OAR 690-215-0060
Access Ports, Dedicated Measuring Tubes and Airlines
(1)
All water supply wells, including wells that have been temporarily removed from service, temporarily abandoned due to a recess in construction, or temporarily abandoned before commencing service, shall be properly covered and shall be equipped with a usable access port with a minimum diameter of 1⁄2-inch for the purpose of determining the water level in the well at any time.(2)
Dedicated measuring tubes are recommended to be installed on all water supply wells at the time of pump installation, pump repair, or pump replacement. Where required, dedicated measuring tubes shall be a minimum of 3⁄4-inch diameter schedule 40 PVC extending to the top of the pump. The 3⁄4-inch diameter dedicated measuring tube may be reduced in size to 1⁄2-inch where it goes through the watertight well cap, but shall not be reduced in size over the length of the pipe. Dedicated measuring tubes shall be vented above and below the well cap and shall be attached to the pump column at 10 foot intervals with 10 mil plastic tape. The lower five feet of the dedicated measuring tube shall be either 0.020 inch machine slotted well screen or the lower 20 feet of the dedicated measuring tube shall be extensively perforated with 1⁄8 inch holes. Dedicated measuring tubes shall be plugged or capped at the bottom (See Figure 200-5) and shall remain free from wire or other obstruction.(3)
An airline is not a substitute for a required dedicated measuring tube and, if installed, must enter the well in a location other than the access port.(4)
Access ports, dedicated measuring tubes or airlines on all water supply wells shall be capped and a minimum of twelve inches above finished ground surface or pumphouse floor. If the well has a pitless adaptor then the dedicated measuring tube shall terminate within six inches of the top of the well casing.(5)
Access ports, airlines and dedicated measuring tubes on all water supply wells shall be maintained by the landowner in a condition that will prevent contamination of the groundwater resource.
Source:
Rule 690-215-0060 — Access Ports, Dedicated Measuring Tubes and Airlines, https://secure.sos.state.or.us/oard/view.action?ruleNumber=690-215-0060.