(1) A person may blend low-hazard industrial waste or compost additives with general use compost or compost produced from yard waste to create a soil-like product if all of the following conditions are met, as applicable:

  (a) The blending occurs at a class 1 or class 2 composting facility.

  (b) The mixture meets the requirements of section 11553(5) or other requirements approved by the department.

  (c) If the blending is with general use compost, the blending occurs within 30 days after the low-hazard industrial waste or compost additives are collected at the class 1 or class 2 composting facility.

  (2) Gypsum drywall may be added to finished compost if the gypsum drywall constitutes less than 50% of the compost by weight and is less than 1/4 inch in diameter.