AUTHORITY: Implementing and authorized by Section 14.3 of the Environmental Protection Act (Ill. Rev. Stat. 1987, ch. 111 1/2, par. 1014.3).
SOURCE: Adopted at 12 Ill. Reg. 14134, effective August 25, 1988.
SUBPART A: INTRODUCTION
Section 671.101 Purpose
a) Section 14.2 of the Act establishes a minimum setback zone for existing or permitted community water supply wells or other potable water supply wells.
b) Section 14.3 of the Act authorizes a maximum setback zone to be established for community water supply wells.
c) In order to establish a maximum setback zone, the lateral area of influence of the well under normal operational conditions must be determined.
d) Owners of community water supplies which utilize any water well, or any county or municipality served by any community water supply well, may determine the lateral area of influence of the well under normal operational conditions. The Agency shall adopt procedures by which such determinations may be made including, where appropriate, pumping tests and estimation techniques. Section 14.3(a) of the Environmental Protection Act (Ill. Rev. Stat. 1987, ch. 111˝, par. 1014.3(a)).
e) The rules set forth in this Part describe the procedures for establishing a maximum setback zone under Sections 14.3(a), 14.3(b), and 14.3(c) of the Act.
f) The rules set forth in Subpart B describe the procedures to be used by owners of community water supplies, by counties, or by municipalities to determine the lateral area of influence of community water supply wells. The rules set forth in Subpart C describe the procedures to be used by counties or municipalities in requesting Agency review and confirmation of this determination.
Section 671.102 Definitions
a) Unless specified otherwise, all terms shall have the meanings set forth in the Act and the Illinois Groundwater Protection Act (Ill. Rev. Stat. 1987, ch. 111˝, pars. 7451 et seq.).
b) For purposes of this Part, the following definitions apply:
"Act" means the Environmental Protection Act (Ill. Rev. Stat., 1987, ch. 111˝, pars. 1001 et seq., as amended).
"Agency" means the Illinois Environmental Protection Agency.
"Certified professional geologist" means a person certified by the American Institute of Professional Geologists.
"Confined aquifer" means an aquifer bounded above and below by impermeable beds or by shale, clay, or siltstone.
"Drawdown" means the change in the water elevation of the static water level produced by a pumping well.
"Normal operational conditions" mean capability of a well at or under the safe yield rate.
"Professional judgment" means the use of those engineering principles and practices used by engineers when fulfilling their requirements of this Part and as certified by a Professional Engineer licensed under the Illinois Professional Engineering Act (Ill. Rev. Stat. 1987, ch. 111, par. 5101 et seq.), or the use of those geologic principles and practices used by geologists when fulfilling their requirements and duties consistent with the specific requirements of this Part and as certified by a certified professional geologist who is a member of the American Institute of Professional Geologists (7828 Vance Drive, Suite 103, Arvada, Colorado 80003, January 17, 1988).
"Registered professional engineer" means a person registered under the provisions of the Illinois Professional Engineering Act (Ill. Rev. Stat. 1987, ch. 111, par. 5101 et seq.).
"Safe yield rate" means the rate (in gallons pumped per minute per foot of drawdown) at which water can be withdrawn from an aquifer without depleting the supply.
"Unconfined aquifer" means an aquifer other than a confined aquifer.