Oregon Administrative Rules › Chapter 690 - WATER RESOURCES DEPARTMENT › Division 240 - CONSTRUCTION, MAINTENANCE, ALTERATION, CONVERSION AND ABANDONMENT OF MONITORING WELLS, GEOTECHNICAL HOLES AND OTHER HOLES IN OREGON › Section 690-240-0410 - Monitoring Well Construction: General

Current through Register Vol. 63, No. 7, July 1, 2024
(1) Monitoring well
			 components, including well screens, casings and annular sealant should be
			 selected based on known site characteristics to ensure the well will last for
			 the duration of the monitoring program.
(2) No monitoring well shall be used for
			 domestic, public water supply, industrial, commercial, or agricultural purposes
			 unless it meets the minimum construction standards for water supply wells, OAR
			 690-200 to 690-230.
(3) No
			 completed monitoring well shall interconnect aquifers, including low yielding
			 aquifers.
(4) The start card number
			 shall be permanently attached, stamped or engraved on the outer well casing or
			 permanent protective well cover, not on a removable cap.
(5) No monitoring well shall be constructed
			 as a multiple completion well without prior special standard approval as
			 specified in OAR 690-240-0006.
(6)
			 Horizontal wells shall only be constructed with prior special standard approval
			 only as specified in OAR 690-240-0006.
(7) The borehole diameter shall be at least
			 four inches larger than the nominal casing diameter except as noted in OAR
			 690-240-0525  concerning piezometers. If the monitoring well is constructed
			 using a hollow stem auger drilling machine, the inside diameter of the auger
			 must be at least four inches larger than the nominal diameter of the casing to
			 be installed, except as noted in OAR 690-240-0525  concerning
			 piezometers.
(8) Materials which
			 foster or promote undesirable organic growth or have the potential to degrade
			 water quality shall not be employed in the construction of the monitoring
			 well.
(9) After completion, the
			 landowner is responsible for maintaining the well in an approved condition. If
			 the well is damaged, the well protection system and casing shall be restored as
			 prescribed by these rules. If the well is damaged beyond repair, the well shall
			 be properly abandoned in accordance with OAR 690-240-0510.
(10) A well identification label shall be
			 attached to every new well and to every altered or repaired well that does not
			 already have a label. The label must be easily visible on the outside of the
			 casing on an above grade completion and inside the vault of a flush grade
			 monument. In cases where a geotechnical hole or other hole is converted into a
			 monitor well, a well identification label must be attached to the completed
			 well in the same fashion as required for a new or altered well.
(11) Any deviation from these rules requires
			 special standard approval as specified under OAR 690-240-0006.
Appendices referenced are available from the
				  agency.
Statutory/Other Authority: ORS
				  536.090, ORS
				  537.505-537.795, ORS
				  536.900, ORS
				  536.027 & ORS
				  537.992
Statutes/Other Implemented: ORS
				  536.090, ORS
				  537.505-537.795, ORS
				  536.900 & ORS
				  537.992