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1l Longacres-Lyman Blvd Plans, Specs & Bids CITY OF CHANHASSEN 7700 Market Boulevard PO Box 147 Chanhassen, MN 55317 Administration Phone: 952.227.1100 Fax: 952.227.1110 Building Inspections Phone: 952.227.1180 Fax: 952.227.1190 Engineering Phone: 952.227.1160 Fax: 952.227.1170 Finance Phone: 952.227.1140 Fax: 952.227.1110 Park & Recreation Phone: 952.227.1120 Fax: 952.227.1110 Recreation Center 2310 Coulter Boulevard Phone: 952.227.1400 Fax: 952.227.1404 Planning & Natural Resources Phone: 952.227.1130 Fax: 952.227.1110 Public Works 1591 Park Road Phone: 952.227.1300 Fax: 952.227.1310 Senior Center Phone: 952.227.1125 Fax: 952.227.1110 Web Site www.ci.chanhassen.mn.us it, .....,..,., ..L ",,4 :MEMORANDUM TO: Todd Gerhardt, City Manager 'C? (). Paul Oehme, Dir. of Public Works/City Engineer . {j : ~ L7 . Of.. ,\7 June 12, 2006 FROM: DATE: SUBJ: Longacres Drive Stormwater Pond Outlet Improvement and Lyman Boulevard Sewer Repair Project Nos. 06-08 and 06-09: Approve Plans and Specifications and Authorize Advertisement for Bids REQUESTED ACTION Approve plans and specifications and authorize advertisement for bids for Longacres Drive Stormwater Pond Outlet Improvementand Lyman Boulevard Sewer Repair. BACKGROUND On AprillO, 2006, the City Council authorized a contract with a consultant to prepare plans and specifications for improvements to the Longacres Drive stormwater pond outlet and Lyman Boulevard sewer repair. On May 18,2006, staff held a neighborhood meeting to discuss improvements to the Longacres Drive Pond. DISCUSSION On September 4 and 5,2005, Chanhassen experienced nearly a 100-year rainfall event. The stormwater event caused drainage and erosion problems in many parts of the city. Newly graded developments were particularly susceptible to erosion and drainage problems. In the case of Highcrest Meadows, north of Longacres Drive, the final grading was not complete, the site was not stabilized to withstand the extreme rainfall and the stormwater infrastructure had not been installed. The volume of runoff and accompanying debris and sediment caused damage to a number of existing homes. It also alerted the City to an existing condition in the Longacres neighborhood that intensified the effects of the rain event. If the Highcrest Meadows developmentinfrastructurewould have been completed and the storm sewer system fl.1ncti()Ilil1g,iITlpacts to the existing property owners most likely would not have taken place. . However, due to the amount of runoff and debris that entered the City storm sewer system from the development, the storm sewer system became clogged and backed up. Normally, when storm sewer The City of Chanhassen . A growing community with clean lakes, quality schools, a charming downtown, thriving businesses, winding trails, and beautiful parks. A great place to live, work, and play. Todd Gerhardt June 12, 2006 Page 2 systems backup or become clogged, an emergency overflow (EOF) system should take the runoff and channel it over land away from structures to minimize the amount of property damage. At this particular location, an EOF was designed to flow over Longacres Drive but the road was built approximately 1.5' higher than planned and therefore restricted the overflow from the pond. Also, the properties on the south side of Longacres Drive where the EOF was designed to flow between two properties was not graded to building plan and also restricted the overflow water from the pond. The developer of Highcrest Meadows (Coffman Development, Inc.) and the City have been working together with the affected Longacres residents to identify and devise a solution as a result of the Labor Day weekend storm. The attached drawing shows the most feasible fix of the problem. It involves the installation of an EOF storm sewer pipe from the pond. The other option would be to lower the road. This option would significantly increase the some driveways slopes along Longacres Drive and cause more disruption to the residents. When staff presented these two options at the neighborhood meeting on May 18, 2006, the residents in attendance were in support of moving forward with the pipe option. Construction easements will still need to be acquired prior to construction. The scope of the project includes directionally drilling an 18" emergency outlet pipe from the Longacres pond to the north branch of Bluff Creek. Also, staff is recommending adding additional catch basins on Longacres Drive and replacing the outlet of the Longacres pond with a bigger structure. The 18" emergency outlet pipe is designed to handle runoff from a storm larger then a lOa year event and provide the pond with another outlet if the primary outlet becomes clogged again. Directionally drilling the pipe is proposed to minimize the disruption to the properties along the pipe alignment and decrease the impacts to the adjacent properties. Additional catch basins are proposed on Longacres Drive to direct the water away from entering the pond. Replacement of the outlet structure will provide additional safeguards from debris that currently clog the existing structure. The estimated cost for these improvements is $92,500. Lvman Boulevard Sanitary Sewer Improvement On December 16,2005, a sewer backup occurred in the Summerfield development. The sewer backup was immediately cleared and the sewer pipe was cleaned by City staff. In researching why the sewer backed up, it was determined that a segment of sewer pipe under Lyman Boulevard has settled and caused the sewage to backup. The area of settlement is adjacent to a wetland complex and it is speculated that poor soils under the pipe have settled. The sanitary sewer pipe can no longer be maintained or be relied on for proper sewer flow. It is recommended that the sewer pipe be replaced and any poor soils under the sewer Todd Gerhardt June 12, 2006 Page 3 pipe be removed and replaced with the necessary pipe bedding material. The cost estimate for this work is $37,000. FUNDING The improvements to Longacres Drive Pond were not budgeted for in the 2006 CIP since no project was envisioned at that time. However, in this year's 2006 street improvement project, $136,251.70 out of the $400,000 budgeted (SWMP- 019) is planned to be used. Staff is proposing to use an additional $92,500 out of this CIP item for the constructing of the Longacres Pond improvements. This CIP line item is estimated to be under budget by $171,248.30 if the Longacres Pond improvements are approved. The Lyman Boulevard sanitary sewer improvements were not budgeted for in the 2006 CIP since no project was envisioned at that time. However, in this year's 2006 street improvement project, only $55,426.25 out of the $31O,000 budgeted (SS-014) is planned to be used. Staff is proposing to use an additional $37,000 out of this CIP item for the Lyman Boulevard sanitary sewer improvements. This CIP line item is estimated to be under budget by $217,073.75 if the Lyman Boulevard sanitary sewer improvements are approved. SCHEDULE If these projects were to move forward, the anticipated schedule is: July 10, 2006 - Award Contract August 31, 2006 - Construction Complete Attachments: 1. CIP Pages 2. Longacres Drainage Improvement Map & Construction Drawing 3. Lyman Boulevard Sanitary Sewer Improvements Map c: Mark Statz, Bonestroo & Associates g:\eng\public\06-09 longacres stormwater pond imp\bkgd 061206 ap plans spec bid.doc . Capital Improvement Program City of Clumhossen, MN 2006 thru 2010 Projec.t # SWMP-019 Project Name Street Improvement Projects - Storm Water Mgmt Account # 1 720-0000-4702 Account # 3 Account #2 ] ContaCt Unassigned DepartJilent Surface Water Management I Type Improvement Useful Life Unassigned Category s\VMi> Priority n/a I Total Project Cost $1,100,000 I Description An annual amount set aside for storm water management infrastructure construction or expansion associated with street improvement projects undertaken by the engineering and public works departments. . I I Justification Street improvement projects frequently require construction or expansion of storm water management infrastructure in order to comply with federal, state and local regulations, as well as protecting existing and proposed development adjacent to the projects. . Expenditures Construction 2006 400,000 Total' 400,000 2007 150,000 150,000 2008 300,000 300,000 Funding Sources Surface Water Utility Fund Total 2007 150,000 150,000 2008 300,000 300,000 2006 400;000 400,000 Opertitionol Impact/Other fuventory, inspection and maintenance of new infrastructure will be required: . Citywide. No map 128 2009 100,000 100,000 2009 100,000 .100,000 I I 2010 150,000 150,000 Total 1,100,000 1,100,000 I I I 2010 150,000 150,000 Total 1,100,000 .1,100,000 Capital Improvement Program City of Chanhossen,MN SS-014 2006 thru 2010 Contact Unassigned Department Sanitary Sewer Improvements Type Improvement Useful Life Unassigned Category Utilities Priority n/a Project # Project Name Sanitary Sewer Replacement Account # 1 Account #2 Account # 3 Total Project Cost $810,000 Description I Replacement or rehabilitation of existing sanitary sewer lines in conjunction with the reconstruction of the City street. Justification I The City considers the condition of the existing utilities in the process to select streets for rehabilitation in an effort to realize cost savings by consolidating these projects. Expenditures Construction 2006 310,000 310,000 2007 2008 250,000 250,000 2009 2010 250,000 250,000 Total 810,000 810,000 Total Funding Sources Sewer Utility Fund 2006 310,000 310,000 2007 2008 25Q,000 250,000 2009 2010 250,000 250,000. Total 810,000 810,000 . Total Operatio1U1l Impact/Other I This project will decrease maintenance costs. 109 I ! =:I~ II~' Jg. '1~''':'!t~T}'':'''' J1i ~< :::::::::1::: ... . ... ::::::::: .:....... ......... ::' :::. ......... ... ,::: : ::: ......... ...:::::: :::::::::.. ..'1 .... ......... ... I ... .........,... I........ ....., .........' '.' ...... ... "'mf' ..1..... ...,>: ... 'I::::: ::> .........,.... I I ..... .........r. j........ ......... !IH:' ......... ......... ..........1'. :' . . . . . .. .. I .. . .. . . . . , .. . . . . . "I' . .. . .. .. ........ '1' .. . . . ... .........!......... ......... HHHtIIH.IHHI.HHHHI!HHlj.ii! /~~::::""" / .........IPB4.... -- I ....... .........1...... ....... .....15:.. ___ <. 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SEWER REPAIR G Anderllk & UTILITY AND STREET IMPROVEMENTS ,\I, Associates STORM SEWER IMPROVEMENTS Englneers & An:I1llects m't'W.~ncmoo.=m II:': 6 g " ;;; < 0 < " s~ (") 01 . o ~ [J .. -1 . - -:==-..;------ I ~___J f....~,.. ! ~ft~) r--~~] 'I - ...-- ....'.~.-._---.....- 1_1l':'~~?",.,:,"."..: h ' ....-.-...~. '-_..- \....._u_u_;:' ._.._u_u_.__. \'j;",. _.. .. u /~'.:.:.\___ _._'h ..,;"'~ ""'. .....-..> . Manhole /'/ Existing Sewer Pipe /'/ Sewer Pipe Settlement Location Lyman Blvd. Springfield Addition t February 24, 2006