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3. Wellhead Protection Plan Part IICITY OF Preparing and updating a public water supply's Wellhead and Source Water Phone: 952.227.1120 MEMORANDUM CUMNSEN Recreation Center TO: Todd Gerhardt, City Manager 7700 Market Boulevard t PO Box 147 FROM: Paul Oehme, Director of Public Works /City Engineer Chanhassen, MN 55317 (WHPA). DATE: July 23, 2012 okU . Administration Y p pp Y wells. Vulnerability assessment for the public water supply Phone: 952.227.1100 SUBJ: Hold Public Hearing for Wellhead Protection Plan, Part II Fax: 952.227.1110 PW379B Building Inspections • Open house meeting (held on October 5, 2011). Phone: 952.227.1180 Fax: 952.227.1190 BACKGROUND Engineering The State of Minnesota's Wellhead and Source Water Protection regulations are Phone: 952.227.1160 covered in Rule 4720.52, administered by the Minnesota Department of Health Fax: 952.227.1170 (MDH). Wellhead and Source Water Protection Plans are mandated by these Finance regulations to help keep the ground water in the municipal supply area free from Phone: 952.227.1140 surface contaminates. These rules state municipal wellhead protection plans must Fax: 952.227.1110 be updated every 10 years. The current plan was adopted in 2002. Park & Recreation Preparing and updating a public water supply's Wellhead and Source Water Phone: 952.227.1120 protection Plan is a two -part process. Fax: 952.227.1110 Recreation Center Part 1 of the process includes: 2310 Coulter Boulevard Scientific delineation of well capture zones for a specified groundwater travel Phone: 952.227.1400 time not less than 10 years, which then defines the Wellhead Protection Area Fax: 952.227.1404 (WHPA). • Designation of a Drinking Water Supply Management Area ( DWSMA). Planning & Natural Resources Y p pp Y wells. Vulnerability assessment for the public water supply Phone: 952.227.1130 • Vulnerability assessment for the aquifer(s) within the DWSMA tapped by the Fax: 952.227.1110 public water supply wells. • Open house meeting (held on October 5, 2011). Public Works 7901 Park Place Part 2 of the process includes: Phone: 952.227.1300 • Update inventory of potential groundwater contamination sources within the Fax: 952.227.1310 portions of the DWSMA classified as vulnerable to contamination. Senior Center • Identification of issues, problems, and opportunities associated with land and Phone: 952.227.1125 water use within the DWSMA. Fax: 952.227.1110 • An assessment of how potential changes in future land and water use within the DWSMA may affect source water (i.e., aquifer) protection. Web Site • Development and implementation of a management plan to reduce the risk of www.ci.chanhassen.mn.us contamination of the drinking water supply. The following goals have been identified for Chanhassen's Wellhead and Source Water Protection Program: Chanhassen is a Community for Life - Providing for Today and Planning for Tomorrow Todd Gerhardt Wellhead Protection Plan, Part II Public Hearing July 23, 2012 Page 2 The City will work to maintain or improve the current level of water quality so that the municipal water supply will continue to meet or exceed all applicable state and federal water quality standards. The City will provide information and promote activities that protect the source water aquifers that provide water to the municipal system. This will include increasing public awareness of the Wellhead and Source Water Protection Program and groundwater- related issues, and management of the identified potential contaminant sources within the DWSMA. The City will continue to collect data to support future wellhead and source water protection efforts. The goals for the City of Chanhassen's Wellhead and Source Water Protection Program will be achieved through the following existing and planned programs: Work with other Jurisdictions in the DWSMA • Promote proper management of existing active wells in the DWSMA. Public Education • Distribution of the Chanhassen Consumer Confidence Report for the water supply system. • Distribution of information on the proper operation and maintenance of private wells. • Post WHPP information on the City of Chanhassen website. • Inclusion of wellhead and source water protection into the City's planning process. • Work with the Cities of Deephaven, Eden Prairie, Excelsior, Greenwood, Minnetonka, Orono, Shorewood, and Tonka Bay to the extent practicable to identify appropriate public education opportunities for any residents within the portions of the DWSMA that extend into these jurisdictions. • Distribution of a Wellhead and Source Water Protection informational brochure. Continued Data Collection • Record static and pumping water levels in the Chanhassen municipal wells. • Collection of additional local geologic and hydrogeologic data as it becomes available or via undertaking hydrogeologic studies. • Collection of data on potential contaminant sources within the DWSMA. SCHEDULE Public Hearing July 23, 2012 Submit Plan to Minnesota Department of Health August 3, 2012 Plan tentatively approved by Minnesota Department of Heath October, 2012 City Council Considers Final Plan approval November 13, 2012 Attachments Wellhead and Source Water Protection — Executive Summary and Exhibits Wellhead Protection Plan Brochure Website Information g: \eng \public \pw379b wellhead plan update 2010 \bkgd 072312 public hearing whpp part ii.doc Wellhead and Source Water Protection - Part 2: Wellhead Protection Plan Amendment Prepared for the Chanhassen, Minnesota May 2012 i PUBLIC WATER SUPPLY PROFILE The following persons are the contacts for the Chanhassen Wellhead Protection Plan: Public Water Supply Contact Kevin Crooks Utilities Superintendent Public Works Department City of Chanhassen 1591 Park Road Chanhassen, Minnesota 55317 Telephone: 952.227.1311 Fax: 952.474.1687 Email: kcrooks @ci.chanhassen.mn.us Wellhead Protection Manager Kevin Crooks Utilities Superintendent Public Works Department City of Chanhassen 1591 Park Road Chanhassen, Minnesota 55317 Telephone: 952.227.1311 Fax: 952.474.1687 Email: kcrooks @ci.chanhassen.mn.us Wellhead Protection Consultant John Greer, P.G. Barr Engineering Company 4700 W. 77` Street Minneapolis, Minnesota 55435 -4803 Telephone: 952- 832 -2600 Fax: 952- 832 -2601 E -Mail: jgreer @barr.com WELL NUMBER(S) 220976 200195 180913 541545 578953 709304 737048, 737049, IC WATER SUPPLY ID # 1100001 SIZE OF POPULATION SERVED 23,179 (2010 census) COUNTY Carver (14,273 acres ), Hennepin (154 acres) P: \Mpls \23 MN \10 \23101004 Chanhassen Part 1 WHPP Amendment \WorkFiles \Chanhassen WHPP Part II 2012 \Plan \Chanhassen Part 2 WHPP Amendment.doex iv DOCUMENTATION LIST Step Date Performed Scoping Meeting II Held (4720.5340, subp. 1) August 16, 2011 Scoping II Decision Notice Received (4720.5340, subp. 2) September 14, 2011 Remaining Portion of Plan Submitted to Local Units of Government (LUGs) (4720.5350) May 22, 2012 Review Received From Local Units of Government (4720.5350, subp. 2) May 23 to July 22, 2012 Review Comments Considered (4720.5350, subp. 3) July _ to July _, 2012 Public Hearing Conducted (4720.5350, subp.4) July 23, 2012 Remaining Portion WHP Plan Submitted (4720.5360, subp. 1) August _, 2012 Final WHP Plan Review Received (4720.5360, subp. 4) P: \Mpls\23 MN \10 \23101004 Chanhassen Part I WHPP Amendment\WorkFiles \Chanhassen WHPP Part II 2012\Plan \Chanhassen Part 2 WHPP Amendment.docx v Executive Summa The Wellhead and Source Water Protection Plan (WHPP) for the City of Chanhassen primarily addresses the ten municipal water supply wells used by the City. Wells 2, 3, 7, 8, 9, 10, 12, 13, and 14 are primary water supply wells and are completed in the Prairie du Chien /Jordan aquifer, Well 4 is a primary water supply well and is open to the Prairie du Chien /Jordan, Tunnel City (formerly Franconia), and Wonewoc (formerly Ironton/Galesville) aquifers. Well 11 is classified as an Emergency Backup well. The Wells 5 and 6 are currently classified as Inactive so these two wells were not included in the delineation of the Chanhassen Wellhead Protection Area. The former Middle School Well was sealed in April 2011. This Plan was prepared in accordance with the applicable portions of the State of Minnesota Wellhead Protection Rules (Minnesota Rules 4720.5100 through 4720.5590). In Part 1 of the WHPP, Wellhead Protection Areas (WHPAs) and the Drinking Water Supply Management Area (DWSMA) were delineated. The DWSMA extends into the cities of Deephaven, Eden Prairie, Excelsior, Greenwood, Minnetonka, Orono, Shorewood, and Tonka Bay. This document comprises Part 2 of the WHPP and includes the following information: • A review of data elements identified by the Minnesota Department of Health as applicable to the DWSMA. • Results of an inventory of potential contaminant sources within the DWSMA. • Review of changes, issues, problems, and opportunities related to the public water supply and the identified potential contaminant sources. • A discussion of potential contaminant source management strategies and the goals, objectives, and action plans associated with these management strategies. • A review of the Wellhead and Source Water Protection evaluation program and Chanhassen's alternative water supply contingency strategy. Part 1 of the WHPP was completed in August 2002 and updated in February 2011 to incorporate six new wells along with inclusion of fracture -flow analysis. The update was approved by the Minnesota Department of Health on May 20, 2011. In addition to the delineation of the WHPAs and DWSMAs, Part 1 of the WHPP included an assessment of the vulnerability of the Chanhassen municipal wells and the associated DWSMA to contamination. In accordance with Minnesota Rules 4720.5550, Chanhassen Well # 11 (currently an Emergency Backup well) was identified as vulnerable to surface P: \Mpls \23 MN \10 \23101004 Chanhassen Part 1 WHPP Amendment\WorkFiles \Chanhassen WHPP Part II 2012 \Plan \Chanhassen Part 2 WHPP Amendment.docx vi contamination, while the rest of the Chanhassen municipal wells were identified as being not vulnerable to surface contamination. In the Part 1 report, the uppermost source water aquifer within the DWSMA was identified as having mostly low vulnerability to surface contamination with one small area in Chanhassen near Well 11 and two areas within the Eden Prairie city limits identified as having moderate vulnerability. Since the aquifer vulnerability in the DWSMA is classified as Low or Moderate, Chanhassen's Wellhead and Source Water Protection Program is targeting non - municipal wells, potential Class V well locations (consisting of only properties associated with automotive repair since no large scale septic systems serving more than 20 people or cesspools were identified in the DWSMA, and storage tanks within the DWSMA. The City will also focus on educating city staff, residents, and business owners of the City of Chanhassen, as well as those in the portions of the cities of Deephaven, Eden Prairie, Excelsior, Greenwood, Minnetonka, Orono, Shorewood, and Tonka Bay within the DWSMA, regarding wellhead and source water protection. In addition, the City of Chanhassen will gather or compile new or updated information for future revisions of the WHPP. The following goals have been identified for Chanhassen's Wellhead and Source Water Protection Program: • The City will work to maintain or improve the current level of water quality so that the municipal water supply will continue to meet or exceed all applicable state and federal water quality standards. • The City will provide information and promote activities that protect the source water aquifers that provide water to the municipal system. This will include increasing public awareness of the Wellhead and Source Water Protection Program and groundwater - related issues, and management of the identified potential contaminant sources within the DWSMA. • The City will continue to collect data to support future wellhead and source water protection efforts. These goals will be accomplished through implementation of this WHPP The goals for the City of Chanhassen's Wellhead and Source Water Protection Program will be achieved through the following existing and planned programs: P:\Mpls \23 MN \10 \23101004 Chanhassen Part 1 WHPP Amendment\WorkFiles \Chanhassen WHPP Part II 2012 \Plan \Chanhassen Part 2 WHPP Amendment.docx vii • Privately -owned wells o Promoting proper management of existing active wells in the DWSMA. Again, this includes working with the neighboring jurisdictions into which the DWSMA extends to promote proper management of existing active wells in the DWSMA. o Encouraging the proper sealing of all unused wells within the DWSMA. This includes working with the neighboring jurisdictions into which the DWSMA extends to promote sealing of any unused wells within the DWSMA, • Potential contaminant source properties • Providing information to owners of properties that may contain Class V wells, • Provide information to owners of properties where storage tanks are located that will encourage proper operation and maintenance of the storage tanks, o Periodically obtain information on the status of wells and storage tanks from the regulating agencies to to maintain an up -to -date potential contaminant source database for the DWSMA and allow timely recognition of potential issues that could affect the Chanhassen municipal water supply or DWSMA. • Public education • Distribution of the Chanhassen Consumer Confidence Report for the water supply system, • Distribution of information on the proper operation and maintenance of private wells, • Post WHPP information on the City of Chanhassen website at http : / /www.ci.chanhassen.mn.us / • Inclusion of wellhead and source water protection into the City's planning process, • Working with the cities of Deephaven, Eden Prairie, Excelsior, Greenwood, Minnetonka, Orono, Shorewood, and Tonka Bay to the extent practicable to identify appropriate public education opportunities for any residents within the portions of the DWSMA that extend into these jurisdictions, o Distribution of a Wellhead and Source Water Protection informational brochure. • Continued data collection • Recording static and pumping water levels in the Chanhassen municipal wells, • Collection of additional local geologic and hydrogeologic data as it becomes available or via undertaking hydrogeologic studies, • Collection of data on potential contaminant sources within the DWSMA. 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CWI Well Location Map ID (Map ID refers to Table C -2) O Feet 3,000 0 3,000 ISM 0111M Meters 500 0 500 B ARR Figure C -8b WELL LOCATIONS - EAST City of Chanhassen Chanhassen, Minnesota Land Use Types by Acres Fa r 0,03% _ 5easonal"aolion 3 0.1% c o f , ti a m o o o Open Water 17.9•% U N O Single Family Detached °i Undeveloped 418% LL 10.4% 0 ° o r 0 Airport. 0.7% Major Highway 2.21% EI, N M 4 Golf Course �l N o Single Family o -> - Attached F` 3.2% Multifamily 4 Institutitional 0 Retail and Other 2.80% Extractive d 0.0015, Mixed Use Commercial 1.9% o Industrial and Utility ixed Use Industrial Mixed Use Office Commercial u_ 2.65 0.01% Residential 0.03% 0.29 0.02% , Agricultural - Mixed Use Commercial and Other Farmstead Industrial and Utility Seasonal/Vacation Institutional Single Family Detached ® Park, Recreational or Preserve Cum Single Family Attached - Golf Course Holiday Lake i� Manufactured Housing Park Railway William i Lake , Rose PT Minnetonka Lake Office Undeveloped Mixed Use Residential Water Minnetonka Lake V, - Mixed Use Industrial Extractive H ooper 'Lake tot Chanhassen Municipal Well HENN.EPIN Birch Island II COUNTY Lake (Map ID refers to Table C -2) 11 - Municipal Well Location Map ID Duck Lake I!� i I 1 (Map ID refers to Table C -2) AF Lake ilk „ �j ® Chanhassen DWSMA Como take ___ Municipal Boundary County Boundary % Mary Lake a - Galpin Christmas Lake i t Lake Mitchell •L-ake Silver I Land Use Data (Met Council 2010 Generalized Land Use) Lake I Land Use Types by Acres Fa r 0,03% _ 5easonal"aolion 3 0.1% c o f , ti a m o o o Open Water 17.9•% U N O Single Family Detached °i Undeveloped 418% LL 10.4% 0 ° o r 0 Airport. 0.7% Major Highway 2.21% EI, N M 4 Golf Course �l N o Single Family o -> - Attached F` 3.2% Multifamily 4 Institutitional 0 Retail and Other 2.80% Extractive d 0.0015, Mixed Use Commercial 1.9% o Industrial and Utility ixed Use Industrial Mixed Use Office Commercial u_ 2.65 0.01% Residential 0.03% 0.29 0.02% , Agricultural - Mixed Use Commercial and Other Farmstead Industrial and Utility Seasonal/Vacation Institutional Single Family Detached ® Park, Recreational or Preserve Single Family Attached - Golf Course Holiday Lake Multifamily Major Highway Manufactured Housing Park Railway 1 Retail and Other Commercial _ Airport Rose Lake Office Undeveloped Mixed Use Residential Water - - Mixed Use Industrial Extractive tot Chanhassen Municipal Well HENN.EPIN Birch Island (F 75 - Municipal Well Location Map ID COUNTY Lake (Map ID refers to Table C -2) - Municipal Well Location Map ID Duck Lake I!� i I 1 (Map ID refers to Table C -2) AF Lake ® Chanhassen DWSMA Round Lak ___ Municipal Boundary County Boundary % i Emergency Response Area Mitchell •L-ake , Land Use Data (Met Council 2010 Generalized Land Use) School Lake N 5 , , Land Use Types by Acres Fa r 0,03% _ 5easonal"aolion 3 0.1% c o f , ti a m o o o Open Water 17.9•% U N O Single Family Detached °i Undeveloped 418% LL 10.4% 0 ° o r 0 Airport. 0.7% Major Highway 2.21% EI, N M 4 Golf Course �l N o Single Family o -> - Attached F` 3.2% Multifamily 4 Institutitional 0 Retail and Other 2.80% Extractive d 0.0015, Mixed Use Commercial 1.9% o Industrial and Utility ixed Use Industrial Mixed Use Office Commercial u_ 2.65 0.01% Residential 0.03% 0.29 0.02% , Agricultural - Mixed Use Commercial and Other Farmstead Industrial and Utility Seasonal/Vacation Institutional Single Family Detached ® Park, Recreational or Preserve Single Family Attached - Golf Course Holiday Lake Multifamily Major Highway Manufactured Housing Park Railway 1 Retail and Other Commercial _ Airport Rose Lake Office Undeveloped Mixed Use Residential Water - - Mixed Use Industrial Extractive Chanhassen Municipal Well HENN.EPIN Birch Island (F 75 - Municipal Well Location Map ID COUNTY Lake (Map ID refers to Table C -2) Other Municipal Well Municipal Well Location Map ID Duck Lake (Map ID refers to Table C -2) AF Lake ® Chanhassen DWSMA Round Lak ___ Municipal Boundary County Boundary % Emergency Response Area Mitchell •L-ake , Land Use Data (Met Council 2010 Generalized Land Use) School Lake N Where can I find out more about Chanhassen's drinking water? The Sewer and Water Utilities department posts information about water quality and water usage on its section of the City of Chanhassen's website (www.ci.chanhassen.mn.us). There's also informa- tion there about the city's WaterWise program, designed to assist residents and businesses with water conservation strategies through incentives and education. Other resources The Minnesota Department of Health publishes The Well Owner's Handbook, a guide to well main- tenance and operation. It's available on the MDH website, along with a wealth of other informa- tion (www.health.state.mn.us) — search using the terms "wellhead protection" or "drinking water protection.' For more information about Chanhassen's wellhead and source -water protection pro- gram, please contact Kevin Crooks, Wellhead Protection Manager at 952 - 227 -1311 or kcrooks@ ci.chanhassen.mn.us. City of Chanhassen water sources safeguarding our municipal drinking water wells and What Chanhassen is doing to protect public drinking water Working with the Minnesota Department of Health, Chanhassen has developed a wellhead protection plan for the 10 municipal wells that supply public drinking water. Nine of these wells pump groundwater from the Prairie du Chien aquifer and one from a non - bedrock aquifer. What is a wellhead protection plan (WHPP)? A wellhead protection plan is one way to prevent pollution or contamination of public water - supply wells and source water. It helps keep drinking water clean and helps Chanhassen avoid costly treatment and cleanup of contaminated groundwater and the need to drill new water - supply wells. To develop the WHPP, the City determined the parts of the aquifers from which public drinking water is drawn. The City and its engineers then defined drinking -water supply management areas (DWSMAs) to be protected by the plan. With this information, they were able to: • identify potential sources of contamination that might affect the DWSMAs • determine how to manage these potential contaminant sources, and • develop an alternative water - supply contin- gency plan in case Chanhassen's drinking water sources are ever contaminated. r e � � � � e � r � e � ag .: ~•�� Chanhassen ' Legend ® Municipal Well :iMunicipal Boundary •'' =DWSMA ' ••,• •• Now the city engineers can use the WHPP to manage and monitor potential sources of contami- nation within the DWSMAs and keep public drinking water safe. Does Chanhassen need a WHPP? Chanhassen is required to protect its wellhead areas and source water by state and federal laws. Even if it wasn't, City engineers can use the WHPP to un- derstand and protect the public water supply —now and in the future. glossary aquifer: a water - bearing layer of permeable rock, sand, or gravel WHPP: wellhead protection plan source water: groundwater pumped by city wells DWSMA: drinking -water supply management area recharge areas: areas such as ponds and wet- lands that contribute groundwater to the aquifers This map shows the Chanhassen city boundary and the locations of the city's municipal drinking - water wells. The drinking - water supply management area (DWSMA) protected by the city's wellhead pro- tection plan is also shown. How will the WHPP affect me? Groundwater can be contaminated by something as simple as spilling chemicals on the ground, where they can be carried by rain or snowmelt into wetlands or other aquifer recharge areas. If you're a resident or business owner in the DWSMA, you can help protect the water supply by: • disposing of used motor oil and household chemicals properly —not dumping them on the ground • cleaning up oil or household chemicals spilled on the ground using absorbent materials and disposing of them properly • minimizing chemical wastes in your home or business to reduce the risk of spills. Private wells may provide a pathway for con- taminants to reach the aquifers. If you are a well owner, be sure your well is properly constructed and maintained. If there are unused, damaged, or abandoned wells on your property, be sure these are sealed. Chanhassen Wellhead and Source Water 15T Protection Program What Chanhassen is doing to protect public drinking water Working with the Minnesota Department of Health, Chanhassen has developed a wellhead protection plan for the 10 mu- nicipal wells that supply public drinking water. Nine of these wells pump ground- water from the Prairie du Chien aquifer and one from a non - bedrock aquifer. What is a wellhead protection plan? A wellhead protection plan (WHPP) is one way to prevent pollution or contami- nation of public water - supply wells and source water. It helps keep drinking water clean and helps Chanhassen avoid costly treatment and cleanup of contaminated groundwater and the need to drill new water - supply wells. To develop the WHPP, the City deter- mined the parts of the aquifers from which public drinking water is drawn. The City and its engineers then defined drinking -water supply management areas (DWSMAs) to be protected by the plan. With this information, they were able to: • identify potential sources of contamina- tion that might affect the DWSMAs • determine how to manage these poten- tial contaminant sources, and • develop an alternative water - supply contingency plan in case Chanhas- sen's drinking water sources are ever contaminated. glossary aquifer: a water - bearing layer of perme- able rock, sand, or gravel WHPP: wellhead protection plan source water: groundwater pumped by city wells DWSMA: drinking -water supply manage- ment area recharge areas: areas such as ponds and wetlands that contribute groundwater to the aquifers Now the city engineers can use the WHPP to manage and monitor poten- tial sources of contamination within the DWSMAs and keep public drinking water safe. Does Chanhassen need a WHPP? Chanhassen is required to protect its wellhead areas and source water by state and federal laws. Even if it wasn't, City engineers can use the WHPP to under- stand and protect the public water supply —now and in the future. How will the WHPP affect me? Groundwater can be contaminated by something as simple as spilling chemi- cals on the ground, where they can be carried by rain or snowmelt into wet- lands or other aquifer recharge areas. If you're a resident or business owner in the DWSMA, you can help protect the water supply by: • disposing of used motor oil and household chemicals properly —not dumping them on the ground • cleaning up oil or household chemi- cals spilled on the ground using absorbent materials and disposing of them properly • minimizing chemical wastes in your your home or business to reduce the risk of spills. Private wells may provide a pathway for contaminants to reach the aquifers. If you are a well owner, be sure your well is properly constructed and maintained. If there are unused, damaged, or aban- doned wells on your property, be sure these are sealed. Where can I find out more about Chanhassen's drinking water? The Sewer and Water Utilities depart- ment posts information about water quality and water usage on its section of the City of Chanhassen's website (www. ci.chanhassen.mn.us). There's also infor- mation there about the city's WaterWise program, designed to assist residents and businesses with water conservation strate- gies through incentives and education. Other resources The Minnesota Department of Health publishes The Well Owner's Handbook, a guide to well maintenance and operation. It's available on the MDH website, along with a wealth of other information (www. health.state.mn.us) — search using the terms "wellhead protection" or "drinking water protection.' For more information, please con- tact Kevin Crooks, Wellhead Protection Manager at 952- 227 -1311 or kcrooks@ ci.chanhassen.mn.us. .- - - -- Chanhassen ' f L / Legend ® Municipal Well ♦� ; :/Municipal Boundary •'� ENDWSMA ' ���• �� This map shows the Chanhassen city boundary and the locations of the city's municipal drinking -water wells. The drinking -water supply management area (DWSMA) protected by the city's wellhead protection plan is also shown.