Hunnewell Elementary SchoolSD HVAC System SelectionJune 25, 2020

Hunnewell Elementary School

Mechanical System Selection Overview

5 system options studied … 2 systems shortlisted

Energy Modeling and Life Cycle Cost Analysis

Pro/Con analysis

Base System VRF System + DOAS

Option 1 Displacement Ventilation + Radiant Floors + DOASwith Air-Cooled DX CHW/HW

Option 2 Displacement Ventilation + Radiant Floors + DOASwith Geothermal + CHW/HW

Option 3 Chilled Beams + DOASwith Geothermal + CHW/HW

Option 4 Displacement Ventilation + VRF + DOAS

Mechanical Systems

Mechanical Systems Base Option – VRF + DOAS

Mechanical Systems Option 4 – Displacement Ventilation + VRF + DOAS

Radiant Heat

Built-in shelving casework

Heavy duty cover

Radiant Ceiling panels

Mechanical Systems

Mechanical Systems

Hunnewell Elementary SchoolSD Construction Cost Estimate UpdateJune 25, 2020

HVAC system change of est. $2.8m has been factored in*

Refinements during SD

• Building area: Floor Plan development + $ 300k

• Site development + $ 1.5m

• Rubber flooring in lieu of Linoleum + $ 450k

• Foundation Waterproofing + $ 570k

• Schedule impacts due to COVID 19 + $ 500k

Total

$3,320,000

* Assumes VRF/Displacement Air type system

in lieu of Geothermal system

SD Construction Estimate is $2.4m above FS Estimate $45.06m:

• Straightening Café & Gymnasium Structure - $ 0

• Reduce Gross SF by +/-1,000 sf - $ 300k

• Remove 8 operable glazed walls and most sliding glazed doors - $ 500k

• Refine Sloped Roofs (use overhangs and clerestories) - $ 650k

• Reduce/simplify Site design scope - $ 500k

• Eliminate Foundation Waterproofing (awaiting final Geotech investigation results)- $ 550k

• Use Heat Mirror Glazing (at windows) in lieu of triple pane glazing - $ 200k

Total - $ 2,700,000

($300,000 below FS budget)

SD Construction Estimate is $2.4m above FS Estimate $45.06m:

Recommended VE items

Heat Mirror & Triple Glazing

Heat Mirror Film @ all Windows (0.22 assembly U-value – lower weight)

Triple Glazing Assembly: @ all Curtain Wall Units(0.22 assembly U-value)

Recommended VE reductions - $ 2,700,000

($300,000 below FS budget)

Recommended Value adds

• Laminated Glazing at Interior sidelights (in lieu of tempered) + $ 15k

• 4 Clerestory skylights + $ 50k

• Terrazzo flooring at Cafeteria space + $ 100k

• Outdoor Learning classroom @ low roof + $ 75k

• Hybrid Structure (wood roof structure at Café, Media Center, Lobby and Music) + $ 400k

• COVID 19 Schedule Impacts + $ 500k

Total + $ 1,140,000

Increase of + $ 940,000 to FS Construction Budget

Recommended SD Construction Budget: $ 46,000,000

SD Construction Estimate is $2.4m above FS Estimate $45.06m:

DD Value Engineering Goals:

• Water Softening System - $ 70k

• Reduce Roof Screening - $ 55k

• Eliminate Gymnasium divider curtain - $ 25k

Total

- $ 150k

Linoleum in lieu of Rubber flooring: - $ 450k

Not recommended by FMD

Hunnewell Elementary SchoolSD Construction Cost Estimate UpdateDiscussion

Hunnewell Elementary SchoolSD Project Cost & Schedule UpdateJune 25, 2020

Construction Manager Interviews

Anticipated proposals and interviews for the CM Selection Process:*

1. Shawmut Design & Construction

2. Gilbane Building Group

3. W.T. Rich Co.

4. Agostini Construction

* Consigli Co. has withdrawn from the process.

CM Procurement Schedule

• Finalize CM interview questions 6/25

• Construction Manager RFP proposals due 6/26

• CM Prequal Comm review meeting week of 7/6

• Construction Manager Interviews evenings of 7/15 & 7/16

• Construction Manager award 7/20 – 7/31

Schedule Milestone Update

• SD Value Engineering stage 4/24 – 6/18

• Set Schematic Design Construction Budget target 6/25 PBC Mtg – (Note: a few qualifiers to be confirmed after CM completes SD estimate)

• File Project of Significant Impact (PSI) with Town Permitting Authorities on 7/13

• Review FFE & Technology Budget and updated Total Project Budget at 7/23 PBC mtg.

• Start Design Development Phase 8/17

Hunnewell Elementary SchoolThank-YouJune 25, 2020