- Rainwater contaminated ground tank total volume of 11.40 cubic meters, including an area of storage tanks, new areas of pumps and wells Remote Impouding Basin of 8.78, 1.83 and 0.79 cubic meters respectively, the rain that fell in the yard bucket and space. pump Will flow to the pond, Remote Impounding Basin by rain water to flow into the engine oil (API Oil Separator) and water through separate grease will then be gathered sent to a clarifier effluent of the production lines at two. (Wastewater Hold Up Tank; TK809Zs) to wells check (Inspection Pit) before draining rainwater through the threshold of Hemaraj Eastern Industrial Estate (Rayong) set into drainage gutters of Hemaraj Eastern Industrial Estate (Rayong) and send. into the sewage system of public estates next.