OAR 690-240-0510
Abandonment of Monitoring Wells


Proper abandonment of monitoring wells will prevent both vertical movement of water within the well bore and infiltration of surface water into the well:

(1)

In areas where groundwater contamination has been identified, except as described in number (4) below, abandonment shall require the borehole to be completely redrilled to a minimum of the original diameter. All casing, screen, annular sealing material, drill cuttings, debris, and filter pack material shall be removed prior to sealing.

(2)

In areas where groundwater contamination has not been identified, if it can be verified that the monitoring well was constructed in accordance with these rules, it shall be abandoned by filling the well from the bottom up with an approved sealant as described in OAR 690-240-0475 (Well Seals). The casing shall then be removed below grade, as compatible with local site conditions and land practices. The following are acceptable methods of original well construction verification:

(a)

A well report in accordance with OAR 690-240-0395 (Monitoring Well Report Required (Monitoring Well Log));

(b)

Well construction information submitted to the Oregon Department of Environmental Quality;

(c)

Information obtained through down-hole geophysical logging; or

(d)

Other information as approved by the Water Resources Department.

(3)

In areas where groundwater contamination is not present, and if the monitoring well construction cannot be verified by means listed in section (2) of this rule, the well shall be abandoned according to section (1) of this rule.

(4)

In contaminated areas where remediation has occurred, an approved special standard is required to abandon a well unless it is abandoned according to section (1) of this rule. Abandonment procedures will be considered on a case by case basis. The Department will consult with the state or federal agency that supervised the remediation in determining the appropriate abandonment method. In cases where there was no agency oversight, the Department will consider any information supplied by the licensed and bonded Monitoring Well Constructor in determining the appropriate abandonment procedure.

(5)

Grout slurries shall be placed from the bottom up by a grout pipe to avoid segregation or dilution of the sealant. The discharge end of the grout pipe shall be submerged in the grout to avoid breaking the seal while filling the annular space. Grout slurries used to abandon monitoring wells shall conform to the requirements of OAR 690-240-0475 (Well Seals).

(6)

The abandonment procedure shall be recorded on a form provided by or previously approved in writing by the Department. The form shall include, as a minimum, all the requirements as listed in OAR 690-240-0395 (Monitoring Well Report Required (Monitoring Well Log)), plus:

(a)

Method of abandonment;

(b)

If assigned, the well identification number, original start card number, and owner’s well number of the abandoned well.

(7)

When abandoning artesian monitoring wells, in addition to sections (1)-(6) of this rule, the flow shall be confined or restricted by cement grout applied under pressure, or by the use of a suitable well packer, or a wooden plug placed at the bottom of the confining interval immediately above the artesian water bearing zone. An approved grout shall be used to fill the well to land surface as specified in OAR 690-240-0475 (Well Seals).

(8)

Monitoring wells that were constructed under special standards will require the abandonment method to be approved by the Department.

Source: Rule 690-240-0510 — Abandonment of Monitoring Wells, https://secure.­sos.­state.­or.­us/oard/view.­action?ruleNumber=690-240-0510.

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 690-240-0510’s source at or​.us