The second part of a study conducted by Ohio Environmental Protection Agency, the Ohio State University, the Ohio Composting Association and GT Environmental Inc is presented. Research was conducted at eight composting sites in Ohio. The majority are Class IV facilities (under Ohio EPA rules) that may only accept source separated yard trimmings and specified bulking agents. This article describes the test procedures at each site. The results show that the compost volumes reported to Ohio EPA by the composting facilities are generally within 20% of actual amounts when accurate records are maintained on loader buckets of material received and sold. Based on results of this study, the circumference and major/minor axis estimated volumes were relatively similar, with the circumference method giving a 16% higher value. The method of estimating the loader volume, based on the bulk density by the small bucket and weights of the compost products for the loader bucket, showed percentage differences as high as 81%.