Or. Admin. Code § 690-240-0410

Current through Register Vol. 63, No. 11, November 1, 2024

Section 690-240-0410 - Monitoring Well Construction: General

(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.

Or. Admin. Code § 690-240-0410

WRD 14-1990, f. & cert. ef. 8-9-90; WRD 8-1993, f. 12-14-93, cert. ef. 1-1-94; WRD 2-1995, f. 5-17-95, cert. ef. 7-1-95; WRD 7-2001, f. & cert. ef. 11-15-01; WRD 1-2003, f. & cert. ef. 3-14-03, Renumbered from 690-240-0100; WRD 5-2023, amend filed 06/22/2023, effective 7/1/2023

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