While design of the system was underway, RIDEM, RIAC and the airlines worked collaboratively in developing the provisions of the Consent Agreement incorporating the terms of a new RIPDES permit. Based on historical data, the system is designed to collect approximately 60% of the deicing fluid applied, which achieves or exceeds average collection efficiencies consistent with deicing pads across the country. Pending completion of the deicing management system, RIAC will continue to collect storm water impacted with propylene glycol in accordance with interim measures approved in the MOA. From 2006 through 2010, RIAC's average collection efficiency was 35%, achieving 43% collection efficiency in 2010.
The deicer management system is designed using existing infrastructure, with some modifications to route non-deicing runoff away from the collection point. Deicer runoff collected from the terminal and cargo areas will be sent to two enclosed storage tanks with odor control systems located near Industrial Drive. From the storage tanks, deicer runoff will be treated at an on-site biological treatment system. The effluent from the treatment system will be discharged to the Warwick Sewer Authority sanitary sewer line on Airport Road.
RIAC submitted 30% design of the system to RIDEM in accordance with the MOA on December 12, 2011. Additionally, 100% design will be submitted to RIDEM on August 13, 2012, per the agreed upon schedule. Primary field construction activities will be completed on April 30, 2014. After a period for start-up and commissioning, the system will be required to operate in compliance with the permit on March 30, 2015. The estimated cost to construct the system is $25m (twenty-five million dollars).
RIDEM will post the Consent Agreement and draft permit on its webpage for preliminary review at: http://www.dem.ri.gov/programs/benviron/water/permits/ripdes/pdfs/riacprelim.pdf