California Water Well Standards, DWR Bulletin 74 ... - County of Glenn

~APPEN DIX ADefinition of Terms-A metallic object designed to corrode in place of the object it is designed to protect.-A technique to prevent the corrosion of a metal surface by making that surface the.-Cement, Portland Cement -A cement that contains oxides of calcium, aluminum, iron, and silicon made byheating a mixture of limestone and clay in a kiln and pulverizing the resultant clinker, as defined inASTM C150. Portland cement is also considered a hydraulic cement, because it must be mixed with waterto form a cement-water paste with the ability to develop strength and harden, even under water.Centralizer -A device that assists in centering tubular materials in a borehole.Conductance, Specific -A measure of the ability of water to conduct electric current at 77 degrees Fahrenheit.It is related to the total concentration of ions in the water.Corrosionl -The deterioration of a material, usually a metal, because of a reaction with its environment.Drilling Fluid -A fluid (liquid or gas) used in drilling operations to remove cuttings from a borehole, to cleanand cool the drilling bit, to reduce friction between the drill stem and the borehole wall, and, in somecases, to prevent caving or sloughing of the borehole.Electrolytel -A chemical substance or mixture, usually liquid, containing ions that migrate in an electric field.The term electrolyte refers to the soil or liquid adjacent to, and in contact with a buried or submergedmetallic structure including the moisture and other chemicals contained therein.Interferencel -The situation that arises when a foreign substructure is affected in any way by a direct currentsource.Rectifierl -An electronic device that changes alternating current to direct current.1 Definition from National Association of Corrosion Engineers Standard RP-Ol-69 or RP-O5-72.-77-