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1.1.13 DRILLED WELL. "Drilled Well," means a well for which the hole is excavated by mechanical means such as the rotary, auger or cable tool methods. 1.1.14 DRILLING FLUID. "Drilling Fluid" is a fluid used in drilling operations to remove cuttings from the borehole, to clean and cool the bit, to reduce friction between the drill stem and the borehole wall and to prevent caving or sloughing of the hole. 1.1.15 DRILLING FOAM. "Drilling Foam" is a foam used in drilling operations to remove cuttings from the borehole, to clean and cool the bit, to reduce friction between the drill stem and the borehole wall and to prevent caving or sloughing of the hole. 1.1.16 ENFORCING AGENCY. "Enforcing Agency" means an agency designated by duly authorized local, regional or state government to administer laws, ordinances and standards pertaining to the construction, maintenance, and destruction of wells; hereafter referred to in these standards as the Environmental Health Department(EHD). 1.1.17 EXPLORATION HOLE (or BORING). "Exploration Hole or Boring" means an uncased excavation whose purpose is the immediate determination of geological conditions at a site. 1.1.18 EXTRACTION WELL. "Extraction Well" means a well constructed for the purpose of extracting contaminants from the ground water or altering the gradient of the water table. 1.1.19 FILTER PACK MATERIAL. "Filter Pack Material" means a material placed between the borehole and the slotted casing to act as a filtering medium for the groundwater. 1.1.20 GEOPHYSICAL WELL. "Geophysical Well" means a well for immediate testing or logging strata or to obtain soil or water data from the underground. 1.1.21 GEOTECHNICAL WELL. See "Geophysical Well". 1.1.22 GROUNDWATER. "Ground Water" means that part of the subsurface water which is in the zone of saturation. 1.1.23 GROUT. "Grout" means a fluid mixture of cement or other approved material and water of a consistency that can be forced through a pipe and placed as required to form a watertight seal. Various additives, such as sand, Bentonite and hydrated lime are used to meet certain requirements. 1.1.24 HEALTH OFFICER. "Health Officer" means the Health Officer of the San Joaquin County Public Health Services or his or her designee. 1.1.25 INDIVIDUAL DOMESTIC WATER WELL. "Individual Domestic Water Well" means any water well used to supply water for domestic needs of any individual residence or system of 4 or less connections on the same parcel. EHD 43-03 Page 5 of 27 WELL STANDARDS 10/9/07