New Jersey Administrative Code › Title 7 - ENVIRONMENTAL PROTECTION › Chapter 9A - STANDARDS FOR INDIVIDUAL SUBSURFACE SEWAGE DISPOSAL SYSTEMS › Subchapter 5 - DETERMINATION OF SOIL SUITABILITY › Section 7:9A-5.4 - Criteria for determination of soil suitability classes

Current through Register Vol. 56, No. 14, July 15, 2024
(a) The soil
				suitability class shall determine what type(s) of standard disposal field
				installation(s), if any, may be approved on a given site. The soil suitability
				class is determined based upon the type and depth of limiting zone(s) present.
				In the case of disturbed ground, additional factors must be considered, as
				outlined 7:9A-5.10.
(b) The depth to the limiting zone shall be
				measured from the ground surface to the top of the limiting zone. In the case
				of disturbed ground, depth to the limiting zone shall be measured from the
				existing ground surface or the ground surface, whichever is lowest. Criteria
				for recognition of the existing ground surface are given in
				7:9A-5.10(c).
(c) As shown in Table 5.4 below, the soil
				suitability designation consists of a Roman numeral from I to III which
				designates the severity of the soil limitation, together with a letter symbol
				which designates the type(s) of limitation. When more than one limiting zone is
				present, the following practice shall be followed:
1. The primary classification of the soil is
				based upon whichever limiting zone presents the most severe limitation (highest
				number value). Secondary classifications are given based upon limitations which
				are less severe (lower number values). The primary classification is stated
				first followed by secondary classifications in parentheses. For example, the
				classification for a soil with a seasonally high water table (top of the zone
				of saturation) at a depth of 1.5 feet and a massive rock substratum at seven
				feet would be III Wr (II Sr).
2.
				When two or more limiting zones are present with the same degree of limitation,
				a compound symbol is used, in primary or secondary classifications, consisting
				of a Roman numeral showing the degree of limitation followed by a letter symbol
				for each limiting zone. For example, the classification for a soil with a
				seasonally high water table at 2.5 feet and a fractured rock substratum at
				three feet would be II Wr, Sc.
TABLE 5.4 SOIL SUITABILITY
						  CLASSIFICATION
Type of
Depth<1>,
						  Ft.
Suitability
Limiting Zone
Class
Fractured Rock or
>5
I
Excessively Coarse
0-5
IISc
Substratum
Massive Rock or
>9
I
Hydraulically Restrictive
4-9
IISr
<4
IIISr
Hydraulically Restrictive
>9
I
Horizon,
4-9
IIHr
Permeable Substratum
<4
IIIHr
Excessively Coarse Horizon
>5
I
0-5
IIHc
Zone of Saturation,
>5
I
Regional
2-5
IIWr
<2
IIIWr
Zone of Saturation,
>5
I
Perched
2-5
IIWp
<2
IIIWp
[LESS THAN]1[GREATER THAN] Depth is measured from the
				  existing ground surface to the top of the limiting zone. In the case of
				  disturbed ground, the depth to the limiting zone shall be measured from the
				  existing ground surface, identified as prescribed in
				  7:9A-5.10, or the ground surface,
				  whichever is lowest.