Township of Hillsborough, NJ
Somerset County
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Table of Contents
Table of Contents
[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.]
GENERAL REFERENCES
Sewer use — See Ch. 245.
Sewers — See Ch. 337.
Sump pump disconnection — See Ch. 341.
Water supply — See Ch. 350.

§ 333-1 Title.

This chapter shall be known and cited by its title: "Hillsborough Township Board of Health Standards for Individual Subsurface Sewage Disposal Systems Ordinance."

§ 333-2 Establishment of standard code; copies on file.

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.

§ 333-3 Amendments to code.

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:
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.
B. 
By deleting Section 7:9A-3.16 and replacing the same with the following:
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.
C. 
By deleting Section 7:9A-7.4 and replacing the same with the following:
[Added 9-14-1992]
7:9A-7.4 Volume of sanitary sewage.
(a)
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.
(b)
The criteria for estimating and reducing the volume of sanitary sewage from private residential sources shall be as follows:
1.
The daily volume for each bedroom or dwelling unit shall be:
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.
2.
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.
3.
The most recent state-of-the-art low-flow plumbing fixtures shall be used throughout the residential structure.
D. 
Section 7:9A-10.1(f)4 and 5 is replaced with the following:
[Added 9-14-1992]
4.
When fill material is utilized within the zone of treatment, the fill material shall meet the following requirements:
i.
Coarse fragment content less than 15% by volume or less than 25% by weight;
ii.
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
iii.
Permeability from two to 20 inches per hour; or percolation rate from three to 30 minutes per inch.
5.
When the fill material is placed within the zone of disposal, the fill material shall meet the following requirements:
i.
Textural analysis (composition, by weight, of size fraction passing the two-millimeter sieve): 85% or more fine to coarse sand; and
ii.
Permeability greater than two inches per hour; or percolation rate faster than 30 minutes per inch.
E. 
Section 7:9A-10.4(f) is replaced by the following:
[Added 9-14-1992]
(f)
Fill material used in soil replacement disposal field installations shall meet the following requirements:
1.
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;
i.
All fill material used must be stockpiled on the subject property and representative sample tested prior to installation;
ii.
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.
iii.
A minimum of three percolation tests shall be conducted at the level of infiltration after the fill material has been installed.
iv.
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.
F. 
Section 7:9A-6.3 is supplemented by adding the following:
[Added 9-14-1992]
(i)
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:
1.
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.
2.
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:
i.
Total weight of sand fraction from step three;
ii.
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);
iii.
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;
iv.
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.
3.
The following procedure shall be used to determine the fine-to-coarse sand fraction:
i.
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)]
Example:
95% sand fraction
[from 7:9A-6.3(f)6]
5% very fine sand
[from 7:9A-6.3(i)2]
95% - (95% x 5%) = 90.25%
(fine-to-coarse sand)
G. 
Section 7:9A-7.2 (c), (d), (e) Construction is supplemented by adding:
[Added 1-8-1996]
(c)
All disposal field construction must be completed and backfilled within seven days of the initiation of the excavation of the disposal field area.
(d)
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.
(e)
Replacement disposal systems at existing properties must adhere to Township Development Regulations for grading standards and stabilization requirements.