A __________________ is a system designed to carry rainfall runoff and other drainage. It is not designed to carry sewage or accept hazardous wastes.

A __________________ is a sewage collection system of pipes and tunnels designed to simultaneously collect surface runoff and sewage water in a shared system.

A level of waste water treatment that removes the soluble organic matter that escapes primary treatment. It also removes more of the suspended solids. Removal is usually accomplished by biological processes in which microbes consume the organic impurities as food, converting them into carbon dioxide, water, and energy for their own growth and reproduction.

A level of waste water treatment that can remove more than 99 percent of all the impurities from sewage, producing an effluent of almost drinking-water quality.

A level of water treatment that removes material that will either float or readily settle out by gravity. It includes the physical processes of screening, comminution, grit removal, and sedimentation. Screens are made of long, closely spaced, narrow metal bars.

The ___________________treatment system consists of an aeration tank followed by a secondary clarifier. Settled sewage, mixed with fresh sludge that is recirculated from the secondary clarifier, is introduced into the aeration tank.

A ___________is a small building separate but usually near a dwelling, often referred to as an “outhouse”, used for disposal of body wastes

A ______________ is a shallow, underground system for disposing of sanitary waste. Although structures vary, most of it consist of a concrete cylinder with an open bottom and/or perforated sides.

A gas produce in septic tank that is a combination of Hydrogen and carbon, a principal components of natural gas. Tasteless, odorless and highly flammable.