N.J. Admin. Code § 7:9A-5.4 - Criteria for determination of soil suitability classes
(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.
Notes
See: 43 N.J.R. 478(a), 44 N.J.R. 1047(a).
In (b), deleted "existing" preceding the first and third occurrences of "ground surface", and substituted "existing" for "pre-existing natural" preceding the second and fourth occurrences of "ground surface"; and in the footnote following Table 5.4 of (c)2, deleted "natural" preceding "ground" in the first sentence and "existing" following "or the", and substituted "existing" for "pre-existing natural" preceding the second occurrence of "ground surface".
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