OAR 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 (Special Standards).

(6)

Horizontal wells shall only be constructed with prior special standard approval only as specified in OAR 690-240-0006 (Special Standards).

(7)

The borehole diameter shall be at least four inches larger than the nominal casing diameter except as noted in OAR 690-240-0525 (Piezometers) 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 (Piezometers) 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 (Abandonment of Monitoring Wells).

(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. (See Appendix 1) 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 (Special Standards).
[ED. NOTE: Appendices referenced are available from the agency.]

Source: Rule 690-240-0410 — Monitoring Well Construction: General, https://secure.­sos.­state.­or.­us/oard/view.­action?ruleNumber=690-240-0410.

690‑240‑0005
Introduction 690‑240‑0006
Special Standards 690‑240‑0007
Special Area Standards 690‑240‑0010
Definitions 690‑240‑0011
Organic Materials 690‑240‑0012
Public Safety 690‑240‑0013
Wells Cannot Be Used for Disposal of Contaminants 690‑240‑0014
Water Used Must be Potable 690‑240‑0015
Delegation of Responsibility for Monitoring Wells, Geotechnical Holes and Other Holes 690‑240‑0016
Unattended Wells 690‑240‑0020
Delegation Conditions 690‑240‑0024
Well Identification Label 690‑240‑0026
Well Identification Label Maintenance 690‑240‑0030
Other Holes: General Performance and Responsibility Requirements 690‑240‑0035
Geotechnical Holes: General Performance and Responsibility Requirements 690‑240‑0040
Closed Loop Ground Source Heat Pump Boring — General Requirements 690‑240‑0043
Construction Standards 690‑240‑0046
Grouting of Uncased Boring 690‑240‑0049
Reporting Requirements 690‑240‑0055
License Required to Construct Monitoring Wells 690‑240‑0060
Monitoring Well Constructor License Examination 690‑240‑0065
Monitoring Well Constructor License, Experience Requirements and Trainee Card 690‑240‑0070
Terms of Monitoring Well Constructor License and License Fees 690‑240‑0200
Continuing Education Committee 690‑240‑0210
Continuing Education Requirement 690‑240‑0220
Documentation 690‑240‑0240
Approved Course List/Course Approval and Assignment of CECs 690‑240‑0250
Course Sponsor Requirements 690‑240‑0260
Loss of Approval 690‑240‑0270
Courses Taken Without Prior Approval 690‑240‑0280
Waivers 690‑240‑0320
Contracting for Services 690‑240‑0330
Monitoring Well Constructor and Landowner Well Bonds or Letters of Credit 690‑240‑0340
Landowner Well Construction Permit, Fee and Bond 690‑240‑0355
Monitoring Well Drilling Machines 690‑240‑0375
Monitoring Well Construction Notice Required (Start Card) 690‑240‑0385
Start Card Reporting Requirements 690‑240‑0395
Monitoring Well Report Required (Monitoring Well Log) 690‑240‑0410
Monitoring Well Construction: General 690‑240‑0420
Well Protection 690‑240‑0430
Casing 690‑240‑0440
Additional Standards for Artesian Monitoring Wells 690‑240‑0450
Cleaning 690‑240‑0460
Monitoring Well Screen, Filter Pack, and Filter Pack Seal 690‑240‑0475
Well Seals 690‑240‑0485
Monitoring Well Development 690‑240‑0500
Completion of Monitoring Wells 690‑240‑0510
Abandonment of Monitoring Wells 690‑240‑0525
Piezometers 690‑240‑0540
Direct Push Monitoring Wells and Piezometers 690‑240‑0550
Evidence of Failure 690‑240‑0560
Investigation of Alleged Violations 690‑240‑0580
Enforcement Actions 690‑240‑0590
Multiple Violations and Consolidation of Proceedings 690‑240‑0600
Factors Affecting Selection of Type and Degree of Enforcement 690‑240‑0610
Change in Enforcement Status 690‑240‑0630
Assessment of Civil Penalties 690‑240‑0640
Schedule of Civil Penalties
Last Updated

Jun. 8, 2021

Rule 690-240-0410’s source at or​.us