2007-11-14 CC Packet - Laserfiche WebLink

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for contaminants to affect the quality of deep wells. However, pollutants entering an abandoned well through a damaged cap or corroded casing are rapidly introduced to the aquifer that could contaminant the water supply of nearby wells. The City has performed a survey of each property within its DWSMAs to determine their potential to have a well. The survey compared the recorded year of construction with the year that City water was made available. Buildings constructed before City water was available are determined "probable" to have a well on the property. Buildings constructed in the same year that Centerville water main was available for connection, or later, are determined "not probable" to have a well on the property. The status (in use, not in use, abandoned/unsealed, or sealed) of "probable" wells was not determined. The Minnesota Department of Health is the authority that regulates well construction, maintenance, and sealing in accordance with Minnesota Statute Chap. 103/ and Minnesota Rules Chap. 4725. Of the 397 parcels located within the City's DWSMAs, 94 have been identified as probable to contain a well. Of these probable well sites, 71 parcels do not currently have a City water main available. Matching the property locations with the Minnesota Department of Health's well records has identified that one of the probable well sites has had a well sealed. Appendix 1 provides the results of the Well Probability Study for properties within the City's DWSMAs that are probable to have a well. Potential Contaminant Source Inventory Centerville's Well #2 DWSMA has been classified as vulnerable to contamination from surface and near surface contaminant sources. To assess the risk to Well #2, the City has developed an inventory of potential contaminant sources within the D\NSMA from information provided by the State and Anoka County Community Health and Environmental Services. The Potential Contaminant Source Inventory (peS!) includes: registered hazardous substance storage tanks; leaking underground storage tanks; removed storage tanks; licensed hazardous waste generators; licensed agricultural chemical storage sites; and soils and groundwater clean up sites. The pesl was developed utilizing the Anoka County Environmental Site Inventory Database that is a parcel specific. Other potential contaminant sources that cross through multiple parcels (e.g. petroleum transmission pipelines) are address in the following sections of this chapter. Table 2 provides the results of the City's PCSI. Contaminant sources may be introduced or removed from the City's DWSMA as ownership or land use changes. The PCSI has identified seven properties having potential contaminant sources. It is noted that the identified potential contaminant sites are commercial, industrial, or exempt land use. An exception is one residential-commercial property having a single family house and commercial building. Public Utilities Public utilities including roads, storm and sanitary sewers, and gas/oil transmission pipelines are constructed, maintained and monitored under Federal and State guidelines to prevent and respond to contaminant releases. Pipelines (Transmission) No gas/oil transmission pipelines are identified within the City's July 3, 2007 DRAFT Centerville Wellhead Protection Plan (Part 2) Page 6