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HomeMy WebLinkAbout2007-11-07 ENR Packet AGENDA CITY OF MAPLEWOOD ENVIRONMENTAL AND NATURAL RESOURCE COMMISSION Wednesday, November 7, 2007 ~;99pi!'ij. Council Chambers - Maplewood City Hall 1830 County Road BEast 1. Call to Order 2. Roll Call 3. Approval of Agenda 4. Approval of Minutes September 4, 2007 October 2, 2007 5. Visitor Presentations: 6. Commission Presentations: 7. Staff Presentations: . Non-degradation report - written and Power Point - 30 min. 8. Unfinished Business: . Wetland Ordinance - follow-up 9. New Business: . Nature Center update (see Parks) -10 minutes . Parks chart 10. Old Business: . Conservation Easements 11. Adjourn MINUTES OF THE ENVIRONMENTAL AND NATURAL RESOURCES COMMISSION September 4, 2007 Members Present Jim Beardsley, Chair Carole Lynne Frederica Musgrave Ginny Yingling Members Absent Margaret Behrens Carol Mason-Sherrill Staff Present Du Wayne Konewko Shann Finwall Ann Hutchinson Ginny Gaynor Welcome/Introductions/housekeeping items/Handouts-Requests Agenda approved Approved Minutes from the August 21, 2007 meeting Comments from Staff: . Ann Hutchinson discussed the importance of removing Buckthorn in the City of Maplewood and announced a Buckthorn removal event in Maplewood neighborhoods and city parks. Ann also mentioned The Global Warming Seminar that is coming up in October referred anyone interested to call the nature center at 249-2170 regarding this free event. . Ginny Gaynor mentioned the Priory Reserve bowhunt. . Tom Moibi will be resigning from the Environmental Natural Resources Commission and if interested Maplewood residents may apply. Unfmished business: The Wetlands Ordinance will be discussed later in the evening in Conference Room A. New Business . Fall Cleanup is scheduled for October 20 from 8:00 a.m. to 12 Noon at Gethsemane Church. More information to follow at the October meeting. . Frederica Musgrave proposed that the Commission come up with an environmental and natural resources plan. Staff will prepare a report and set up a meeting to discuss this proposal in October or November. 1 Wetland Ordinance 1. Decisions were made on the following items: A. Streams . Suggestion on wording on the Ordinance under Findings and Purpose, section C, subpart 5, subpart J. .. it was requested that streams be added to the sentence. . Streams shall be considered class A. B. Trails Changes to the language of the Ordinance include: . Item (h) should be first item. Trail plan design must be approved by staff. . (A) should now read... "The trail shall be of pervious materials. An elevated boardwalk shall not be considered an impervious surface. . (B) the words "where possible" were removed, making the sentence read... Buffers shall be expanded equal to width ofthe trail corridor. . ~ staff will replace the word "immediately" with different more effective language. . (E) a definition is needed for the wording "sustainable design" and the wording has been changed to read... "Trail must be constructed with sustainable design methods and materials". . (F) the following has been added: Boardwalks on public land shall be maximum of 12' wide. Boardwalks on private land shall be a maximum of 6'wide. . (G) Trails or boardwalks shall not be constructed entirely around the wetland. Clearer wording needs to be implemented. The following have been added to trail section: . (I) Re-vegetation plan shall be approved by staff. . (1) Trail shall not be permitted in areas with rare or endangered plants or animals. . (K) Trails shall be a minimum of25 feet from the wetland edge. Discussion of trails in buffer on public vs. private land: . Trails in the buffer shall be permitted on public land and semi-public land, in accordance with above. On private property trails shall not be allowed in the buffer. . A trail on semi-public land would occur when a trail on private land connects to a public street or access and the private landowner agrees to allow their trail to be open to the public, Or, it trail on semi-public land could be a trail put in by a developer primarily for use by people in a subdivision. 2 2. Discussion on averaging Staff commented that ifthe setbacks can be averaged and the buffer improved it is sometimes more beneficial and would allow the developer to develop the area without needing a variance. If averaging is not allowed then there may be an increase in variances requested. The commission stated that we need to build some provisions into the ordinance that state clearly when we would allow averaging and put some strict criteria including some demonstration of monetary or hardship. There needs to be something back to the city for example an increase to the buffer width somewhere else or a fee for penalty to mitigate a wetland somewhere else. Additional discussion of averaging ensued and will be continued at the next meeting. If averaging permitted for Classes A, B, C, the chart below shows minimums. Wetland Classes A+ A B C Utility Proposed Minimum 200' 100' 75' 50' 10' If we allow averaging No 75' 50' 50' No average what's the minimum? average Existing ordinance Class 1 Class 2 Class 3 Class 4 Class 5 average Average 100' 100' 50' 25' 0 Minimum 100' 50' 25' 20' 0 Members requested a copy ofthe Eden Prairie Ordinance. Staff will send the ordinance to Commissioners. 3. Discussion on Variances and exemptions The difference between an exemption and a variance was discussed which led into a discussion on the General Exemptions section in the ordinance. It was decided that this section needs to be reworded for clarification. Next meetin!!: Tuesday, October 2nd at 4:45p.m - 6:45p.m. in the council chambers. Meetin!! Ad iourned 3 Environmental and Natural Resources Commission Minutes Tuesday, October 2,2007 Call to Order: 4:50 Members Present: Carol Mason Sherrill Jim Beardsley Federica Musgrave Ginny Yingling Staff Present: Dewey Konewko Ginny Gaynor Ann Hutchinson Shann Finwall Members Absent: Margaret Behrens Carol Lynne Approval of Minutes: Tabled as Carol was not at the meeting. Unfinished Business: 1. South Maplewood Moratorium - Rose Lorsung, Schoell Madsen (See Sept. 24 memo from Rose) . Reviewed Natural Resources in study area. . Reviewed concepts for residential cluster development (RCD) properties near or adjacent to corridor, more stringent process or incentives to develop w/preservations in mind. . May want to look at wetland, tree and shore land ordinances to make sure are clear for developers in this area. . Moratorium ends soon, RS recommends extending moratorium to work on NR issues with commission and others if approved would have until mid-March to develop this. . Commissioners requested a tour of site. Tour will be planned in conjunction with Open Space, Parks, and Trail planning process. . Discussion on natural resources data available for area. 1. Area is mapped around the natural resources. 2. Development comes second to natural resources; we see what is on the ground first before development is considered. 3. Want protected areas where wildlife is and for migratory wildlife. 4. Corridor has water, wetlands, steep slopes and maple basswood foreest. 5. Discussion about providing a solution to animals crossing around the Interstate as the parcel is dissected by the Interstate. . Proposing to extend the Moratorium another 120 days. 2. Environmental Corridors Comments from Jennifer, who will be working on the Open Space, Parks and Trail Plan with Shoell Madsen. . Jennifer would like to get us out into the community - take a look at it and do walking tours. Take a look at Handicap Accessibility. . Need to formulate how we can integrate looking at these greenway corridors in conjunction with the trail component. To make sure we are not only looking at the trail component but also the multi-purpose greenway concept and what they can provide in terms oftrails, wildlife migration, open space protection and integratino with neighborhoods. . Will create a task force to work on open-space and trail component which will get started in the next month or two. Will need two or three members from the commission. Minimum 2 meetings walking - Saturday plus evening meetings. Frederica Musgrave, Ginny Yingling, Carol Mason Sherrill will be our reps. 3. Visitors: Ron Cockriel 943 Century Ave representing the Historic Preservation Commission. . Invited public to Saturday event at Farm 4. Wetland Ordinance . Averaging 1. Studied developments within the city since 2003 - 11 developments were constructed next to wetlands and of those developments 5 used the averaging that the current wetland ordinance provides,S mitigated wetlands and one met the setback requirement. 2. Question posed by staff- if we allow averaging do we restrict it to a certain percentage, require best management practices, and restrict it to specific wetland classes? 3. Summary of suggestions: . We might be interested in doing averaging on a certain percentage of a wetland. Would like staff to get back to the Commission and give insight as to what kind of BMP's could be required whether that be fees, green roof and so on. . Discussed whether we would only allow averaging on the class A and B since 50' is minimum buffer width to adequately filter pollutants. . We don't degrade what is already there so averaging would be attached to something that maintains the status ofthat wetland from a class A or a class B or improves it from a class B to a class A and if we can't do that then we do not average. . Look at encouraging language and incentives. . Discussed Green Building Ordinance in Austin, Texas. . Exemptions 1. The increased set-back requirements are affecting some current single family homes. There was a study at a Priory neighborhood where 80 parcels will be affected by the buffer. Should we consider exemptions to those single family homes? . Any existing structure that is affected by the new wetland set-back requirement if it encroaches on that or falls in the wetland buffer that would be considered grandfathered in and can remain until the structure is destroyed. . Commissioners agreed that it would be reasonable to allow resident to construct addition that would encroach no more into the buffer that currently. For example, if home is 25 feet from wetland, addition could be 25' from wetland. . Encourage or require BMP's ifthey build into the buffer! . Need to put something in the ordinance so the staff and council have some guidelines, to simplify it for the developer. 2. Is it fair to allow these exceptions on just single family homes and not commercial? 5. Items staff should follow-up on . Environmental Utility Fund - should there be a flag in the ordinance that refers to the EUF. People can get a credit on that ifthey are using BMP's. . Wetland Ordinance - staff will draft language on averaging, exemptions, and BMP's for commissioners to review. Commission Presentations: none Staff Presentations: 1. Ann Hutchinson . Buckthorn Removal Days... looking for energetic helpers to pull and cut Buckthorn at Flicek Park, call the Nature Center to register 249-2170. . Global Warming Seminar on October 10 at the Gladstone Firestation. . October Newsletter handed out. 2. Upcoming meetings . October 9, Gladstone Streetscape meeting, with Design Review Board, 6:00-8:00 p.m., Council Chambers . October 16, Planning commission Meeting, includes public hearing on South Maplewood and Gladstone Streetscape (repeat of October 9 meeting for Planning Commission, Parks Commission, Historical Commission), time TBD . Tuesday, October 30 - Wetland Ordinance . November 6 ENR Commission meeting - to be rescheduled due to election . Next meeting 5:00-7:00 p.m. November 7 New Business: none Adjourn 6:45 p.rn. ENVIRONMENTAL COMMISSION REPORT MAPLWEOOD NATURE CENTER October 31,2007 October Public Program Attendance: Special Events: 1. Saturday, Sept 22 Friends Annual Picnic and first formal board meeting..................18 The friends annual picnic was held where the new board met some of the members. A $3,500 donation was donated to the friends by member Maridee McEvoy toward the completion ofthe Energy Bike. We were very excited to receive this gift and hope to see a completed exhibit in the next 3-6 months. The new officers are: President: Barb Kroll Vice President: Mark Robertson Secretary: Janice Soeffner Treasurer: Mary Jean Becker The next board meeting is Saturday, November 3 from 9 to noon. Anyone can become a friend of Maplewood nature with a minimum donation of$15. We are looking for more friends and have a need for one or two additional board members. 2. Friday, Oct 5 3M Visiting Wizards Teachers Workshop ..................50 3. Saturday, October 6 Super Science Saturday..........................................150 Staff brought the nature center and open space display, watershed models and pond invertebrates, brochures, and fliers to this highly attended event. The numbers here only reflect the people we actually talked to - estimates for the total number attending were 4-500. 4. Saturday October 13 Flicek Park Buckthorn Removal...............................6 Two staff and six volunteers helped remove at least 2 truckloads of Buckthorn from Flicek Park. Craig Andresen was hired to chainsaw and herbicide large buckthorn trunks, and volunteers hauled the brush to the curb, and pulled a number of smaller buckthorn. A big THANK YOU to the four NHS students from North High School: Dana Peterson, Dennis Ea, Brandon Ng, Nick Lindberg. We also thank Mark Robertson (Vice President ofthe Friends of Maplewood Nature) and Mark Gernes (OTF). There are some large really grand oaks there behind the baseball field - one of which is half buried by creating the private(? )drive on the east side ofthe baseball field. Idea for Earth Day: Get the athletic leagues who use the field to do a big trash pick up in the spring - there is A LOT oftrash under the trees! Family programs: 1. Saturday, Sept, 29 Feed the Animals............................................ .....11 (4 adults, 7 kids) Tuesdays, Oct. 16 Nuts About Trees............................................... ...3 (Continued on the back) Adult Seminars: 1. Thursdays, starting Sept 6 2. Wednesday, October 10 Master Naturalist Class.................................19 Global Warming Seminar .............................16 Staff have been extremely busy preparing for and teaching the Thursday evening Master Naturalists program. This includes two Saturday field trips. We co-teach with Ramsey county and Mississippi River Recreation area staff. Master Naturalists are required to perform 40 hours of volunteer service in order to graduate. Several students are working on "capstone projects" that will benefit the nature center. Numerous preschool and kindergarten groups have been attending the nature center this September and October. Edgerton School brought their 6th grade for pond study - students at that school will be helping us with a planting project in the spring. SCC cable funds video project: We recently received the completed DVD's of our Watershed Watchers service learning program that we do in the spring. The video has been airing on the government cable channels this year. It shows us planting the large raingarden at Robinhood Park, stenciling the neighborhood storm drains, collecting fish and invertebrates at Tanners Lake, and Rick Walsh from the DNR teaching kids about fish. (Nature Center was working with students from Oakdale elementary many of whom live around Tanner's Lake). Nature Center coordinated the program, with help from the DNR and the Ramsey Washington Watershed District. For information on other events please read the Fall nature center newsletter. Loading Assessment an Nondegradation Re For Selected Municipal Storm Sewer Systems (Selected MS4s) City of Minnesota EH No. A-MAPLE0608.00 DRAFT - October 26, 2007 October 2007 EXECUTIVE SUMMARY The revised National Pollutant Discharge Elimination System (NPDES) Pemrit No. MNR040000 for Small Municipal Separate Stoml Sewer Systems (MS4s) defines the conditions for discharging stoml municipal sources in Minnesota. The prinlary requirement of the pemut, which has been in is to develop and inlplement a Stoml Water Pollution Prevention Progranl (SWPPP) that six nunimum control measures. A new provision in the reissued 2006 pemut requires municipalities to complete a nondegradation assessment and report. These 30 Selected MS4s. the to as Based on the findings of the assessment, Selected MS4s are required to infommtion to the Minnesota Pollution Control Agency (MPCA) Conmlissioner and.to deterp,une additional control measures, beyond those already identified in their SWPPP, ca1Jpe ~easonably taken to mininlize the impacts of new or expanded discharges. Maplewood is one of the ,30S:~lectedJM!S4s and, therefore, the City has completed a loading analysis and has prepared this r~porft9. conlply with the requirements ofthe pemut. The nondegradation assessment consists of detemliningthe ch<!llg~in loading of annual runoff volume, total suspended sediment (TSS), and total phosph9T\;f~ (TPJl,~tween 1988 and current conditions (2005) and between current conditions and cOl:!wtions (2020). A detailed analysis of 30 years precipitation data was completed to detemune the annual average precipitation and the Maplewood area. The annual runoff volume for a given area is a function of the and pervious areas as well as the runoff curve nunlber for each portion. On impervious portions of Maplewood contrlbute nearly 94 percent of the runoff volume. fraction for year 2005 for individual watersheds ranges from 4 percent to 85 average annual runoff depth for the 294 drainage areas evaluated varies from inches. The overall annual runoff volunle from 1988 to 2005 has increased roughly 10 In evaluate the effects of the City's infiltration/filtration standard for new development in the future, annual runoff volume estimates for the 2005 to 2020 tin,e period considered the effects of capturing a I-inch runoff volume for projected areas of future development and redevelopment. Based on this analysis, the estinmted annual runoff volunle will decrease between 2005 and 2020 by about three percent. The annual runoff volume in 2020 is still estinmted to be higher than levels in 1988. The overall increase in annual runoff Loading Assessment and Non-Degradation Report City of Maplewood, Minnesota A-MAPLE060B.OO Page ES-1 October 2007 volume relative to 1988 conditions is not considered significant when evaluating the potential effects on channel erosion and stream morpholoh'Y. The City is not aware of any significant channel erosion or channel stability issues that are directly attributable to an increased runoff volume. Results of the loading analysis for TSS and TP for the 1988 to 2005 time period on a City-wide basis show a decrease in the TSS loading of approxinlately 68 tons and an increase in the TP loading of 354 Variations are apparent in the more detailed data for each of the 294 individual drainage of the loading analysis results is provided in the following table. Summary of Loading Assessment 1988 3,440 30% 7,056 959 Assuming No Storm Water Treatment Assuming Storm Water Treatment by 2005 3,853 33% 7,755 Ponds Only - Based on Ponds Created between 1988 and 2005 Runoff volume, TSS, and TP loads are 2020 4,661 40% 6,121 assumed for the new impervious areas. Revised development and redevelopment standards considered. 1988 to 2005 Increase in Runoff Volume, relative changes +413 -10.0% +2.6% Reduction in TSS and an increase in TP loadin9 Decrease in Runoff Volume, TSS and 2005 to 2020 -3.2% -10.8% -5.8% TP levels. TP and TSS reductions relative changes below 1988 levels and volume below 2005 levels. Based on in land use, the overall increase in impervious surface between 2005 and 2020 is 796 acres. This increase represents an impervious percentage increase city- to 40 percent. Even with this increase in the impervious surface coverage projected by increase in annual fUnoffvolume will be substantially reduced due to implementation of stoml practices focusing on infiltration and filtration. Continued inlplementation ofthe City's wide water I-inch infiltration standard for new development and redevelopment projects between 2005 and 2020 will result in a net reduction in TSS loading of93 tons and a reduction in TP loading of an estinmted 374 pounds by the year 2020. Loading Assessment and Non-Degradation Report City of Maplewood, Minnesota A-MAPLE0608.00 Page ES-2 October 2007 Loading Changes 1988-2005-2020 9000 8000 C] 1988 Loads 7000 11IIII 2005 Loads ~ 6000 o 2020 Loads ...J 5000 Cl 0 4000 'ti . 0 3000 ...J 2000 1000 0 Runoff Volume TSS (Tons) 1P(Lbs) (acre-feet) Parameters Analyzed While the 1988 to 2005 loading assessment shows an increase in the runoff volume due to the expansion of impervious surfaces from 1988 to 2005, TSS loadings have decreased, and the TP loadings increased by about 3 percent relative to 1988 levels. This result relates chiefly to the fact that numerous stoml water treatment ponds accompanied the new development and re-development that occurred between 1988 and 2005. The results show that these ponds, infiltration systems and rain gardens, for exanlple, are working to remove significant anlounts of total suspended sediment and phosphorus from stoml water runoff. stann water of.development between 2005 and 2020 will continue to add annual runoffvolunle. Runoff infiltration is expected to play an nmnagement in Maplewood. The City has been inlplementing focus on infiltration or filtration for several years. These standards for both new development and redevelopment, with the redevelopment reduction in runoff volume caused by capturing runoff from impervious surfaces Looking into the future, the impervious surface and increasingly inlportant translate into projects that analysis and related work the City has done as part of it's overall water resources nmnagement City has concluded that the current standards are adequate to meet the intent of the non- degradation provisions of the MS4 pemlit. 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'" Z ...J en ffi w >= w <( 0- W 0 W 0.. ~ >- ~ :t: 0:: :;; en 0- w '" <( 0- en u :> en :;; U w s: TO: FROM: DATE: RE: Du Wayne Konewko Ginny Gaynor 10/11/07 Open Space Update - October 2007 1. Conservation Easements. On October 15, staff will do a presentation for council regarding Land Protection Tools that can be used in addition to Conservation Easements. 2. Gladstone Savanna. Soil testing began at Gladstone Savanna on October 8 and will take one to two weeks. 3. Priory Deer Hunt. Two deer were taken the first weekend ofthe hunt. Hunters reported that a couple small groups ignored the "Preserve Closed" signs and were asked to leave. Remaining hunting dates: October 12-14, Ocboer 26-28, November 16-18. 4. Priory Trail. The trail contractor has finished most of his work for the year. We're delaying bench installation until 2008. The contractors would like to install one more boardwalk at the site this fall and has given us a bid of $4176 ($58/ft x 72 ft). The trail stops about 75' from Larpenteur. Staff will make this connection to Larpenteur when they do the work on the entry and parking (date not yet determined). 5. Century College Biology Class. At Prairie Farm, students planted shrubs and mulched near the parking lot. At Priory Preserve students did trail work, collected seed, and seeded trail edges. 6. Joy Park Buckthorn Removal. The buckthorn pull scheduled for October 6 was cancelled due to low registration. Century College students will pull buckthorn at the preserve on October 17.