OHA Drinking Water Services
Contact Report Details
|PWS ID:||OR41 00030|
|PWS Name:||SHOREWOOD ESTATES|
|Who Was Contacted:||Adair Ambrose|
|Contacted By:||WRAY, JULIE (DWP)|
|Assistance Type:||CIRCUIT RIDER ASSISTANCE|
|Details:||Dan Vaage visited the site on 01/14/2019 and noticed that neither of the two wells appeared to be properly vented. If the casing seal has been compromised, (almost every time you have coliform hits off the source, this is the case) a non-vented cap will make the problem even worse by creating a suction in the well every time the well pump turns on. This can actually suck surface water down the outside of the casing and into the well. I recommend installing proper, downward-facing screened vents on both of the well caps. This would slow or possibly fix the coliform problem at Shorewood.
Further, both wells are located in low spots in the surrounding grade, this will cause surface water to pond around the casing, also not great if the casing seal is not good. At a minimum, an attempt should be made to build up the grade surrounding the well slabs. Subsurface drainage may also help to prevent water ponding around the wells.
If neither of these options make the coliform issue go away, Shorewood should plan to install disinfection (most likely chlorination) on their water system.