Ind. Code § 13-20-25-13

Sec. 13. A recycler is not required to measure directly the weight of recyclable materials for purposes of submitting a recycling activities report under this chapter. For the purposes of reporting the quantity, in tons, of a type of recyclable material recycled, a recycler may estimate the weight of the recyclable material by converting the volume of the recyclable material to weight based on the density of the recyclable material.