A sump is a vessel located in a low place or below key equipment that collects waste or overflow liquids like waste oil, condensate, chemicals, or water which are collected for reprocessing or disposal. Treated wastewater or rain collection water is stored in open atmosphere sumps. Sumps are also used to collect waste product streams. They are often placed underground for ease of filling and for insulation when situated in locations with extreme climates. The sump is often accessible with only top-down measurement technology. It is sometimes desirable to also measure interface, in which case guided wave radar technology such as the Rosemount 5300 Level Transmitter is the recommended solution. For remote locations with no cable infrastructure, a wireless guided wave radar such as the Rosemount™ 3308 Level Transmitter enables efficient and accurate level control and data collection. If a non-contacting solution is preferred, the Rosemount 3408™ Level Transmitter is an alternative choice.