ARCHIVED REPORTS XR0009921 - Laserfiche WebLink

Home Browse Search

Corrective Action Plan Page 23 will serve to secure the treatment equipment and screen it from view so that there will be mmimal visual impact resulting from the installation Electrical power (480V, 3 phase) for the treatment equipment, will be brought to the site by overhead lines strung between one of the existing Pacific Gas and Electric Company (P ' G& E ) power poles located in the lane behind Tracy Feed and Supply at 1031 "F" Street (see Figure 6 for location) and a new pole (System 15 on Figure 10) erected within the proposed enclosure Gates in the enclosure fencing will provide access for system ' maintenance and replacement of consumable materials Principal Process Units The principal process units and equipment in the groundwater treatment system are as follows Air Stripper. The primary system for removing components of gasoline from groundwater ' pumped from the recovery wells will be a modular, low-profile air stripper (System 1 on Figure 10)that removes volatile organic compounds (VOCs) from the water This unit has a hydraulic capacity of 45 gpm and is equipped with four aeration trays and a blower capable of generating 300 cfm (cubic feet per minute) of forced air The influent stream of contaminated water is sprayed into the top of the air stripper through a course-mist spray nozzle The water then flows downward over the stack of four baffled aeration trays The stream of forced-air generated by the blower enters the bottoms of the trays through 3116 in diameter holes This forms a froth of bubbles in the water and generates a large mass-transfer surface area where the contaminants are volatized The size and number of trays in the stack is selected to achieve the required volatization The treated water falls into a reservoir in the bottom of the unit and is ' discharged from 4there by means of a pump After exiting from the top of the stack of aeration trays, the air stream carrying the valorized VOCs is exhausted from the top of the ' umt via a chimney After passing through the air-stripper, the water stream is pumped through a pair of granular, activated-carbon (GAC), adsorption vessels (System 8 on Figure 10) which are connected in series Each vessel has a hydraulic capacity of 50 gpm and contains a 1000 lb charge of activated carbon derived from bituminous-coal The purpose of these units is to remove any traces of long carbon-chain components of gasoline that might remain in the water stream after it has passed through the air stripper They also provide a conservative defense against discharge of any water containing ' impermissible concentrations of fuel hydrocarbons that might pass through the air stripper in the event of an equipment upset ' The series arrangement of the pair of GAC units provides for the upstream unit to serve as the primary means of removing any components of gasoline not removed from the water stream by the air stripper The quality of water exiting the first unit is monitored by