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1 1) <br /> . 2 0 TREATMENT SYSTEM DESIGN <br /> AGE proposes the use a three 2,000-pound granular activated carbon (GAC) absorption vessel to <br /> address TPH-g,BTEX and MTBE and to ensure treatment of MTBE in the extracted ground water <br /> Prior to chemical processing,extracted ground water will be routed into a 550-gallon poly holding <br /> tank used to store extracted water and sediment This tank is equipped with upper and lower level <br /> control switches that serve to control the rate at which extracted water is introduced into the closed- <br /> loop air stripper to provide safety shutoff capabilities and to allow coarse sediment to settle out prior <br /> to treatment An emergency shut-off switch will be located immediately below the top of the raw <br /> holding tank <br /> A "low" float control switch will be placed approximately 8 inches above the base of the holding <br /> tank to activate the process pump, located within the holding tank The raw water will pass through <br /> the treatment media the will consist of two 1,000-pound GAC absorption vessel The GAC vessel <br /> is designed to adsorb TPH-g,volatile organic compounds (VOCs) and MTBE <br /> The estimated ground water extraction flow rate will be between two and four GPM AGE <br /> anticipates the total ground water extraction flow rate to be four to five GPM from the individual <br /> well,therefore active ground water extraction may need to be alternated between wells to control the <br /> volume of produced water Sample collection ports will be located in appropriate positions <br /> downstream of the the GAC vessel to allow raw water sampling to detect potential process break <br /> through and to obtain final discharge samples <br /> Electricity is readily available to the site, a dedicated electncity meter will be installed by <br /> representatives of AGE,that will connect directly to the pump and treat system The location of the <br /> ground water pump and treat system is proposed to be at the east corner of the site (Figure 2) The <br /> proposed location of the pump and treat system will allow the site to conduct day-to-day business <br /> without interference by operation of the remediation system The pump and treat system will be <br /> secured in a chain-Imked,gated enclosure approximately 15 feet wide, 15 feet long and six feet high <br /> A generalized design of the treatment system is depicted an Figure 2 <br />