N.J. Admin. Code § 7:9A-5.4
Current through Register Vol. 56, No. 21, November 4, 2024
Section 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.
N.J. Admin. Code § 7:9A-5.4
Amended by R.2012 d.066, effective 4/2/2012.
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".