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4 Wellhead Protection PW379 CITY OF CHANBASSEN 7100 MarlÅ“t Boulevard PO Box 147 Chanhassen, MN 55317 Administration Phone: 952.227.1100 Fax: 952227.1110 Building Inspeçllans Phone: 952.227.1180 Fax: 952.227.1190 Engineering PhOfle 952.227.1160 Fax: 952.227.1170 Flnançe Phone: 952.227.1140 Fax: 952.227.1110 Park & Reç,eaUan Phone: 952.227.1120 Fax: 952.227.1110 Recreation Center 2310CoullerBoulevard PhOfle: 952.227.1400 Fax: 952.227.1404 Planning & Halural Resau",es Phone: 952.227.1130 Fax: 952.227.1110 PubllçWorks 1591 Park Road Phone: 952.227.1300 Fax: 952.227.1310 Senla,Cenler Phone: 952.227.1125 Fax: 952.227.1110 WebSI!e W'Iffl.ci.chanhas$en.mn.us .1. MEMORANDUM TO: Teresa Burgess, Public Works Director/City Engineer Matt Saam, Assistant City Engineer fJ.tr April 2, 2002 Public Hearing and Adoption of Wellhead Protection Plan "'~ PW379 VW. FROM: DATE: SUBJ: REOUEST Staff is recommending that the City Council hold the public hearing and adopt the Wellhead Protection Plan as prepared by SEH, Inc. BACKGROUND The City is required by State Statute to prepare and submit a Wellhead Protection Plan for all wells in the public water supply system. The deadline for completing the Wellhead Protection Plan is November 2003. DISCUSSION The goal of the Wellhead Protection Program is to prevent human-caused contaminants ITom entering public water supplies. The Wellhead Protection Plan helps the City identifY potential contaminant sources and goals to prevent a contamination. It also includes a previously adopted Emergency Plan in the case of a contamination. The only public comments staff has received during the comment period are the attached letters from the Met Council and the Mirmehaha Creek Watershed District, respectfully. While neither agency raised any big issues with the plan, SEH has incorporated their comments into the report. An executive summary of the plan has been attached for review. A full copy of the plan is on file in the Engineering Department and is also available via the City's website. RECOMMENDATION Staff recommends the following motion: "The Chanhassen City Council adopt the Wellhead Protection Plan as prepared by SEH, Inc., subject to the following conditions: I. Any revisions/comments deemed necessary after final review by the Minnesota Department of Health shall be incorporated into the Plan." Attachments: I. Letter ITom Met Council. 2. Memo ITom Mirmehaha Creek Watershed District. 3. Executive Summary ofWel1head Protection Br:~ICIAL Ei';;:::;·.JE::8ING Cc.;~"I c: Craig Kurtz, SEH Received ____ g:\eng\we1lhead protection plan\slaffreport 4-8-02.doc ReYis!on ti~. _, P.pprov..:í.: ~':: (~;t)r ~:í~g¡r!eer D¿'~9 _~_._ '-I-/"t/b'Z. Tbe City 01 Cbanhassen . A growing community with clean lakes, quality schools, a charming downtown, thrivina businesses. windino trails. and bP.:mliful n{~~i{~~~f·~îir.þ.~ 1t;ì;~rPQ~iI ,_._i PW :) /1 ~ Metropolitan Council Building communities that work Environmental Service January 18, 2002 Matt Saam Project Engineer City of Chanhassen 690 City Center Drive PO Box 147 Chanhassen, MN 55317 City OF ¡¡¡¡1!~~~"b~SSEN ,JAN 1 8 2002 IENGINêeH¡r".. .. . .. ~ '··:::....l. Re: City of Chanhassen, Wellhead Protection Plan Metropolitan Council District 4 Dear Mr. Saam: The Part II Wellhead Protection (WHP) Plan for the City of Chanhassen was received on December 4, 2001. Metropolitan Council (Council) staff, reviewed this plan along with Part I, which was submitted on July 12, 200 I, as amendments to the public facilities section ofthe local comprehensive plan, under the provisions of Minnesota Statutes, §473.859, Subd. 3 (4) (vii). The plans contained a thorough assessment of Chanhassen 's water supply source and offer detailed measures to protect it. The following are a few brief comments. Part II, Table I depicts wells identified in the drinking water supply management areas (DWSMAs). The aquifer for several of them is listed as unknown. While that information may not have been available ITom the County Well Index, an examination of the depth of the well and topographic and geologic maps should provide the aquifer information. This may help to prioritize wells which could be a potential contaminant source. In section 2.2 of Part II, the plan states that the city has pumped approximately 50 million gallons more each year. It is unclear whether or not this is more than the expected increase of 2, 7 percent per year. This should be clarified in future plan revisions. Also in this section, it is stated that the City has implemented an odd-even sprinkling ban to reduce demand. Although, this may help to reduce the peak demands, it does not necessarily reduce overall demand as it may incite watering when not needed. The plans found that due to the physical setting, the wells and DWSMAs are not vulnerable to contamination ITom activities at the land surface. While this allows the City to focus on potential pathways which penetrate the overlying protective units (i.e. wells), the City should remain cognizant of activities at the land surface in the DWSMAs as contaminants could find existing or undiscovered pathways to the units which supply water to the wells. The City of Chanhassen should be commended for its thorough assessment and planning for the protection of its water supply source. Several good wellhead protection goals and corresponding plans of action are outlined in the WHP plan. www.metrocouncil.org Metro Info Une 602-188 230 East Flf'th Street . St.Paul.Mlnnesota55101-1626 . 165J1602-J005 . Fax602-1138 . TIY29J-0904 This letter completes the review process of the Metropolitan Council. On behalf of the Metropolitan Council, I thank you for your effort in preparing this plan. Should any questions arise on the Council's review comments or on the process it followed, please feel rree to contact Chris Elvrum of the Council's Environmental Services Division at (651) 602-1066. Sincerely, (~ Keith Buttleman Director, MCES Environmental Planning and Evaluation Dept. c: Julius Smith, Metropolitan Council District 4 Terry Bovee, Minnesota Department of Health Allen Sundennan, SEH Tom Caswell, Metropolitan Council Sector Representative - ...,. n¡,;:pl\...r\ ,",o~u\..t. 763 479 4242; 02/08/02 8:44; #565; Page 2/2 MEMORANDUM ,,·~Wenck To: Glenda Spiona, MÎlUlehaha Creek Watershed District From: Lisa Tilman Date: January 24, 2002 Subject: Review of the City of Chanhassen Part II Wellhead Protection Plan Wenck file #01 85-04-267q INTRODUCTION On behalf of the Minnehaha Creek Watershed District, Wenck Associates has completed our review of the City ofChanhassen Part II Wellhead Protection Plan. The Part II Plan was received by the District on December 3, 2001. The District has 60 days to COmment on the Plan. The Pan 1 Wellhead Protection Plan was approved in July 2001 by the Minnesota Department of Health. Part I included the Drinking Water Supply Management Area (DWSMA) Delineations and vulnerability assessments. The Part II Plan is intended to provide an analysis of the effect of the physical environment and land use on the public water supply wells, identify problems and opportunities, and establish goals and a plan of action. SUMMARY 111e Prairie du Chien-Jordan and Franconia-Ironton-Galesville aquifers and the buried artesian drift aquifer are confined in the Chanhassen area are not likely to be impacted by changes in the physical environment or land use. Only the misuse of private wells has the potential to negatively impact the City water supply. The City has completed a review of wells within the DWSMAs. The review included wells listed in the County Well Index and those present on historical aerial photos. The Plan includes a number of goals aimed at limiting the risk that private wells present. The Plan establishes an education and cost-sharing program to inform and assist well owners in proper well use, protection, and abandonment. All new properties within the City will be required to use City water, and properties with existing wells will have to connect to City water when their wells fail. The City wi II continue monitoring their wells for water level and water quality. RECOMMENDATIONS The Wellhead Protection Plan appears adequate to provide the necessary protection of the aquifers in the Chanhassen area. . . -.,,--- , I , _J ~ i j ~ I -, .. -' .. .. Executive Summary The City of Chanhassen is completing its wellhead and source water protection plan for its eight existing municipal wells. This report is Part II of the Plan and it includes the following: . A review of the data elements. . The results of the potential contaminant source inventory. · A review of changes, issues, problems, and opportunities related to the public water supply and the identified potential contaminant sources. · A detailed discussion of the potential contaminant source management strategies and corresponding goals, objectives, and action plans. .J . A review of the wellhead/source water protection evaluation program and alternative water supply contingency strategy. .. Part I of the Plan was completed in May 2001. In Part I of the Plan, the Wellhead Protection Areas (WHPAs) and Drinking Water Supply Management Areas (DWSMAs) were delineated, and · vulnerability assessments of the wells and corresponding DWSMAs were completed. The municipal wells and source water aquifers within the DWSMAs were determined to be nonvulnerable to surficial contamination due to the overlying geologic confming units and construction of the wells. · · : J · J ¡ The information and data contained in Chapters 1-4 of this Plan provide support and a basis for the approaches taken in addressing and managing the identified potential contaminant sources. The Chanhassen wellhead and source water protection program is concentrating its efforts on other wells within the city and specifically within the DWSMAs. In addition, the program includes providing educational opportunities for Chanhassen residents regarding wellhead and source water protection, and gathering new or updated information for future revisions to the Plan. Wellhead and Sou,ee Wate, Protection City of Chanhassen, Minnesota A-CHANH0101.00