Document LKE7rKgdNr2bZa5ogkBJbLMOz

VISTA CHEMICAL GROUNDWATER REMEDIATION PLAN February 6, 1991 Presently, two options are available for the remediation of the VCM groundwater. The details of each option are outlined below; the similarities and differences are presented immediately after the discussion of the two options. The last section of this document explains the purpose and/or operation of some of the key components, or processes, that are utilized in the remediation. A schematic is attached which shows the key components and flow and concentration data. Option I The groundwater is pumped from the wells to the following components/processes: 1. Collection Tank 2. Incinerator Flame Arrestor 3. Steam Stripper Feed Tank 4. Steam Stripper 5. Biological Treatment 6. Outfall Option II The groundwater is pumped from the wells to the following components/processes; 1. Collection Tank 2. Steam Stripper Feed Tank 3. Steam Stripper 4. Biological Treatment 5. Outfall Option Comparison The method of removing the groundwater from the wells and, subsequently, treating it is the same for both options. The difference between the two is that Option I will substitute the groundwater for process water in the flame arrestor, reducing the amount of process water needed by 15 to 20 gpm. Operation The key components in the remediation are: 1. Incinerator Flame Arrestor 2. Steam Stripper 3* Biological Treatment (ASU) WV 000026607 A short explanation of the operation of each component is given below. Concentration and flow data are presented on the schematic. viawe Arrestor The flame arrestor provides a liquid (water) seal between the process vent system and the incinerator. The vents (HC1, CIjj, organics, etc.) are bubbled through the liquid seal then to the incinerator. The water prevents flames from propagating upstream into the vent system, which could cause explosions. Presently, clean process (deep well) water is used for this seal. Option I would replace the process water with groundwater. Water is constantly fed to the flame arrestor and is withdrawn for treatment by a level control system. The makeup water rate is 15-20 gpm. gfceam stripper The steam stripper receives contaminated water from the various processes at the VCM Plant. Steam is utilized to strip the impurities from the stripper feed water. The overhead, or contaminates, are recycled back to the process. The bottoms, or clean water, are discharged along with other wastewaters to the secondary treatment unit for biological treatment. Biological Treatment The secondary treatment system utilizes biological treatment methods to further treat the wastewater from the steam stripper and other sources. After equalization, the activated sludge process is utilized, with clarification. This treatment is necessary to polish the B.O.D. left in the process wastewaters. VVV 000026608 BRUN?NG-40-536 70445 vvv 000026609 o NO *c 1 (V o o O K M flfc g :