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R10/71-51-1C <br /> o Aqueous Phase Carbon Adsorption - Contaminated groundwater is passed <br /> through activated carbon contained in drums or tanks Organic compounds <br /> adhere to the carbon material and clean water emerges Once spent, the <br /> carbon is sent off site for regeneration <br /> o Coalescing - A coalescent oil/water separator will be used The separator <br /> receives oily water into an inlet chamber by pump This chamber is <br /> separated from the coalescing assembly by an inlet weir Any heavy solids <br /> settle out and the oil slugs rise immediately to the surface The remaining <br /> oily water mixture flows through the coalescing plate assembly The small <br /> oil droplets and fine solids are progressively separated A baffle or oil dam <br /> prevents the collected oil from entering the outlet weir Separated oil is <br /> 1 removed automatically This method is particularly useful in heavily <br /> contaminated groundwater especially if floating product is present <br /> After treatment of the contaminated groundwater, the treated water can then be <br /> channelled into Publicly Owned Treatment Works (POTW), the storm water sewer <br /> system, or recharged/irrigated on site These are briefly discussed below <br />' o Discharge into POTW - This alternative would utilize existing 9 sewerae 9 <br /> capacity available in the collection system as well as the treatment plant <br /> This will require permit from the POTW facility operator Risks associated <br /> with discharge include bio-conversion to unacceptable end products, <br />' concentration by absorption onto sludges which may prevent cost effective <br /> sludge management, or treatment plant worker exposure issues <br /> o Discharge into Storm Water Sewer - In general, for this to occur, a permit <br />' must be obtained in accordance with the NPDES program This Federally <br /> mandated permit is required for any discharge to a navigable water or other <br />' waters of the United States This disposal option can be implemented very <br /> easily as a permitting process is existence with the State of California The <br /> State may impose requirements on the discharge that may require backup <br />' treatment systems, holding tanks, or periodic monitoring Depending on the <br /> beneficial use of the receiving water, significant public or institutional <br /> controversies may develop over a NPDES permitted discharge <br />' o Recharge/irrigation - This requires high degree of reliability as well as <br /> extensive aquifer testing programs to determine the best areas and other <br />' requirements for the system Biological fouling and groundwater mounding <br /> are possible drawbacks to this option <br /> 30 <br />