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Item 5.5 & 5.6 • Item # 5.5. & 5.6. oty ikZ -�-, River MEMORANDUM TO: Planning Commission FROM: Scott Harlicker, Senior Plann DATE: May 27, 2003 SUBJECT: Case No.'s ZC 03-03, P 03-04, Request by S & Z Investments, Inc. for Rezoning and Preliminary Plat Approval —West Oaks Request • Consider a request by S&Z Investments for the following: • Rezoning from R1c (Single Family Residential)to R3 (Townhouse District) • Preliminary plat of West Oaks 120-Day Rule To comply with the 120-day rule,without an extension,this item needs action by August 26, 2003. Location The property is located south of Highway 10,west of Waco Street and north of Pinewood Golf Course. Zoning/Land Use Ric (Single Family Residential) /MR(Medium Density Residential) Attachments • • Location map • Preliminary plat Memo to Pluming Commission/ZC 03-03,P 03-04 May 27,2003 Page 2 • • Development plans • Memo from the City Engineer • Memo from Rebecca Haug, Environmental Technician Overview S&Z Investments is proposing to develop 38.18 acres into a 137 unit townhouse and single family residential development with one 3.68 acre outlot.There are 15 single family lots and 122 townhouse lots proposed.The property is bounded by Pinewood Golf Course on the south, Big Lake Township to the west,undeveloped property to the north and Waco Street on the east.The site is a mix of open fields adjacent to the golf course on the south 1/5 of the site.The remaining area is a mix of wetlands and woodlands.Approximately 5 acres is wetland, about 3 acres is open area and the remaining 30 acres is woodlands. There are no existing structures on the property. The properties to the west in Big Lake Township are rural single family lots with wells and septic systems. The 10 acres to the north is currently vacant;however;the owner of the property has presented concept plans to staff for a townhouse development. There are 2 single family lots and a fairway for Pinewood Golf Course to the south.There are also a 2 single family lots abutting the project on the east.One is a l/ acre lot,the other is a 4.5 acre lot. The site is within the Urban Service District and will be connected to municipal water and • sewer. Analysis Rezoning Request The applicant is requesting a rezoning from Ric (Single Family Residential)to R3 (Townhome District).The underlying land use designation of this property is Medium Density Residential,which allows for up to 7.92 units per acre.The net density(the total area less public street right-of-ways,wetlands,water bodies and slopes steeper than 3:1) is 6 units per acre,which would be consistent with the underlying land use designation of Medium Density Residential. Preliminary Plat Density There are 137 lots proposed in this development.The density in the R3 zoning district is based on net developable acres (the total area less public street right-of-ways,wetlands, waterbodies and slopes steeper than 3:1).The density of this project is 6 units per acre.The maximum density allowed in the R3 Zoning District is 8 units per acre. • S:\PLANNING\Case Files\2003\P 03-04 West Oaks\pc memo 5-27.doc Memo to Planning Commission/ZC 03-03,P 03-04 May 27,2003 Page 3 • Layout Streets The project will have a mix of private drives and public streets. The main streets through the project, 183rd Avenue,Yankton Street and Xerxes Street will be public. The dead end drives will be private.The private drives are proposed to be 20 feet wide; on street parking will not be allowed on the private drives.The drives will be owned and maintained by the homeowners association. The private drive located in the southeast corner of the project has more units on it than what the ordinance allows.The R3 District allows up to 12 units on a private dead end street;the plat has 18 units on this street.The original plat had this street as a public cul de sac,which would allow for the 18 units. The street was changed to a private street so that additional trees could be preserved and a wider buffer provided around the wetland. Staff is recommending that the Commission approve the additional 6 units on this private drive. The main access into the project is from Waco Street.The southerly east-west street, 183rd Avenue will be extended through the plat to connect Waco street with 183rd Avenue in Big Lake Township.Yankton Street will be constructed to the north boundary of the plat to allow for future extension to the property to the north.The private drives will provide access to most of the townhouse units. • Lots Single Family The 15 single family lots are located along the south side of 183rd Avenue and abut the Pinewoods Golf Course. The lots comply with the minimum lot size requirements of the R3 Zoning District.Thirteen of the fifteen lots are 12,000 sf. in size;the remaining two are 18,000 sf. and 15,000 sf. Townhomes The majority of the lots in this project are townhouse. The applicant is proposing 122 townhouse lots.Most of these lots will be located with access from private drives.All of the lots will have shared driveways.The lots comply with the dimensional requirements of the R3 Zoning District. The applicant has not decided on the final designs of the townhouses.Townhouses are a permitted use in the R3 district subject to compliance with the R3 design standards. The final designs will be reviewed by staff for to ensure that they comply with the R3 design standards. Parking • S:\PLANNING\Case Files\2003\P 03-04 West Oaks\pc memo 5-27.doc Memo to Planning Commission/ZC 03-03,P 03-04 May 27,2003 Page 4 Adequate off street parking will be provided on each lot to meet the parking requirements. • The parking requirements for townhouses are 1 space for each bedroom for residents and 'h space per unit for guests. With 2 car garages and room for two vehicles in the driveway,the minimum parking requirements are met. Natural Features Wetlands There are about 5 acres of wetland on the site.They are linear and run diagonally across the northwest corner and across the central portion of the site. Some filling of the wetlands will be required for road construction.The applicant has met with the Technical Panel on wetland mitigation.A memo regarding their recommendation is attached. The wetlands will provide a nice amenity for the project and will provide open space behind and between many of the townhouse units. Tree Preservation Most of the site is wooded. Since most of the site will be graded,most of the trees will be removed. Trees will be preserved around the wetlands and in the wetland buffer areas as well as around the perimeter of the property. Some trees will also be preserved in the center of the loop. Park and Recreation The applicant is meeting the park dedication requirements with a mix of cash and land dedication.A 2.27-acre park is proposed in the southwesterly corner of the plat, providing a buffer between the large lot single family development in Big Lake Township and the proposed West Oaks Development. Of the 2.27 acres, .36 acres is identified at wetland. As it is the City's policy to provide no credit for areas within wetlands or easements,the total area eligible for dedication is 1.91 acres. Typically,the City requires 10 percent land dedication, 100% cash dedication, or a combination thereof. Ten percent of the area proposed to be developed is 3.45 acres (34.47 acres x 10%). The remainder of the park dedication requirements will be cash. Grading,Drainage and Utilities Grading, drainage and utility issues are addressed in the City Engineer's memo. Landscaping The number of trees on the proposed landscape plan complies with the landscape ordinance. However,there are trees proposed on the single family lots that are close to the house pads or in the rear of the lots. These trees should be located in the front yards away from the proposed house pads. • S:\PLANNING\Cue Files\2003\P 03-04 West Oaks\pc memo 5-27.doc Memo to Planning Commission/ZC 03-03,P 03-04 May 27,2003 Page 5 411 Recommendation Staff recommends that the Planning Commission recommend approval of the proposed zone change to R3 based on the following findings: • The request is consistent with the land use plan • The request will not adversely affect adjacent properties or land uses. • The request provides an opportunity for several different housing types. Staff recommends that the Planning Commission recommend approval of the preliminary plat with the following conditions: 1. A DEVELOPERS AGREEMENT BE PREPARED AND EXECUTED OUTLINING THE TERMS AND CONDITIONS OF THE PLAT APPROVAL PRIOR TO RELEASING THE PLAT FOR RECORDING. 2. THE DEVELOPER PROVIDES HOMEOWNER ASSOCIATION DOCUMENTS FOR THE CITY ATTORNEY'S REVIEW AND APPROVAL PRIOR TO FINAL PLAT. 3. SURFACE WATER MANAGEMENT FEE BE PAID IN THE AMOUNT REQUIRED BY THE CITY AT THE TIME OF FINAL PLAT PRIOR TO RELEASING THE PLAT FOR RECORDING. 4. PARK AND RECREATION FEE IN THE AMOUNT REQUIRED BY THE CITY AT THE TIME OF FINAL PLAT BE PAID PRIOR TO RELEASING THE PLAT FOR RECORDING. • 5. THE LETTER OF CREDIT SHALL COVER WETLAND MITIGATION. DRAINAGE EASEMENTS SHALL BE IN PLACE OVER THE WETLAND AND THE WETLAND MITIGATION AREAS. 6. RESTRICTIVE COVENANTS SHALL BE RECORDED ON THE WETLAND AND THE WETLAND MITIGATION AREAS. 7. A ONE YEAR MONITORING REPORT ON THE WETLAND MITIGATION IS REQUIRED. 8. THE CITY ENGINEER'S COMMENTS BE INCORPORATED INTO THE PLANS. 9. STREET LIGHTS BE INSTALLED AS REQUIRED BY ELK RIVER UTILITIES 10. A LETTER OF CREDIT BE PROVIDED TO THE CITY IN THE AMOUNT OF 100%OF THE COSTS OF THE PUBLIC IMPROVEMENTS. 11. UPON COMPLETING ALL OF THE IMPROVEMENTS AND HAVING THEM ACCEPTED BY THE CITY, A WARRANTY BOND IN THE AMOUNT OF 25%OF THE IMPROVEMENT COSTS SHALL BE SUBMITTED TO THE CITY FOR THE PERIOD OF ONE YEAR. 12. A SEALCOAT FEE IN THE AMOUNT TO BE DETERMINED BY THE CITY ENGINEER BE PAID PRIOR TO RELEASING THE PLAT FOR RECORDING. 13. A GRADING AND EROSION CONTROL PLAN BE APPROVED BY THE CITY ENGINEER PRIOR TO THE ISSUANCE OF BUILDING PERMITS. • S:\PLANNING\Case Files\2003\P 03-04 West Oaks\pc memo 5-27.doc Memo to Planning Commission/ZC 03-03,P 03-04 May 27,2003 Page 6 • 14. A DEVELOPMENT PLAN BE APPROVED BY THE CITY ENGINEER PRIOR TO THE ISSUANCE OF BUILDING PERMITS. 15. ALL GRADING BE CERTIFIED PRIOR TO THE ISSUANCE OF BUILDING PERMITS. 16. ALL MAILBOXES BE CLUSTERED. 17. A TREE PRESERVATION PLAN BE APPROVED PRIOR TO RELEASING THE PLAT FOR RECORDING. 18. ANY TREES OFF SITE OR ON SITE, NEAR THE LIMIT OF GRADING THAT ARE TO BE PRESERVED, SHALL BE FENCED WITH A SNOW FENCE AT THE DRIP LINE TO PREVENT GRADING, COMPACTION, OR STORAGE OF EQUIPMENT, DEBRIS OR MATERIALS. STAFF SHALL INSPECT FENCING PRIOR TO GRADING COMMENCING. 19. WATER ACCESSIBILTY FEES IN THE AMOUNT DETERMINED BY THE CITY BE PAID PRIOR TO RELEASING THE PLAT FOR RECORDING. 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' I i • i •• 0 ki 3 1 li Z Fr.r,i-1 411 .1 1 , - / isi;5ic i _ Iri 1, i -11Fiql i Al ,! ,.. , . 1111:1 lillil Lk -Pg i ill - 0- .. 1 ir i I& A ti 11 . 1,4 l' Wei i ill ii. Ili rr g P , i 'it'll, 1 II 11., 11 1111$1 1 I I- i 1 kg 'H Im i N. Agone 1 i Pr N .1 i 4 Lp g'WEST OAKS (J, \ A CITY OF ELK RIVER.MN S&Z INVESTMENTS.INC DETAIL SHEET 000:XT,T.IPS—A=0- .I.C.. n,..n___.. . ..,....... IrAnt=•?...s.MMV.:" "." .... nu._laanam • red- .A1d Howarc R. Green Company May 21, 2003 File: 812970J01-0240 Mr. Scott Harlicker Senior Planner City of Elk River 13065 Orono Parkway Elk River, MN 55330 RE: WEST OAKS ADDITION Dear Mr. Harlicker: As requested, we have reviewed the revised submittal for the West Oaks Addition. As you are aware, this is the subdivision west of Waco Street, north of Pine Wood Golf Course and abutting Big Lake Township. The proposal is for 15 single-family residential lots abutting the Pine Wood neighborhood and 122 multi-family units over the remainder of the property. The property is just over 38 acres in size. Based on our review, comments received at the staff review meeting and a meeting with the developer, we would offer the following comments: • A. Grading, Wetland Mitigation, and Erosion Control Plan • This project had previously received approval from the Technical Evaluation Panel (TEP) regarding wetland filling for road purposes. Because the site plan has been revised slightly, the project was revisited by the TEP. The revised plan fills slightly less wetland area than the previously approved plan by the TEP. Therefore, the TEP approved the revised plan. • This project will need an NPDES permit from the City of Elk River prior to any construction activities on the grading of the site. The site may need slightly more silt fence around the wetlands and near Waco Street. Also, the site should be required to install silt fence after the detention pond construction is complete. This will protect the newly constructed detention ponds from erosion due to house construction while turf is being established on the pond slopes. • There are some driveways on 184th Circle near Xerxes that exceed the City's ordinance of 10 percent slope. The two buildings closest to Xerxes Street should be reviewed and lowered to reduce the driveway slope. • We have reviewed the drainage calculations submitted for the revised development plan. Generally, the concept of the drainage is acceptable; however, there are still some minor changes and/or revisions that need to be made to the drainage calculations before they are approvable. They would include the following: ➢ The ponding area and storage volume used for Structure#5 seems to vary a minor amount, actually increasing in the Post-Developed conditions. Given the roadway • crossings as fill placement, how is the increase in storage area obtained? Ltr-051903-Harlicker 1326 Energy Park Drive • St. Paul, MN 55108 • 651/644-4389 fax 651/644-9446 toll free 888/368-4389 • Mr. Harlicker May 21, 2003 Page Two ➢ The drainage area of Structure #1 is approximately 253 acres. The hydrologic factor provided for the area is represented by the NRCS methodology and is provided with a Curve Number(CN) of 49 and a Time of Concentration of approximately 2.07 hours. Since the ponding limits downstream of this area are primarily influenced by this drainage area size, is the long term land-use of this 253 acres designated to remain the same? ➢ It appears that the Time of Concentration shown on your Curve Number calculation sheets is not the same as the number used in TR-20 for areas Pre-8 and Post-8. The number used in TR-20 appears to be the more suitable Tc for area 8. This will not affect the calculations if the number used in the program is the correct number. ➢ The Structure#5 ponding area appears to include area Post 31 in the ponding calculations of the Post-developed conditions. The street and planned culverts for the crossing of the ponding area shall have sufficient capacity to convey flows to maintain fairly equal pond levees on each side of the street. ➢ The 100-yr. HWL for Post 33 (888.50) does not meet the required 1.0 feet of freeboard to the low point on Xerxes St. NW (888.86) > The existing 100-year elevation of area Post 2 is listed as 888.6. Please submit the calculations used to determine this elevation. • > The total off-site discharge for the proposed conditions is greater than the total off- site discharge of the existing conditions. Any excess discharge must be detained on-site. > Storm sewer calculations should be submitted during the final design phase. The preliminary layout appears to be adequate for the proposed improvements. > The quality control ponds need to be designed using N.U.R.P. standards, found in Ch. 4 of"Protecting Water Quality in Urban Areas—Best Management Practices for Minnesota" B. Preliminary Utility Plan • This entire development will be a long dead end serviced off of Waco Street until such time that the seven-acre site to the north is developed and watermain can be looped back to Waco Street. Therefore, we will require an additional looping of the watermain to the existing watermain in Waco Street off of 184th Circle to provide some redundancy to the system. • The Elk River Municipal Utilities water model is being investigated to determine if any of the watermain in the West Oaks development needs to be oversized for fire flow since the development is on the far end of the existing water system. If any does need to be upsized, we will provide that information to the developer's engineer so that is can be shown that way in the final construction plans. • At the west end of 183rd Avenue, an additional catch basin should be added between the last two structures to ensure that the storm sewer is maintained in the public right- of-way. • • Hydrant and valve locations will be reviewed and commented on at the final plan stage. Ltr-051903 Harlicker Howard R. Green Company • Mr. Harlicker May 21, 2003 Page Three C. Miscellaneous • Provisions should be made to ensure that no construction traffic from the development of the site and/or the building of the homes uses 1831d Avenue to the west in Big Lake Township. It is doubtful that this street is constructed to adequate strength to handle heavy construction traffic. During the development phase, simply mounding dirt will prohibit traffic, but once the site is open for building permits, it will be necessary to work with the builders to ensure that no traffic utilizes 183rd Avenue to the west. • The first time this development was reviewed, there was a recommendation based on that development scenario that there be a payment of$122,250 made towards the reconstruction of Waco Street. That recommendation was based on the increased traffic generated by the rezoning request for the West Oaks development. Utilizing the same rationale but the new proposed development scenario, the recommendation would be that a contribution of$106,500 be made towards the reconstruction of Waco Street. Waco Street was reconstructed a couple of years ago with the City financing the reconstruction costs. The $106,500 is based on $1,000 per single-family lot and $750 for townhouse unit. • When we met with the developer, we discussed the setbacks on 184th Circle. Based on the R3 zoning and the number of units on 184th Circle, the requirement is for that • street to be public. That requires a fifty-foot right-of-way from which the setback is measured. Clearly on the north with the wetlands abutting all 12 of the units, the public right-of-way and setback gets the rear of the units relatively close to the wetland. We would suggest that it may be more reasonable to allow 184th Circle to be private and giving a variance for more than 12 units on a private drive (The developer has shown this change on his latest revision). This will eliminate the need for the wide public right- of-way, essentially bringing the units in closer to the private drive and further away from the wetland area. If you have any questions regarding any of these comments, please call. Sincerely, Howard R. Green Company aa4.6e2 Terry J. aurer, P.E. TJM:sw I Ltr-051903-Harlicker Howard R. Green Company • MEMORANDUM TO: Mayor and City Council FROM: Rebecca Haug,Environmental Technician DATE: May 20, 2003 SUBJECT: Wetland Conservation Act Decisions— West Oaks WCA 03-03 Proposal—The developer of West Oaks is proposing to fill 9,049 square feet of a Type 6 wetland in a single location to accommodate the road for the plat. It is the only way to access the plat. The Technical Evaluation Panel (TEP) for the City of Elk River reviewed the proposal and found both the filling and replacement plan acceptable. The replacement plan consists of 9,062 square feet of New Wetland Credit and 9,600 square feet of Public Value Credits (Upland buffer). The new wetland will be created adjacent to the existing wetlands on the site. A map showing the filling and replacement is attached to this memo. FINDINGS • Eagle Soil Services prepared a Wetland Delineation Report for the property dated, April 27, 2000. The Technical Evaluation Panel reviewed the delineation and the replacement plan on May 8, 2003. Combined notification of the proposed filling and replacement plan was mailed out to the appropriate governmental agencies on April 29, 2003. The comment period ended May 19, 2003 and no negative comments were received. The Technical Evaluation Panel found the proposed wetland filling and wetland mitigation plan application dated, April 28, 2003, acceptable under the rules of the Wetland Conservation Act with the stipulations listed below. RECOMMENDATIONS Staff recommends approval of the filling and mitigation plan for this project with the following stipulations: 1. A restrictive covenant and drainage and utility easement be recorded over the mitigation and buffer areas. I 2. The Developer's Agreement for the project includes language that places the responsibility for the success of the wetland mitigation on the developer. 3. The letter of credit, which covers the public improvements associated with the project, also includes the cost of the mitigation work. 4. The developer submit a written monitoring report on the replacement wetlands one year after this mitigation work is completed and that this report be approved by city staff prior to the release of the letter of credit.