N.J. Admin. Code § 19:6-2.21 - Classifications

(a) For the purpose of this subchapter, soil materials shall be classified and identified in accordance with table 613.6. In addition, the following supplementary definitions shall apply:

1. Rock:

i. Hard sound rock: Includes crystalline rocks such as gneiss, diabase, schist. Characteristics are: the rock rings when struck with pick or bar; does not disintegrate after exposure to air or water; breaks with sharp fresh fracture; cracks are unweathered and less than one-eighth inch wide, generally no closer than three feet apart; core recovery with a double tube, diamond core barrel is generally 85 per cent or greater for each five foot run;

ii. Medium hard rock: Includes crystalline rocks of subparagraph i of this paragraph, plus marble and serpentine. Characteristics are: all those listed in subparagraph i of this paragraph, except that cracks may be 1/4 inch wide and slightly weathered, generally spaced no closer than two feet apart; core recovery with a double tube, diamond core barrel is generally 50 per cent or greater for each five-foot run;

iii. Intermediate rock: Includes rocks of subparagraphs i and ii of this paragraph plus cemented shales and sandstones of Newark formation. Characteristics are: the rock gives dull sound when struck with pick or bar; may not disintegrate after exposure to air or water; broken pieces may show weathered surfaces; may contain fractured and weathered zones up to one inch wide spaced as close as one foot; core recovery with a double tube, diamond core barrel is generally 35 per cent or greater for each five foot run.

iv. Soft rock: Includes rocks of subparagraphs i, ii, and iii of this paragraph in partially weathered condition, plus uncemented shales and sandstones. Characteristics are: rock may soften on exposure to air or water, may contain thoroughly weathered zones up to three inches wide but filled with stiff soil; core recovery with a double tube, diamond core barrel is less than 35 per cent for each five foot run, but standard penetration resistance in soil sampling is more than 50 blows per foot. Where core recoveries are less than 20 per cent and the material is to be used for bearing, a minimum three-inch diameter core shall be recovered and the material recovered shall be classified in accordance with table 613.6.

(b) Special soil types rules are:

1. Fine sand: Soils of Group SM, containing more than 50 per cent (by weight) of particles passing a number 60 mesh sieve;

2. Hardpan: Soils of Groups GM, GC, and SW, generally directly overlying rock and which are sufficiently cemented to be difficult to remove by picking;

3. Clay soils: Soils of each Group SC, CL and CH shall be classified according to consistency as hard, medium or soft in accordance with the following:

i. Hard clay: A clay requiring picking for removal, a fresh sample of which cannot be molded by pressure of the fingers;

ii. Medium clay: A clay that can be removed by spading, a fresh sample of which can be molded by a substantial pressure of the fingers;

iii. Soft clay: A clay, a fresh sample of which can be molded with slight pressure of the fingers.

4. Silt soils: Soils of each group ML and MH shall be classified as dense, medium or loose depending on relative difficulties of removal as described for hard, medium and soft clays in paragraph 3 of this subsection.

5. Varved silt or varved clay: A natural soil deposit consisting of alternating thin layers of silt, clay and sand in which the silt (clay), or silt (plus clay), sand layers predominate.

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Notes

N.J. Admin. Code § 19:6-2.21