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Home My WebLink About2009 02 09 Regular 607 Final Engineering and Landscape Plans for Proposed Northern Way Borrow AreaCOMMISSION AGENDA ITEM 607 February 9, 2009 Meeting Consent Information Public Hearin Re ular X MG /DEPT ~~~ REQUEST: The Public Works Department requests the City Commission review the Final Engineering and Landscape plans for the proposed Northern Way Borrow Area, located on the Tuscawilla Country Club property on the north side of Northern Way west of Shetland Avenue PURPOSE: To review the Final Engineering and Landscape plans for the proposed Northern Way Borrow Area APPLICABLE LAW AND PUBLIC POLICY: City Code Chapter 5 -Tree Protection and Preservation City Code Chapter 9 -Land Development City Code Chapter 20 -Zoning Chapter 163 FS Chapter 166 FS Comprehensive Plan Settlement Agreement as amended BACKGROUND INFORMATION: • Final Engineering /Site Plan and a Developer's Agreement for the Tuscawilla Greens 60- unit condominium project adjacent to the Tuscawilla Country Club were approved by the City Commission at the September 8, 2008 meeting. The Northern Way Borrow Area is a related project being submitted to the City Commission as an amendment to the approved Tuscawilla Greens Final Engineering plans. • The Tuscawilla Greens site requires extensive over-excavation and removal of unsuitable soil materials near the ground surface. In addition, much of the finished grading at the site is above the existing grade. Fill material must be imported from an offsite location in order to raise the finished grades across the site and replace the unsuitable soils. PROJECT OVERVIEW: • The Northern Way Borrow Area is proposed as a source of fill material for the Tuscawilla Greens site. The Borrow Area is located on the Tuscawilla Country Club property, at the February 9, 2009 Regular Agenda Item #607 Page 2 of 3 north side of Northern Way, west of the Shetland Avenue intersection (see Exhibit 1 -Aerial Map). The Borrow Area is located between the Northern Way right-of--way and the fairway for golf course hole #4. Soil excavated from the Northern Way Borrow Area will be hauled to the Tuscawilla Greens site by trucks using a route from Northern Way east to Greenbriar Lane north to Winter Springs Boulevard. Tuscawilla Greens is located on the south side of Winter Springs Boulevard between the Country Club and Howell Creek. • The Borrow Area is being designed to look and function similar to a wet retention pond. The bottom of the Borrow Area is at elevation 30.0, which is varies from approximately 19 to 23-feet below the existing ground surface. The pond will have standard 4:1 side slopes along the perimeter to a depth of 3-feet below the normal water surface elevation, where the slopes transition to 2:1, per the City Code (Section 9-241.d.2). • The pond is shown with a normal water elevation of 48.0, which is approximately 3-feet below the top of the surrounding pond bank. A pond water surface elevation of 48.0 is above both the normal and seasonal high groundwater levels. According to the geotechnical report, the normal groundwater level is approximately 12-feet below the existing grade and the seasonal high groundwater is approximately 7-feet below the existing grade. A well will be required as a supplemental water source to raise the water level in the pond to 48.0. Using a well to artificially raise a pond water level above the normal groundwater level, as proposed with this project, is not a recommended practice for conservation of water resources. • An impervious pond liner is proposed to restrict infiltration and maintain the pond water level. Please see the attached letter from the geotechnical engineer (Exhibit 2) for more information regarding the pond liner design. OFFSITE DRAINAGE AND EMERGENCY OUTFACE: • The Northern Way Borrow Area will receive stormwater surface runoff from the south and east sides. On the south side of the pond, stormwater runoff from the north side of the Northern Way right-of--way will drain into the pond. On the east side, the proposed pond is within an existing drainage easement on property owned by the golf course but serving the adjacent Arrowhead Unit 1 subdivision. Under the original stormwater design for Arrowhead Unit 1, there was a small dry retention area immediately west of the subdivision. This dry retention area was designed to receive stormwater runoff from a Swale draining from east to west across the back of the lots in Arrowhead Unit 1. The proposed pond has been designed to provide equal or greater capacity than the dry retention area as it was originally designed, as required by the terms of the Arrowhead Unit 1 drainage easement agreement. • The proposed pond is designed to retain the 100-year storm when starting from its normal water elevation of 48.0. The pond has been designed with an emergency overflow in the event of an extremely large storm or a series of severe storms. The overflow consists of a low spot in the pond bank located near the northeast corner. Stormwater overflow from this low point would discharge towards the hole #4 fairway and would then follow the existing established drainage pattern in this area. 2 February 9, 2009 Regular Agenda Item #607 Page 3 of 3 BORROW AREA /POND APPEARANCE: • The top of the pond bank will be at the existing grade, meaning that the pond bank will not obstruct the view of the golf course from Northern Way. • No existing trees will be removed for the pond construction. All existing trees in the project vicinity are required to have tree protection barricades as shown on the Final Engineering plans. • The proposed pond will have a 3-tier fountain in the center and shallow water (littoral) plantings along the perimeter of the pond. These shallow water plantings improve water quality and enhance the pond appearance without obstructing the view of the golf course from the surrounding homes. • The pond will not be fenced, similar to most wet ponds in the City meeting the applicable design standards. The pond bank has 4:1 side slopes and a fence is not required by Code. The top of pond bank on the south side is located approximately 35-feet from the Northern Way pavement, a 25-mph residential street. COMMUNICATION WITH SURROUNDING RESIDENTS: • The surrounding homeowners immediately adjacent to the site have been notified about the project and were asked to provide input. The homeowners were all issued copies of the design plans and an aerial map showing the approximate location of the borrow area /pond relative to their homes. Several questions have been asked to City Staff about the project to date and no objections have been communicated to Staff. RECOMMENDATION: Staff recommends the Commission review the proposed Final Engineering and Landscape plans for the Northern Way Borrow Area. The project complies with the City Code; however, Staff remains concerned about the proposed use of a well to artificially raise the pond water level above the normal groundwater level, which is not a recommended practice for conservation of water resources. ATTACHMENTS: 1. Exhibit 1 -Aerial Map 2. Exhibit 2 -Letter from Universal Engineering Services dated October 22, 2008 3. Exhibit 3 -Final Engineering Plans COMMISSION ACTION: 3 Picture. Tuscawilla Greens, LLC 1491 East SR 434, Unit 103 Winter Springs, Florida 32708 Attention: Mr. Tom Corkery EXHIBIT 2 October 22, 2008 Reference: Northern Way Pond Liner Recommendations Tuscawilla Greens, Winter Springs Seminole County, Florida UES Project No.: 0130.0800247.0000 UES Report No.:726738 Dear Mr. Corkery. OFFICES IN • Daytona Beach, FL • DeBary, FL • Fort Myers, FL • Gainesville, FL • Hollywood, FL • Jacksonville, FL • Norcross, GA • Ocala, FL • Orlando, FL • Palm Coast, FL • Pensacola, FL • Rockledge, FL • Sarasota, FL • St. Augustine, FL • Tampa, FL • West Palm Beach, FL Based on our conversations with Mr. Ted Schwartzhoff, P.E. with Dave Schmitt Engineering, Inc., we understand that the City of Winter Springs requires confirmation that the proposed impervious liner will function as intended under the proposed operating conditions including its interaction with the groundwater table. We had previously provided our recommendations for the proposed liner to Dave Schmitt Engineering, Inc., via a-mail. Universal Engineering Sciences, Inc. (UES) has previously completed a geotechnical exploration of the northern way pond and a summary of our findings were presented in our report UES report No. 702366 dated July 24, 2008. A 20-mil PVC liner or equivalent will likely provide an adequate impervious zone through which would significantly restrict infiltration into the su~cial aquifer, thus maintaining the water level within the pond. The upstream edge of the liner should be secured by means of an anchor trench. For the anchor trench, we recommend minimum dimensions of 2 feet by 2 feet (vertical by horizontal), with the liner material laid along the walls of the anchor trench and clean, compacted backfill placed atop the liner within the trench. Similarly, the upslope edge of the liner adjacent to the wing walls should be secured by a trench. The liner should always have a minimum cover of 3 feet of clean sand fill material. The sand cover will protect the liner from punctures and ensure it remains in place. Construction equipment spreading the sand over the pond bottom must never come into contact with the liner, or the liner will be compromised and require major repair(s). At least 12 inches or more of sand should be between the liner and the heavy equipment and trucks wheels and tracks moving and spreading the soil cover over the liner. UNIVERSAL ENGINEERING SCIENCES Consultants in: Geotechnical Engineering • Environmental Engineering Tuscawiila Greens LLC UES Project No.: 0'130.0800247.0000 UES Document No.; 726738 October 22, 2008 ~I )t is our professional opinion that a liner installed by installed by a qualified, competent liner installer; following the specifications in this letter, -will function as 'intended under the proposed normal operating conditions including its interaction with the groundwater table. Also during installation, no hard soled shoes should come into contact with the liner, only soft, rubber soled tennis shoes, in order to prevent hales firom occurring in the liner. We appreciate the opportunity to have worked with you on this project and look forward to a continued association. Please do not hesitate to contact us if you should have any questions. Respectfully .submitted, UNIVERSAL. ENGINEERING SCLENCES, INC. Certificate of Authorization No. 549 f~ .~ ,~1' )~ ~~ r r ,~' ~/ ..-~~/ Ricard C Ki ak~~d~s L., Ph.D., E.I. Projee# Manager RCKUDIN/AVR: as ,. .David Wilshaw, M.S., P:G. Geotechnical Department hllanager J~ ,-- Date: P.E. No. 656 7 Senior Project Manager PJI.S., P,E. The Greens at Tuscawilla — Northern Way Borrow Area Plant Material List LIT 19 Lagerstroemia indica `Tonto' / Tonto Crape Myrtle 15 gal. MT SB 193 Spartina bakerii / Sand Cord Grass 1 gal. 3' oc DTV 90 Daniella Tasmanica Variegated / Flax Lily 1 gal. 3' oc PC 112 Pontederia cordata / Pickerelweed bare root 4" 3'oc SL 110 Sagittaria Iancifolia / Duck Potato bare root 4" 3'oc 3" layer pine straw much under LIT, SB & DTV. Coordinate irrigation with existing. 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TYPICAL BORROW AREA SECTION HAUL ROUTE '8 Npf roSCALE HOE SCALE ar.Aw..r ••!«..,.,...°.w.. >w DAVE SCHMITT co.,YAnw•AO.r... RERS0014$ DAVE 41.6cHNrrr DATE: car T. 2005 MN ENGINEERING, INC. DATE Or DPSCRIPTION DATE IN DE5CRIF0ON — FOORIOA AEG,MATER SITE PLAN H.ns,°^.e..«•..w A .......w....,,.m. M. ....1 °«..,Mww.. ,S77P PROJECT HO: C1-0.2 , DRAWN 11Y: Y: GAO a 17013 FOUNDERS SQUARE OR. ' " . °,.., � •" ^"" "'°' """• "'�" - N ORTHERN WAY BORROW AREA CHECKED Sr IFS ORLANDO, Ft 32028 II)SIIIII _ FAX w s.__ rM.• _ -- - SCALE: 1 SHEET: 0 OF — s FAX c07.207•BO55 '"'"° •- •«rr *a w. - • < •.'�•+�• -w.-• WINTER SPRINGS, FLORIDA Outdoor 515 Park Ave. N., Ste. 216 n Winter Park, FL 32789 1j1p7W5 -/7 fi ti X Design www.outdoordesignworks.com / // f) Works 407.644.7335 (v) 407.644.5622 (f) /•/ 9.0.? AZ RLA =17599 • CA RLA # 4855 • FL RLA 40001647 • TX RLA #1912 Drawing Drawing Drawing Drawing Drawing