Stribling Avenue Cost
  Estimate Analysis
                Jack Dawson, PE
City of Charlottesville Public Works Engineering
    Typical Planning/
Design/Estimate Process:
                  Identification
                 ->Prioritization
                ->Planning Study
   ->Cost Estimate #1 w/Heavy Contingencies
          ->30% Design with Alternates
       ->60% Design & New Cost Estimates
      ->90% Design and New Cost Estimates
   -> Construction/Bid Phase Cost Established
This Exercise Is an Expedited “Over/Under”
more so than an Estimate.
-This is not an existing priority project so background info is minimal
-Includes 20% Contingency
-Has not gone through community engagement/stakeholder meetings
-Projects of this type are not insignificant undertakings nor are they
“cookie-cutter” in design typology or execution.
-The revised layout is preliminary, the estimate should not be
considered final.
Considerations for Designing Streetscapes in
Developed Corridors
1- ROW takes
2-Driveway tie in costs/temporary easements
3-Drainage requirements
4-SWM impacts
5-Utility Relocation
6-Roadway improvements
Other non-priced impacts:
7-Existing Parking Reductions
8-Tree canopy removal
                          Steps Taken:

     1. Analyze existing corridor for physical constraints (width, retaining walls,
     challenging driveway tie ins, etc) as well as safe crossing zones to revise layout to
                                    sidewalk on one side
2.   Review estimate in comparison with revised concept layout for areas where costs
                are likely to escalate and qualify non-cost related impacts.
                3. Revise estimate for likely escalations found above
Provided Concept:
Existing Corridor Analysis
• Physical Constraints
      -utility poles
      -grading challenges
      -trees
      -driveway/parking conflicts
Revised Sidewalk Layout
Cost Escalations
1- ROW takes
2-Driveway tie in costs/temporary easements
3-Drainage requirements
4-SWM impacts
5-Utility Relocation
6-Roadway improvements

Other non-priced impacts: Existing Parking and Tree removal
1-ROW TAKES

Represents permanent ROW takes
necessary for 33’ ROW.

Approximate cost= $42,000
Cost Escalations
• Driveway tie in costs/temporary easements
Example Address: 109
EXISTING FLOW
PATH
Adress:             109
Existing Driveway Width=       31'
Existing Driveway Slope=                        5.80%
Vertical Delta Ex/Pr at ROW=                       1.5
"Grade Chase"=                 33'
CF FILL=                                           670
CY FILL=                                 24.81481481                         37 dollar/CY (import)
 Driveway=                                        1280 SF   Unit Price=    7.34 dollar/SF
Temp easement=                                    2400 SF   Unit Price=       2 dollar/SF
Drainage Considerations=       assume d/w culvert           Total price=   2500 dollars




           Total=                           $17,613.35
Other Driveway Examples:
Cost Escalations
3-Basic Drainage Requirements
Drainage impacts as a result of grading:
(121 Stribling, Sag/ Outfall #1, Upstream inlet)
On Road Drainage as a Result Spread Requirements:
Cost Escalations
• SWM impacts: Quality/Quantity/permanent Easements
Quality:
Quantity:
Proposed SWM Quality
Outfall 1:   Outfall 2:
Outfall 3:   Outfall 4:
Revised Conceptual Outfalls:
Outfall #1
Outfall #2
Outfall #2
Outfall #2
Outfall #2
Outfall #3
Outfall #3
Outfall #3
Outfall #3
Outfall #4
                Outfall 1

Outfall Costs                             130 lf              18" Pipe                94      12220
                                        2600 SF               Easement                    8   20800
                            Cons/E&S-Outfall prot./channel improvements                       20000


                                                                                              53020




                Outfall 2


                                          140 lf              18" Pipe                94      13160
                                        2800 SF               Easement                    8   22400
                            Cons/E&S-Outfall prot./channel improvements                       40000


                                                                                              75560


                Outfall 3


                                          200 lf              18" Pipe                94      18800
                                        4000 SF               Easement                    8   32000
                            Cons/E&S-Outfall prot./channel improvements                       50000




                                                                                              100800




                Outfall 4


                            Further investigation required.




                                                                                              80000




                                                                          TOTAL OUTFALL       309380
Utility Relocation
Utility Relocation
Roadway Improvement Costs
• Reduced for S/W on one side
Other Considerations
 Existing Parking Removed
• Minimally, 21 Spaces (4 on-street, 17 Private)-Eliminated:
Tree Removal
• 19 Trees Removed
?   ?
  Cost Summary:
  Original:                                       Revised Per Analysis:




Total= $1,231,722+(25% Contingency)=$1,539,653   Total= $2,394,385+(20% Contingency)=$2,873,262
Questions ?