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HomeMy WebLinkAbout03.22.06 Work Session Packet City of Farmington 325 Oak Street Farmington, MN 55024 Mission Statement Through teamwork and cooperation, the City of Farmington provides quality services that preserve our proud past and foster a promisingfuture. AGENDA CITY COUNCIL/PLANNING COMMISSION WORKSHOP March 22, 2006 5:00 P.M. FARMINGTON MAINTENANCE FACILITY 1. CALL TO ORDER 2. APPROVE AGENDA 3. INTRODUCTION 4. SEWER SYSTEM DISCUSSION 5. WATER SYSTEM DISCUSSION 6. SURFACE WATER DISCUSSION 7. ADJOURN PUBliC INFORMATION STATEMENT Council workshops are conducted as an infonnal work session, all discussions shall be considered fact-finding, hypothetical and unofficial critical thinking exercises, which do not reflect an official public position. . Council work session outcomes should not be construed by the attending public and/or reporting media as the articulation of a formal City policy position. 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"'"" ':'5 :..... ~~ ~ .- ". 0:11 ;'1",0" -= w,:.::.... ..... :, ~ ~v /:.~ ~m!ml z ;q., \,~~;2L . ~ -J 0:--. ('\Jj ~~m ~~ ~ ';"::fffi:: ~ rt 1e~ ~:h::.::::. DI!Hi:~m ~ ~,i~.~:.:.. .~;; ~ I ~~ l!i~~mw < i.;.....:, ,~>~ ~ Ii ::111 ~~II: oomOOffi i~~ & ~ I - i/., ',P c'~ ~ iM [h r;~ ~ l~~ ffi f i ~ . 1 ~~~' "rcU l';h--:;~ ~~ ~81!fi ~ " ~~~ DD[illO~ ~ijr I:L I ~ "" ' ~~, '" ~ '" ~ OJ 1l 'iii ~ 0- " ;:; rn ~ ~ /7-3 .11. Bonestroo e Rosene 'Ii1I Anderlik & 1\1 1 Associates Engineers & Architects eMemo Project Name: 2006 Comprehensive Sewer Policy Plan - SE Area Analysis Client: City of Farmington File No: 141-05-254-2 To: Mayor, City Council and Planning Commission Date: 3.20.06 From: Earth Evans Re: Summary of Issues This memo highlights the issues relating serving areas adjacent to the southeast area of Farmington with Sanitary Sewer Service. Attached is the Draft Trunk Sanitary Sewer Figure 11 that shows the southeast areas in question. Existinf! Downtown Line . The downtown line is shown on Figure 11 from node 604.4 to node 610. . The downtown line has capacity for an additional 0.182 MGD which correlates to roughly 675 single family units or 775 units at a 50/50 combination oflow density residential at 3 units per acre and medium density residential at 7 units per acre (5 units per acre composite). . The addition of a 30 acre elementary school site on the Angus property would reduce the number of residential units that could be built by approximately 20-30 units. niscavne Line The Biscayne line would service the southeast districts shown on the map including: D6-10, 11, 12.1, 12.2, 13.1, 13.2. . The Biscayne Line is shown from node 604.2 to 619. It is designed to serve the southeast area, totaling roughly 950 acres. . The land use density used in this analysis for the southeast area is 50% low density residential at 3 units per acre and 50% medium density residential at 7 units per acre (5 units per acre composite). . Two options were analyzed for connecting the Biscayne Trunk to the MCES Interceptor at node 619. 1. Lift StationIForcemain (as shown on Figure 11). Cost estimated at $3,026,000* with a corresponding trunk area charge of approximately $3, 190/acre. 2. Gravity Line (not currently shown on Figure 11). Cost estimated at $2,346,000* with a corresponding area charge of approximately $2,470/acre. Eureka Line . Sanitary sewer service to the Eureka Township area (D4-14, 15, 16, 17) is provided in line shown from node 409.1 to 409. Cost estimated at $1,210,000* with a corresponding trunk area charge of approximately $2,300/acre. *Note that the estimated construction costs do not include land acquisition or dewatering. Bonestroo, Rosene, Anderlik and Associates, Inc. www.bonestroo.com o St. Paul Office: 2335 West Highway 36 SI. Paul, MN 55113 Phone: 651-636-4600 Fax: 651-636-1311 o Milwaukee Office: 1516 West Mequon Road Mequon, WI 53092 Phone: 262-241-4466 Fax: 262-241-4901 o Rochester Office: 112 7'h Street NE Rochester, MN 55906 Phone: 507-282-2100 Fax: 507-282-3100 o Wlllmar Office: 205 5th Street SW Willmar, MN 56201 Phone: 320-214-9557 Fax: 320-214-9458 o St. Cloud Office: 3721 23rd Street S SI. Cloud, MN 56301 Phone: 320-251-4553 Fax: 320-251-6252 o Grayslake Office: 888 East Belvidere Road Grayslake. IL 60030 Phone: 847-548-6774 Fax: 847-548-6979 .11. Bonestroo e Rosene ~ Anderlik & 1\J 1 Associates Engineers & Architects JAemo Project Name: SE Expansion - Water System Client: City of Farmington To: Honorable Mayor, City Council, Planning Commission File No: 141-05254-3 Date: 03/22/06 From: Mark Rolfs Re: Water System Adequacy Remarks: Honorable Mayor and City Council: Attached to this memo is Figure K-1 which is a graphic representation of the hydraulic analysis that was performed to evaluate the City of Farmington's ability to provide water service to an area outside of the Study Area that was used in the 1997 Water Supply and Distribution Plan. There are three main points to this analysis. . The bold red outline in Figure K-1 represents the Study Area investigated in this analysis. The area in the SE corner of the City between the green line and the red line is the area added by this analysis. The green hatched area near Empire is the area that was deleted for this analysis. The demand rates for all remaining areas of the 1997 Study Area Report were assumed to remain unchanged and constitute an ultimate maximum day demand of 23.3 million gallons per day (MGD). . The Land Use Density for the area added is as follows: 50% of the developable area is assumed to develop at a Single Family Density rate of 3 units per acre. The remaining 50% of the developable land is assumed to develop at a Medium Density rate of 7 units per acre. These densities result in a projected maximum day demand addition of 2.86 million gallons per day (MGD) for the SE area. The Empire area that was eliminated from the Study Area constitutes a maximum day demand reduction of 1.38 MGD. The combination of these two areas results in a net demand increase to the System of 1.48 MGD. . The computer model results indicate that the City can provide service to the SE area by adding 1 additional well and 0.5 million gallons (MG) of storage and several size increases to the trunk water mains. These additional trunk facilities would be paid for by the trunk fees for the additional development in the SE area of Farmington. End of Memo Bonestroo, Rosene, Anderlik and Associates, Inc. www.bonestroo.com o St. Paul Office: 2335 West Highway 36 SI. Paul, MN 55113 Phone: 651-636-4600 Fax: 651-636-1311 o Milwaukee Office: 1516 West Mequon Road Mequon, WI 53092 Phone: 262-241-4466 Fax: 262-241-4901 o Rochester Office: 112 7'h Street NE Rochester, MN 55906 Phone: 507-282-2100 Fax: 507-282-3100 o Will mar Office: 205 5th Street SW Will mar, MN 56201 Phone: 320-214-9557 Fax: 320-214-9458 o St. Cloud Office: 3721 23'd Street S SI. Cloud, MN 56301 Phone: 320-251-4553 Fax: 320-251-6252 o Grayslake Office: 888 East Belvidere Road Grayslake, IL 60030 Phone: 847-548-6774 Fax: 847-548-6979 Memo .11. Bonestroo .. Rosene ~ Anderlik & 1\11 Associates Engineers & Architects Project Name: SWMP Addendum Southeast Area Client: City of Farmington File No: 141-05254-1 To: Mayor, City Council, Planning Commission Date: March 22, 2006 From: Erik Peters Re: Summary overview of draft report General Purpose: The report is an addendum to the 1997 Surface Water Management Plan (SWMP). The purpose of the addendum is to analyze an area south and east oftown not covered by the 1997 Plan. The SWMP is a planning tool that provides a conceptual layout of a drainage network for planning and resource management purposes. By developing a SWMP the City is able to anticipate and fund drainage improvements and resource conservation efforts. Site Characteristics: The study area drains to the Vermillion River and a tributary called the South Branch of the Vermillion. A portion of the study area drains to the City's Prairie Waterway. The study area is distinguished by the following features: 1. Most of the study area is very flat. 2. Wetlands of various types and quality are scattered throughout the area. 3. High groundwater table (relatively near to the surface). 4. Soils are characterized by silty topsoil over sands. Areas in Farmington with similar features include recent developments of Autumn Glen, Parkview Ponds, Mystic Meadows, Prairie Creek and Riverbend & Garvey's IndustriaVBusiness Park. Vermillion River Watershed Issues: The Vermillion River is classified as a trout (cold water fishery) stream downstream to Hwy 52 crossing. Due to its status as a trout stream, runoff management within the watershed is of special interest to many parties besides the City (regulatory agencies, special interest groups, etc.). Due to the River's classification, runoff temperature and/or volume regulation in addition to runoff rates and nutrient reduction are management issues. The County's Vermillion River Watershed Joint Powers Organization (VRWJPO) is currently working on developing runoff management standards in the watershed. The sole outside (non-city) permitting agency at this time regarding drainage is the Minnesota Pollution Control Agency's NPDES construction permit. How the VRWJPO standards will compare to the NPDES permit is still unknown. Issues for significant debate regarding the standard development include the following: 1. How will watersheds draining to warm water tributaries of the Vermillion River (such as the South Branch, Middle Creek and North Creek) be managed, particularly if they drain into the stretch of the Vermillion River designated as a cold water fishery? 2. Will there be a uniform standard regarding temperature and volume control throughout the watershed or will areas of the watershed be broken out to be managed differently. An example of different management schemes is current concept standards regarding rate control that are based on watershed location. Bonestroo, Rosene, Anderlik and Associates, Inc. 2335 West Highway 36 + 81. Paul, MN 55113 + Phone: 651-636-4600 + Fax: 651-636-1311 Page 1 0'2 .11. Bonestroo ~ Rosene -=- Anderlik & 1\11 Associates Engineers & Architects Surface Water Management Approach: The development of a management approach was based on responding to varying site conditions within the study area. Based on this background work, a management plan was developed with city staff that addresses rate control, water quality protection and their interconnection. A brief summary of the management approach is provided below. Memo South Branch: Within the area tributary to the South Branch, typical ponds are foreseen to become the dominant best management practice. Rate control criteria to restrict rates below existing conditions (particularly for frequent storm events) were established. Water quality protection focused on nutrient reduction through wet detention ponds and temperature mitigation by routing discharged runoff through swales and floodplain wetlands. Vermillion River: South ofHwy 50 local water quality criteria water quality protection focuses on a treatment train concept of pretreatment ponds draining to infiltration basins incorporated within or adjacent to a regional ponding basin. North ofHwy 50 large groundwater ponds with significant runoff detention storage and lateral side slope infiltration capacity will likely become the dominant BMP. Local pretreatment ponds adjacent to the groundwater ponds will protect the water quality within these large basins. These groundwater ponds will be similar to recent developments in Farmington with similar site characteristics (e.g. Mystic Meadows Development). The construction of another waterway similar to the existing Prairie Waterway was considered but not selected as a management approach for two primary reasons: 1. There would be numerous wetlands requiring excavation with potential mitigation of undesired impacts, affecting the cost and timing for implementation of such an approach. 2. Upstream development of the waterway would be constrained by construction of the waterway from the downstream end, limiting flexibility in implementing the Plan. Conclusion: This addendum to the City's SWMP will help provide for a planning document for drainage management in an area where the City has received inquiries for development purposes. This draft management plan exceeds existing agency requirements on rate control, nutrient reduction, temperature and volume control. The plan will also exceed current conceptual, draft, standards under development by the VRWJPO with the exception of volume control in the area draining to the South Branch. Once the VRWJPO's standards are established, the City's plans will need to conform to their requirements. Any differences would be formally resolved when the City's SWMP is updated 2007/2008 as part of the overall comprehensive plan amendment process required by the Met Council. Bonestroo, Rosene, Anderlik and Associates, Inc. 2335 West Highway 36 + St. Paul, MN 55113 + Phone: 651-636-4600 + Fax: 651-636-1311 Page 2 of 2