study for 2018 include:

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1 MEMORANDUM TO: Mayor and City Council gk FROM: Shawn Sanders irector of Public Works DATE: March 15, 2018 RE: Feasibility Study for the 2018 Street Improvement Project Project No INTRODUCTION In November of 2017, council authorized a feasibility study for the 2018 Street Improvement Project. The streets selected in the study were based on a recent pavement management study, that gave a condition index number to guide us on type of work that should be performed. Streets included in this study for 2018 include: Pavement reconstruction Pine Tree Trail Lake Drive South Brick Street ( Pine to Willard) South Seeley Street ( Pine to Willard) West Willard Street ( Brick to Seeley) Bayberry Avenue (Maryknoll to Interlachen) Interlachen Way Interlachen Way Court Bayberry Ave Court Union Alley (Myrtle to Commercial) Mill and Overlay- Industrial Avenue Curve Crest Blvd (Greeley to Washington) Green Twig Way North Sherburne Street (Myrtle to Linden) North William Street (Myrtle to Mulberry) North Mulberry (Owns to Everett) South Sixth Street (Pine to Olive) West Pine Street ( Greeley to Olive Street) Victoria Court Commercial Street Nelson Alley Nelson Street ( Second to Main) South Second Street (Nelson to Commercial) Union Alley (Chestnut to Myrtle) East Olive Street (Third to Main) South Broadway Street was included in the study but time constraints and more communication with the neighborhood is needed in order to complete a study for this area. In all, there are miles of streets proposed for improvements, miles of mill and overlay and miles of pavement reconstruction.

2 Pavement Reconstruction Areas Streets in the West Lily Lake neighborhood ( Pine Tree Trail, Lake Street, Willard, Seeley and Brick) are approaching 50 years old and streets in the Interlachen neighborhood ( Interlachen, Bayberry, Bayberry Ave Court, Interlachen Way Court) were constructed a little of over 30 years ago. Streets in both areas were constructed with storm sewer and curb and gutter. There does not appear to have been any type of improvement on these streets since that time or other routine preventative maintenance of seal coats and asphalt patching and gutter. There are signs of alligator cracking on these streets and other pavement failures. Previous plans show that the pavement thickness is 3. 5" which is less than typical standard of today of 4. 0 inches. Soil borings do show there is an adequate aggregate thickness of at least six inches. There are no records on the construction history of Union Alley between Myrtle and Commercial. The alley is 16 feet wide, 200 feet long and is constructed entirely in concrete with severely cracked sections with water ponding in areas. Mill and Overlay Areas The streets in the residential and downtown area are years in age and were constructed with adequate pavement section to support traffic for residential areas. The pavement is showing signs of deterioration, in the surface, but still has adequate structural strength so that a mill and overlay would improve the surface. Curb and gutter is primarily in good condition. Industrial Avenue and Curve Crest Boulevard were constructed approximately 40 years ago. There has not been any streets improvements on Industrial since that time and Curve Crest Boulevard was last improved in 1998 with a mill and overlay. PROPOSED PROJECT Pavement Reconstruction It is proposed that the streets in the West Lily Lake and Interlachen neighborhood have the pavement removed and replaced. After the pavement is removed, the streets will be graded compacted and tested for any bad areas or soft spots. If there are any bad areas, they would be excavated and fill in with adequate material. Curb and gutter sections that are settled, heaved, or badly cracked will also be removed and replaced. Deteriorated catch basins and manholes would be repaired or replaced and sumps manholes added to help control sediment for entering a pond or wetland. It is proposed the concrete pavement in Union Alley be removed and replaced with a pavement section of 6 inches of aggregate and 4 inches of asphalt. Mill and Overlay All residential streets would have the top inches of bituminous surface milled and overlaid with inches of bituminous. Industrial Avenue and Curve Crest Boulevard would have a 2. 0 inch mill and overlay. Settled, heaved or badly cracked curb sections and sidewalks will be replaced along with all intersection pedestrian ramps in order to meet ADA requirements. Catch basin and sanitary manholes will be looked to determine if the top section of rings need to be

3 rebuilt. The median in Curve Crest would have the existing asphalt removed and replaced with concrete and two unused turn lanes replaced with a median. PROJECT COST AND FINANCING The total estimated cost of the project is $ 2, 156, 021. including design, surveying, inspection, administration, and contingencies. Cost of the project would be funded through three sources, assessments, permanent improvement bond and State Aid funds. Pavement reconstruction $727, According to the City Assessment Policy, street reconstruction project are assessed 70% to the benefitting property owner and 30% from City funds. The cost for the Interlachen and West Lily Lake neighborhoods is estimated at $ 704, Properties would be assessed by the unit method. The preliminary assessment amount for the reconstructed streets is $ 5, per unit. The cost for the reconstruction of Union Alley between Myrtle and Union Alley is $ 23, Adjacent properties would assessed by footage abutting the alley at a cost of $40. 83/ lineal foot. Mill and Overlay Estimated Cost: $ 1, 428,289. According to the City Assessment Policy, Industrial Park properties ( Curve Crest and Industrial) are assessed 100% for street work, all other properties are assessed at 80%. There are two streets in the project area, Pine and Mulberry, which are designated as a State Aid Street. Properties on these streets would be assessed 50%. It is proposed that all residential properties be assessed by the unit method and non-residential properties be assessed per front footage. Assessments for the mill and overlay areas were divided into six categories, Downtown, Residential with sidewalks, Residential without sidewalks, State Aid Streets, Curve Crest and Industrial. A summary of proposed costs and assessments are shown below: Cost Assessment _ Unit LF Rate Assessment Assessment Downtown 237, % / lf Residential w/ sidewalk 106, Sixth and William) 80% Residential w/o sidewalk 126, Green Twig, Sherburne 80% and Victoria State Aid Streets 198, % Pine and Mulberry Curve Crest Blvd 616, % Industrial 143, %

4 Below is a summary of proposed assessments and costs. Assessment Adjusted rate foota a of units Assessment Total amount Partial Reconstruction / unit , , Reconstruction of Union Alley / lf 4001f 16, , M+ O Downtown / lf f 164, , M+O w/sidewalk residential / unit commercial /lf , , f 3, M+O w/ sidewalk / unit , , M+O State Aid / lf , , M+O Curve Crest /If 6615 if 5 423, , M+O Industrial / lf f 143, , Assessment Total 1, 507, , 156, City Projects Fund and State Aid Street Improvement Project Cost 648, , 156, PROPOSED PROPOSED PROJECT PROJECT TIMELINE TIMELINE November November 1, 1, Authorize Feasibility Study March 20, 2018 Presentation of Feasibility Study April 17, 2018 Public Hearing/ Order Improvement May 1, 2018 Approve Plans and Specs/ Authorize bids June June 5, 5, Award Contract June -October Construct Project RECOMMENDATION Since the project is feasible from an engineering standpoint and the project is cost effective, it is recommended that Council accept the feasibility report for the 2018 Street Improvement Project and order a public hearing to be held on April 17, 2018 at 7: 00 PM. ACTION REQUIRED If Council concurs with the recommendation they should pass a motion adopting Resolution No , RESOLUTION RECEIVING REPORT AND CALLING HEARING ON 2018 STREET IMPROVEMENT PROJECT ( PROJECT ).

5 J ' 2018 STREET IMPROVEMENT PROJECT FEASIBILITY STUDY AREA LEGEND IIK- Vater PROPOSED MILL AND THE 4INIHPLACE IF MINNESITA OVERLAY PROPOSED RECONSTRUCT m ND ST. COMMERCIAL ST NELSON ST. NELSON ALLEY OLIVE ST. MULBERRY ST. UNION ALLEY WILLIAM ST. BAYBERRY AVE. BAYBERRY AVE CT. INTERLACHEN WAY T PINE ST. SHERBUA YR SLE S'' F _ 6TH ST. PINE TREE TRL. SEELEY ST. S BRICK ST. S WILLARD ST. LAKE DR. INOT IN STUDYI CURVE CREST BLVD, 1 VICTORIA CT. 1 INDUSTRIAL BLVD. 0 STATE H WY. 6' I