OAR 690-240-0525
Piezometers

It is prohibited to construct a piezometer in an area of known or reasonably suspected contamination.
NOTE: The Water Resources Department and the Department of Environmental Quality have information sources to use in determining if contaminants are present. Customary drilling practice as conducted by licensed professional must be included as part of the appropriate inquiry to determine if contaminants are present or reasonably suspected.

(1)

A piezometer is defined in OAR 690-240-0010 (Definitions)(59). Piezometers are a type of monitoring well and shall meet current monitoring well rules except for the following:

(a)

Borehole size with depth requirements:

(A)

For piezometers with a sealing depth less than 50 feet deep, the borehole diameter shall be at least two and one half inches (2.5") larger than the nominal casing diameter. If the piezometer is constructed using a hollow stem auger drilling machine, the inside diameter of the auger must be at least 2.5 inches larger than the nominal diameter of the casing to be installed;

(B)

For piezometers with a sealing depth greater than 50 feet deep, the borehole diameter shall be at least three inches larger than the nominal casing diameter. If the piezometer is constructed using a hollow stem auger drilling machine, the inside diameter of the auger must be at least 3 inches larger than the nominal diameter of the casing to be installed.

(b)

Surface Completion:

(A)

Piezometers shall be protected as described in OAR 690-240-0420 (Well Protection) concerning monitoring wells.

(c)

If an artesian piezometer flows at land surface, it shall be equipped with a control valve or a watertight mechanical cap, so that all flow of water from the well can be completely stopped. Flowing artesian piezometers are not required to be equipped with a pressure gauge placed on a dead-end line or a petcock valve;

(d)

The special cleaning and drill cutting storage requirements in OAR 690-240-0450 (Cleaning) shall not apply to piezometers because they may not be constructed in areas of known or reasonably suspected contamination. However, all equipment and materials used in the construction of a piezometer shall be free of foreign materials and contaminants prior to entry into the well;

(e)

Use of commercially fabricated screens are not required for piezometers. The screens installed shall be in new or like new condition, being free of pits or breaks, and shall be free of foreign materials and contaminants prior to installation;

(f)

The filter pack requirements of OAR 690-240-0460 (Monitoring Well Screen, Filter Pack, and Filter Pack Seal)(5) shall not apply to piezometers because they are not constructed in areas of known or reasonably suspected contamination;

(g)

A minimum three foot annular seal is required. If a grout slurry is used, the filter pack seal requirements of 690-240-0460 (Monitoring Well Screen, Filter Pack, and Filter Pack Seal)(6) apply. If a piezometer is completed with a flush monument, the annular seal shall extend a minimum of three feet below the monument seal.

(2)

Piezometer well abandonment: Piezometer wells shall be abandoned as described in OAR 690-240-0510 (Abandonment of Monitoring Wells) concerning monitoring wells.

Source: Rule 690-240-0525 — Piezometers, https://secure.­sos.­state.­or.­us/oard/view.­action?ruleNumber=690-240-0525.

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 690-240-0525’s source at or​.us