Agenda - Council - 10/14/2008 - Laserfiche WebLink

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CASE# Jr CONSID&R WELLHEAD PROTECTION IMPLEMENTATION ACTION PROGRAM By., Steven Jankowski, City Engineer Backoroundx The City of Ramsey is required to prepare a wellhead protection plant. For the purpose of safeguarding areas which recharge aquifers from which the City draws its municipal water supply. The Engineering Department is preparing this plan with the; assistance of the Community Development Department It is scheduled to be submitted to the Minnesota Department of Health at the end of September, The purpose of this case is to present a brief overview of the contents of the plan and to. review the slate of possible implementation action elements suggested by the Department of Health for aquifers having a moderately vulnerable rating, The City of Ramsey produces all of its municipal water supply from eight wells located within two separate well fields, Wells 1 & 2 are located within the East well field which has been designated as having low vulnerability to contamination due to factors which include: good geologic protection; documentation of sound well construction; and the lack, of any sustained water quality issues, Wells 3 through S are located in the West well field which has been d designated as having moderate vulnerability to contamination due to tactors which include: the possibility that water may be recharging via vertical leakage from the sand and gravel aquifer above; the presence of tritium suggesting that the groundwater is relatively young; and that there: is a lack of clay overlying the bedrock at Well S, Attached to this case are two figures illustrating the following elements in each well field: • Municipal well locations ent zone -the innermost' circle .around each well were • The emergency managem stringent separation distances to potential contaminants should be maintained. • Thg well head protection area (WHPA) - the next outer ring.. around each well that represents the extent of the area from which groundwater would travel to the; well within a 10year period at projected pumping rates. R The Drinking Water Supply Management Area (DWSMA) -the outermost line designated on the map which follows recognizable boundaries, This is the area within which wellhead protection activities are to be implemented to safeguard the wolfs from Contamination, Observations'. The City's wellhead protection plan is to be tailored to its vulnerability classifications. Contamination threats to low and moderately vulnerable aquifers such as 'Ramsey's include; other wells; underground or above ground Storage tanb, shallow disposal -type wells; and high N -211'-