For the purposes of this act, unmanufactured horse manure shall be deemed to be adulterated if it contains any water, intentionally or deliberately added, or if any other manure, or any other foreign substance is intentionally mixed therewith, whether such added water, manure, or other substance is added thereto, or becomes a part thereof, by permitting water or any other substance to flow or seep into, or otherwise become a part of such unmanufactured horse manure while standing in a manure pit or any other place.
N.J.S. § 4:9-30