Hope this helps:
9,000,000 gallons per week * .03 per gallon (from prospectus) = $270,000 per week.
$270,000 * 52 weeks = $14,040,000 annual revenue
$14,040,000 * .2 (Ecosphere's 20% portion) = $2,808,000 annual revenue
$2,808,000/12 (months) = $234,000 per month