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S
Sand Filter System - See Recirculating Sand Filter System, or RSFS
Sanitary Sewage - Greywater and blackwater from domestic, commercial and
other non-industrial sites.
Scum (Scum Layer) - A mass of light solids, such as hair, grease, oils and soaps,
floating on the surface of the wastewater in a septic tank.
Seasonal High Ground Water Table (SHGW) - The elevation measurement of
the ground water during the wettest season of the year. Determined by
performing a soil evaluation during which mottles (rust) are observed in the soil
indicating the presence of static ground water in the soil at some point in time.
Septage - Material physically removed from any part of an on-site system;
contents of septic system.
Septage Hauler - Also known as a system pumper. Licensed by each Board of
Health to pump on-site systems and dispose of the contents as part of regular
system maintenance.
Septic Tank - A watertight receptacle that receives sewage from a building and
provides primary treatment (separation of solids and liquids and partial
biodegradation).
Shared System - A system sited and designed to serve more than one facility or
more than one dwelling on a single facility and which has been approved in
accordance with 310 CMR 15.290 - 15.293. A system serving a condominium
unit or units located on the same facility is not a shared system.
Sludge - The heavier solids that separate from wastewater inside the septic and
sink to the bottom. These solids are subject to continual decomposition activity
by bacteria in the tank; however, since breakdown is never complete, solids
accumulate and must be periodically removed by pumping.
Soil Absorption System (SAS) - Part of an on-site system: the area of ground
and system of subsurface pipes or chambers into which partially treated
wastewater from the septic tank or I/A system is discharged for final treatment
and absorption by soil. Also called Leachfield, Drainfield or Absorption Field.
Soil Evaluator - A person approved by MassDEP as capable of evaluating the
suitability of soils at a specific site for the use of an on-site subsurface sewage
disposal system.
System Inspector - A person approved by MassDEP as being capable of
appropriately assessing the condition of an on-site system.
