Illinois Administrative Code › Title 35 - ENVIRONMENTAL PROTECTION › Part 620 - GROUNDWATER QUALITY › Subpart E - GROUNDWATER MONITORING AND ANALYTICAL PROCEDURES › Section 620.505 - Compliance Determination

Current through Register Vol. 48, No. 28, July 12, 2024
a)
				Compliance with standards at a site is to be determined as follows:
1) For a structure (e.g., buildings), at the
				closest practical distance beyond the outermost edge for the
				structure.
2) For groundwater that
				underlies a potential primary or secondary source, the outermost edge as
				specified in Section
				620.240(e)(1).
3) For groundwater that underlies a coal mine
				refuse disposal area, a coal combustion waste disposal area, or an impoundment
				that contains sludge, slurry, or precipitated process material at a coal
				preparation plant, the outermost edge as specified in Section
				620.240(f)(1)
				 or location of monitoring wells in existence
				as of the effective date of this Part on a permitted site.
4) For a groundwater management zone, as
				specified in a corrective action process.
5) For groundwater, any point where
				monitoring is conducted using a water well, or a monitoring well that meets one
				of the following conditions:
A) For a potable
				water supply well if geologic logs exist for this well or geologic logs in the
				immediate 1,000-foot area of this well are representative of the hydrogeologic
				materials encountered by this well as determined by a licensed professional
				geologist or a licensed professional engineer or a WHPA has been delineated
				outside of an applicable setback zone of a community water well or well field
				in accordance with the "Guidance Document for Groundwater Protection Needs
				Assessments," incorporated by reference at Section
				620.125,
				and "The Illinois Wellhead Protection Program," incorporated by reference at
				Section 620.125.
B) For a potable
				water supply well other than a community water supply well, a construction
				report has been filed with the Department of Public Health for such potable
				well, or such well has been located and constructed (or reconstructed) to meet
				the Illinois Water Well Construction Code [415 ILCS 30 ] and 77 Ill. Adm. Code
				920.
C) For a potable water supply
				well that was constructed prior to August 20, 1965, the enactment of the
				Illinois Water Well Construction Code [415 ILCS 30], and meets all of the
				following criteria:
i) Construction must be
				done in a manner that will enable the collection of groundwater samples that
				represent in situ groundwater conditions;
ii) Casings and screens must be made from
				durable material resistant to expected chemical or physical degradation that do
				not interfere with the quality of groundwater samples being collected;
				and
iii) The annular space opposite
				the screened section of the well (i.e., the space between the bore hole and
				well screen) must be filled with gravel or sand if necessary to collect
				groundwater samples. The annular space above and below the well screen must be
				sealed to prevent migration of water from adjacent formations and the surface
				to the sampled depth.
D)
				For a community water supply well, such well has been permitted by the Agency,
				or has been constructed in accordance with 35 Ill. Adm. Code
				602.115.
E) For a water well other than a potable
				water supply well (e.g., a livestock watering well or an irrigation well), a
				construction report has been filed with the Department of Public Health or the
				Office of Mines and Minerals in the Department of Natural Resources for such
				well, or such well has been located and constructed (or reconstructed) to meet
				the Illinois Water Well Construction Code [415 ILCS 30] and 35 Ill. Adm. Code
				920.
F) For a monitoring well, such
				well meets the following requirements:
i)
				Construction must be done in a manner that will enable the collection of
				groundwater samples;
ii) Casings
				and screens must be made from durable material resistant to expected chemical
				or physical degradation that do not interfere with the quality of groundwater
				samples being collected; and
iii)
				The annular space opposite the screened section of the well (i.e., the space
				between the bore hole and well screen) must be filled with gravel or sand if
				necessary to collect groundwater samples. The annular space above and below the
				well screen must be sealed to prevent migration of water from adjacent
				formations and the surface to the sampled depth.
6) Monitoring shall not be
				conducted for compliance determinations pursuant to subsection (a) of this
				Section:
A) For a water well that is:
i) Less than 15 feet in total depth from the
				land surface,
ii) bored or
				dug,
iii) constructed of permeable
				materials (e.g., cement, tile, stone or brick), and
iv) 36 inches or more in diameter.
B) For a water well with water
				quality problems due to damaged well construction materials or poorly-designed
				well construction;
C) For a water
				well in a basement or pit; or
D)
				For water well water from a holding tank.