7:9A-1.6. General prohibitions.
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(a)
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No person shall locate, construct, alter or repair any individual subsurface
sewage disposal system until a permit for the location, construction, alteration
or repair of said sewage disposal system has been issued by the administrative
authority as defined in N.J.A.C. 7:9A-2.1.
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(b)
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The administrative authority shall not issue an approval, permit, certification
or license for the installation, construction, alteration or operation of
an individual sewage disposal system where such installation, construction,
alteration or operation will violate or otherwise not be in compliance with
the requirements of N.J.A.C. 7:9A-1.1 et seq., this chapter and all other
applicable laws, regulations and ordinances.
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7:9A-5.2(b) Requirements for Profile Pits.
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A minimum of two profile pits is required for each disposal field. Soil
borings in lieu of profile pits are not acceptable.
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7:9A-5.2(b) Seepage Pits.
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When a seepage pit(s) is proposed, as allowed in N.J.A.C. 7:9A-5.2(d),
a minimum of one profile pit shall be performed for each seepage pit. Profile
pits shall be located no further than 15 feet from the proposed seepage pit.
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7:9A-5.8(b)(2) Criteria or recognition of zones of saturation.
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Except for tests in connection with the alteration or repair of existing
systems, where any of the groundwater conditions identified in Section 5.8(b)(2)(v)
of this chapter are present, initial groundwater elevations shall be determined
only during the months of January through April (unless the period for initial
testing is lengthened or shortened by NJDEP or by the administrative authority
due to a significant departure from normal climatic conditions). All such
tests, whenever conducted, shall be based upon the following:
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i.
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Water levels shall be measured directly within soil profile pits. Observation
pits shall be dug in natural soil immediately outside of or within 15 feet
radius of the proposed leaching system as required by N.J.A.C. 7:9A. The observation
pits shall be a minimum of 10 feet in depth or to bedrock, but in no case
shall the observation pit extend less than four feet below the bottom of the
proposed leaching system.
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ii.
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The observation pit shall be of such size as to permit ready observation
of earth material characteristics, depth to seasonal high water table and
depth to bedrock.
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iii.
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Tests in the disposal area shall be conducted to provide evidence of
the elevations of any perched zone of saturation and the regional zone of
saturation. These tests shall be conducted in a manner to allow for groundwater
equilibrium to be reached over a period of not less than 24 hours from the
start of the test, through a method to be proposed by the applicant's engineer
and agreeable to the administrative authority or its authorized agent. The
usual method acceptable to the administrative authority is by monitoring standpipes
or piezometers installed vertically within the soil profile pits and the pits
backfilled.
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iv.
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Initial groundwater observations shall be made after equilibrium is
described above.
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v.
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Additional daily monitoring of the water table over a period of not
less than three business days from the start of the test will be required,
when any of the following conditions exist:
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(A)
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The groundwater table is observed within five feet of the surface of
the ground;
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(B)
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Where there is mottling observed within five feet of the surface of
the ground, unless caused by a perched zone of saturation;
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(C)
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Where the Hunterdon County Soil Conservation Service, County Soil Survey
Report shows groundwater to be within five feet of the surface of the ground,
and the on-site soil profile description matches the description of the soil
series in question within the County Soil Survey Report, or the soil is rated
as having "severe" constraints for septic disposal (the seasonally high groundwater
levels for the site as determined by the Soil Conservation Service in its
Soil Survey Report, together with a comparison of the soil series present
at the site with the soil series description contained in the County Soil
Survey Report, shall be provided by the applicant to the administrative authority);
or
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(D)
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Where there are topographical features, hydric soils, or hydrophitic
vegetation that would indicate the likelihood of a high seasonal groundwater.
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vi.
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The administrative authority may require additional information and
testing concerning the groundwater table based upon the severity of the groundwater
levels encountered and prevailing climatic conditions.
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vii.
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All groundwater test and monitoring results shall be certified by a
licensed professional engineer and witnessed by a representative of the administrative
authority. Reports of the depth to the referenced groundwater shall be made
on forms furnished by the administrative authority.
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viii.
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All test piezometers and standpipes shall be removed within 10 days
after completion of the tests, except where authorized by the NJDEP for water
quality testing. Extensions of time may be granted upon written application
to the administrative authority.
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7:9A-6.1(a) General provisions for permeability testing.
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(1)
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The design permeability is the basis for determining the minimum required
area of the disposal field. Tests shall be required at the site of each disposal
field, at the level of infiltration, for determination of the design permeability.
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(2)
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Where what would otherwise be a conventional disposal field meeting
the requirements of Section 10.1(c), below, will be installed, tests shall
be conducted at a depth of one to three feet below the ground surface, within
the soil horizon in which the bottom of the disposal field will be placed.
When a soil replacement, mound, or mounded soil replacement installation is
proposed, a minimum of two percolation or tube permeameter tests or more,
meeting the number and placement requirements shown in Appendix C of N.J.A.C.
7:9A, shall be conducted at the level of infiltration after the fill material
has been installed and compacted.
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(3)
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Fill material to be used in the zone of treatment shall meet the coarse
fragment content, textural analysis and permeability requirements of N.J.A.C.
10.1(f)(4), as amended herein. Fill material to be used in the zone of disposal
shall meet the textural analysis and permeability requirements of N.J.A.C.
10.1(f)(5), as amended herein.
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(4)
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Fill material must be delivered and stockpiled at the site for testing
by a qualified soils laboratory and certified by a licensed professional engineer
of New Jersey, indicating the coarse fragment content (where applicable),
the textural analysis and permeability rate of the material. Fill materials
not meeting the requirements set forth in subsection 6.1(a)(3) above will
have to be replaced.
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7:9A-6.1(c) Tube Permeameter and Soil Permeability Class Rating.
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The Tube Permeameter and the Soil Permeability Class Rating tests shall
not be used in soils which are predominantly clay, silty clay, silty clay
loam, sandy clay, sandy clay loam, clay loam, silt loam or silt, unless the
results of the test are confirmed by a permeability test conducted in-situ
as permitted by the Code. For further clarification on these restricted soil
types, reference is made to Appendix A - Figure 6 of N.J.A.C. 7:9A.
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7:9A-10.1(f)(4)(ii) Select fill to be used in the Zone of treatment
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Textural analysis (composition by weight, of size fraction passing the
two-millimeter sieve): from 85% to 95% sand (maximum 25% fine plus very fine
sand), from 5% to 15% silt plus clay, minimum 2% clay.
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7:9A-10.1(f)(5)(ii) Select fill to be used in the
Zone of Disposal
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Textural analysis (composition by weight, of size fraction passing the
two-millimeter sieve): 85% or more sand (maximum 25% fine plus very fine sand).
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