Connecticut Administrative Code › Title 22a - Environmental Protection › 354b - Level A Mapping › Section 22a-354b-1 - Regulations for mapping wells in stratified drift aquifers to level A standards

Current through July 10, 2024
(a)
Definitions.
(1) The definitions
			 of the following terms used in this section shall be the same as the
			 definitions in Section
			 22a-354h of the
			 general statutes: aquifer; aquifer protection area; area of contribution;
			 municipality; recharge area; stratified drift; well field.
(2) The definition of "water company" shall
			 be the same as the definition in Section
			 25-32a
			 of the general statutes.
(3) As
			 used in this section:
"Aquifer test" means a yield test conducted for the purposes of
				evaluating the capacity of a well or well field for withdrawing water from an
				aquifer, of analyzing the hydraulic properties of the aquifer, of evaluating
				the effects of induced infiltration on surface water bodies, and/or of
				identifying the effects of other boundaries on the pumping well(s).
"Area of influence" means the land area that directly overlies
				and has the same horizontal extent as the part of the water table or other
				potentiometric surface that is perceptibly lowered by the withdrawal of water.
				The area of influence delineated by the use of modeling shall be that area of
				land in which the water table or potentiometric surface is lowered by at least
				0.5 feet.
"ASCII" means American Standard Code for Information
				Interchange.
"Calibration" means the adjustment of model input data for the
				purpose of matching model-generated output with field-measured values.
"Commissioner" means the Commissioner of Environmental
				Protection or his designated agent.
"Conceptual model" means a qualitative description of the
				physical characteristics and operating processes of an aquifer system.
"Critical drought event for stream flow" means the lowest
				average stream flow over a continuous period of seven days with a calculated
				return frequency or recurrence interval of once in every ten years.
"Hydraulic boundaries" means boundaries as described in the
				U.S. Geological Survey publication entitled,
Techniques of Water
				Resources Investigations of the United States Geological Survey
,
				Book 3, Chapter B5, "Definition of Boundary and Initial Conditions in the
				Analysis of Saturated Ground-Water Flow Systems - An Introduction," O. Lehn
				Franke, Thomas E. Reilly, and Gordon D. Bennett, 1987.
"In use," when referring to existing well fields in use, means
				well fields in which any constituent well is identified, in the water supply
				plan which is current as of the date that level A maps are required to be
				complete under section
				22a-354c
				and
				22a-354d
				of the general statutes, as an active source of supply and which is not
				identified as solely an emergency source of supply.
"Indirect recharge area" means an area from which water by
				overland flow or ground-water discharge is contributed to a surface watercourse
				which flows into the area of contribution.
"Initial setback" means a distance from a pumping center that
				would represent the radius of an area approximately equal to the area of
				influence, as determined from Level B mapping.
"Level B mapping" means a methodology to map the locations of
				existing and potential well fields, as required pursuant to Section
				22a-354b
				of the general statutes.
"Model" means a representation of a natural system consisting
				of a mathematical representation of two- or three-dimensional flow in an
				aquifer based on differential equations known to govern ground-water
				flow.
"Sensitivity analysis" means an analysis which determines the
				degree of influence that various input parameters have on model results by
				varying individual input parameter values during a series of
				simulations.
"Simulation" means the use of an operating model of a system or
				process.
"Sink" means a process whereby, or a feature from which, water
				is extracted from the ground-water flow system.
"Stratified drift aquifer" means a predominantly sorted
				sediment laid down by or in meltwater from glaciers and includes sand, gravel,
				silt and clay arranged in layers.
"Source" means a process whereby, or a feature from which,
				water is added to the ground-water flow system.
"Steady state flow" means a condition in which the amount of
				water flowing into a defined volume of the aquifer is equal to the amount
				flowing out of that volume. Under steady state flow conditions the head
				distribution in an aquifer is constant over time.
"Transient flow" means a condition in which the amount of water
				flowing into a defined volume of the aquifer is equal to the amount flowing out
				of that volume plus or minus some amount of water held in the volume as
				storage. Under transient flow conditions the head distribution in an aquifer
				varies as a function of time.
"Verification" means demonstration of a calibrated model's
				ability to simulate an historic hydrologic event for which field data are
				available.
"Water budget mass balance" means an accounting of volumes and
				rates of water gains and losses from ground water, produced by a computer model
				simulation.
"Water supply plan" means a plan prepared by a water company
				serving more than 1000 persons and approved by the Department of Health
				Services pursuant to section
				25-32d of the
				general statutes.