Excavation contractor jobsite in Plymouth County, MA

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Plymouth County, MA Contractor directory

Excavation contractors in Plymouth County, MA

70 verified excavating and site work contractors serving Plymouth County.

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County excavation guide

Ground conditions and project requirements in Plymouth County

Use this local research to understand soil, seasonal constraints, permits, and jobsite logistics before choosing a contractor.

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Soil Regime ProfileEPA Ecoregion 59, 84, 82 (Boston Basin, New England Uplands, Bristol-Narragansett Lowland, Northeastern Highlands)

Massachusetts Glacial Uplands, Boston Basin & Coastal Deltas

Dominant Soil Order: Spodosols / Inceptisols / Histosols / Ultisols
Parent Material: Glacial Till and Drumlin Drift, Glacial Lake and Marine Clay (Boston Blue Clay), and Outwash over Paleozoic Metasediment and Granitic Bedrock

Massachusetts is the densest version of the New England problem: glacial till over Paleozoic rock, boulders in every trench, and the Boston Basin's notorious marine clay. The Boston Blue Clay under the city and inner suburbs (the Drumlin Field, the harbor lowlands) is soft, compressible, and settlement-prone: deep foundations ride on piles, excavations need bracing, and dewatering is routine. The uplands (Worcester hills, the Berkshires, the Pioneer Valley) are thin stony till over schist, gneiss and marble: bedrock ledges on ridge crests, karst in the Berkshire valley marbles, and slopes 20-60 percent in the hill towns. The coastal plain and outwash south (Plymouth, Cape Cod, the islands) is pure glacial outwash: deep, clean, fast-draining sand, trench collapse risk, and the Cape's sole-source aquifer rules that shape every septic design. Hydric soils run 15-30 percent in the lowlands. Shrink-swell is negligible. Frost runs 36-42 inches.

Geographic Footprint:Massachusetts's counties (Boston, Worcester, Springfield, Plymouth) run from Blue Clay basin through stony uplands to pure outwash on the Cape: settlement-prone marine clay in Boston, bedrock-and-karst in the Berkshires, clean collapsing sand on the coast. Boulders appear everywhere.
Geotechnical Baseline

Physical Ground Conditions & Soil Properties

Shallow Bedrock (<50 in)
17.7%of county land area

Moderate rock encounters along ridges and upper slope shoulders.

High Shrink-Swell Clay
0.0%expansive soil

Low volumetric expansion risk in native subgrade.

Median Water Table Depth
4inches from surface

Shallow water table; active dewatering or sumps needed for deep trenching.

Hydric / Wetland Soils
26.3%hydric coverage

Indicates poor natural drainage and potential jurisdictional wetland pockets.

Steep Terrain (Slope >15%)
5.5%of terrain

Predominantly gentle to rolling slopes suitable for wheeled earthmoving.

Septic Severe Limitations
86.1%severe rate

High rate of conventional drainfield limitations; engineered or drip systems often required.

Dominant Soil Textures:Fine sandy loamLoamy fine sandCoarse sand
Surface Stones / Boulders: 6.3% coverage
Compliance & Permitting

Earthwork Regulations & Permit Thresholds

Stormwater & Erosion Control
EPA Region 1 NPDES Construction General Permit (federal; Massachusetts is not delegated, EPA permit number MAR1 not confirmed in sources); covers land disturbance of one acre or more and smaller sites in a larger common plan. State WM15 only if near Outstanding Resource Waters. Local Wetlands Protection Act/Stormwater Standards may also apply.

Administers NPDES stormwater discharge coverage for land-disturbing construction activities.

State Threshold:1.00 Acre
Local Threshold:Follows state
Onsite Wastewater & Utilities
Local Board of Health

Jurisdiction over septic tank permits, soil evaluation perk tests, and drainfield sizing.

Housing on Septic:20.0%
Soil Evaluation:State-certified soil evaluator runs deep observation hole and percolation test; board of health must witness; towns may add requirements
811 One-Call Requirements
Dig Safe (Massachusetts 811)

Mandatory notice window: 72 hours prior to mechanized earthwork (excluding weekends and legal holidays).

Licensing & Clearing Permits
Weather & Ecology

Seasonal Constraints & Clearing Windows

Frozen Ground Days
0days / year

Typical days with sub-freezing soil conditions affecting digging.

Supply Chain & Hazards

Logistics, Aggregate Sources & Geohazards

Aggregate & Material Supply
Jacks Folly

Nearest active quarry: 2 miles haul distance.(55 active crushed stone/sand operations within 50 miles).

Flood & Hazard Overlay
FEMA 100-Yr Flood:19.9%(100% NFHL digital map coverage)
NWI Wetlands:50.1%jurisdictional coverage
Karst Terrain & Sinkhole Risk: Low

0.0% of county underlain by soluble carbonate rock formations.

HUC8 Primary Watersheds:Charles, Narragansett, Cape Cod
Public conservation land: 26.1% (USGS PAD-US).

Area-specific FAQ

Do I need to call before digging in Plymouth County?

Yes. You should contact Dig Safe Massachusetts at least 3 working days before any digging so underground lines can be marked.

How deep do footings need to be in Massachusetts?

In Massachusetts, footings typically need to extend below the frost line, which is around 48 inches here. A local contractor will confirm the code requirement for your site.

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Excavation contractors serving Plymouth County

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