N.J. Admin. Code § 5:23-10.2
The following words, terms, and abbreviations, when used in this subchapter, shall have the following meanings unless the context clearly indicates otherwise.
"Foundation pipe drain" means a drain placed around the perimeter of a foundation that utilizes a perforated pipe. An "interior foundation pipe drain" is one placed around the internal perimeter of a foundation. An "exterior foundation pipe drain" is one placed around the external perimeter of a foundation.
"French drain" or "channel drain" means a path used to assist with water drainage which is installed in basements of some structures during initial construction, which consists of a gap (typically one-half to one and one-half inch in width) between the basement block wall and the concrete floor slab around the entire inside perimeter of the basement.
"Perforated pipe" means rigid plastic pipe that is a minimum wall thickness of Sewer and Drain ASTM-D2729, with at least a two-and-a-half-inch diameter hole every five *inches* of piping set approximately 120 degrees apart.
"Picocurie per Liter (pCi/L)" means 2.2 disintegrations per minute of radioactive material per liter. It may be used as a measure of the concentration of radon gas in air. One picocurie is equivalent to 10-12 Curies.
"Radon collection mat" means an under slab prefabricated material specifically made to create a lateral void space under a slab to allow water or air to pass through it.
"Radon" means the radioactive noble gas radon-222.
"Radon progeny" means the short-lived radionuclides formed as a result of the decay of radon-222, including polonium-218, lead-214, bismuth-214 and polonium-214.
"Soil gas vent pipe" means a gas- and water-tight pipe not less than three to four inches in diameter that is routed from perforated pipe or radon collection mats (or equivalent approved method) to an approved location outside the building.
"Sump" means a pit or hole in or through a basement floor slab designed to collect water, and from which such water is drained by means of a vertical-lift or sump pump.
"Sump pump" means a pump used to move collected water out of the sump to an above grade discharge remote from the structure.
"Working level (WL)" means that concentration of short-lived radon decay products that will result in 130,000 million electron volts of potential alpha-particle energy per liter of air. Working level is a measure of radon decay product concentration in air.
N.J. Admin. Code § 5:23-10.2