During both studies, samples were taken by removing 2 liters of material from three equidistant positions across a 3.4-meter trench and at a depth of 1 m.
The three samples were mixed together and transported on ice to the University of Cincinnati for analysis.
A 408.24-kg subsample from the 27.21-metric ton run of the control, nitrogen amended, and unamended composts, was sent to the pilot- scale facility, upon exiting the trench, for monitoring of curing.