. 7:9D-1 and the general construction specifications at
N.J.A.C.
7:9D-2.2, the following specific requirements
shall apply to all Category 3 and 4 wells:
1.
Copies of the site-specific well construction requirements shall be maintained
at the drilling site by the well driller;
2. All annular space between the casing and
the oversized borehole shall be sealed in accordance with the requirements in
7:9D-2.9 and 2.10;
3. For all monitoring wells, no more than 25
feet total of well screen shall be installed. For all monitoring wells
constructed without a screen, there shall be no more than 25 feet total of open
borehole;
4. No more than five feet
of filter pack shall be placed above the top of the well screen;
5. Protective steel casing shall be installed
to a minimum depth of two feet below grade, equipped with a steel locking cap
and securely set in concrete. This requirement shall only apply to all above
grade well installations and does not apply to wells that require connection to
a manifold system, for example, soil vapor extraction wells, or groundwater
treatment wells;
6. All
flush-mounted wells shall be constructed with manholes, locking caps, and seals
to prevent leakage of surface water into the well. This requirement does not
apply to wells that require connection to a manifold system, for example, soil
vapor extraction wells, or groundwater treatment wells; and
7. Below-grade well installations shall be in
accordance with the Department's Field Sampling Procedures Manual, August 2005,
as amended and supplemented.
(b) Category 3 and 4 wells in consolidated
formations shall be constructed in accordance with the following:
1. Wells drilled to screen across the
overburden bedrock interface shall be constructed using a maximum of 10 feet of
well screen. In all other cases, the borehole drilled to case off the
overburden shall extend a minimum of 10 feet into competent bedrock;
and
2. If a well screen and riser
pipe are to be installed, applicable well specifications for wells shall be
adhered to pursuant to
7:9D-2.2.
(c) Category 3 and 4 wells in unconsolidated
aquifers where a confining layer(s) exist shall be constructed in accordance
with the following:
1. Any screened interval
or filter pack shall not extend across the interface of a confining layer and
an aquifer.
(d) Category
3 and 4 wells in unconsolidated aquifers using direct push technologies are
permitted to be installed to a maximum depth of 30 feet and grouted in
accordance with N.J.A.C.
7:9D-2.9 and
2.10.
(e) Category
3 and 4 geotechnical borings involving the use of direct-push technologies
shall be installed such that the borehole can be decommissioned in accordance
with N.J.A.C. 7:9D-3.
(f) In
addition to the general well drilling and well permitting requirements in
N.J.A.C. 7:9D-1 and 2.2, the following requirements shall
apply to the construction of all cathodic protection wells:
1. The borehole diameter shall be at least
four inches larger than the diameter of the anode, cathode, or casing to be
used;
2. The top of a cathodic
protection well casing shall be fitted with watertight caps, covers, "U" bends,
or equivalent devices or housings to prevent entry of surface water and
pollutants. All such covers shall allow venting of gases from the well;
and
3. The annular space between
the casing and the oversized borehole shall be sealed in accordance with the
requirements in N.J.A.C.
7:9D-2.9 and
2.10.
