Or. Admin. Code § 690-220-0050 - Abandonment of Uncased Wells

(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) 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:

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

(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.

Notes

Or. Admin. Code § 690-220-0050

WRD 3, f. & ef. 2-18-77; WRD 9-1978, f. 12-12-78, ef. 1-1-79, Renum?bered from 690-063-0012; WRD 8-1993, f. 12-14-93, cert. ef. 1-1-94; WRD 7-2001, f. & cert. ef. 11-15-01; WRD 3-2008, f. 12-22-08, cert. ef. 1-2-09; WRD 4-2023, minor correction filed 05/15/2023, effective 5/15/2023

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Statutory/Other Authority: ORS 536.090 & ORS 537.505 - 537.795

Statutes/Other Implemented: ORS 536.090 & ORS 537.505 - 537.795