ARCHIVED REPORTS XR0001659 - Laserfiche WebLink

Home Browse Search

' Final Remedial Plan - Geweke 2 January 1992 Page 13 of 15 4 . ,GROUND WATER REMEDIATION 4 . 1. PHILOSOPHY AND BACKGROUND OF THE CHOSEN TREATMENT METHOD To remove the hydrocarbon contaminants from the ground water we propose to use activated carbons. Unlike vapor hydrocarbons, the ' levels of hydrocarbon contaminants in ground water is typically low. Activated carbons are able to absorb hydrocarbon contaminants up to approximately 10% of their own weight. Although it is necessary to dispose the carbons after treatment, the volume should ' not be excessive. This method offers several distinct advantages, such as relatively simple setup, easy maintenance and moderate ' cost. ' 4 . 2 . TREATMENT METHOD AND EQUIPMENT DESCRIPTION The recovered fluid will be routed through two carbon filter canisters, which will be connected in series (Figure 6) . Each of these filters adsorbs hydrocarbon contaminants up to 10% of their own weight and is 100% effective up to the time of saturation. With an average TPH level of 20 mg/1, a carbon vessel holding 200 lbs of ' carbon could treat approximately 100, 000 gallons. As the first filter approaches saturation, it will be removed and the second filter will be moved into its place. A fresh filter canister will then be installed as the second filter. Each filter is rated to ' handle up to 10 gallons per minute. To extract the total fluid, a SOS Quick Response System (QRS) of ' Clean Environment Engineers is used. The specifications of the QRS are in Appendix 2 . The system consists of a pneumatic double diaphragm pump which, if necessary, is combined with a downhole pneumatic pump. The pump is actuated by an All-Air Control Box. Total fluid is extracted from MW-4 . The recovered fluid passes through a particulate filtration unit then through two carbon canisters connected in series, to remove hydrocarbon compounds. The ' schematic arrangement of the treatment system in Figure 6 is for presentation purposes only. The treatment system is set up in a matter to minimize the impact on the operation of the site. ' The treated water is transferred into a 4 , 000 gallon holding tank, equipped with a three stage tank-full shutoff system to prevent spillage of the pumped fluids. The shutoff system includes a high- level shutoff, a fluid activated shutoff and, should the previous two stages fail, a fluid return system routes the product back to the well. In addition, the system becomes inoperative when air pressure is' lost.