MARINA - ACTIVE UST SITE
Coastal Area, Chatham County, Ga
Contaminants:
BTEX, MTBE
Treatment:
ISCO injection using Klozur CR®
Site Status:
NFA (2011)
Mr. Ken Summerour, P.G. (Envirorisk’s Principal Geologist), along with his former company, designed a treatability study followed by a source area ISCO treatment at an active UST site located at a marina on the Georgia coast. The site is situated in the coastal plain province immediately adjacent to the Ogeechee River with an approximate depth to water of 5-7 feet with tidal influences.
The treatability study evaluated the use of catalyzed hydrogen peroxide (CHP) using a higher pH buffered catalyst/chelator along with alkaline activated sodium persulfate. The results indicated sufficient reduction using both oxidant mixtures; however, in order to meet the stringent treatment goals, Klozur CR® was selected because it offered a “treatment train” approach, combining chemical oxidation and aerobic biostimulation through a follow-up release of oxygen.
The ISCO injection was performed into 21 points using 180 pounds of Klozur CR® per point. Prior to injection, BTEX was detected in excess of 44,000 μg/L, with benzene detected at 3,280 μg/L. Post injection results showed a significant reduction in dissolved benzene/total BTEX, as shown in the graphs below for MW-3 and MW-4, located 10 feet from the river.
The total cost of the project was <$33,000, and a No Further Action was received from the Georgia EPD after only one injection.