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Patriot, MA Office Park Development
Back Bay Engineering Group
Consultant: Tetra Tech Rizzo
Project Overview Client: Office Parks, Inc. (OPI) Site Location: Patriot, MA 23.1 acres of wooded land Two 40,000 SF (footprint) office buildings Each building provides 120,000 SF of office space
and contains 3 stories OPI requires:
Concepts Permit Applications and Documents Engineering Documents Cost Effective Design
EXISTING CONDITIONS
Site Boundary
Wetland
Littleton Rd.
Tree LineExisting Structures
Martin St.
Challenges
Grading Existing Elevation Range: 206 – 257’ Minimize Net Cut/Fill
Fulfilling Parking Lot Requirements Large Impervious Area
High Flows of Runoff
Guidelines
Existing conditions plan and wetland delineation
Patriot, MA local Zoning By-Law MA Wetland Protection Act and
Regulations MA DEP Stormwater Handbook ADA Accessibility Guidelines for
Buildings and Facilities (ADAAG) Guidelines set forth in the Request for
Proposal
Three Conceptual Designs
CONCEPTUAL #1
CONCEPTUAL #2
CONCEPTUAL #3
Final Design
Site Layout
Requirements
Grading
Minimize net cut/fill Maximum Slopes:
Driveways: 6.5% Parking Lot:
• < 100’ of Building: 2.0%• > 100’ of Building: 4.0%
Landscape:• 2 to 1 slope (50%) require retaining wall
Grading
Cut/Fill Analysis
Cut/Fill Quantities
Net Cut: 5,560 cy Ledge: 376 cy
http://www.escocorp.com/markets/mining/images/excavator_lg.jpg
Drainage
25 year storm design Determine Drainage Areas Pipe Sizing
Rational Method
Detention Pond Sizing SCS Method
Drainage Plan
Watershed Area
DB - 1
DB - 2
DB - 3
DB - 4
Existing Conditions
Existing Condition
25 Year Storm
Qp = 14.98 CFS
Wetland Watershed - Existing Condition
Detention Basin 1 Profile
Culvert to Detention Basin 2
Detention Basin 1 Hydrograph
Qout Qin
Detention Basin 2 Profile
Qp = 2.12 CFS
Weir to Detention Basin 3
Detention Basin 2 Hydrograph
Qout Qin
Detention Basin 3 Profile
Qp = 12.08 CFS
Culvert to Detention Basin 4
Detention Basin 3 Hydrograph
Qout Qin
Detention Basin 4 Profile
Qp = 13.00 CFS
Culvert to Wetlands Final Qp < Initial Qp
Detention Basin 4 Hydrograph
Qout Qin
Utilities Water
Water for both domestic and fire use is drawn from abutting Martin St.
An 8” PVC line ties into the building for domestic use
A 12” PVC line ties into the building for fire with 6” lines feeding each hydrant
Sewer Wastewater is drained from the site through 8”
PVC pipes utilizing gravity
Utilities (continued)
Electrical Electrical connection to existing line on Littleton Road 4-5” PVC conduits carried in a 2’ duct bank to a transformer on
N.E. corner of site Secondary lines connect to mechanical rooms of each building
Telecommunications Lines connect to utility pole on Martin St. 6-4” conduits carried in a 2’-6” duct bank to each building
Gas A 4” PVC runs to each building from a connection on Martin St.
Construction Cost Estimate
Permit
Massachusetts DEP WPA Form 5 –
Order of Conditions
Recommended