Well 9 Drilling and Construction

2026-11-03

The City of Oak Harbor ( City ) is developing a new emergency groundwater supply at its Well 9 site . The City requires construction of a new well to replace existing Well 9 on the same parcel as shown on the attached Site Map and Vicinity Map in Exhibit B . Drilling will consist of advancing 20 - inch - diameter steel casing to a depth of 20 feet to create a sanitary seal and a 16 inch - diameter casing to a maximum depth of 250 feet which will depend on aquifer characteristics identified during drilling . The boring will be completed with a 12 - inch - diameter wire - wrapped stainless steel well screen and a sand filter pack . The City ’ s representative , RH2 Engineering , Inc . ( RH2 ) will observe drilling and testing activities and will provide a well screen design for the Contractor . The well may be drilled using either fluid rotary methods without drilling mud , or cable tool methods . The selected method must be capable of reaching the target depth , retrieving representative samples of aquifer materials as drilling proceeds , and constructing the new well . The existing well 9 well log indicates that a sand aquifer occurs at depths ranging between 180 to 243 feet below ground surface ( bgs ). Static groundwater level within the aquifer occurs at approximately 180 feet bgs . Layers of dense glacial till , and clay overlie the sand aquifer . Well driller logs for existing Well 9 and nearby wells 8 and 11 are in Exhibit A . All well drilling and construction shall comply with WAC 173 - 160 .

Washington

2026-05-14