University Park Subdivision Street Assessment Report

Transcription

1 University Park Subdivision Street Assessment Report Prepared for: University Park Subdivision

2 TABLE OF CONTENTS Introduction... 3 Existing Conditions Analysis... 4 Street Improvements... 5 Existing:... 5 Recommendations:... 5 Prioritization:... 6 Existing Street Photos:... 7 Intersection Curb Ramp Improvements Existing: Recommendations: Cost: Existing Intersection Curb Ramp Photos: Conclusion Typical Section Sheet Prioritization of Streets Sheet Block by Block Cost Estimate Cost Estimate by Pavement Rating Cost Estimate Unit Costs Intersection Curb Ramp Cost Estimate

3 Introduction The Trustees of University Park Subdivision selected Horner & Shifrin, Inc. to conduct an assessment and review of certain elements of the infrastructure within the University Park Subdivision. University Park Subdivision is a private development located within University City, MO. The subdivision boundaries include Vanderbilt Ave. to the west, Amherst Ave. (West of Midland Blvd.) & Dartmouth Ave. (East of Midland Blvd.) to the north, up to Pennsylvania Ave. to the east, and Princeton Ave. to the south. Pennsylvania Ave. and Midland Blvd. are not included in the subdivision s limits. The scope of the infrastructure assessment conducted by Horner & Shifrin included the following items listed below: 1. Assess street conditions and pavement surface to determine a logical prioritization 2. Provide improvement options with associated recommendations for repair. 3. Prepare block by block cost estimates to address deteriorated infrastructure. 4. Evaluate storm drainage channelization to existing infrastructure. 5. Evaluate existing curb ramps for ADA compatibility. The project area, hachured in the figure below, is the University Park Subdivision in University City, MO. Location Map 3

4 University Park Subdivision Existing Conditions Analysis The first step for the infrastructure assessment was to conduct a geotechnical investigation to evaluate the existing pavement and subgrade condition. The geotechnical investigation consisted of subsurface exploration, field and laboratory testing, and analysis of the collected samples. Borings at 15 locations within University Park Subdivision were chosen and samples were analyzed. The geotechnical investigations were completed by Shannon and Wilson, Inc. The existing asphalt surface of the streets within the project area range from 1 inch to 2 inches of asphalt wearing surface. Generally, it was found that the subbase for the streets on the west side of Midland Blvd. consisted of deteriorated concrete ranging in thickness from 5.5 inches to 7.5 inches. The East side of Midland Blvd. however, consisted of subbase composed of poorly graded gravel intermixed with cobbles. A full geotechnical engineering report was formalized and dated January 21, 2015 and is available separately for review. 4

5 Street Improvements Existing: In 2003 the University Park Subdivision began a project that includes constructing new 6 vertical curb and gutter on all the streets throughout the subdivision. These curbs will improve the drainage throughout the corridor by providing stormwater channelization to inlets. Generally the existing pavement section on University Park Subdivision streets consists of a Asphalt wearing surface on top of poorly graded gravel intermixed with cobbles. The base rock appears to have previously been a cobble street that was deteriorated prior to receiving an asphalt overlay. Typical University Park Subdivision Street Subbase Many of the streets have extensive asphalt patching with varied degrees of settling throughout the corridor. When driven at normal speeds, many of the streets experience waviness due to asphalt rutting. Alligator cracking is also evident in many portions of the subdivision s roadways. Photos of typical existing street sections are provided on Page 7. Recommendations: Several options were investigated to improve University Park Subdivision Streets such as Full Reconstruction and Mill & Overlay. See the Typical Section Sheet listed on page 18 of the report for additional information on the pavement selection options. Full Reconstruction of roadway may be necessary in failed pavement areas. Full Reconstruction options were based on St. Louis County typical street standard drawings which consists of either 6 of concrete on 4 of Aggregate Base or 9 of asphalt on 4 Aggregate Base. In both options the existing asphalt wearing surface and cobblestone base will be removed to the required depth of the new pavement section. The existing 6 vertical curb and gutter shall remain in place and will be flush with the new pavement section. 5

6 A Mill and Overlay option should be sufficient to improve the majority of the streets within the University Park Subdivision. Two mill and overlay options were investigated. The first includes milling down approximately 1.5 to the cobblestone base and replacing with new 1.5 asphalt overlay wearing surface. The second includes the same 1.5 milling but the new asphalt overlay will be increased to 3.5 at the centerline of the roadway and transition down to the 1.5 at the face of the existing gutter pan. The increase in asphalt depth along the most heavily used portion of the road will add lifespan to the project. Both mill and overlay options will tie flush into the existing curb and gutter without any asphalt overlay on top of the gutter pan. Thus, the project will not adversely affect any driveways or drainage along the project corridor. Another option that was investigated that could add lifespan to the asphalt overlay is an engineered paving mat. Typically these mats are laid on a clean asphalt base course or a fine aggregate leveling course. Because the existing subbase of the University Park Subdivision Streets is mostly cobblestones, a fine aggregate leveling course would need to be placed on top of the existing cobblestone base to reap the benefits of this product. Unfortunately with only a 1.5 thick existing asphalt surface on most of the streets, there is insufficient depth to use the mat. It is possible to remove some of the cobblestone base to provide sufficient depth to use a paving mat, but it may prove difficult for the contractor to construct. This may drive the price of the paving mat above the typical cost of approximately $4 per square yard. Therefore, a paving mat is not recommended for the street repair. Pavement Patch was added to the cost estimates for the Mill & Overlay options. The Pavement Patch would be used after milling operations occur and soft areas still remain after compaction. Some of the boring test locations indicated that the predominant soil classification was a high plastic, soft clay. These soft areas would then be identified and a new aggregate subbase with full depth asphalt would replace the unsuitable existing base. The streets in the vast majority of University Park Subdivision have adequate drainage along the existing vertical curb and gutter section. This is due to the curb and gutter replacement project the subdivision has been working on over the past decade. The newly constructed 6 vertical curb and gutter have sufficient gutter capacity for storm drainage. Both Mill & Overlay options suggested in this report will tie into the existing gutter pan as to not negatively affect the storm drainage conveyance. Also the existing street cross slopes are of sufficient grade to direct the storm water flow to the gutters. The variable depth overlay option will increase cross slope slightly improving the storm water conveyance, while the Mill & overlay option will match the existing cross slope and storm water conveyance effectiveness. Prioritization: A University Park Subdivision Map has been prepared that indicates the pavement ratings of the streets. Pavement Ratings were determined using a system similar to PASER (Pavement Surface Evaluation and Rating) system. The PASER system is a comprehensive pavement management system that involves collecting data and assessing several road characteristics: roughness (ride), surface distress (condition), surface skid characteristics, and structure (pavement strength and deflection). The streets varied from a good pavement rating to failed. Generally over time streets deteriorate through phases as indicated in the chart on page 7. The time is takes to go from Good to Failed depends largely on the traffic loading and quality of construction. 6

7 Existing Street Photos: Very Poor Section of Amherst Avenue - East of Purdue Ave. 7

8 Very Poor Section of Colgate Avenue West of Purdue Ave. Failed Section of Cornell Avenue East of Midland Blvd. 8

9 Failed Section of Dartmouth Avenue East of Midland Blvd. Failed Section of Stanford Avenue West of Purdue Ave. 9

10 Fair Section of Tulane Avenue East of Midland Blvd. Good Section of Vassar Avenue 10

11 Good Section of Vanderbilt Avenue Poor Section of Princeton Avenue East of Midland Blvd. 11

12 Good Section of Princeton Avenue West of Purdue Ave. Very Poor Section of Cambridge Avenue East of Midland Blvd 12

13 Intersection Curb Ramp Improvements Existing: The North-South streets of Vanderbilt Avenue, Purdue Avenue, and Vassar Avenue all have either non-ada compliant ramps or no ramps at all at their intersections. See the existing intersection curb ramp photos beginning on page 14. Recommendations: All intersections should be improved to provide pedestrian access to meet ADA guidelines. St. Louis County standard plans should be used for design and construction of curb ramps at all intersections within the subdivision. Two standard curb ramp types have been identified which will address most of the intersection configurations; special details will be developed for any non-standard intersections. The Subdivision Trustees have mentioned their preference of Blended Transition Curb Ramps over Directional Ramps with raised curb island between the ramps. See the blended transition curb ramp detail below. Proper construction of the curb ramps will require that sidewalk in the vicinity of the curb ramps be replaced to maintain appropriate grades for the ramps. Detectable warning panels will be installed at all street crossings. Cost: Typical Blended Transition with grass buffer curb ramp configuration Page 23 shows a summary of the estimated construction costs for the intersection curb ramp improvements. The construction costs are based on a blended transition curb ramp configuration with an estimated cost of $4,000 per each ramp. The total number of ramps to be constructed is 36 within the University Park Subdivision Limits resulting in an estimated total construction cost of $144,

14 Existing Intersection Curb Ramp Photos: Intersection of Princeton Avenue and Purdue Avenue Intersection of Princeton Avenue and Purdue Avenue 14

15 Intersection of Purdue Avenue and Cornell Avenue Non-Compliant Ramp at Intersection of Purdue Avenue and Colgate Avenue 15

16 Intersection of Purdue Avenue and Amherst Avenue Intersection of Vanderbilt Avenue and Cornell Avenue 16

17 Conclusion Cost estimates have been prepared to help the University Park Subdivision Trustees financially plan for improving the infrastructure within the subdivision. These estimates were developed using bid tabs of projects similar in type and scale. It should be noted that depending on the amount of the streets that will be upgraded at one time, the unit costs may be affected. Generally, the more streets that will be addressed at once the cheaper the unit costs. Also a 15% contingency is included in each option. This will cover adjusting of manholes, water valves, unknowns, and other miscellaneous items. The pavement patch listed in the estimate will be utilized if the contractor uncovers any unsuitable or unusable base material after milling. In these areas full depth pavement with new base will be used. The goal of the street improvements is to maximize the life of the new pavement while considering the impacts to the subdivision s budget. With these concerns in mind, Horner and Shifrin recommends only replacing the Failed pavement areas listed in the prioritization sheet with a full depth pavement. The variable depth overlay option should provide the best value in improving the streets with the most immediate need, such as Very Poor and Poor areas. The Good and Fair areas can continue to be monitored and as they deteriorate can be scheduled for maintenance. 17

18 CURB & GUTTER CURB & GUTTER LANE LANE CURB & GUTTER CURB & GUTTER LANE LANE DATE PREPARED 6/15/2015 ROUTE STATE EX. CURB & GUTTER MO DISTRICT SHEET NO. 2% 2% 2% 2% 18 COUNTY JOB NO. CONTRACT ID. TYPICAL SECTION TYPICAL SECTION 2" ASPHALT WEARING CONCRETE RECONSTRUCTION OPTION 1 - FULL RECONSTRUCTION ASPHALT RECONSTRUCTION SURFACE 6" CONCRETE 7" ASPHALT BASE 1. FULL PAVEMENT RECONSTRUCTION WITH EITHER; 4" AGGREGATE BASE 6" CONCRETE ON 4" OF AGG. BASE OR 4" AGGREGATE BASE EX. CURB & GUTTER 2" ASPHALT WEARING SURFACE ON 7" ASPHALT BASE ON 4" AGG. BASE FEDERAL PROJECT NO. OPTION 2 - MILL AND OVERLAY 1. MILL TO EXISTING DETORIATED BASE, APPROX. 1.5" 2. LAY 1.5" ASPHALT OVERLAY CURB & GUTTER LANE LANE CURB & GUTTER DESCRIPTION MATCH EXISTING MATCH EXISTING DATE OPTION 3 - MILL AND VARIABLE DEPTH OVERLAY 1.5" MILL AND 1.5" OVERLAY CURB & GUTTER LANE TYPICAL SECTION 1.5" MILL & 1.5" OVERLAY LANE CURB & GUTTER EX. CURB & GUTTER THE POW ER HOUSE AT UNION STATION 401 S. 18th St., Ste. 400 ST. LOUIS, MO FAX: Certificate of Authority: Expiration Date: December 31, MILL TO EXISTING DETORIATED BASE, APPROX. 1.5" 2. LAY VARIABLE DEPTH OVERLAY (3.5" ASPHALT OVERLAY AT CENTERLINE TO 1.5" OVERLAY AT GUTTER PAN) 1.5" OVERLAY VARIES 3.5" OVERLAY TYPICAL SECTION 1.5" MILL & VARIABLE DEPTH OVERLAY (3.5" OVERLAY AT CENTERLINE TO 1.5" OVERLAY AT GUTTER PAN) VARIES 1.5" OVERLAY EX. CURB & GUTTER UNIVERSITY PARK SU BDIVISIO N TYPICAL SECTIONS JUNE 15, 2015 SHEET 1 OF 1 REV....\002_Typicals-Revised Options.dgn 1:35:29 PM 6/15/2015

19 DATE PREPARED 6/15/2015 ROUTE STATE MO VERNON DISTRICT SHEET NO. 19 COUNTY JOB NO. CONTRACT ID. FEDERAL PROJECT NO. DARTMOUTH AMHERST TULANE AMHERST COLGATE 7300 COLGATE 7100 AMHERST PENNSYLVANIA DESCRIPTION STANFORD 7200 STANFORD 7000 LEGEND VANDERBILT CORNELL PRINCETON PURDUE STANFORD CORNELL CAMBRIDGE M IDLAND BLVD CAMBRIDGE PRINCETON PRINCETON 7100 CORNELL VASSAR DATE THE POW ER HOUSE AT UNION STATION 401 S. 18th St., Ste. 400 ST. LOUIS, MO FAX: Certificate of Authority: Expiration Date: December 31, 2016 GOOD CONDITION PAVEMENT FAIR CONDITION PAVEMENT POOR CONDITION PAVEMENT VERY POOR CONDITION PAVEMENT DELMAR BLVD SCALE UNIVERSITY PARK SU BDIVISIO N PAVEM ENT RATING ASSESSM ENT FAILED PAVEMENT REV....\Cad\T\Exhibits\Plansheet.dgn 1:36:27 PM 6/15/2015

20 20 PAVEMENT RATING UNIVERSITY PARK STREET REPAIR COST BREAKDOWN (BLOCK BY BLOCK) STREET FROM TO BLOCK AREA (sy) Concrete Reconstruction Asphalt Reconstruction Mill & Variable Depth Overlay VERY POOR AMHERST AVENUE VANDERBILT AVE. PURDUE AVE ,800 $91,000 $77,000 VERY POOR AMHERST AVENUE PURDUE AVE. MIDLAND BLVD ,500 $81,000 $69,000 POOR AMHERST AVENUE MIDLAND BLVD. PENNSYLVANIA AVE & ,800 $188,000 $159,000 Mill & Overlay VERY POOR COLGATE AVENUE VANDERBILT AVE. PURDUE AVE ,800 $91,000 $77,000 FAIR COLGATE AVENUE PURDUE AVE. MIDLAND BLVD ,800 $91,000 $77,000 VERY POOR STANFORD AVENUE VANDERBILT AVE. PURDUE AVE ,200 $39,000 $33,000 FAILED STANFORD AVENUE VANDERBILT AVE. PURDUE AVE ,600 $148,000 $128,000 FAIR STANFORD AVENUE PURDUE AVE. MIDLAND BLVD ,000 $97,000 $82,000 POOR STANFORD AVENUE MIDLAND BLVD. PENNSYLVANIA AVE & ,500 $146,000 $123,000 POOR CORNELL AVENUE VANDERBILT AVE. PURDUE AVE ,600 $84,000 $71,000 GOOD CORNELL AVENUE PURDUE AVE. MIDLAND BLVD $23,000 $20,000 FAIR CORNELL AVENUE PURDUE AVE. MIDLAND BLVD ,700 $88,000 $74,000 FAIR CORNELL AVENUE MIDLAND BLVD. PENNSYLVANIA AVE ,000 $33,000 $28,000 VERY POOR CORNELL AVENUE MIDLAND BLVD. PENNSYLVANIA AVE & ,800 $59,000 $50,000 FAILED CORNELL AVENUE MIDLAND BLVD. PENNSYLVANIA AVE & ,200 $111,000 $96,000 GOOD PRINCETON AVENUE VANDERBILT AVE. PURDUE AVE ,100 $101,000 $85,000 GOOD PRINCETON AVENUE PURDUE AVE. MIDLAND BLVD ,600 $149,000 $126,000 FAIR PRINCETON AVENUE MIDLAND BLVD. VASSAR AVE ,100 $36,000 $31,000 POOR PRINCETON AVENUE MIDLAND BLVD. VASSAR AVE ,400 $46,000 $39,000 VERY POOR PRINCETON AVENUE MIDLAND BLVD. VASSAR AVE $20,000 $17,000 FAIR DARTMOUTH AVENUE MIDLAND BLVD. PENNSYLVANIA AVE & ,100 $68,000 $58,000 POOR DARTMOUTH AVENUE MIDLAND BLVD. PENNSYLVANIA AVE & ,600 $52,000 $44,000 FAILED DARTMOUTH AVENUE MIDLAND BLVD. PENNSYLVANIA AVE & ,000 $92,000 $80,000 FAIR TULANE AVENUE MIDLAND BLVD. PENNSYLVANIA AVE & ,800 $156,000 $132,000 FAIR CAMBRIDGE AVENUE PRINCETON AVE. MIDLAND BLVD ,700 $55,000 $47,000 VERY POOR CAMBRIDGE AVENUE MIDLAND BLVD. VASSAR AVE ,100 $68,000 $58,000 FAILED CAMBRIDGE AVENUE MIDLAND BLVD. VASSAR AVE ,000 $92,000 $80,000 GOOD VANDERBILT AVENUE DELMAR BLVD. AMHERST AVE. 3,900 $126,000 $107,000 FAIR PURDUE AVENUE DELMAR BLVD. AMHERST AVE. 4,200 $136,000 $115,000 GOOD VASSAR AVENUE DELMAR BLVD. PENNSYLVANIA AVE. 3,000 $97,000 $82,000 TOTALS 73,200 $443,000 $384,000 $2,221,000 $1,881,000

21 21 PAVEMENT RATING UNIVERSITY PARK STREET REPAIR COST BREAKDOWN (BY PAVEMENT RATING) STREET FROM TO BLOCK AREA (sf) AREA (sy) Concrete Reconstruction Asphalt Reconstruction FAILED STANFORD AVENUE VANDERBILT AVE. PURDUE AVE ,600 $148,000 $128,000 FAILED CORNELL AVENUE MIDLAND BLVD. PENNSYLVANIA AVE & ,200 $111,000 $96,000 FAILED DARTMOUTH AVENUE MIDLAND BLVD. PENNSYLVANIA AVE & ,000 $92,000 $80,000 FAILED CAMBRIDGE AVENUE MIDLAND BLVD. VASSAR AVE ,000 $92,000 $80,000 SUBTOTAL 4,800 $443,000 $384,000 Mill & Variable Depth Overlay Mill & Overlay VERY POOR AMHERST AVENUE VANDERBILT AVE. PURDUE AVE ,800 $91,000 $77,000 VERY POOR AMHERST AVENUE PURDUE AVE. MIDLAND BLVD ,500 $81,000 $69,000 VERY POOR COLGATE AVENUE VANDERBILT AVE. PURDUE AVE ,800 $91,000 $77,000 VERY POOR STANFORD AVENUE VANDERBILT AVE. PURDUE AVE ,200 $39,000 $33,000 VERY POOR CORNELL AVENUE MIDLAND BLVD. PENNSYLVANIA AVE & ,800 $59,000 $50,000 VERY POOR PRINCETON AVENUE MIDLAND BLVD. VASSAR AVE $20,000 $17,000 VERY POOR CAMBRIDGE AVENUE MIDLAND BLVD. VASSAR AVE ,100 $68,000 $58,000 SUBTOTAL 13,800 $449,000 $381,000 POOR AMHERST AVENUE MIDLAND BLVD. PENNSYLVANIA AVE & ,800 $188,000 $159,000 POOR STANFORD AVENUE MIDLAND BLVD. PENNSYLVANIA AVE & ,500 $146,000 $123,000 POOR CORNELL AVENUE VANDERBILT AVE. PURDUE AVE ,600 $84,000 $71,000 POOR PRINCETON AVENUE MIDLAND BLVD. VASSAR AVE ,400 $46,000 $39,000 POOR DARTMOUTH AVENUE MIDLAND BLVD. PENNSYLVANIA AVE & ,600 $52,000 $44,000 SUBTOTAL 15,900 $516,000 $436,000 FAIR COLGATE AVENUE PURDUE AVE. MIDLAND BLVD ,800 $91,000 $77,000 FAIR STANFORD AVENUE PURDUE AVE. MIDLAND BLVD ,000 $97,000 $82,000 FAIR CORNELL AVENUE PURDUE AVE. MIDLAND BLVD ,700 $88,000 $74,000 FAIR CORNELL AVENUE MIDLAND BLVD. PENNSYLVANIA AVE ,000 $33,000 $28,000 FAIR PRINCETON AVENUE MIDLAND BLVD. VASSAR AVE ,100 $36,000 $31,000 FAIR DARTMOUTH AVENUE MIDLAND BLVD. PENNSYLVANIA AVE & ,100 $68,000 $58,000 FAIR TULANE AVENUE MIDLAND BLVD. PENNSYLVANIA AVE & ,800 $156,000 $132,000 FAIR CAMBRIDGE AVENUE PRINCETON AVE. MIDLAND BLVD ,700 $55,000 $47,000 FAIR PURDUE AVENUE DELMAR BLVD. AMHERST AVE ,200 $136,000 $115,000 SUBTOTAL 23,400 $760,000 $644,000 GOOD CORNELL AVENUE PURDUE AVE. MIDLAND BLVD $23,000 $20,000 GOOD PRINCETON AVENUE VANDERBILT AVE. PURDUE AVE ,100 $101,000 $85,000 GOOD PRINCETON AVENUE PURDUE AVE. MIDLAND BLVD ,600 $149,000 $126,000 GOOD VASSAR AVENUE DELMAR BLVD. PENNSYLVANIA AVE ,000 $97,000 $82,000 GOOD VANDERBILT AVENUE DELMAR BLVD. AMHERST AVE ,900 $126,000 $107,000 SUBTOTAL 15,300 $496,000 $420,000 TOTALS 73,200 $443,000 $384,000 $2,221,000 $1,881,000

22 22 ENGINEER'S CONCEPTUAL ESTIMATE OF STREET REPAIR COST ITEM DESCRIPTION UNIT UNIT COST FULL RECONSTRUCTION - CONCRETE OPTION Removals SY $15 Concrete Pavement, 6" Thick SY $50 Type 5 Aggregate for Base, 4" Thick SY $7 Mobilization (10%) SY $8 Contingency (15%) SY Unit Cost Subtotal $12 $92 FULL RECONSTRUCTION - ASPHALT OPTION Removals SY $15 Asphalt Pavement, 9" Thick SY $40 Type 5 Aggregate for Base, 4" Thick SY $7 Mobilization (10%) SY $7 Contingency (15%) SY Unit Cost Subtotal $11 $80 1.5" MILL & VARIABLE DEPTH OVERLAY Milling, 1.5" SY $3 Asphalt Pavement, Varible Depth (1.5"-3.5") SY $12 Pavement Patch (15% Area) SY $9 Mobilization (10%) SY $3 Contingency (15%) SY Unit Cost Subtotal $5 $32 1.5" MILL & 1.5" OVERLAY Milling, 1.5" SY $3 Asphalt Pavement, 1.5" SY $8 Pavement Patch (15% Area) SY $9 Mobilization (10%) SY $3 Contingency (15%) SY Unit Cost Subtotal $4 $27 Assumes $80/Ton for Asphalt UNIVERSITY PARK SUBDIVISION UNIVERSITY CITY, MISSOURI JUNE 15, 2015

23 23 ENGINEER'S CONCEPTUAL ESTIMATE OF CURB RAMP UPGRADE COST UNIVERSITY PARK SUBDIVISION UNIVERSITY CITY, MISSOURI JUNE 15, 2015 ITEM DESCRIPTION UNIT UNIT COST QUANTITY TOTAL BLENDED TRANSITION RAMP 7" Concrete Curb Ramp SY $85 12 $1,020 4" Concrete Sidewalk SY $60 12 $720 Type "S" Concrete Curb LF $25 65 $1,625 Detectable Warning Panel SF $30 20 $600 TOTAL PER RAMP USE VANDERBILT AVENUE (10 RAMPS) PURDUE AVENUE (20 RAMPS) VASSAR AVENUE (6 RAMPS) UNIVERSITY PARK SUBDIVISION CURB RAMP UPGRADE TOTAL $3,965 $4,000 $40,000 $80,000 $24,000 $144,000