California Code, Water Code - WAT § 31142.24

(a) “Aquifer” means a geologic formation from which groundwater may be extracted.

(b) “Aquitard” means a geologic formation with very low permeability.

(c) “Board” means the board of directors of the district.

(d) “District” means the Alameda County Water District.

(e) “Exploratory hole” means a temporary excavation constructed by any method, for the purpose of determining subsurface geological or hydrogeological information.

(f) “General manager” means the general manager of the district.

(g) “Groundwater” means water beneath the natural surface of the ground, whether or not flowing through known and definite channels.

(h) “Other excavation” means an excavation or structure, other than a well or an exploratory hole, constructed by any method that intersects an aquifer, or that may impact the integrity of any aquitard located directly above an aquifer.

(i) “Well” means any artificial excavation constructed by any method for the purpose of monitoring groundwater levels, extracting, injecting, or circulating water, or extracting, injecting, or circulating other fluid or gas solely for the purpose of soil or groundwater remediation, beneath the natural surface of the ground.