R.I. Gen. Laws § 2-22-11
The director of environmental management is authorized pursuant to publication and notice to adopt and enforce rules and regulations relating to sampling, analytical methods, form, minimum percentages, soil amending ingredients, exempted materials, investigational allowances, definitions, records, labels, labeling, liability bond, misbranding, mislabeling, and the distribution of soil amendments as may be necessary to carry into effect the full intent and meaning of this chapter. The director of environmental management is authorized and empowered to adopt and enforce rules and regulations to waive registration and fee requirements for agricultural, municipal and other compost facilities based upon the size of operation, volume and composition of material being composted.
R.I. Gen. Laws § 2-22-11