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ORC TECHNICAL BULLETIN # V1.1 Oxygen Release Compound,ORCI Disposal Issues Upon the completion of a ORC filter sock application, usually about six months, the disposal of the product becomes an issue. The status of the product is that it will form a weakly cemented magnesium hydroxide and sand matrix by the time it is removed from the wells in which it is placed. This is essentially a solid block of Milk of Magnesia and sand in a 50:50 ratio. It may have absorbed minor amounts of the target hydrocarbons during exposure, however, it is clear that if the spent material was exposed to the air it would soon dissipate or be further remedfated since it would retain moisture for a period Spent product set on a tarp and exposed to air would probably allow ND to be reached in a short period on the assumption compounds were present. The larger problem is the cost of testing the filter socks It is probably easiest to simply dispose of the spent filter socks in drums at a cost of • approximately $100 per 55 gallon drum For each of the Regenesis filter sock products there are the following approximate unit disposal charges Filter Sock Size Number/55 gal Drum Unit Disposal Cost 6-inch diameter 15 to 20 $3.75 to $5 00 4-inch diameter 45 to 60 $1.25 to $1.66 2-inch diameter 110 to 150 $0.50 to $0.66 In a typical scenario, 150 socks would be in a barrier, and would be changed out twice a year A total of 300 socks would therefore cost between $ 150 and $1500 per year for disposal depending on size, not including drum cost and labor for retrieval and handling EENE 1 ----------------------------------------------------------------------------- Bioremediation Products 27130A Paseo Espada, Ste 1407, San Jean Capistrano, CA 92675 Phone 714-4.43-3136 Fax 714-443-3140