Excavation, site work, and septic systems.

Tree and lot clearing, foundation digs, rock hammering through ledge, drainage, driveways, grading, and hauling. Marc is also a licensed septic installer, so new systems and replacements get done by the same crew already on your site. Straight answers, a written estimate, and work done right the first time.

Land & tree clearing
Foundation & utility digs
Rock hammer & ledge
Drainage & grading
Driveways & roads
Fill, gravel & loam
New septic systems
Septic replacement

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Pipe trench excavation on a Granite State Site Worx job site

What we solve

Whatever the site needs.

Septic system failing?

Licensed installation of replacement septic systems. Marc works with several licensed sewer designers and handles state coordination, then gets it in the ground.

Need a new septic system?

New construction systems built to the designer's plan. Done right, passed the first time.

Drainage problems?

Wet basements, standing water, washouts. Marc will give a free site survey for a solution, then regrade, install drains, and move water where it belongs.

Building a new home?

Complete site work: clearing, foundation dig, utilities, backfill, and finish grading, plus quality well drillers Marc works with regularly.

Need a driveway?

New driveways built to last, plus regrading and repair of ones that haven't.

Ledge or rock in the way?

A hydraulic hammer attachment breaks up rock and shelf. No blasting contractor needed for most jobs.

Lot need clearing?

Tree and brush clearing, stump removal, and haul-off. Raw land opened up and left ready to build on.

Need fill or gravel delivered?

Fill, gravel, stone, and loam delivered, and spread if you'd like.

Near water or wetlands?

Marc works with Shoreland and wetland specialists to obtain the permits and approvals your project needs.

Recent work

Real jobs, photographed start to finish.

Every project photographed, start to finish. Ask us for references. Our customers are our best advertising.

House lot clearing and ledge removal

Culvert and road work, compaction

Marc Longval

Owner & Operator

When you call, you talk to Marc, the same person who shows up with the machine. No sales staff, no runaround. A licensed septic installer with over 25 years of experience in excavation, septic, drainage, and site work, plus the equipment to handle your project from first dig to final grade, including a hydraulic hammer for rock and ledge.

Marc works with homeowners, builders, licensed sewer designers, well drillers, engineers, and Shoreland and wetland specialists across the region. One call brings the whole team.

Service area

Based in Washington, NH

Washington sits in the hills of western New Hampshire, just south of Lake Sunapee. We travel up to about 90 minutes in any direction: north to Lebanon and the Upper Valley, east through Concord, south through the Monadnock region, and west to Brattleboro, VT. If you're anywhere in western or central New Hampshire, or just across the river in Vermont, we'll come to you.

WashingtonHillsboroughSunapeeNew LondonBradfordAndoverNewportClaremontLebanonKeenePeterboroughConcordBrattleboro, VTWest Windsor, VT

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Tell us what's going on with your property. We'll get back to you within one business day.