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Boston Area Projects
Project: Central Artery Tunnel Project / C17A2
Location: Boston, MA
Date: 1996
Contractor: Modern Continental
Excavation: Panel / Diaphragm walls
Conditions: Running sand from old river bed / InstaFreeze application
KB Products: SlurryPro CDP, MPA, LA-1, ProTek 100, WeightIt, SandSeal, InstaFreeze and
InstaFreeze C-2, ImPac
Project: Superstation
Location: Boston, MA
Date: 1996
Contractor: Modern Continental / Obayashi JV
Excavation: Diaphragm Walls
Conditions: Marine Silts, Boston Blue Clay, Till, Rock
KB Products: SlurryPro CDP, MPA, LA-1, WeightIt, ImPac and ProTek 100
Bored Pile - Boston Central Artery/Tunnel Project:
Project: North Station Conversion-Superstation
Location: Boston, MA
Contractor: Modern Continental/Obayashi
Drilling Contractor: The Millgard Corporation
Start Date: 8/97
Complete Date: 10/97
Excavations: 35 caissons, 3 and 5’ dia, avg.depth=100
Equipment: CMV Track
Soil Conditions: fill, clay, glacial till and rock.
Soil Obstructions: Soft silt layers/ 10-30’
KB Products: CDP, ProTek 100, MPA
Slurry Discharge: 40K gal into sewer system under MC/O’s permit.
Project: C19D3, Sturrow Drive Connector Bridge(CA/T)
Location: Charlestown, MA
Contractor: Daniel O’Connell’s Sons
Drilling Contractor: The Millgard Corporation
Start Date: 11/97
Complete Date: 3/27/98
Excavations: 12 caissons, 8’ dia, avg.depth=115, eight of these were done in theCharles River Basin. Equipment: Crane attachment
Soil Conditions: fill, organics(brackish), clay, glacial till and rock. All12 caissons arein the Charles River
Basin.Drilling operations are on land and onbarges.
Special Requirement: Offshore barge project
Soil Obstructions: boulders
KB Products: CDP, ProTek 100, LA-1 MPA
Slurry Discharge: Transferred their fluid o their Leverett Circle project.
Project: C19E1, Leveritz Circle Ramps CA/T # C19E1
Location: Downtown Boston, MA
Contractor: Modern Continental
Drilling Contractor: The Millgard Corporation
Start Date: 5/97
Complete Date: active
Excavations: 91 drilled shafts, 3-6 feet in diam, avg.depth=80,
Equipment: Crane attachment until 9/19. Now 1 crane attachment and 1 track
Soil Conditions: Fill, organics (brackish), clay, glacial till and rock. There are manyobstructions such as
boulders and old wooden pilings.
Soil Obstructions: The soft, sandy, silty clay layer was giving Millgard some troublebecause they were not
keeping viscosities up. Obstructions beingencountered are boulders, wooden pilings and
old granite seawall.
KB Products: CDP, ProTek 100, MPA, LA-1. ImPac
Status: Complete
Project: MWRA /Mass Pike Tunnel –Riser Shafts(access tunnels)
Location: Framingham, MA
Contractor: Atkinson/Traylor/Healy
Drilling Contractor: The Millgard Corporation
Start Date: 1/98
Complete Date: 1998
Excavations: 3 Access shafts, 4.6’ dia, avg.depth=100
Equipment: Crane attachment
Soil Conditions: Fill, glacial till
KB Products: CDP, MPA, LA-1, ProTek 100
Slurry Discharge: Discharged 3K gallons under the site discharge permit.
Project: C09C1 (CA/T), I-90/I-93 Interchange
Location: Boston, MA
Contractor: Modern Continental/Obayashi
Drilling Contractor: NEFCO/AGRA
Start Date: 9/97
Complete Date: 1999
Excavations: 48caissons, 9’ dia, avg.depth =115 and (5) 4’ dia, avg. depth 115’
Equipment: Track
Soil Conditions: Fill, organics (brackish), clay, glacial till and rock.
Soil Obstructions: Old wood pier and granite seawall encountered in several caissons
KB Products: CDP, ProTek 100, MPA, and LA-1
Status: Complete
Project: C09A8 (CA/T)
Location: Boston, MA
Contractor: Kiewit/Cashman JV
Drilling Contractor: NEFCO/AGRA
Start Date: 11/97
Complete Date: 2000
Excavations: 140 Caissons, 3, 4, 5, and 9 ft. Dia., 6000 cubic yds. Five of thesecaissons were done in the
Fort Point Channel.
Equipment: 1 Crane attachment, 1 CMV track
Soil Conditions: Fill, organics (brackish), clay, glacial till and rock.
Soil Obstructions: Site next to Fort Point Channel. Tidal effects, verypermeable/flowing till layer. Neutralized by
use of LA-1
KB Products: CDP, ProTek 100, MPA, and LA-1
Status: Complete
Project: C09A7 (CA/T)
Location: Boston, MA
Contractor: Kiewit/Cashman JV
Drilling Contractor: NEFCO/AGRA
Start Date: 11/97
Complete Date: 7/98
Excavations: 35 caissons, 3,4,6, and 9 ft. dia., avg depth 135’. Deepest 145’ (9’ dia). 18 of these piles
were done in the Fort Point Channel with diameters of 4’-9’. Also: 100-150 feet of trenches,
which have adepth of 23’ right along the Fort Point Channel. Cashman excavated these
trenches.
Equipment: 1 Crane attachment
Soil Conditions: Fill, soil mixed materials, clay, glacial till and rock. 18 of the caissons were in the Fort Point
Channel (seawater). All were completed without problems. Approximately 15 drilled
shafts excavated from a barge.
Soil Obstructions: Site next to Fort Point Channel. Tidal effects, very permeable/flowing till layer and seawater.
Stablized by the use of LA-1 and in some extreme cases the InstaFreeze system was
utilized.
KB Products: CDP, ProTek 100, MPA, InstaFreeze, InstaFreeze C-2 and LA-1
Project: C19B1 (CA/T), Charles River Bridge
Location: Boston, MA
Contractor: Modern Continental
Drilling Contractor: NEFCO/AGRA
Start Date: 5/98
Complete Date: 2000
Excavations: 351 drilled shafts, 3-9’ dia, avg.depth =100
Equipment: 5rigs: 3 track and 2 crane mount
Soil Conditions: Fill, organics (brackish), loose sand layers, clay, glacial till and rock.
Soil Obstructions: Old wood pier and granite seawall encountered in several caissons.Loose flowing sand was
encountered in several drilled shafts so farand the InstaFreeze System was utilized to
stabilize these layers.
KB Products: CDP, ProTek 100, MPA, and LA-1, InstaFreeze C1 and InstaFreezeC2, ImPac
Status: Complete
Project: CA/T Job #C19B8, Gilmore Bridge
Location: Charlestown, MA
Contractor: J.F. White
Drilling Contractor: Trevi/Icos
Start Date: 4/1/97
Complete Date: 3/98
Excavations: 300 drilled caissons 4’ in dia. Avg depth 85’.
Equipment: 1 Crane attachment, 1 track mount
Soil Conditions: Fill, soft sandy silty clay, med. dense clay, glacial till
KB Products: CDP, ProTek 100, MPA, and LA-1
Project: Logan 2000, Fuel Storage Tank
Location: East Boston, MA
Contractor: Bond Bros.
Drilling Contractor: Trevi/Icos
Start Date: 4/15/98
Complete Date: 5/98
Excavations: 5 drilled caissons 5’ in dia and 200’ in depth.
Equipment: 1 Crane attachment
Soil Conditions: Fill, soft sandy silty clay, med. dense clay, glacial till, rock
KB Products: CDP, ProTek 100, MPA, ImPac and LA-1
Project: CA/T Job #, in the Great Basin
Location: South Boston, MA
Contractor: Kiewit
Drilling Contractor: Trevi/Icos
Start Date: 6/98
Complete Date: 8/98
Excavations: 8 drilled caissons 8’ in dia. Avg depth 100’.
Equipment: 1 track mount
Soil Conditions: Fill, hard clay, glacial till into bedrock
KB Products: CDP, ProTek 100, MPA, ImPac and LA-1
Diaphragm Wall - Boston Central Artery/Tunnel Project:
Project: C17A2-State to North Street(CA/T)
Location: Boston, MA
Contractor: Modern Continental/Obayashi
Drilling Contractor: Modern Continental/Obayashi
Start Date: 6/95
Complete Date: 1/98
Excavations: 330K square feet of diaphragm walls
Equipment: 2 clamshells, 1 hydrocutter
Soil Conditions: Fill, clay, glacial till and rock.
Soil Obstructions: 10 ft sand layer at a depth of 40 to 50 feet down on several panels.The InstaFreeze System
was used to stabilize these layers. The obstructions were mainly wood and steel piles,
boulders, old sewerlines and utility lines.
KB Products: CDP, ProTek 100, ProTek 200, MPA, InstaFreeze, InstaFreeze C2,ImPac
Status: Complete
Slurry Discharge: Transferred approximately 100K gal to the Superstation project.
Project: North Station Conversion-Superstation
Location: Boston, MA
Contractor: Modern Continental/Obayashi
Drilling Contractor: Modern Continental/Obayashi
Start Date: 3/96
Complete Date: 10/97
Excavations: 120K square feet of diaphragm walls
Equipment: 2 clamshells
Soil Conditions: Fill, clay, glacial till and rock.
Soil Obstructions: Soft silt layers/ 10-30’
KB Products: CDP, ProTek 100, MPA, and LA-1
Status: Complete
Slurry Discharge: 200K gal directly to the sewer system. Approved by the EPA.
Project: C19E1(CA/T), Leverett Circle
Location: Boston, MA
Contractor: Modern Continental
Drilling Contractor: Modern Continental
Start Date: 4/98
Complete Date: 9/98
Excavations: 20K square feet of diaphragm walls
Equipment: 1 clamshell
Soil Conditions: Fill, clay, glacial till and bedrock.
Soil Obstructions: Porous till layer and very hard bedrock.
KB Products: CDP, ProTek 100, MPA, and LA-1
Project: CA/T # C09A4 Phase 2
Location: Boston, MA
Contractor: Slattery
Drilling Contractor: Trevi/Icos
Start Date: 4/98
Complete Date: 9/98 (in shut down period from 4/98 to 8/98 for jet grouting)
Excavations: Crosswalls35K square feet of diaphragm walls, average length is35’ and depth is 60’. 3K
square feet of sensitive walls. There are four panels right along the foundation of the Mass.
Highway Building, which is about 20 stories high. Four of these panels are complete with no
problems.
Equipment: Clamshells
Soil Conditions: Fill, clay
Soil Obstructions: The pre-trenching and the guidewalls did not match up so the top 20’ was all loose, sandy
topsoil which was the elevation as the water table. This project is located next to the Fort
Point Channel in Boston so the soils and water were brackish.
KB Products: CDP, ProTek 100, MPA, InstaFreeze and LA-1
Status: Complete
Project: North Station / Leverett Circle
Location: Boston, MA
Contractor: Modern Continental
Drilling Contractor: Modern Continental
Start Date: 1999
Complete Date: 4/2001
Excavations: 500K square feet of diaphragm walls
Equipment: 2 clamshells, 1 hydrocutter
Soil Conditions: Fill, clay, glacial till and rock, cross conductivity of sea water. Many of the walls were
constructed within a few meters of active railtracks at North Station.
Soil Obstructions: Various layers of cohesionless sands, clean layers of clam and oyster shells, old sea wall,
brick and rubble were encountered. The KobbleBlok, SandSeal and InstaFreeze Systems
were used to stabilize these layers. Other obstructions were mainly wood and steel piles,
boulders, old sewer lines and utility lines.
KB Products: CDP, ProTek 100, ProTek 200, MPA, InstaFreeze, InstaFreeze C2and ImPac
Status: Complete
Slurry Discharge: Approximately 100,000 gallons discharged to Boston Harbor under proper government
permits.
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