Mr. Erik Milito - The House Committee on Natural Resources ...

4 API GUIDANCE DOCUMENT HF2
2.30
solid waste
Any solid, semi-solid, liquid, or contained gaseous material that is intended for disposal.
2.31
stimulation
Any of several processes used to enhance near wellbore permeability and reservoir permeability, including hydraulic
fracturing
2.32
tight gas
Natural gas trapped in a hard rock, sandstone, or limestone formation that is relatively impermeable.
2.33
total dissolved solids
TDS
<strong>The</strong> dry weight of dissolved material, organic and inorganic, contained in water and usually expressed in parts per
million.
2.34
underground injection control program
UIC
A program administered by the Environmental Protection Agency, primacy state, or Indian tribe under the Safe
Drinking Water Act to ensure that subsurface emplacement of fluids does not endanger underground sources of
drinking water.
2.35
underground source of drinking water
USDW
Defined in 40 CFR Section 144.3, as follows: “An aquifer or its portion:
(a) (1) Which supplies any public water system; or
(2) Which contains a sufficient quantity of groundwater to supply a public water system;
and
(i) Currently supplies drinking water for human consumption; or
(ii) Contains fewer than 10,000 mg/l total dissolved solids; and
(b) Which is not an exempted aquifer.”
2.36
water quality
<strong>The</strong> chemical, physical, and biological characteristics of water with respect to its suitability for a particular use.
2.37
watershed
All lands which are enclosed by a continuous hydrologic drainage divide and lay upslope from a specified point on a
stream.
2.38
well completion
See completion.