N.J. Admin. Code § 7:9A-11.3 - Construction requirements
(a) Seepage pits
shall be constructed within an excavation affording adequate working space and
shall be constructed of stone, brick, cinder, precast concrete or concrete
block, or similar material laid dry with open joints where permeable strata has
been penetrated, except that if the seepage pit is not of circular construction
or if the surrounding ground is subject to cave-in, all horizontal joints shall
be mortared in such a manner as to prevent structural failure. The following
requirements shall be met:
1. All joints
above the inlet, in all cases, shall be made water-tight.
2. Before placement of backfill, all sidewall
areas shall be scarified.
3. The
bottom of the seepage pit shall be filled with coarse gravel to a depth of one
foot unless the bottom is in a sand or gravel formation.
(b) Seepage pits shall be backfilled
according to the following procedure:
1. The
space between the excavation and the seepage pit wall shall be backfilled with
at least three inches of coarse gravel or filter material meeting the
requirements of
7:9A-10.3(e)2.
2. Where cinder or concrete blocks are laid
with core openings exposed, the space between the excavation and seepage pit
wall shall be backfilled with at least six inches of two and one-half inch
crushed stone or gravel.
3.
Backfill above the inlet shall be as required for disposal fields in
7:9A-10.3(f)2 and
shall be thoroughly compacted by hand or mechanical tamping methods. The use of
heavy machinery for this purpose is prohibited.
(c) Covers shall be constructed of reinforced
concrete, shall be a minimum of three inches in thickness, water-tight, and
shall be designed and constructed so as not to be damaged by any load which is
likely to be placed upon them.
(d)
At least one access opening with a removable water-tight cover and a minimum
dimension of 24 inches shall be provided. Access openings shall meet the
following requirements:
1. Access shall be
adequate to permit pumping out of the pit as well as inspection and maintenance
of the inlet.
2. When the cover of
the seepage pit is deeper than 12 inches below finished grade, the access
opening shall be extended to within 12 inches of finished grade by means of a
concrete riser with a cast-iron manhole cover.
3. When the access opening is below finished
grade, a permanent marker at finished grade shall be provided to indicate its
location.
4. When the access
opening is at or above finished grade, the cover shall be bolted, locked or
otherwise secured to prevent access by children.
Notes
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