[HISTORY: Adopted by the Board of Health
of the Township of Hillsborough 4-2-1990 (Ch. 183 of the 1977 Code). Amendments
noted where applicable.]
This chapter shall be known and cited by its
title: "Hillsborough Township Board of Health Standards for Individual
Subsurface Sewage Disposal Systems Ordinance."
A.
The code hereby established by this chapter shall
be known and cited as "Chapter 9A, Disposal Systems," N.J.A.C. 7:9A-1
et seq.
B.
The code established by this chapter concerning the
standards for individual subsurface sewage disposal systems, commonly
known as "N.J.A.C. 7:9A-1 et seq. (January 1990)," which was adopted
by the New Jersey Department of Environmental Protection pursuant
to N.J.S.A. 58:11-25 et seq., shall be known and cited as such, and
the same is hereby established, adopted and made an ordinance of this
Board pursuant to N.J.S.A. 26:3-66 et seq., and the statutes in such
case made and provided, and a copy of this Code is annexed hereto
and made a part hereof without the inclusion of the text thereof herein;
three certified true copies of said code marked as aforesaid were,
on the introduction of this chapter, placed on file in the office
of the Clerk of this Board, where the same will remain on file for
the use and examination of the public until final action is taken
on this chapter, and, if this chapter is adopted, will also remain
on file in said office for such use and examination for so long as
this chapter shall remain in full force and effect, and three additional
certified true copies of said code, marked as aforesaid, and three
certified true copies of this chapter shall be placed on file and
shall remain on file in the office of any board, body or office of
the Township of Hillsborough, in the County of Somerset, having in
charge the enforcement of this chapter and said code for the use and
examination of the public for so long as this chapter shall remain
in full force and effect. This chapter and said code may be printed
in composite form for general use.
The code in question is hereby amended and supplemented
as follows:
A.
By deleting Section 7:9A-3.6 and replacing the same
with the following:
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7:9A-3.6 The administrative authority or its
authorized expert (soil scientist) witnessing agent shall witness
the excavation of soil profile pits and borings, in-situ permeability
testing or soil sample collection and any other site evaluations relied
upon in the design or location of the system following the filing
of an application and payment of a permit/witness fee of $500 per
day (available in half-day segments of $250). Tests will be scheduled
within 45 days of acceptance of a completed application.
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B.
By deleting Section 7:9A-3.16 and replacing the same
with the following:
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7:9A-3.16 Prior tests. Percolation test results,
soil logs and determination of seasonally high water table made prior
to January 1, 1990, may be used as a basis for design and location
of an individual subsurface sewage disposal system for two years following
January 1, 1990, following the submission to and approval by the administrative
authority of a detailed and comprehensive by-lot analysis certified
by a professional engineer of previously obtained validated site test
data's applicability to compliance with system design requirements
set forth in this chapter.
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C.
By deleting Section 7:9A-7.4 and replacing the same
with the following:
[Added 9-14-1992]
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7:9A-7.4 Volume of sanitary sewage.
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(a)
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Each component of the individual subsurface sewage disposal system shall be designed and constructed to adequately treat and dispose of the expected volume of sanitary sewage to be discharged from the premises to be served. The expected volume of sanitary sewage from private residential sources shall be determined based on the criteria set forth in Subsection (b) below. In addition, the volume of sanitary sewage shall be reduced as much as possible so as not to deplete the groundwater supply also as set forth under the criteria in Subsection (b) below. The expected volume of sanitary sewage from commercial or institutional establishments shall be determined based on the criteria set forth in Subsection (c) below.
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(b)
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The criteria for estimating and reducing the
volume of sanitary sewage from private residential sources shall be
as follows:
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1.
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The daily volume for each bedroom or dwelling
unit shall be:
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Volume for first bedroom: 200 gallons per day.
Volume for each additional bedroom: 150 gallons
per day.
Minimum volume per dwelling unit: 350 gallons
per day.
Minimum volume per apartment: 350 gallons per
day.
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2.
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The minimum volume for a dwelling unit shall
be reduced to 200 gallons per day in the case of deed-restricted senior
citizen communities or mobile home parks with dwelling units less
than 500 square feet in size.
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3.
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The most recent state-of-the-art low-flow plumbing
fixtures shall be used throughout the residential structure.
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D.
Section 7:9A-10.1(f)4 and 5 is replaced with the following:
[Added 9-14-1992]
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4.
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When fill material is utilized within the zone
of treatment, the fill material shall meet the following requirements:
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i.
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Coarse fragment content less than 15% by volume
or less than 25% by weight;
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ii.
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Textural analysis (composition, by weight, of
size fraction passing the two-millimeter sieve): from 85% to 95% fine
to coarse sand, from 5% to 15% silt plus clay, minimum 2% clay, and
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iii.
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Permeability from two to 20 inches per hour;
or percolation rate from three to 30 minutes per inch.
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5.
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When the fill material is placed within the
zone of disposal, the fill material shall meet the following requirements:
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i.
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Textural analysis (composition, by weight, of
size fraction passing the two-millimeter sieve): 85% or more fine
to coarse sand; and
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ii.
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Permeability greater than two inches per hour;
or percolation rate faster than 30 minutes per inch.
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E.
Section 7:9A-10.4(f) is replaced by the following:
[Added 9-14-1992]
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(f)
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Fill material used in soil replacement disposal
field installations shall meet the following requirements:
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1.
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The fill material used below the disposal field
shall meet the requirements for texture and permeability which are
prescribed in 7:9A-10.1(f) and;
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i.
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All fill material used must be stockpiled on
the subject property and representative sample tested prior to installation;
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ii.
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The representative sample of fill material shall
be subject to a modified soil permeability class rating as prescribed
in 7:9A-6.3 and disturbed tube permeameter tests as prescribed in
7:9A-6.2(e) prior to installation.
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iii.
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A minimum of three percolation tests shall be
conducted at the level of infiltration after the fill material has
been installed.
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iv.
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Compaction may be accomplished manually or mechanically,
by tamping or by driving over the filled area in a controlled pattern
using tracked vehicles. Compaction may also be accomplished by puddling.
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F.
Section 7:9A-6.3 is supplemented by adding the following:
[Added 9-14-1992]
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(i)
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When the material being tested is fill material being used below the disposal field in association with a soil replacement installation, Subsection (g) 4 and 5 shall be modified as follows:
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1.
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Step four: assemble a stack of sieves consisting
of a pan, a sieve of 0.053 millimeter, a sieve of 0.106 millimeter
and a sieve of 0.25 millimeter, from bottom to top, respectively;
inspect sieves carefully before using to make sure that they are clean
and undamaged; transfer the sand from the evaporating dish to the
top sieve using a soft brush to complete the transfer.
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2.
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Step five: put the cover on the top sieve, firmly
fasten the sieves to the sieve shaker and shake for five minutes;
disassemble the stack of sieves, transfer the contents of each sieve
to a weighing dish separately; weigh the contents of each sieve to
the nearest 0.01 gram; record the following data:
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i.
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Total weight of sand fraction from step three;
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ii.
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Weight of sand passing the sieve of 0.25 millimeter
separately (retained in the sieve of 0.106 millimeter and the sieve
of 0.053 millimeter);
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iii.
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Percent fine sand: Divide weight of sand retained
in the sieve of 0.106 millimeter by the total weight of sand fraction
and multiply this value by 100;
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iv.
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Percent very fine sand: Divide weight of sand
retained in the sieve of 0.053 millimeter by the total weight of sand
fraction and multiply this value by 100.
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3.
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The following procedure shall be used to determine
the fine-to-coarse sand fraction:
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i.
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Percent sand [obtained from 7:9A-6.3(f)6 minus
{percent sand multiplied by percent very fine sand [obtained from
7:9A-6.3(i)2.iv]}: [% sand - (% sand x % vf sand)]
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Example:
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95% sand fraction
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[from 7:9A-6.3(f)6]
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5% very fine sand
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[from 7:9A-6.3(i)2]
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95% - (95% x 5%) = 90.25%
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(fine-to-coarse sand)
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G.
Section 7:9A-7.2 (c), (d), (e) Construction is supplemented
by adding:
[Added 1-8-1996]
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(c)
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All disposal field construction must be completed
and backfilled within seven days of the initiation of the excavation
of the disposal field area.
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(d)
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All new septic system construction permitted
within Hillsborough Township's Mountain Zone (MZ) must be completed
and approved by the administrative authority before a building permit
is issued.
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(e)
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Replacement disposal systems at existing properties
must adhere to Township Development Regulations for grading standards
and stabilization requirements.
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