A controlled list that indicates the target being investigated by thisfeature: Deep Foundation - investigation of deep foundation elements. Earthworks -earth materials excavated and/or emplaced by engineering activity. GroundImprovement - activities designed to alter the characterstics of natural ground.Ground Water - hydrology and chemistry of ground water. Indoor Atmosphere -meteorology and chemistry of air in indoor spaces. Material Sample - a sample ofmaterial not derived from other enumerations in this list. Natural Ground - earthmaterials sampled in natural or undisturbed state. Outdoor Atmosphere - meteorologyand chemistry of air in outdoor spaces. Surface Water - hydrology and chemistry ofsurface water.