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Home My WebLink About20230830 Environmental Board Packet Combined CITY OF LINO LAKES ENVIRONMENTAL BOARD MEETING Wednesday, August 30, 2023 6:30 p.m. Council Chambers Please be courteous and turn off all electronic devices during the meeting. AGENDA 1. CALL TO ORDER AND ROLL CALL 2. PLEDGE OF ALLEGIANCE 3. APPROVAL OF AGENDA 4. APPROVAL OF MINUTES: June 28, 2023 5. OPEN MIKE 6. DISCUSSION ITEMS A. Lake Amelia Ditch Study, Tom Hoffman, WSB 7. ACTION ITEMS A. Glamos Wire CUP Outdoor Storage B. Natural Landscapes Ordinance Amendment C. Artificial Turf Ordinance Amendment 8. ADJOURN Meeting guidelines on reverse side. City of Lino Lakes Environmental Board MEETING GUIDELINES Open Mike – The purpose of a Board Meeting is to accomplish the business of the city. When presenting at a meeting please remember to be respectful and follow these guidelines: • Please address the meeting chair. • State your name and address for the record. • Please observe a 4-minute limit. • The topic must relate to city business. • Open Mike is for items not on the agenda. • A spokesperson must represent a group of five or more – groups will have 8 minutes. • The Presiding Officer may limit duplicative presentations. • Remember, the meeting is to discuss city business only. Public Hearing – Held as a separate item of business on the agenda. The public hearing segment is your opportunity to tell the Board how you feel about issues scheduled to be heard. Typically, a hearing follows these steps: • The Presiding Officer (Chair or Vice-Chair) will announce the proposal to be reviewed and ask for the staff report. The presiding Officer shall maintain strict order and etiquette at all meetings. • Staff will present their report on the proposal. • Board members will then ask City Staff questions about the proposal. • The Presiding Officer will then open up the public hearing for anyone present who wishes to comment on the proposal. This is the time for the public to make comments or ask questions about the proposal. Comments should be limited to four (4) minutes unless further time is granted by the Presiding Officer. All comments should be directed to the Board as a body and not to any individual Board Member or City Staff Member unless permission is granted by the Presiding Officer. No person shall be permitted to enter into any discussion, either directly or through a member of the Board without the permission of the Presiding Officer. • After everyone in the audience wishing to speak has given his/her comments, the Presiding Officer shall close the public hearing. • The Board will then discuss the proposal. No further public comments are allowed. • The Board will then make a recommendation(s) and/or a decision. When you are called upon for your comments, please step to the microphone at the podium and state your name and address for the record. Occasionally, the Board may continue a hearing to another meeting before taking action. Meeting Etiquette The Environmental Board must preserve order and decorum while the meeting is in session. A resident shall not, by conversation or otherwise, delay or interrupt the proceedings or the business of the Board, nor disturb any resident or Board Member while speaking or refuse to obey the orders of the Board. CITY OF LINO LAKES ENVIRONMENTAL BOARD MEETING 1. CALL TO ORDER AND ROLL CALL Chair Sullivan called the Environmental meeting to order at 6:30 p.m. on June 28, 2023. 2. PLEDGE OF ALLEGIANCE 3. APPROVAL OF AGENDA The agenda was approved as presented. 4. APPROVAL OF MINUTES Mr. Sullivan approved the April 26, 2023 meeting minutes. Motion carried 6 – 0. 5. OPEN MIKE Mr. Sullivan declared open mike at 6:32 p.m. There was no one present for open mike and it was closed at 6:32 p.m. 6. ACTION ITEMS A. Watermark PUD Amendment #4 Preliminary Plat The applicant submitted a land use application for a Preliminary Plat Amendment for the DATE: June 28, 2023 TIME STARTED: 6:30 p.m. TIME ENDED: 7:37 p.m. MEMBERS PRESENT: John Sullivan, Cassie Cavegn, Shawn Holmes, Julia Nelson, Lindsay Buchmeier, Jonathan Parsons MEMBERS ABSENT: Alex Schwartz STAFF PRESENT: Andrew Nelson, Grace Good, Julie Whitney Environmental Board June 28, 2023 Page 2 DRAFT MINUTES Watermark project. The site is located just northwest of the intersection of 35E and Main Street (County State Aid Highway 14). Revisions to the northeast corner of the site include reduced lot sizes, increased open space area, and improved connectivity to a private park. The Board discussed the amended preliminary plat, and Mr. Nelson explained there are many environmental benefits of the revised submission, suggesting that it shrinks the footprint of the buildings, adds 2.7 acres of open space, increases native plant area, and improves connectivity to a park. Ms. Buchmeier made a motion to approve the Preliminary Plat with the recommendations presented by the Board. Ms. Cavegn seconded. Motion carried 6 – 0. 7. DISCUSSION ITEMS A. Lil’ Explorers Childcare Center Site Plan Update Mr. Nelson reviewed the updates to the Landscape Plan and the Tree Survey with the Board. Questions were asked and answered regarding placement, amount of trees and the types of trees being planted. Ms. Holmes addressed the restrictiveness of the Boards ability to require more from new businesses regarding recycling. Mr. Nelson responded that City Code requires that haulers provide the opportunity to recycle for residents and businesses, but it doesn’t require residents or businesses to recycle. B. Residential Recycling Service Frequency The Environmental Board revisited the benefits of weekly recycling pickup. Currently the ordinance requirement is bi-weekly pick up. The Board requested staff to research for more information. Mr. Nelson found that most, if not all, cities in Anoka County have bi-weekly recycling pickup. The haulers operating in Lino Lakes offer additional bins or larger bin options for low cost if residents are exceeding capacity. He also stated that garbage haulers expressed concerns that they would struggle to make weekly pickups due to staff shortages, high cost and wait times for new trucks, and other logistical reasons. Mr. Nelson noted that the MPCA has issued a draft version of the Metropolity Solid Waste Management Policy Plan. Weekly recycling is listed as one of the requirements for haulers and cities to achieve by 2025. Public comment is accepted on this plan. The MPCA is holding a public meeting on July 11th asking for feedback. Environmental Board June 28, 2023 Page 3 DRAFT MINUTES Mr. Nelson recommended waiting for the findings of the final report to act on weekly recycling, because it may be a requirement for the entire metro shortly. In the meantime, residents can get larger or additional bins from their haulers. Mr. Sullivan would like the information in the draft sent to the Board members after the meeting. 8. UPDATES A. Forestry Updates Mr. Nelson provided an update on the forestry program. They planted 51 developer trees, 48 city trees, 21 warranty trees, and 120 boulevard trees total. They did 33 bare root replacements related to a DNR grant, and sold 143 bare root trees at the City Tree Sale. They also arranged 70 EAB treatments with Rainbow Tree Care. Mr. Sullivan asked about the dead ash trees at businesses. Mr. Nelson said at this time the City is not marking trees on private property. B. Recycling Updates Ms. Gracie Good provided an update on the recycling program. She stated at the recent recycling Saturday they had 152 cars for appliance disposal, 53 visits for paper shredding and collected 17 tons of materials. This is the highest taken in so far this year. The organic site at Marshan Park was paved, and the enclosure should be ready in two to three weeks. She also said there are 498 people signed up for the organics drop off program. 9. ADJOURN Ms. Holmes made a motion to adjourn the meeting at 7:37 p.m. Motion was seconded by Mr. Parsons. Motion carried 6 – 0. Respectfully submitted, Julie Whitney – Community Development Administrative Assistant 1 ENVIRONMENTAL BOARD AGENDA ITEM 6A STAFF ORIGINATOR: Andy Nelson MEETING DATE: August 30th, 2023 REQUEST: Discussion Only TOPIC: Lake Amelia Ditch Study BACKGROUND Amelia Lake is a natural environment lake located in the southeast portion of Lino Lakes. The watershed area is approximately 754 acres. A private ditch serves as an outlet for approximately 340 acres of the watershed. The ditch corridor and adjacent wetlands are proposed components of the City’s parks, greenways, and trail system in the 2040 Comprehensive Plan. Recently, there has been flooding in the ditch corridor due to limited maintenance and failure of private culverts. This has raised concerns regarding long-term management of the system as development pressure increases upstream. In an effort to evaluate long-term stormwater management options for this subwatershed area, the City of Lino Lakes partnered with the Vadnais Lake Area Water Management Organization (VLAWMO) and WSB and Associates to prepare the Lake Amelia Ditch Study. Tom Hoffman, Engineering Technician with WSB and Associates, will be summarizing the results of the study and discussing the recommended next steps that follow from the study. ENVIRONMENTAL DIRECTION Discussion Only. ATTACHMENTS 1. Lake Amelia Study Area Map 2. Lake Amelia Ditch Study Ameila RMU CentervilleRMU ClearwaterCreek RMU Sherman RMU Wilkinson RMU City of Lino Lakes Lake Amelia Legend Private_Ditch Stu dy Are a Lake _Amelia_watersh ed 1 inch = 900 feet Subwatershed Study Area K:\020018-000\Admin\Docs\Memo\020018-000 Amelia Ditch Study Memo.docx Memorandum To: Michael Grochala, Lino Lakes Community Development Director Phil Belfiori, VLAWMO Administrator Diane Hankee, Lino Lakes City Engineer From: Earth Evans, PE, Director of Water Resources Tom Hoffman, Engineering Technician Henry Meeker, EIT Date: August 10, 2023 Re: Amelia Ditch Study WSB Project No. 020018-000 EXECUTIVE SUMMARY The Amelia Lake Ditch study was conducted with the goal of analyzing existing drainage conditions and proposing drainage improvements to the ditch draining to Lake Amelia within the City of Lino Lakes and the Vadnais Lake Area Water Management Organization (VLAWMO). The ditch has known flooding and other stormwater concerns in existing conditions. While these have been addressed in the past with localized private and public projects, the City aims to understand the problems along the entirety of the ditch and find solutions that best serve the surrounding properties Based on the existing concerns and anticipated future changes to the area, two phases of work are recommended. The short-term phase would consist of conveyance improvements to the section of the ditch currently causing the most problems for landowners. The long-term phase proposes more holistic improvements to the corridor that would occur alongside its eventual development. HISTORICAL BACKGROUND Based on the ditch alignment and surrounding topography, all signs indicate this was a constructed channel, not a natural stream. It is likely that the ditch was built and further expanded or modified based on agricultural needs in the surrounding areas. Where it is not serving direct surface flow drainage, the ditch also receives drain tile flows to aid in managing groundwater levels for nearby fields. This is supported by the broken remnants of a clay drain tile pipe found in the ditch during survey. All evidence indicates that this is and always has been a private ditch. No easement or maintenance records have been found supporting public ownership or management of the ditch. Maintenance has been conducted on a piecemeal basis depending on the needs and concerns of property owners along the ditch. Historical aerial images of the ditch have been found that date back to 1938. Th is oldest imagery appears to show the ditch with a slightly different and smaller alignment. However, certain stretches appear to be consistent with the current location. Imagery from 1957 shows the ditch with its current alignment. It appears much of the work bringing the ditch to its current condition occurred around this time. The spoil piles on either side of the channel appear in sharp relief and Amelia Ditch Study August 10, 2023 Page 2 with minimal vegetation cover. Later historical aerials show little changes to the ditch besides increased vegetation and development of I-35E and residential properties. EXISTING CONDITIONS The ditch to Lake Amelia serves a 255-acre drainage area, primarily consisting of agricultural and lightly developed residential areas. See the Existing Conditions Map in Appendix A for these drainage areas and Appendix B for modeled high water levels (HWLs) and peak flows. Table 1 below and the Parcels Map of Appendix A summarize the properties that cover this study area. Flows to the ditch originate in wetland complexes east of I-35E that collect runoff primarily from grassed and forest cover, with some roadway and residential impervious cover. T hese basins outlet via storm sewer running under I-35E to the two most upstream branches of the ditch. Property Address Parcel ID(s) Property Owner Culvert 6518 20th Ave 253122310003 253122320001 253122330001 Frances Burque A & B 1926 Birch St 263122410002 Farrell Properties LLC N/A 6483 20th Ave 263122440003 Judith Knabe D 6443 20th Ave 263122440005 Michael Kriegler N/A 6433 20th Ave 263122440004 Mathew and Mary Vesel E 1826 Birch St 263122430001 353122120001 James Cardinal Andrew Cardinal Jr F The northern branch of the ditch is in an agricultural area, within drainage areas 3, 4, and 5. There are two small basins on its upstream end that seem to empty in drier periods of the year. Between these basins is Culvert A that appears to have filled with sediment and likely does not provide any significant flows. The ditch section is less defined in this area, with widths varying from 10-20 feet and depths typically around 1-3 feet. The channel is dry much of the year, only seeing consistent water in the spring and around rainfall events. Outside of the channel is largely flat, HWLs are very likely to spill out from the channel and into the s urrounding fields. The southern branch of the ditch is also in an agricultural area, within drainage areas 7 and 8. There is a small basin on its upstream end that seems to empty in drier periods of the year. Culvert B runs below a driveway but similar to Culvert A, it appears to have filled with sediment and likely does not provide any significant flows. The upstream ditch section is roughly 20 feet wide and 2-3 feet deep. Downstream of the driveway crossing, the ditch section narrows to 10 -15 feet wide and depths decrease to 1-2 feet. The channel is dry much of the year, only seeing consistent water in the spring and around rainfall events. These branches converge roughly 300 feet east of 20th Ave, still in an agricultural area. The ditch section here is 20-25 feet wide and about 1 foot deep, with the exception of the pool just east of 20th Ave where the bottom is roughly 6 feet deep. There is a small channel running south to north that also drains into the ditch. Besides the pool, the channel is dry much of the year, only seeing consistent water in the spring and around rainfall events. The space outside the channel is largely flat and there are known flooding concerns in the area. The ditch crosses below 20th Ave via Culvert C, a 30” RCP. This culvert is well below much of the surrounding ground elevations, but above the bottom elevations of the pools on either side. Amelia Ditch Study August 10, 2023 Page 3 Culvert C is likely submerged year-round except during very dry conditions, as such, the condition of this pipe could not be verified during the survey. Modeling does not indicate that HWLs reach a point that the road overtops, even in the 100-year event. West of 20th Ave, the ditch turns to the southwest and follows a straight alignment through agricultural land. There is a fair degree of accumulated sediment downstream of the pool off Culvert C that settles from larger washout events. The ditch section is well define d here, with a width of 25 feet and depths of 3-5 feet. The channel appears to be inconsistently dry, likely depending more on downstream water levels. Outside of the channel is largely flat, HWLs are likely to spill out from the channel and into the surrounding fields. This ditch section drains through Culvert D on the 6483 20th Ave property. This culvert is 24” CPP with positive drainage, flowing beneath an access path on the property between the eastern and western sides of the ditch. Downstream of Culvert D, the ditch flows through a grassed and lightly forested area in a well- defined channel with spoils piled on either side. The channel section is 25-35 feet wide and 4-6 feet deep. There is a small tributary ditch north of the property line between 6443 and 6483 20th Ave that runs west to east into the channel that has formed a significant sediment delta, likely impeding flows upstream. The ditch likely has water in this section year-round due to poor downstream drainage. Modeled high water levels are c ontained in the channel with the exception of a small inundation area in the 6483 20th Ave property. This section of ditch drains through Culvert E on the 6433 20th Ave property. This culvert is 36” CPP that is back sloped and installed above an old culvert that was left in place. As such, Culvert E is higher than the others in the ditch and likely impounds water upstream. Through the 6483 20th Ave property, the ditch flows in grassed and lightly forested areas in a well-defined channel that has spoils piled on its north side. The channel section is 30-35 feet wide and 5-6 feet deep. Through the 1826 Birch St property, the ditch flows through more agricultural land, although there are some trees lining the channel. The channel section there is 30-40 feet wide and 4-5 feet deep, with flatter topography to the south that floods based on modeled HWLs. Both of these ditch sections likely have water year-round due to the poor condition of the Culvert F and tailwater effects from Lake Amelia. This culvert is a 30” CMP that is in poor condition. The middle of the pipe is heaved upwards, impounding water upstream. Additionally, water was observed flowing beneath the pipe, indicating the potential for Culvert F to wash out in the event of major flows through the ditch. Downstream of Culvert F, there is a section of ditch that eventually blends into Lake Amelia. The channel is roughly 40 feet wide and 3-5 feet deep where it is still defined as a ditch between agricultural fields. For the sake of this study, the end of the ditch was defined at the boundary between the fields and wetlands surrounding the lake. The water level in this section is functionally hydrostatic with the lake based on its profile and proximity. In existing conditions, there are known drainage concerns with the low-lying fields around ditch near its crossing of 20th Ave. While a fair amount of these HWLs can be attributed to the very flat nature of the ditch, the problems are exacerbated by sediment loading in the channel and culverts that are too high or in poor condition. The entirety of the ditch is shown as FEMA Zone A floodplain with no flood elevation; however, Lake Amelia has a mapped flood elevation of 910.2. In addition, there are currently no easements over the ditch which has led to confusion around which parties are responsible for its maintenance or impacts to upstream properties when changes are made. Amelia Ditch Study August 10, 2023 Page 4 PROPOSED CONDITIONS Improvements to the ditch are recommended to alleviate drainage problems and more efficiently convey flows. These recommended improvements generally fall into two categories, short-term and long-term. Short-term work is recommended within the next year or two and would consist of less significant work that would provide benefits to ditch conveyance with the goal of reducing flooding and ponded water. Long-term work is recommended with the eventual development of the area. This work would consist more of floodplain storage, BMP construction, and ditch realignment/meandering with the goal of floodplain and water quality improvements. This long- term work would likely come from the City as a recommended concept plan that would then be brought into final design and construction by a developer of the area. Short-Term Work The majority of proposed short-term improvements would consist of earthwork within and adjacent to the ditch channel, as shown in the Proposed Conditions Map of Appendix A. This work will be limited to the ditch alignment between 20th Ave and Culvert F. The City would obtain easements along the ditch to conduct the work and allow for future maintenance. Excavation is recommended to remove accumulated sediment from upstream loading, channel bed and bank scour, and settling around culverts. Much of this excavation would be within the top foot of the ditch bottom, up to 2 feet where more sediment has accumulated. The main intent of earthwork on the bottom of the channel is to provide a more consistent slope through the ditch. This would increase conveyance and reduce future sediment settling. Through much of the residential property (6433, 6443, and 6484 20th Ave), the channel slopes are sparsely vegetated and often steeper than 3:1. The proposed earthwork would bring these slopes to 3:1 at most in order to improve stability and reduce sediment loading from bank erosion. Decreasing these slopes would also slightly widen the channel section, further increas ing conveyance capacity of the ditch and reducing flood levels. This earthwork on the banks would only expand the channel footprint into the existing spoil piles and not impact the usable lawn areas observed during survey. This earthwork would also involve vegetation management. In areas not farmed, most of the vegetation observed during survey were lower quality trees and scrub along the banks of the ditch. During earthwork, many of these trees will need to be removed. This will provide an opportunity to replant with native grasses and other vegetation that is more resistant to erosion. Removal of trees will also bring more sunlight to the channel, further improving the uptake of new seeding. This proposed new vegetation would provide more consistent soil cover, stabilizing the banks and reducing sediment loading to the ditch. Another major component of the short-term work would be replacement of Culvert F. The pipe is recommended to be replaced with a 36” RCP with flared end sections instead of the existing 30” CMP. This replaced culvert would be placed lower to ensure it is not impounding water upstream like it currently does. Additionally, a properly bedded RCP will be more resistant to washing out unlike the risk posed to the current pipe. There is also potential to reseat the back sloped Culvert E as part of this project, but that is not a major priority since it was installed recently and seems to be functioning well. There is also an opportunity to excavate a small settling basin upstream of Culvert F. This would serve to provide additional settling and pollutant removals before the discharge to Lake Amelia. Expansion to the west would impact upland agricultural area and not require wetland impacts. As this basin would be relatively small with respect to the remaining floodplain and proposed channel Amelia Ditch Study August 10, 2023 Page 5 excavation, it is not anticipated to impact flood levels in any appreciable manner. Approximately 700 cubic yards of excavation would be needed to create this basin, with an estimated cost of $21,000. The modeling results presented in Appendix B show the drainage improvements expected as a result of this work. Since the short-term work takes place downstream of the 20th Ave road crossing, that’s where the majority of the modeled drainage improvements are shown. Within DA 11, the modeled 100-year HWL drops approximately 0.5’ from existing conditions due to increased downstream conveyance. This HWL decrease goes up to 3.4’ upstream of Culvert F. This pattern is reflected by the increased max flow rates in these same drainage areas. Modest increases from existing flows are shown for areas upstream of Culvert E, while major flow increases are seen leading up to and including the proposed replaced culvert. This will all serve to improve conveyance in the ditch and reduce water levels in major rain events . While the proposed modeling shows increased flow rates to Lake Amelia, adverse impacts are not anticipated to the lake’s hydrology or ecosystem. The ditch is proposed to be restored to as- built conditions, not a major rework of the channel. Much of the increase in flow capacity comes from improved ditch conveyance and replacing a failing culvert. These increased flows will not appreciably increase velocities into the lake due to the hundreds of feet of ditch downstream of the improvements attenuating flows. Additionally, the improved grading and stabilization will better dissipate energetic flow than in current conditions, reducing pollutant loading from erosive forces. This phase of the project is solely focused on conveyance of water to alleviate flooding concerns and does not propose to increase the volume of water reaching Lake Amelia in flood conditions. The increase in flow rates may slightly alter the lake’s flood hydrograph, but relative to the rest of the lake’s tributary area it is unlikely to increase high water levels. The majority of work in the short-term would consist of grading the ditch to improve conveyance, clearing nuisance vegetative canopy to encourage understory growth, and the replacement of Culvert F. In all, this work is estimated to cost $252,500 to complete. This cost includes a 30% contingency factor to account for potential changes to ditch conditions prior to work beginning. The estimate does not account for any potential costs for easement acquisition, if they are needed. A detailed breakdown of this estimate can be found in Appendix C. Long-Term Work As opposed to the short-term improvements, the long-term work is proposed for the current agricultural areas along the ditch. These properties, namely the 6518 20th Ave and 1926 Birch St parcels, are anticipated to develop into single family residential housing in the next 10-20 years. Development of these properties is currently limited by the lack of sanitary sewers. It is expected that the extension of the sewer from the west will drive development of these parcels. For development, the City could require out lots and easements along the existing ditch alignment to construct these more significant improvements. Alternatively, the City would still request the out lots, but instead recommend these improvements and the developments would take them into consideration for their requisite stormwater management facilities. With this larger project, the ditch alignment would be proposed to meander similar to a natural stream, as opposed to the current sharp turns and straight channel sections. This meandering portion would have a wider and more gently sloped channel section. The ditch would have improved ecological value as the meander provides a variety of flow conditions and water depths for plant and animal life. In addition, a meandering alignment improves the aesthetics and recreational value of the area. With the potential trail extending through the area from the west, this region could serve as a greenway space for the City. Amelia Ditch Study August 10, 2023 Page 6 Another component of the long-term work would be floodplain management in the area. With the known flooding concerns and FEMA floodplain designation, it is evident that the area surrounding the ditch would be well served by increased flood storage capacity. This capacity would come in the form of large basins adjacent to the ditch. In major storm events, the ch annel would overtop its banks and flow into these basins. This increased storage will reduce flooding concerns for the existing properties downstream, as well as slightly ease flood levels within Lake Amelia. These basins would also provide ecological value and water quality treatment. Depending on the proposed planting and hydrologic regimes, the basins may be restored to different wetland types. Based on how much of the area is delineated as wetland, these restored wetlands would offset any impacts from development or increase their footprint. Similar to the proposed basins on the Shenandoah Improvement Project, these would be proposed to draw down via evapotranspiration or very slow groundwater infiltration. This abstracted runoff would result in a signi ficant degree of pollutant removals from Lake Amelia as well as provide dynamic habitats for plant and animal life. For more direct water quality treatment, biofiltration BMPs are proposed on further upstream areas where there is sufficient elevation difference. Soil information indicates in situ soils are conducive to filtration when provided an underdrain. As such, biofiltration basins could be constructed offline from the ditch alignment at minimal cost. These basins would not serve as significant floodplain or ecological value but would further increase pollutant removals. Significant drainage improvements are seen in the modeling as a result of this proposed work, as summarized in Appendix B. Due to impounded flows in the proposed biofiltration basins, HWLs are increased slightly in the drainage areas upstream of them. However, these are not areas with drainage concerns, increased HWLs will not cause major flood area increases. There are HWL decreases of 1.1’ in DA 5 and DA 9 because of the increased storage proposed in the wetlands alongside the ditch channel. Further downstream, HWLs drop more, up to 2.7’. This is both an effect of the ditch cleanout in the short-term and an anticipated replacement of Culvert E in the medium- to long-term. Additionally, flow rates increase significantly across the site, especially around the culverts that would be replaced. Some flow rates were modeled to decrease near the biofiltration basins and wetlands due to changes in flood storage, but overall, the system will allow for greater flows. This long-term work includes many more benefits to the tributary area to the lake but comes at an increased cost compared to the short-term improvements. The total estimated cost for the work is $1.71 million, plus an additional $150,000 in wetland maintenance and monitoring over the 5 years following the project. The majority of these costs are anticipated from the large volumes of earthwork required to create the wetland and filtration basins. Additional costs come from storm sewer required for the BMPs and the required seeding over the large area of disturbance. This cost includes a 30% contingency factor to account for potential changes between this concept and future design implementation. It should be noted that this estimate is unlikely to be accurate by the time major development is occurring in the area and will need to be revised to reflect updated costs in the future The estimate does not account for any potential costs for easement or property acquisition for the stormwater features. A detailed breakdown of this estimate can be found in Appendix C. WATER QUALITY MONITORING Water quality samples were collected monthly within Lake Amelia and the ditch to Lake Amelia from May through August 2022. See the Water Quality Sampling Location map found in Appendix A. Data was collected to understand the existing water quality and how the water from the ditch may affect Lake Amelia’s water quality. Samples were analyzed for total phosphorus, orthophosphate, and total suspended solids. Results can be seen in Figures 1-3 below. Amelia Ditch Study August 10, 2023 Page 7 Figure 1: TSS Results Figure 2: TP Results Amelia Ditch Study August 10, 2023 Page 8 Figure 3: OP Results Results show Lake Amelia having steady water quality throughout the 2022 season. Total phosphorus levels within the lake were below the state standards for shallow lakes. During sampling events it was noted that the lake was visually clear to the bottom and is heavily vegetated. Overall, the TSS, TP, and OP concentrations are much lower in the lake compared to the ditch. The drought conditions in 2022 provided very low to no flow within the ditch. No visible flow was observed while sampling. Sampling at times of flow would provide better understanding on sediment and nutrient transport into the lake. Increased pollutant loading in the ditch could contribute to an increase of pollutants entering Lake Amelia during large rain events. Dredging existing sediment deltas and stabilizing erosion within the ditch would limit the amount of TP and TSS that would be able to reach the lake. PERMITTING As this work takes place in a ditch draining wetlands to a public water, local, state, and federal permitting will be needed. VLAWMO is the LGU for the Wetland Conservation Act (WCA) and the City of Lino Lakes regulates stormwater management. As this project has been undertaken collaboratively with VLAWMO, communication will continue regarding the required regulations that must be followed for any proposed work. WCA compliance must be demonstrated for work on drainage systems such as this ditch. Short- term work will consist of maintenance of the ditch to its original capacity based on historical aerials and field visits. There are numerous wetlands around the ditch, however they have not been delineated as part of this phase. These wetlands have current or recent cropping history based on aerial imagery and field visits. Filling or excavation of wetlands not proposed as short- term work will be limited almost entirely to the ditch channel. The full maintenance history of the system is not known as it has been under private ownership; a full cleanout of the ditch has not been performed. Recent maintenance history includes culvert replacement at Culverts D and E by the City, plus evidence of past maintenance of Culvert F based on observations during a field visit. As the proposed long-term improvements will change the drainage system beyond its historical constructed conditions, more involved permitting will be required and factored into final design. Compliance will need to be demonstrated around ditch capacity expansion and Amelia Ditch Study August 10, 2023 Page 9 excavation and filling of wetlands. Full WCA permitting will be completed as needed before construction for both short- and long-term ditch work. Lake Amelia is listed as a Minnesota DNR public water (ID 02001400). As such, any work that is proposed within the lake must be permitted through the DNR. Based on preliminary conversations, it is anticipated that DNR regulated activity will be limited to any proposed work downstream of the hydrologic break line at Culvert F. There will be a small amount of earthwork proposed in this section of the ditch with the short-term improvements and as such, a DNR permit must be applied for. Additionally, the ditch is shown as a DNR stream in their online surface water viewer. However, this is a private ditch and has been for more than 50 years. Further coordination will be conducted with the DNR to determine its status as a public waters stream and how it may impact permitting requirements. Per the US Army Corps of Engineers (USACE), wetlands that drain to a public water are considered within their permitting jurisdiction. Since this ditch is closely related to the formation and draining of its adjacent wetlands and flows to Lake Amelia, these wetlands would likely fall under USACE jurisdiction. As such, any work in the short- or long-term that may impact the hydrology of these wetlands will need to be permitted through the Corps in addition to WCA and the DNR. Much of the area is listed as FEMA floodplain. Therefore, any work that would significantly alter floodplain levels would need review. This would not apply with the proposed short-term work, but the long-term work would likely require federal permitting. Amelia Ditch Study August 10, 2023 Page 10 APPENDIX A: PROJECT MAPS 6443 20TH AVE KRIEGLER, MICHAEL J Parcel ID: 263122440005 BURQUE, FRANCES GEORGE Parcel ID: 253122310003 6518 20TH AVE BURQUE, FRANCES GEORGE Parcel ID: 253122320001 BURQUE, FRANCES GEORGE Parcel ID: 253122330001 6433 20TH AVE VESEL MATHEW P & MARY E Parcel ID: 263122440004 6483 20TH AVE KNABE JUDITH Parcel ID: 263122440003 1926 BIRCH ST FARRELL PROPERTIES LLC Parcel ID: 263122410002 CARDINAL, JAMES G Parcel ID: 263122420002 CARDINAL JR, ANDREW J Parcel ID: 353122120001 1826 BIRCH ST CARDINAL, JAMES G Parcel ID: 263122420001 CARDINAL, JAMES G Parcel ID: 263122430001 Culvert A Culvert B Culvert F Culvert E Culvert D Culvert C Document Path: K:\020018-000\GIS\Maps\WR Map\Parcel Map Date Saved: 6/16/2023¯1 inch = 500 feet 0 500 FeetAmelia Ditch Drainage Study City of Lino Lakes Figure 1: Project Parcels Page 11 "" " """"""""""""" """"""" """"""""""" " " #* #* #*#* #* #*#* #*#* #*#* #*#* #*#*#*#* #*#* #*#*#*#*#*#*#*#* #*#* #*#* #*#* #* #* #* #* #* #* #* #*#*#* #*#*#*#*#* #*#*#*#* #*#*#*#* #*#* #* #* #* #* #*#*#* #* #* #*#* #* #* #* #*#* #*#*#*#*#* #* #*#* #*#*#* #* #*#* #*#*#*#* #* #* #* #*#*#*#*#*#*#*#* #* #* #* #*#* #* #* #*#* #* #*#*#*#* #*#*#*#* #* #* #*#*#* #* !( !( !(!( !( !( !( !(!( !(!( !( !( !(912926908930928922 924920916 918920908 926926920908916942 92 2922 922912908 9249309 2 0936928 936928 9 00932 908934 924 910 906 91 4 924930 9 1 0 932926 898 9 2 6 922924928 9529209309 1 4 930912914914926912 912910934 932910904926918 928928910932 926900902910 910920 924914 9289 3 8 9349189 1 4926928 9 0 8 924910944940924 916 92 4 954928916916 9189089 34 9 24 930922 9229 14934916 914904 920932918 91893 2 93492 6 942928 924918922928 9 3 093695092692291891693 0 9349329249209 0 6 9 18936900 930 934930 926922 9229 24924928930926928898 92890892692 69289 1 8 9249289189129 12 9289 1893 291 0924924 916924 9249 26 93294291 6928 934 934926930924 9329 02 924926 912948 924 9 2 2 9 1 8 9189 40922922 9 1 29349 3 2926 918 9 3 8908 90893891292 6 912 9289 2 8928 9309269329109329309 18922926924916 9049 24916 926 9289 3 8 946900 9 429 16 9 4 8928930 9 249 1 2 9 2 8 92292491691291 0930930 93 0 9 28900 9 1 4942922924 9309 32916 9 3 4 934 91893093 2 936 93093892 6 9 12910920 926 924 938914930914 9 26 9 4 09 2893492492 4898 9 2 69 32 932916938920904 9 2 89 24926920916 9229289 1 4932934 9209 32 93 4 9 10 930916922 930 92892 6 9169 1 4 92 8900930 9129409 28 91892091493 0 934922 934 9 4 09549449149289 28908940922912 924914930 92 6 9 2 2 9129 26 9189309409109 1 2938924 9229209 1292 8 9309109129 4 4910 924 918 9 1 4 9 38 92092 4 9 30928928 9 2 0912 918 902918 926902 9369 32 922932928934 930910 9349309 349329249249 2 6916 914928932 948 9 2 4 920930 92 8900 914928928 926914 922 926 912 9409 1692 8 9 3 6 928 914 9 2 4 9 1 2 930 9189 3 2 9 1 292292 0932926 9149 149209249 2 6 910 918 9 28934918 9329389289249229269209 38 924 93 4 9 2 2924 930 93 6 9269 36928 93091 6 92692690291492 8930 92092 4 9209309 1 8 916 92 8 930 926 93 0 9249169 14 93092 8 928924 928 922 914910 928 9529 1 6 9249269 2 2916914934926926942920940 9129 3 2 932914920930 9 1 4 9 229 3 4 938 9269149249 44924910918936 92292892292 8928 916 924946924 932936932 926922 9 2 6 9 349109189 4 2 918918 934930 928 9 5 0 9 32 9409089269 3 29 2 2 91 8926932 932 91 0930924900 9249169489 3093093292494 6 918 920922 92 8 916914930 91 6 9 44930 9309 2 8 9309329289329029 3 0930 926 94 2920 9409 18926 9 1 2908906 934908 93493891892493893692692891091092092693690891092892 0 912 904 934914 9269309 3 0928 926916 9329 1 8 928928920 9 2 2 9109109 1 2 922 9209189 1 0918924914916 926 928 916 9249229149 1 4 9 16920918922 926 912 9241 2 6 3 7 8 4 5 9 10 11 12 Document Path: K:\020018-000\GIS\Maps\WR Map\Existing Conditions Date Saved: 6/15/2023¯1 inch = 500 feet 0 500 FeetAmelia Ditch Drainage Study City of Lino Lakes Figure 2: Existing Conditions Existing 100-yr HWL Subcatchments Lake Amelia 100-yr HWL Contour 10 ft 2 ft Page 12 35E 35E 35E """""""""""""!( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !( !(1 2 6 3 7 8 4 5 9 10 11 12 Pipe 5 Pipe 6 Pipe 3 Pipe 4 Channel 11 Channel 6 Channel 1 Channel 3 Channel 10 Channel 0 Channel 4 Channel 2 Pipe 1 Channel 13 Pipe 2 Channel 8 DA-1 DA-2 DA-3 DA-4 DA-5 DA-6 DA-7 DA-8 DA-9 DA-10 DA-11 DA-12 Junction 1 Junction 3 Junction 4 Junction 5 Junction 2 Document Path: K:\020018-000\GIS\Maps\WR Map\Model Elements Date Saved: 6/15/2023¯1 inch = 500 feet 0 500 FeetAmelia Ditch Drainage Study City of Lino Lakes Figure 3: XPSWMM Model Elements !(Model Nodes Model Conduits Subcatchments Page 13 "" " """"""""""""" """"""" """"""""""" " " #* #* #*#* #* #*#* #*#* #*#* #*#* #*#*#*#* #*#* #*#*#*#*#*#*#*#* #*#* #*#* #*#* #* #* #* #* #* #* #* #*#*#* #*#*#*#*#* #*#*#*#* #*#*#*#* #*#* #* #* #* #* #*#*#* #* #* #*#* #* #* #* #*#* #*#*#*#*#* #* #*#* #*#*#* #* #*#* #*#*#*#* #* #* #* #*#*#*#*#*#*#*#* #* #* #* #*#* #* #* #*#* #* #*#*#*#* #*#*#*#* #* #* #*#*#* #* !( !( !(!( !( !( !( !(!( !(!( !( !( !(912926908930928922 924920916 918920908 926926920908916942 92 2922 922912908 9249309 2 0936928 936928 9 00932 908934 924 910 906 91 4 924930 9 1 0 932926 898 9 2 6 922924928 9529209309 1 4 930912914914926912 912910934 932910904926918 928928910932 926900902910 910920 924914 9289 3 8 9349189 1 4926928 9 0 8 924910944940924 916 92 4 954928916916 9189089 34 9 24 930922 9229 14934916 914904 920932918 91893 2 93492 6 942928 924918922928 9 3 093695092692291891693 0 9349329249209 0 6 9 18936900 930 934930 926922 9229 24924928930926928898 92890892692 69289 1 8 9249289189129 12 9289 1893 291 0924924 916924 9249 26 93294291 6928 934 934926930924 9329 02 924926 912948 924 9 2 2 9 1 8 9189 40922922 9 1 29349 3 2926 918 9 3 8908 90893891292 6 912 9289 2 8928 9309269329109329309 18922926924916 9049 24916 926 9289 3 8 946900 9 429 16 9 4 8928930 9 249 1 2 9 2 8 92292491691291 0930930 93 0 9 28900 9 1 4942922924 9309 32916 9 3 4 934 91893093 2 936 93093892 6 9 12910920 926 924 938914930914 9 26 9 4 09 2893492492 4898 9 2 69 32 932916938920904 9 2 89 24926920916 9229289 1 4932934 9209 32 93 4 9 10 930916922 930 92892 6 9169 1 4 92 8900930 9129409 28 91892091493 0 934922 934 9 4 09549449149289 28908940922912 924914930 92 6 9 2 2 9129 26 9189309409109 1 2938924 9229209 1292 8 9309109129 4 4910 924 918 9 1 4 9 38 92092 4 9 30928928 9 2 0912 918 902918 926902 9369 32 922932928934 930910 9349309 349329249249 2 6916 914928932 948 9 2 4 920930 92 8900 914928928 926914 922 926 912 9409 1692 8 9 3 6 928 914 9 2 4 9 1 2 930 9189 3 2 9 1 292292 0932926 9149 149209249 2 6 910 918 9 28934918 9329389289249229269209 38 924 93 4 9 2 2924 930 93 6 9269 36928 93091 6 92692690291492 8930 92092 4 9209309 1 8 916 92 8 930 926 93 0 9249169 14 93092 8 928924 928 922 914910 928 9529 1 6 9249269 2 2916914934926926942920940 9129 3 2 932914920930 9 1 4 9 229 3 4 938 9269149249 44924910918936 92292892292 8928 916 924946924 932936932 926922 9 2 6 9 349109189 4 2 918918 934930 928 9 5 0 9 32 9409089269 3 29 2 2 91 8926932 932 91 0930924900 9249169489 3093093292494 6 918 920922 92 8 916914930 91 6 9 44930 9309 2 8 9309329289329029 3 0930 926 94 2920 9409 18926 9 1 2908906 934908 93493891892493893692692891091092092693690891092892 0 912 904 934914 9269309 3 0928 926916 9329 1 8 928928920 9 2 2 9109109 1 2 922 9209189 1 0918924914916 926 928 916 9249229149 1 4 9 16920918922 926 912 9241 2 6 3 7 8 4 5 9 10 11 12 Document Path: K:\020018-000\GIS\Maps\WR Map\Proposed Short Term Date Saved: 8/10/2023¯1 inch = 500 feet 0 500 FeetAmelia Ditch Drainage Study City of Lino Lakes Figure 4: Proposed Conditions - Short-Term Subcatchments Lake Amelia 100-yr HWL Settling Basin Contour 10 ft 2 ft Replace with 36" RCP Culvert and Excavate Settling Basin 3.4' HWL Decrease 0.5' HWL Decrease No HWL Decrease 0.2' HWL Decrease 0.2' HWL Decrease Remove 0.9' of Sediment from Channel Bottom Remove 0.6' of Sediment from Channel Bottom Remove 0.5' of Sediment from Channel Bottom Page 14 35E 35E 35E "" " """"""""""""" """"""" """"""""""" " " #* #* #*#* #* #*#* #*#* #*#* #*#* #*#*#*#* #*#* #*#*#*#*#*#*#*#* #*#* #*#* #*#* #* #* #* #* #* #* #* #*#*#* #*#*#*#*#* #*#*#*#* #*#*#*#* #*#* #* #* #* #* #*#*#* #* #* #*#* #* #* #* #*#* #*#*#*#*#* #* #*#* #*#*#* #* #*#* #*#*#*#* #* #* #* #*#*#*#*#*#*#*#* #* #* #* #*#* #* #* #*#* #* #*#*#*#* #*#*#*#* #* #* #*#*#* #* !( !( !(!( !( !( !( !(!( !(!( !( !( !(912926908930928922 924920916 918920908 926926920908916942 92 2922 922912908 9249309 2 0936928 936928 9 00932 908934 924 910 906 91 4 924930 9 1 0 932926 898 9 2 6 922924928 9529209309 1 4 930912914914926912 912910934 932910904926918 928928910932 926900902910 910920 924914 9289 3 8 9349189 1 4926928 9 0 8 924910944940924 916 92 4 954928916916 9189089 34 9 24 930922 9229 14934916 914904 920932918 91893 2 93492 6 942928 924918922928 9 3 093695092692291891693 0 9349329249209 0 6 9 18936900 930 934930 926922 9229 24924928930926928898 92890892692 69289 1 8 9249289189129 12 9289 1893 291 0924924 916924 9249 26 93294291 6928 934 934926930924 9329 02 924926 912948 924 9 2 2 9 1 8 9189 40922922 9 1 29349 3 2926 918 9 3 8908 90893891292 6 912 9289 2 8928 9309269329109329309 18922926924916 9049 24916 926 9289 3 8 946900 9 429 16 9 4 8928930 9 249 1 2 9 2 8 92292491691291 0930930 93 0 9 28900 9 1 4942922924 9309 32916 9 3 4 934 91893093 2 936 93093892 6 9 12910920 926 924 938914930914 9 26 9 4 09 2893492492 4898 9 2 69 32 932916938920904 9 2 89 24926920916 9229289 1 4932934 9209 32 93 4 9 10 930916922 930 92892 6 9169 1 4 92 8900930 9129409 28 91892091493 0 934922 934 9 4 09549449149289 28908940922912 924914930 92 6 9 2 2 9129 26 9189309409109 1 2938924 9229209 1292 8 9309109129 4 4910 924 918 9 1 4 9 38 92092 4 9 30928928 9 2 0912 918 902918 926902 9369 32 922932928934 930910 9349309 349329249249 2 6916 914928932 948 9 2 4 920930 92 8900 914928928 926914 922 926 912 9409 1692 8 9 3 6 928 914 9 2 4 9 1 2 930 9189 3 2 9 1 292292 0932926 9149 149209249 2 6 910 918 9 28934918 9329389289249229269209 38 924 93 4 9 2 2924 930 93 6 9269 36928 93091 6 92692690291492 8930 92092 4 9209309 1 8 916 92 8 930 926 93 0 9249169 14 93092 8 928924 928 922 914910 928 9529 1 6 9249269 2 2916914934926926942920940 9129 3 2 932914920930 9 1 4 9 229 3 4 938 9269149249 44924910918936 92292892292 8928 916 924946924 932936932 926922 9 2 6 9 349109189 4 2 918918 934930 928 9 5 0 9 32 9409089269 3 29 2 2 91 8926932 932 91 0930924900 9249169489 3093093292494 6 918 920922 92 8 916914930 91 6 9 44930 9309 2 8 9309329289329029 3 0930 926 94 2920 9409 18926 9 1 2908906 934908 93493891892493893692692891091092092693690891092892 0 912 904 934914 9269309 3 0928 926916 9329 1 8 928928920 9 2 2 9109109 1 2 922 9209189 1 0918924914916 926 928 916 9249229149 1 4 9 16920918922 926 912 9241 2 6 3 7 8 4 5 9 10 11 12 Document Path: K:\020018-000\GIS\Maps\WR Map\Proposed Long Term Date Saved: 6/15/2023¯1 inch = 500 feet 0 500 FeetAmelia Ditch Drainage Study City of Lino Lakes Figure 5: Proposed Conditions - Long-Term Proposed BMPs Proposed Meandered Channel Subcatchments Proposed 100-yr HWL Lake Amelia 100-yr HWL Contour 10 ft 2 ft South Filtration Basin North Filtration Basin Wetland 1 Wetland 2 Wetland 3 Page 15 K:\020018-000\Graphics\020018-000 Amelia DitchAmelia Ditch Concept Plan Lino Lakes, MN July 21, 2023 | WSB Project number: 020018-000 Scale in Feet 0’400’200’ AMELIA LAKE PROPOSED TRAIL PROPOSED CHANNEL ROUTE PLUNGE POOL OTTER LAKE RD20TH AVE SBIRCH STREET PROPOSED WETLAND PROPOSED FILTRATION BASIN EXISTING FLOOD PLAIN EXISTING WETLAND TYPICAL TRAIL SECTION 10’ TRAIL DISTANCE VARIES WATER CHANNEL Amelia Ditch Study August 10, 2023 Page 16 APPENDIX B: MODELING RESULTS Amelia Ditch Study August 10, 2023 Page 17 Table 1: Short-Term Improvements 100-yr HWL Comparison Model Node Existing HWL Proposed HWL Change DA-1 928.79 928.79 0 DA-2 915.18 915.18 0 DA-3 913.81 913.81 0 DA-4 911.53 911.53 0 DA-5 910.19 910.02 -0.17 DA-6 916.43 916.43 0 DA-7 915.06 915.06 0 DA-8 915.02 915.02 0 Junction 1 910.19 910.02 -0.17 DA-9 910.19 910.02 -0.17 Junction 2 910.16 910.15 -0.01 DA-10 910.16 910.16 0 Junction 3 911.30 910.81 -0.51 Junction 4 911.30 910.81 -0.51 DA-11 911.30 910.81 -0.49 Junction 5 910.90 908.48 -2.42 DA-12 910.89 907.48 -3.41 Table 2: Short-Term Improvements Max Flow Comparison Model Connection Existing Max Flow (cfs) Proposed Max Flow (cfs) Change Pipe 1 29.76 29.76 0 Channel 1 48.80 48.80 0 Channel 2 33.64 33.66 +0.02 Channel 0 14.61 18.08 +3.47 Pipe 2 12.53 12.53 0 Channel 3 80.50 80.51 +0.01 Channel 5 89.93 89.95 +0.02 Channel 6 22.29 26.85 +4.56 Pipe 3 16.13 20.89 +4.76 Channel 8 15.29 20.57 +5.28 Pipe 4 16.39 22.72 +6.33 Channel 10 16.44 22.92 +6.48 Channel 11 16.72 23.16 +6.44 Pipe 5 40.33 71.04 +30.71 Channel 13 39.19 71.17 +31.98 Pipe 6 44.19 104.10 +59.91 Amelia Ditch Study August 10, 2023 Page 18 Table 3: Long-Term Improvements 100-yr HWL Comparison Model Node Existing HWL Proposed HWL Change DA-1 928.79 928.79 0 DA-2 915.18 915.18 0 DA-3 913.81 913.81 0 DA-4 911.53 913.05 +1.53 DA-5 910.19 909.01 -1.18 DA-6 916.43 916.45 +0.02 DA-7 915.06 915.37 +0.31 DA-8 915.02 915.36 +0.34 Junction 1 910.19 909.06 -1.14 DA-9 910.19 909.06 -1.13 Junction 2 910.16 909.56 -0.60 DA-10 910.16 909.76 -0.40 Junction 3 911.30 909.47 -1.84 Junction 4 911.30 909.45 -1.85 DA-11 911.30 909.45 -1.86 Junction 5 910.90 908.58 -2.32 DA-12 910.89 908.13 -2.75 Table 4: Long-Term Improvements Max Flow Comparison Model Connection Existing Max Flow (cfs) Proposed Max Flow (cfs) Change Pipe 1 29.76 30.07 +0.31 Channel 1 48.80 48.81 +0.01 Channel 2 33.64 169.28 +135.64 Channel 0 14.61 21.00 +6.39 Pipe 2 12.53 12.10 -0.43 Channel 3 80.50 51.68 -28.82 Channel 5 89.93 41.92 -48.01 Channel 6 22.29 20.44 -1.85 Pipe 3 16.13 22.47 +6.34 Channel 8 15.29 56.13 +40.84 Pipe 4 16.39 75.85 +59.46 Channel 10 16.44 76.94 +60.50 Channel 11 16.72 78.89 +62.17 Pipe 5 40.33 118.23 +77.90 Channel 13 39.19 119.36 +80.17 Pipe 6 44.19 141.03 +96.84 Amelia Ditch Study August 10, 2023 Page 19 APPENDIX C: COST ESTIMATES Amelia Ditch Study August 10, 2023 Page 20 Cost Estimate - Short Term Description Units Contract Quantity Unit Price Total Price MOBILIZATION LS 1 $15,000 $15,000 CLEAR AND GRUB LS 1 $25,000 $25,000 DEWATERING LS 1 $20,000 $20,000 COMMON EXCAVATION C C Y 700 $30 $21,000 CHANNEL EXCAVATION C Y 1500 $40.00 $60,000 RANDOM RIPRAP CL III C Y 30 $120 $3,600 36" RCP L F 31 $220 $6,820 36" RCP APRON EACH 2 $3,200 $6,400 STABILIZED CONSTRUCTION ENTRANCE EACH 1 $1,500 $1,500 FLOATING SILT CURTAIN L F 20 $40 $800 EROSION CONTROL BLANKET S Y 3500 $3 $10,500 WOOD FIBER BIOROLL L F 5500 $3 $16,500 SEEDING ACRE 1.5 $2,000 $3,000 SEED MIX 33-261 LB 55 $75 $4,125 30% Contingency $58,300 Total: $252,500 Amelia Ditch Study August 10, 2023 Page 21 Cost Estimate - Long Term Description Units Contract Quantity Unit Price Total Price MOBILIZATION LS 1 $150,000 $150,000 CLEAR AND GRUB EACH 20 $1,000 $20,000 COMMON EXCAVATION C Y 45000 $20 $900,000 COMMON EMBANKMENT C Y 4500 $20 $90,000 RANDOM RIPRAP CL III C Y 30 $120 $3,600 6" PERF HDPE PIPE LF 860 $24 $20,640 6" PERF HDPE PIPE CLEANOUT EACH 10 $500 $5,000 15" RCP L F 75 $100 $7,500 15" RCP APRON EACH 5 $1,500 $7,500 FLAP GATE/DUCKBILL VALVE EACH 3 $3,000 $9,000 48" OCS EACH 2 $10,000 $20,000 STABILIZED CONSTRUCTION ENTRANCE EACH 1.00 $1,500 $1,500 FLOATING SILT CURTAIN L F 20 $40 $800 EROSION CONTROL BLANKET S Y 15000 $3 $45,000 WOOD FIBER BIOROLL L F 5000 $3 $15,000 SEEDING ACRE 8 $2,000 $16,000 SEED MIX 33-261 LB 55 $75 $4,125 30% Contingency $394,700 Total: $1,710,400 Amelia Ditch Study August 10, 2023 Page 22 APPENDIX D: SURVEY DATA AND SITE PHOTOS Surveyed Ditch Profile 902 903 904 905 906 907 908 909 910 911 912 0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000Elevation Distance from Lake Amelia (ft) Existing Ditch Profile Existing Culverts Amelia OHWL Amelia Ditch Study June 19, 2023 Page 23 BURQUE, FRANCES GEORGE Parcel ID: 253122310003 6518 20TH AVE BURQUE, FRANCES GEORGE Parcel ID: 253122320001 SPOT 910.3 SPOT 911.297SPOT 911.082 SPOT 910.75SPOT 910.151 SPOT 910.61SPOT 910.633 SPOT 911.088 SPOT 910.745 SPOT 912.912 SPOT 913.142 SPOT 913.892 SPOT 912.836 SPOT 913.003 SPOT 913.1 SPOT 913.05 SPOT 910.551SPOT 911.14 SPOT 909.878 SPOT 910.153 SPOT 910.327 SPOT 910.673 SPOT 910.95 SPOT 910.338 SPOT 910.236 SPOT 911.792 FES 910.413 SPOT 909.73 SPOT 909.361 SPOT 910.727 SPOT 910.841 SPOT 910.714 SPOT 911.059 SPOT 908.913 SPOT 911.074SPOT 911.037 SPOT 912.705 SPOT 912.829 FES 911.346 FES 913.154 Document Path: K:\020018-000\GIS\Maps\WR Map\Survey Map Date Saved: 6/16/2023¯ 1 inch = 80 feet 0 80 FeetAmelia Ditch Drainage Study City of Lino Lakes Survey Map 1 Parcels 918.131 906.756 Elevation SPOT MARSH FES Survey Point Page 24 BURQUE, FRANCES GEORGE Parcel ID: 253122310003 6518 20TH AVE BURQUE, FRANCES GEORGE Parcel ID: 253122320001 BURQUE, FRANCES GEORGE Parcel ID: 253122330001 SPOT 914.895SPOT 912.836 SPOT 915.993SPOT 914.55 SPOT 918.199SPOT 916.001 SPOT 913.792 SPOT 912.961 SPOT 912.779SPOT 914.07 SPOT 915.062 SPOT 914.767 SPOT 913.784 SPOT 914.961 SPOT 915.35 SPOT 913.839 SPOT 912.795 FES 913.479 SPOT 914.272 SPOT 912.989 SPOT 913.111SPOT 914.715 SPOT 913.302 SPOT 910.774 SPOT 910.838 SPOT 913.414 SPOT 911.234 SPOT 913.777 SPOT 912.067 SPOT 914.27 Document Path: K:\020018-000\GIS\Maps\WR Map\Survey Map Date Saved: 6/16/2023¯ 1 inch = 80 feet 0 80 FeetAmelia Ditch Drainage Study City of Lino Lakes Survey Map 2 Parcels 918.131 906.756 Elevation SPOT MARSH FES Survey Point Page 25 6518 20TH AVE BURQUE, FRANCES GEORGE Parcel ID: 253122320001 SPOT 908.775 SPOT 907.502 SPOT 908.74 SPOT 909.141 SPOT 908.354 SPOT 908.831 SPOT 908.032 SPOT 907.493 SPOT 908.581 SPOT 908.407 SPOT 907.607 SPOT 909.03 SPOT 908.734 SPOT 907.462 SPOT 908.988 SPOT 908.647 SPOT 908.43 SPOT 907.72 SPOT 907.558 SPOT 908.377 SPOT 908.644 SPOT 909.105 SPOT 908.499 SPOT 908.417 SPOT 907.651 SPOT 909.942SPOT 910.011 SPOT 908.777 SPOT 909.547 SPOT 909.677 SPOT 909.774 SPOT 908.813 SPOT 908.776 SPOT 908.821 SPOT 908.55 SPOT 907.661 SPOT 908.291 SPOT 908.636 SPOT 908.227 SPOT 907.196 SPOT 908.636 SPOT 908.638 SPOT 908.819 SPOT 908.987 SPOT 908.177 SPOT 907.228 SPOT 907.371 SPOT 908.288 SPOT 908.663 SPOT 908.772 SPOT 910.662 SPOT 910.077 SPOT 909.489 SPOT 908.369 SPOT 909.148 SPOT 909.054 SPOT 913.522 SPOT 913.801SPOT 913.793 SPOT 914.353 SPOT 912.001 SPOT 914.921SPOT 915.582 SPOT 914.823 SPOT 908.775 SPOT 907.722 SPOT 906.544 SPOT 906.717 SPOT 907.692 SPOT 908.055 SPOT 906.996 SPOT 906.978 SPOT 907.709 SPOT 906.678 SPOT 906.74SPOT 907.844 SPOT 907.782 SPOT 907.229 SPOT 908.305 SPOT 914.048 SPOT 911.9 SPOT 914.371 SPOT 913.653 SPOT 911.191 SPOT 913.66 SPOT 909.374 SPOT 908.477 SPOT 909.179 Document Path: K:\020018-000\GIS\Maps\WR Map\Survey Map Date Saved: 6/16/2023¯ 1 inch = 80 feet 0 80 FeetAmelia Ditch Drainage Study City of Lino Lakes Survey Map 3 Parcels 918.131 906.756 Elevation SPOT MARSH FES Survey Point Page 26 6518 20TH AVE BURQUE, FRANCES GEORGE Parcel ID: 253122320001 BURQUE, FRANCES GEORGE Parcel ID: 253122330001 1926 BIRCH ST FARRELL PROPERTIES LLC Parcel ID: 263122410002 CTRL 912.274SPOT 912.472 SPOT 907.493 SPOT 909.179 SPOT 909.115 SPOT 907.5 SPOT 908.813 SPOT 907.077SPOT 907.431 SPOT 908.251 SPOT 907.495 SPOT 907.407 SPOT 907.09 SPOT 907.159 SPOT 908.492 SPOT 907.368 SPOT 908.461 SPOT 908.666 SPOT 907.478 SPOT 907.085 SPOT 907.452 SPOT 909.465 SPOT 908.39SPOT 908.311 SPOT 908.731 SPOT 909.046 SPOT 908.451 SPOT 908.015 SPOT 909.786 SPOT 908.658SPOT 907.971 SPOT 909.787 SPOT 909.118 SPOT 907.745SPOT 906.893 SPOT 908.989 SPOT 908.437 SPOT 907.094 SPOT 908.889 SPOT 908.828 SPOT 908.957SPOT 908.046 SPOT 908.755 SPOT 907.896 SPOT 902.879 FES 905.137 SPOT 902.868 SPOT 907.12 SPOT 906.224SPOT 907.674 Document Path: K:\020018-000\GIS\Maps\WR Map\Survey Map Date Saved: 6/16/2023¯ 1 inch = 80 feet 0 80 FeetAmelia Ditch Drainage Study City of Lino Lakes Survey Map 4 Parcels 918.131 906.756 Elevation SPOT MARSH FES Survey Point Page 27 6443 20TH AVE KRIEGLER, MICHAEL J Parcel ID: 263122440005 6483 20TH AVE KNABE JUDITH Parcel ID: 263122440003 1926 BIRCH ST FARRELL PROPERTIES LLC Parcel ID: 263122410002 SPOT 910.309 SPOT 909.843 FES 905.38 FES 905.265 SPOT 909.852 SPOT 907.31 SPOT 911.82 SPOT 911.222SPOT 906.789 SPOT 911.964 SPOT 909.786 SPOT 907.381 SPOT 912.201 SPOT 907.647 SPOT 908.136 SPOT 907.69 SPOT 907.239 SPOT 909.854 SPOT 907.395 SPOT 910.817 SPOT 909.194 SPOT 907.615 SPOT 905.322 SPOT 905.201 SPOT 906.991 SPOT 909.738 SPOT 908.255 SPOT 905.378 SPOT 905.073 SPOT 908.806 SPOT 907.597SPOT 905.856 SPOT 904.954 SPOT 905.243 SPOT 904.54 SPOT 916.214 SPOT 910.381 SPOT 906.408 SPOT 905.347 Document Path: K:\020018-000\GIS\Maps\WR Map\Survey Map Date Saved: 6/16/2023¯ 1 inch = 80 feet 0 80 FeetAmelia Ditch Drainage Study City of Lino Lakes Survey Map 5 Parcels 918.131 906.756 Elevation SPOT MARSH FES Survey Point Page 28 6443 20TH AVE KRIEGLER, MICHAEL J Parcel ID: 263122440005 6433 20TH AVE VESEL MATHEW P & MARY E Parcel ID: 263122440004 CARDINAL JR, ANDREW J Parcel ID: 353122120001 CARDINAL, JAMES G Parcel ID: 263122430001 FES 912.427 SPOT 910.229 FES 906.791 SPOT 913.563 SPOT 908.988 SPOT 907.193 SPOT 914.159 SPOT 907.498 SPOT 907.329 SPOT 907.616 SPOT 906.066 SPOT 908.019 SPOT 909.295 SPOT 906.24SPOT 906.364 SPOT 907.865 Document Path: K:\020018-000\GIS\Maps\WR Map\Survey Map Date Saved: 6/16/2023¯ 1 inch = 80 feet 0 80 FeetAmelia Ditch Drainage Study City of Lino Lakes Survey Map 6 Parcels 918.131 906.756 Elevation SPOT MARSH FES Survey Point Page 29 CARDINAL JR, ANDREW J Parcel ID: 353122120001 SPOT 911.642 SPOT 906.91 MARSH 907.73 MARSH 908.259 MARSH 908.185 MARSH 909.059 MARSH 909.73 MARSH 908.5 SPOT 910.638 SPOT 909.271 SPOT 912.108 SPOT 911.115 SPOT 908.923 SPOT 909.722 SPOT 911.033 SPOT 906.264 SPOT 907.142 SPOT 906.418 SPOT 907.919 SPOT 908.887 SPOT 907.552 SPOT 906.265 SPOT 904.819 SPOT 904.923 SPOT 905.326 SPOT 907.432 Document Path: K:\020018-000\GIS\Maps\WR Map\Survey Map Date Saved: 6/16/2023¯ 1 inch = 80 feet 0 80 FeetAmelia Ditch Drainage Study City of Lino Lakes Survey Map 7 Parcels 918.131 906.756 Elevation SPOT MARSH FES Survey Point Page 30 Amelia Ditch Study June 19, 2023 Page 31 1 – Culvert C Upstream Amelia Ditch Study June 19, 2023 Page 32 2 - North Main Branch Amelia Ditch Study June 19, 2023 Page 33 3 - North Side Branch Amelia Ditch Study June 19, 2023 Page 34 4 - North Vegetation Amelia Ditch Study June 19, 2023 Page 35 5 –Culvert C Downstream Amelia Ditch Study June 19, 2023 Page 36 6 – Submerged Downstream End of Culvert C Amelia Ditch Study June 19, 2023 Page 37 7 – Channel in 1926 Birch St Property Amelia Ditch Study June 19, 2023 Page 38 8 – Channel Upstream of Culvert D Amelia Ditch Study June 19, 2023 Page 39 9 –Upstream End of Culvert D Amelia Ditch Study June 19, 2023 Page 40 10 –Submerged Upstream End of Culvert D Amelia Ditch Study June 19, 2023 Page 41 11 – Channel Downstream of Culvert D Amelia Ditch Study June 19, 2023 Page 42 12 –Submerged Downstream End of Culvert D Amelia Ditch Study June 19, 2023 Page 43 13 – Looking West Down Tributary Side Ditch Amelia Ditch Study June 19, 2023 Page 44 14 – Property Fence South of Side Ditch Amelia Ditch Study June 19, 2023 Page 45 15 – Narrowing of Channel Near Side Ditch Amelia Ditch Study June 19, 2023 Page 46 16 – Side Ditch Delta Amelia Ditch Study June 19, 2023 Page 47 17 – Side Ditch Delta Amelia Ditch Study June 19, 2023 Page 48 18 – Looking East Down Tributary Side Ditch Amelia Ditch Study June 19, 2023 Page 49 19 – Channel in 6443 20th Ave Property Amelia Ditch Study June 19, 2023 Page 50 20 – Channel Debris in 6443 20th Ave Property Amelia Ditch Study June 19, 2023 Page 51 21 - Culvert E Upstream Pool Amelia Ditch Study June 19, 2023 Page 52 22 - Culvert E Downstream End Amelia Ditch Study June 19, 2023 Page 53 23 – Culvert E Downstream End Amelia Ditch Study June 19, 2023 Page 54 24 - Culvert E Downstream Channel Amelia Ditch Study June 19, 2023 Page 55 25 - 6433 20th Ave Bridge Upstream Channel Amelia Ditch Study June 19, 2023 Page 56 26 - 6433 20th Ave Bridge Downstream Channel Amelia Ditch Study June 19, 2023 Page 57 27 – Channel Debris in 1826 Birch St Property Amelia Ditch Study June 19, 2023 Page 58 28 – Culvert F Upstream Pool Amelia Ditch Study June 19, 2023 Page 59 29 – Culvert F Upstream Channel Amelia Ditch Study June 19, 2023 Page 60 30 – Culvert F Upstream Channel Amelia Ditch Study June 19, 2023 Page 61 31 – Culvert F Downstream End Amelia Ditch Study June 19, 2023 Page 62 32 – Culvert F Downstream Erosion Amelia Ditch Study June 19, 2023 Page 63 33 – Culvert F Heaving Amelia Ditch Study June 19, 2023 Page 64 34 – Culvert F Downstream Channel Debris Amelia Ditch Study June 19, 2023 Page 65 35 – Channel to Lake Amelia 1 ENVIRONMENTAL BOARD AGENDA ITEM 7A STAFF ORIGINATOR: Andy Nelson, Environmental Coordinator MEETING DATE: August 30th, 2023 REQUEST: Conditional Use Permit and Site Plan Review for Open and Outdoor Storage at 2300 Main Street APPLICANT: Steve Tomas Tomas Companies Inc./Glamos Wire, Inc. 2300 Main Street Lino Lakes, MN 55038 OWNER: Same. BACKGROUND The applicant, Steve Tomas with Tomas Companies Inc./Glamos Wire, Inc. has submitted a request for a Conditional Use Permit (CUP) and Site Plan Review for Open and Outdoor Storage at 2300 Main Street. The proposed project will require an amendment to an existing CUP for outdoor storage on the site that was approved by the City Council on July 12, 2021 (Resolution 21-69). The proposed plan includes construction of additional outdoor open storage space south of an existing storage area south of the factory. Tree removals for the project are associated with the proposed paved area and grading for a stormwater pond that will be constructed to manage the additional runoff. There are plans for tree preservation and landscaping to restore canopy and provide additional screening for the new storage area. This staff report is based on a review of the following documents: • Site Development Plans prepared by Bolton and Menk, dated 8-14-23. • Applicant’s Narrative prepared by Bolton and Menk, dated 8-14-23. • Certificate of Survey prepared by Bolton and Menk, dated 7-25-23. • Wetland Delineation Report prepared by Bolton and Menk, dated 4-25-23. • Notice of Decision 07-066, MN Wetland Conservation Act, Rice Creek Watershed District, dated 7-2-07. • Existing and Proposed Drainage Maps and Calculations prepared by Bolton and Menk, dated 8/01/23. 2 ANALYSIS General Site Characteristics A Conditional Use Permit for an outdoor storage area was approved for the parcel at 2300 Main Street in July of 2021. After completion of the project approved in the CUP, additional grading work was done to further expand the outdoor storage area. This work was not permitted by the original CUP. The proposed project will bring the site into compliance with City and Rice Creek Watershed District requirements. The submitted plans include construction of an additional 2.06 acres of open outdoor storage area, additional lighting, fencing, landscaping, and stormwater management system. Land Cover Pre-settlement land cover (Marschner) was Big Woods (oak, maple, basswood, hickory) and oak openings and barrens, a fire-dependent savanna dominated by oaks with an understory of forbs and grasses. Current land cover (Minnesota Land Cover Classification System) on the site is medium- tall grassland. The tree survey identified mostly Eastern cottonwoods and boxelders in the natural area. Species planted on the developed portion of the parcel include primarily green ash, blue spruce, American linden, and hackberry. Rare, Unique, or Significant Resources Blanding’s turtle (Emydoidea blandingii) has been observed within a one-mile radius of the site. The MN DNR flyer and factsheet on this turtle must be provided to all contractors working on the site. Any sightings of this species should be reported to City staff so that the turtles can be safely relocated. The project site is within a mile of, and drains to, Clearwater Creek, which is an impaired water. This will impact timelines on soil stabilization and is noted in the Stormwater Pollution Prevention Plan. 3 Soils The Natural Resource Conservation Service Web Soil Survey notes the following soil types on the project site: Glencoe loam: Hydrologic group B/D, very poorly drained, hydric. Nessel fine sandy loam: Hydrologic group B, moderately well drained, not hydric. Webster loam: Hydrologic group B/D, poorly drained, hydric. Hayden fine sandy loam: Hydrologic group B, well drained, not hydric. Nowen sandy loam: Hydrologic group B/D, poorly drained, hydric. The majority of the project area has poorly drained soils with high clay content. Due to the high clay content and the site’s inclusion in the Drinking Water Supply Management Area, infiltration of stormwater is not feasible. Stormwater Management A stormwater management plan has been submitted and is being reviewed by the City Engineer. The following summary review is based upon the existing and proposed drainage figures and calculations, and the written stormwater management narrative included with the Stormwater Pollution Prevention Plan (SWPPP). Existing Conditions Stormwater on the site currently sheet flows from grass areas and parking lots to filter basins in the south of the site. From there the water heads into the City storm sewer system near Otter Lake Road before heading to a regional stormwater pond south of the site. Proposed Conditions Under the proposed conditions, there will be 2.06 acres of new impervious surface. A wet sedimentation pond will be constructed south of the proposed storage area to accommodate stormwater runoff that will sheet flow from the additional impervious surface. A drainage swale running along the south of the existing storage area will carry water from the existing storage area west to the new pond. The pond will also be sized to accommodate water that was managed by a raingarden that was filled in during the unpermitted grading activity. Overflow from the pond will be routed to the City storm sewer system near Otter Lake Road before heading to the regional stormwater pond south of the site. 4 Infiltration was deemed infeasible on the site due to high clay content of the soils ranging from 15-20 feet deep. The peak runoff rates from the impervious areas under proposed conditions will be lower than under existing conditions for the 2-, 10-, and 100- year storm events as required by Rice Creek Watershed District rules. Stormwater Pollution Prevention The Sediment and Erosion Control Plan details locations for installation of BMPs including a rock construction exit (with geotextile fabric beneath the rock), rip rap for energy dissipation at two curb cuts abutting the stormwater basin, biologs for ditch checks in the swale, and silt fence for perimeter control. A concrete washout area is also noted on the plans. There is an existing soil berm that runs along the south and east perimeters of the proposed pavement area. This berm will serve as sediment control for those perimeters. Notes indicating that erosion blanket used must be a natural net variety must be added to the plan set. Specific sheets to include this note are in the recommendations. Because this site drains to an impaired water, Clearwater Creek, the stabilization timeline is 7 calendar days from construction ceasing. Construction SWPPP Manager contact information and training details must be added to the SWPPP prior to construction activity on the site. Flood Plain Site does not fall within the flood management zone. Shoreland District Site does not fall within the Shoreland District. Wetlands A 0.81 acre area of wetland was delineated within the parcel boundaries. This shallow marsh and seasonally flooded fringe are located on the southeast corner of the parcel. Two additional wetlands just south of the proposed outdoor storage area were deemed incidental by Rice Creek Watershed District in 2007. Impacts to these wetlands will not require mitigation. No additional wetland impacts that would require mitigation are proposed for this project. 5 Alternative Urban Areawide Review (AUAR) Considerations The site is within the 2005 I-35E Corridor AUAR environmental review boundary. The AUAR identified this site as industrial in the land use scenarios. The outdoor storage project is consistent with industrial development. No further environmental assessment is required. Drinking Water Protection The site is within the Drinking Water Supply Management Area (DWSMA) and ranges from moderately to highly vulnerable. No stormwater infiltration is proposed on the site. LANDSCAPE PLAN Tree Preservation and Mitigation Standards The purpose of these standards is to protect valuable trees and stands of vegetation while not interfering with landowners’ reasonable use and development of property. The goal is to minimize unnecessary loss of habitat, biodiversity, and forest resources and to replace removed trees in areas where tree cover is most critical. A tree survey was performed that identified: Of the 210 trees surveyed, 92 will be removed. 61 of these trees are in the Basic Use Area (within the outdoor storage area or within 20 feet of it). 31 of the tree removals that are located near the proposed stormwater basin will require mitigation trees to be planted. 32 mitigation trees are required because one of the trees is large enough to require two trees planted in its place. There are 18 trees that will be preserved near the disturbance area. These trees will provide 43 trees worth of existing tree credit. There are numerous ash trees on the site that have been infested with Emerald ash borer. The following emerald ash borer infested trees must be removed: • 11 trees along Otter Lake Road east of the sidewalk. • Trees 208-215 in the northeast corner of the property. These trees have the potential to impact public safety and cause off-site property damage. Total Trees Surveyed 210 Total Trees Removed 92 Trees Removed in Basic Use Area 61 Mitigation Trees Required 32 6 All other ash trees on the site that have not been treated to prevent emerald ash borer infestation should be removed as well, but their removal will not be a requirement of this project. Open Areas Landscape Standards The purpose of these standards is to provide general site beautification and high aesthetic quality with a mix of plant materials in open areas. Open area landscape standards call for 1 large tree and 2 large shrubs per 2500 sf. Required for 32,000 square feet of open space: 13 large trees 26 large shrubs Provided: 75 large trees 0 large shrubs Existing trees that will be preserved southwest of the proposed storage area provide 43 trees worth of credit. There are also 32 new trees planned for the open space area. 75 total large trees were provided. One large tree can be substituted for 2 large shrubs. There are enough large trees provided to also meet the large shrub requirement. Open Areas Landscape Standards have been met. Buffer and Screen Standards The purpose of this requirement is to separate and buffer different land use types, screen roads and parking, and screen utility and loading areas. Continuous, year-round planting screens require, at the minimum, a double row of plants with triangulated spacing. Outdoor storage yards require a 10 foot high screen, though the City Council may approve a modification or waiver from these standards if the affected lot line adjoins another industrial property. The current plan set includes inconsistent information about the height and materials for the proposed fence. The fence plan submitted should be consistent across all plan sheets. The west perimeter of the storage area abuts Otter Lake Road and will require a 10 foot opaque fence (ex: vinyl) with shrub cover for 50 percent of the wall. The shrub cover required for the west section of fence has not been provided. 7 Additionally, trees are required along the length of the screen at intervals determined by size (large trees every 50 linear feet, medium trees every 35 linear feet, or small trees every 25 linear feet). Between the existing trees that will be preserved and the new trees planned for the west perimeter, the tree requirement for the west fence perimeter is met. The south and east perimeters of the storage area abut industrial properties. For these perimeters, staff is recommending 8 foot high vinyl fencing to match the existing fence on the storage area to the north. Trees planted along the south perimeter will meet tree and shrub requirements for the south perimeter fence. The east perimeter fence should not require additional shrubs or trees due to screening provided by the berm that abuts the property line. Buffer and screen requirements have not been met. Canopy Cover Canopy cover standards do not apply to permitted outdoor storage areas in Industrial Districts. Sod and Ground Cover Standards All areas not otherwise improved in accordance with the approved site plans shall have a minimum depth of 4 inches of topsoil and be sodded including boulevard areas. Seed may be provided in lieu of sod in certain cases, including when the area is adjacent to natural areas or wetlands. All disturbed areas outside of the paved areas will receive 6” of topsoil and bee seeded with MN DOT seed mix 35-241, a mesic prairie seed mix. The unpermitted grading that created the berm running along the south and east perimeters of the proposed storage area would have resulted in exposed soil. Exposed soil is prone to colonization by invasive, weedy plant species. A vegetation management plan will be required for the berm and any additional exposed soil around it that will not be paved for the storage area. This must include a vegetation assessment that identifies the plant species present. Depending on the results of the assessment, a plan to prepare the site for native seeding may also be required. Lighting The purpose of the lighting requirements in the Zoning Code is to reduce light pollution, promote energy conservation, and increase night time safety, utility, security, and productivity. Lighting is reviewed by the City Planner. Per Section 1007.043(6)(d), no light source shall exceed 1.0 foot candle onto right of way or 0.4 foot candle onto adjacent property. 8 Light fixtures are down lit and cutoff as required by city code. Lighting appears to meet requirements. RECOMMENDATIONS Staff recommends that the Conditional Use Permit and Site Plan Review for 2300 Main Street be forwarded to the Planning and Zoning Board and City Council with the following comments: 1. The following emerald ash borer infested trees must be removed: • 11 trees along Otter Lake Road east of the sidewalk. • Trees 208-215 in the northeast corner of the property. These trees have the potential to impact public safety and cause off-site property damage. All other ash trees on the site that have not been treated to prevent emerald ash borer infestation should be removed as well. 2. Blanding’s turtle (Emydoidea blandingii) has been observed within a one-mile radius of the site. The MN DNR flyer and factsheet on this turtle must be provided to all contractors working on the site. Any sightings of this species should be reported to City staff so that the turtles can be safely relocated. 3. A vegetation management plan will be required for the berm and any additional exposed soil resulting from the unpermitted grading activities. This will include a vegetation assessment that identifies the plant species currently present. Depending on the results of the assessment, a plan to prepare the site for native seeding may also be required. 4. Erosion blanket must be a natural net variety. A note stating this should be added to the Sediment and Erosion Control Plan (Sheet C2.01), the Erosion Control Blanket Detail (Sheet C4.01), and the BMP Quantity Summary (Sheet C2.02). 5. Additional shrubs will be required to cover 50% of the west perimeter fence that faces Otter Lake Road. 6. The provided Tree Protection Detail must be replaced with the City Tree Protection Fence Detail on Sheet L2.01. All trees planned for preservation will require tree protection fence to be installed in accordance with this detail. Also, the Tree Protection Zones (TPZs) must be shown on the Grading, Drainage, and Erosion Control Plan (Sheet C3.01). The TPZs must be in place prior to issuance of grading permit and will be reviewed by staff concurrently with inspection of sediment and erosion control measures. 9 ATTACHMENTS 1. Aerial Photo 2. Certificate of Survey 3. Site Plan (Sheet C1.01) 4. Sediment and Erosion Control Plan (Sheet C2.01) 5. Grading and Drainage Plan (Sheet C3.01) 6. Significant Tree Table (Sheet L1.01) 7. Tree Preservation Plan (Sheet L1.03) 8. Landscape Plan (Sheet L1.04) 70th St Phelps Rd 14 84 Rosemary Way N ElmcrestAveN14 Legend Parcels City Mask August 25, 2023 Map Powered By Datafi ± 1 in = 400 Ft 2300 Main Street XXXXXXXXXXXXXXXXX X X X OTTER LAKE ROAD CLVT CLVT CLVTS 00°06'05" E 1269.15 S 88°22'05" W 645.68N 00°52'47" W 1275.33N 88°55'54" E 662.87S160.1 159.6 79.9 39.9 39.9 79.9 240.3439.639.478.2163.718.919.0119.1>>>>>>>>D50.0'MAIN ST.90991 0 9 1 5 9 1 4 91 3 91 191291391 4 910 915916914913910915 920920 915914913912911 915915916 916915 914ll l l l l l l l 3507 HIGH POINT DRIVE NORTH BUILDING 1 - SUITE E130 OAKDALE, MN 55128 (651) 704-9970 R SCALE IN FEET 0 100 H:\TOMASCOM_PR\0T7129812\CAD\C3D\129812_V_BASE_E1.dwg 7/25/2023 5:21 PM ©Bolton & Menk, Inc. 2023, All Rights Reserved JOB NUMBER:FIELD BOOK:DRAWN BY: FOR: R CERTIFICATE OF SURVEY 2300 MAIN STREET, LINO LAKES, MN PART OF: W 1/2 OF SE 1/4 OF NE 1/4 SEC. 24, TWP. 31, RNG. 22 ANOKA COUNTY, MN TOMAS COMPANIES, INC. ARK LOT AREA: 832,279 SQ. FT. ALL BOUNDARIES AND AREA ARE ACCORDING TO THE E.G. RUD & SONS INC. ALTA SURVEY (DOCUMENT 4) PROPERTY INFORMATION AS SHOWN BASED ON ALTA SURVEY PREPARED BY E.G. RUD AND SONS, INC. DATED 7/02/2020. STREET FRONTAGE: 1269.15 FEET, BASED ON THE WEST BOUNDARY OF THE PROPERTY DATUMS: VERTICAL - NAVD88 HORIZONTAL - AMOKA COUNTY COORDINATE SYSTEM BENCHMARK: MNDOT MONUMENT GSID STATION NO. 92399 "0282 S" ELEVATION = 931.46 NAVD88 LEGAL DESCRIPTION FROM E.G. RUD AND SONS INC. ALTA SURVEY (DOCUMENT 4): "That part of the West Half of the Southeast Quarter of the Northeast Quarter of Section 24, Township 31, Range 22, lying East of a line described as follows: Beginning at the Southeast corner of said West half of Southeast Quarter of Northeast Quarter; thence Northerly to a point on the North line of said West Half of Southeast Quarter of Northeast Quarter distant 20 feet West from the Northeast corner of said West Half of the Southeast Quarter of the Northeast Quarter and there terminating, Except Parcel 10, Anoka County Highway Right-of-Way Plat No. 65, according to the map or plat thereof on file and of record in the office of Anoka County Recorder. NOTES:SOUTH LINE OF SE 1/4 OF NE 1/4 OF SEC 24STREET UTILITY EASEMENT PER DOC. NO. 1308846 NORTH LINE OF SE 1/4 OF NE 1/4 OF SEC 24E LINE OF THE W 1/2 OF THE SE 1/4 OF THE NE 1/4 OF SEC 24 EDGE OF WATER (LOCATED: 4/22/23) DELINEATED WETLAND BOUNDARY BUILDING CORNER LIES 1.3' (PER ALTA SURVEY BY RUD) BUILDING LINEAR FOOTAGE AND LOCATION BASED ON E.G. RUD & SONS INC. ALTA (DOCUMENT 4) WEST LINE OF THE SE 1/4 OF THE NE 1/4 OF SEC 24 TRAIL, DRAINAGE, AND UTILITY EASEMENT PER DOC. NO. 1976889.002 8.0 55.0 SURVEYOR'S CERTIFICATION I hereby certify that this survey, plan, or report was prepared by me or under my direct supervision and that I am a duly Licensed Land Surveyor under the laws of the State of Minnesota. __________ Date _______________________________ Ron P. Alwin License Number 17765 7/25/2023 VINYL FENCE MINOR CONTOURS MAJOR CONTOURS STORM SEWER>> l WATER SYSTEM X X FENCE 1 ENVIRONMENTAL BOARD AGENDA ITEM 7B STAFF ORIGINATOR: Andy Nelson, Environmental Coordinator Claire Knopf, Community Development Intern MEETING DATE: August 30, 2023 REQUEST: Amendment to Zoning Ordinance Regarding Managed Natural Landscapes APPLICANT: City of Lino Lakes OWNER: N/A BACKGROUND: Effective July 1, 2023, Minnesota Statutes, section 412.925, mandates that cities allow for managed natural and native landscaping on all parcels. In response, the City is amending its local code and ordinances to conform with the statute. The statute states the following: Minn. Stat. § 412.925 – NATIVE LANDSCAPES (a) A statutory city or home rule charter city shall allow an owner, authorized agent, or authorized occupant of any privately owned lands or premises to install and maintain a managed natural landscape. For purposes of this section, the following terms have the meanings given: (1) "managed natural landscape" means a planned, intentional, and maintained planting of native or nonnative grasses, wildflowers, forbs, ferns, shrubs, or trees, including but not limited to rain gardens, meadow vegetation, and ornamental plants. Managed natural landscapes does not include turf-grass lawns left unattended for the purpose of returning to a natural state; (2) "meadow vegetation" means grasses and flowering broad-leaf plants that are native to, or adapted to, the state of Minnesota, and that are commonly found in meadow and prairie plant communities, not including noxious weeds. "Noxious weed" has the meaning given in section 18.77, subdivision 8; (3) "ornamental plants" means grasses, perennials, annuals, and groundcovers purposely planted for aesthetic reasons; 2 (4) "rain garden" means a native plant garden that is designed not only to aesthetically improve properties, but also to reduce the amount of stormwater and accompanying pollutants from entering streams, lakes, and rivers; and (5) "turf-grass lawn" means a lawn composed mostly of grasses commonly used in regularly cut lawns or play areas, including but not limited to bluegrass, fescue, and ryegrass blends, intended to be maintained at a height of no more than eight inches. (b) Managed natural landscapes may include plants and grasses that are in excess of eight inches in height and have gone to seed, but may not include any noxious weeds and must be maintained. (c) Except as part of a managed natural landscape as defined in this section, any weeds or grasses growing upon any lot or parcel of land in a city to a greater height than eight inches or that have gone or are about to go to seed are prohibited. Chapter 904 of the City Code, along with Chapter 1007.043 (Zoning Ordinance) currently establishes requirements for natural prairie restoration areas. The new statute is of broader scope than our current language and the City Attorney has recommended amendment to reference the statutory language. The language within the zoning ordinance will be amended through a separate process. ENVIRONMENTAL DIRECTION: Staff is recommending approval of Ordinance No. 10-23. ATTACHMENTS: 1. Ordinance No. 10-23 1st Reading: Publication: 2nd Reading: Effective: CITY OF LINO LAKES ORDINANCE NO. 10 -23 ORDINANCE AMENDING CITY CODE CHAPTER 904: WEEDS AND GRASS DECLARED TO BE A NUISANCE The City Council of Lino Lakes ordains: Section 1. That Section 904.08 (2) of the Lino Lakes Code of Ordinances related to Weeds and Grass is hereby amended as follows: (2) Natural prairie restoration areas Native grasses indigenous to Minnesota, planted and maintained on any occupied lot or parcel of land, setback a minimum of 20 feet from the front property line as part of a garden or landscape treatment; Managed Natural Landscapes as defined in Minnesota Statutes 412.925(a)(1)-(5). Section 2. Effective Date. This Ordinance shall be in full force and effect from and after its passage and publication according to law. Adopted by the Lino Lakes City Council this 25th day of September, 2023. BY: ____________________________ Rob Rafferty, Mayor ATTEST: ________________________ Jolleen Chaika, City Clerk 1 ENVIRONMENTAL BOARD AGENDA ITEM 7C STAFF ORIGINATOR: Andy Nelson MEETING DATE: August 30th, 2023 REQUEST: Artificial Turf Ordinance Amendment TOPIC: Artificial Turf Ordinance Amendment BACKGROUND On August 10, 2023 a crew performing landscaping work at 75 Robinson Drive had removed turf grass and soil and added rock in preparation for installation of synthetic turf that would cover a large portion of the lot. A stop work order was issued for the site at that time due to the violation of City Code requirements. Currently, the zoning ordinance requires sod or seed as ground cover as stated in the following excerpts from City Code: Section 1007.043(17)(h) Sod and Ground Cover: All areas not otherwise improved in compliance with the approved site plans shall have a minimum depth of four (4) inches of topsoil and be sodded including boulevard areas. Section 1007.043(17)(i) General Landscaping Standards: 1. All lot areas not used for off-street parking, off-street loading, sidewalks, driveways, building sites, or other requirements shall be landscaped with grass, shrubs, trees or other acceptable vegetation, or treatment as required by this chapter prior to issuance of a certificate of occupancy. Exceptions to these requirements are limited to seeding, undisturbed natural vegetation areas, natural prairie restoration areas and bark, wood chips, and decorative rocks in support of shrubs and foundation plantings. There is no exception for synthetic turf. Troy Johnson, with ForeverLawn Minnesota, Inc. submitted a Land Use Application on August 16th, 2023 requesting an amendment to City Code allowing synthetic turfgrass. An amendment to the Code would require City Council approval. 2 ANALYSIS Staff is not aware of any cities that have amended their ordinances to allow this product. Potential benefits of synthetic turf: • No water required for irrigation • No pesticides, herbicides, or fertilizers are needed • Less fuel emissions from lawn equipment • Product is made from plastic bottles and “technology created from soybean plants” Areas of concern: • Staff is not aware of any cities in the area that have amended their ordinances to allow this product. • Hazardous products are released if the product catches fire. • Permeability of synthetic turf may be an issue. Even if the product is 100% permeable, this doesn’t take into account the permeability of the underlying soil. • Evapotranspiration has a cooling effect. Water uptake by plants also contributes to stormwater management. • The product may contribute byproducts to surface and groundwater supplies as it decomposes. The polyurethane and polyurethane that it is made of has hazardous decomposition products. • Use in easement areas and rights-of-way should be prohibited. These areas require access for maintenance of utilities and management of stormwater systems and are frequently disturbed. • Examples of installations provided were for small portions of yards, not whole yards. • Expected life span of the product is 15-20 years. At that time, the material must be removed and landfilled. Staff does not support widespread use of this material. Staff recommends that use of synthetic turf, if approved through an ordinance amendment, be limited to small portions of yards and certain applications. For example, patios, playgrounds, and other small areas. Also, the locations allowed should be clearly specified in such a way that no off-site impacts to stormwater management will occur. ENVIRONMENTAL DIRECTION Vote required: Simple majority. ATTACHMENTS 1. Aerial Photo 2. Site Photo 3. Landscape System Drawing 3 4. Applicant’s Proposed Ordinance 5. Letter from Forever Lawn Robinson Dr Robins on Dr Legend Address Labels Parcels August 24, 2023 Map Powered By Datafi ± 1 in = 25 Ft 75 Robinson Drive