1. (1) Uncased portions of water supply wells to be permanently abandoned shall be completely filled with cement grout, concrete or unhydrated bentonite: (See Figure 220-1) (Figure 220-2)

2. (2) Uncased portions of water supply wells that penetrate a water-bearing formation may be abandoned with alternating layers of cement grout, concrete or unhydrated bentonite and clean gravel throughout the water-bearing zones in the following manner:

   1. (a) In all cases, non water-bearing zones shall be filled with cement grout, concrete or unhydrated bentonite.

   2. (b) Clean gravel may only be placed in the water-bearing zones verified by an original water supply well report or other documentation acceptable to the Department. A vertical column of gravel that exceeds a total length of 50 feet shall only be placed with prior Department approval. Non water-bearing portions shall be filled with a plug of cement grout, concrete or unhydrated bentonite. Gravel shall not exceed a maximum of 50% of well depth without prior Department approval. Gravel may be placed in multiple water-bearing zones, not to exceed 50 feet for each zone. In no case shall gravel be placed above 18 feet below land surface.

      [ED. NOTE: To view attachments referenced in rule text, click here for PDF copy.]

Statutory/Other Authority

ORS 536.090 & ORS 537.505 - 537.795

Statutes/Other Implemented

ORS 536.090 & ORS 537.505 - 537.795

History

WRD 4-2023, minor correction filed 05/15/2023, effective 05/15/2023
WRD 3-2008, f. 12-22-08, cert. ef. 1-2-09
WRD 7-2001, f. & cert. ef. 11-15-01
WRD 8-1993, f. 12-14-93, cert. ef. 1-1-94
WRD 9-1978, f. 12-12-78, ef. 1-1-79, Renumbered from 690-063-0012
WRD 3, f. & ef. 2-18-77