Oregon Administrative Rules
Chapter 690 - WATER RESOURCES DEPARTMENT
Division 210 - WELL CONSTRUCTION STANDARDS
Section 690-210-0420 - Surface Curbing

(1) The surface curbing required in OAR 690-210-0400 shall be of concrete, concrete tile, or steel. If concrete is used, the concrete wall thickness shall not be less than six inches. In the case of buried slab type wells, well casing meeting the minimum specifications given in 690-210-0190 through 690-210-0220 shall be used. (See Figure 210-13.)

(2) If precast concrete tile or steel casing is used for the surface curbing, the well diameter to the bottom of the surface curbing shall be eight inches greater than the outside diameter of the tile or steel, and the annular space shall be completely filled with grout in accordance with OAR 690-210-0310 through 690-210-0340. (See Figure 210-13).