Mighty Arm Excavation, LLC is a licensed, bonded and insured erosion control contractor carrying TESC for Greater Seattle GCs and developers, with workmanship warranted one year from substantial completion. We install and maintain the BMPs on your TESC plan under your stormwater permit and SWPPP.
Temporary erosion and sediment control (TESC) is part of our earthwork services, and we carry it as its own line item whether it's bid alone or with site preparation. The work covers the BMPs that hold sediment on site, from perimeter controls and construction entrances to inlet protection, dewatering and cover on exposed soil. Our erosion control services run from the preconstruction plan review through maintenance, removal and final stabilization.
BMPs go in to the TESC plan, are maintained on the schedule the contract sets and are documented with photos for the GC's file. That is the standard we hold as an erosion control contractor, on standalone TESC bids and on sites where we also carry the dirt work.
BMPs installed to the TESC plan and the SWPPP prepared for the site
Photo documentation and records handed to the GC for their file
CSI Division 31 scope: 31 25 00 Erosion and Sedimentation Controls
Each card is a construction erosion control measure we self-perform, sized to the TESC plan and the site's disturbed area.
Silt fence installation with a slicer along perimeters and down-slope edges, repaired as needed through the maintenance term.
A stabilized construction entrance of quarry spalls at site access points, with rock refreshed as it loads up with sediment.
Wattles staked across slopes and along contours to slow runoff and catch sediment before it can leave the disturbed area.
Storm drain inlet protection on the catch basins and inlets the work affects, cleaned out and replaced as sediment builds up.
Baker tank supply and setup to hold and settle sediment-laden water before it is filtered and discharged where authorized.
Construction dewatering with pump setup and monitoring, sediment bag filtration and coordinated discharge authorizations.
TESC goes on our bids as its own scope, priced apart from the excavation budget.
Track Record
Projects delivered company-wide across Greater Seattle, private and public.
Our own people install and maintain every BMP we bid, with no second sub in between.
Silt fence slicer, baker tanks, pumps, filtration, sweeper, and wattles, fabric and spalls in stock.
TESC runs with dedicated crew, backed by excavation crews cross-trained to support it.
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Workmanship warranted one year from substantial completion, with stated exclusions.
The scope moves through plan review, installation, maintenance and closeout.
SEE OUR FULL PROCESS
We review the TESC plan and SWPPP, walk the site to verify the BMP layout, flag conflicts between the plan and actual conditions, and coordinate the preconstruction meeting with the jurisdiction.
Perimeter controls go in before any ground disturbance, along with the construction entrance and inlet protection on the affected structures.
Scheduled and storm-event BMP checks drive repair and replacement, sediment removal, entrance rock refresh and street sweeping as needed.
Once the site is stabilized, we remove the BMPs, complete the final cleanup and hand the records to the GC.
The real test of a sub is whether a GC calls you for the next job. Here's what the contractors and developers we work with have to say.
From 220+ Google reviews
From offices in Bellevue, Seattle and Granite Falls, we carry TESC within a 50 to 70 mile radius of Seattle, from Tacoma to Bellingham and east to North Bend. Local TESC requirements vary by jurisdiction and sit alongside Ecology’s permit, and we work under those of Seattle (SDCI and SPU), King County, Bellevue, Snohomish County, Tacoma and the other jurisdictions across that range.
Seattle
Bellevue
Tacoma
Everett
Lynnwood
Bellingham
Granite Falls
North Bend
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Home base & primary coverage
Beyond the six core BMPs, we install the measures that route and settle runoff, cover exposed soil and keep sediment off the street.
On our projects, the GC or owner holds the stormwater permit, and we work under it as the erosion control contractor.
We work under the GC's CESCL, the certified lead who conducts the site inspections the permit requires.
West of the Cascades, the wet season runs October 1 through April 30, and the permit cuts the time exposed soil can sit unworked from 7 days to 2.
Our dewatering scope covers the tanks, pumps and filtration that handle sediment-laden water, plus the discharge coordination before it leaves the site.
TESC can be bid as a standalone scope or bundled with our excavation services or site prep work.
TESC work runs to the project safety plan, with added controls where it meets the street or a structure.
As an erosion control contractor, we price TESC as its own line item rather than folding it into site prep, so your estimator can see it separately. We don't quote it as a percentage of the sitework contract, because that share varies too much from one site to the next.
Our TESC work runs on private and public sites, including multi-acre sites that require CSWGP coverage. We've carried TESC on 4 acres of disturbed ground, and we can take on considerably larger sites.
Answers to what contractors and developers most often ask before bringing us onto a project.
Mighty Arm prices TESC per project as its own line item, and it doesn't publish a percentage benchmark because the share of a sitework contract varies too much from site to site. The price depends on disturbed acreage, project duration, season of construction, slope and soil type, proximity to receiving waters or critical areas, jurisdiction and inspection frequency, dewatering requirements, and the number of inlets and entrances.
Mighty Arm self-performs the BMPs it bids, from silt fencing, construction entrances and inlet protection to sediment traps, baker tanks, dewatering, wheel wash, street sweeping and concrete washout containment. It can install and maintain them for the project duration, as a standalone scope or bundled with its excavation and site prep work.
Mighty Arm takes on wet-season starts and gives the GC its recommendations before work begins. A start between October 1 and April 30 raises project costs, since wet-season work means more soil export and import and potentially more TESC cost.
Mighty Arm works under the GC's CESCL, the certified lead that Ecology's construction stormwater permit requires for site inspections. It keeps the BMPs on the CESCL's weekly and post-discharge schedule, completes the corrective work those inspections call for, documents it with photos and hands the records to the GC.
On Mighty Arm's projects, the GC or owner holds the Construction Stormwater General Permit, and Mighty Arm works under it and implements the SWPPP the engineer or GC prepared. Coverage applies to sites disturbing one acre or more that discharge to surface waters, or smaller sites in a larger common plan of development or sale.
Mighty Arm takes over maintenance on sites another contractor installed, and it responds when a site fails inspection. Maintenance runs for the project duration and is priced at a monthly rate, with storm response on time and materials.
Mobilization for a Mighty Arm TESC install is set by the project schedule and the start lead times, so it varies from project to project. The timing is laid out in the proposal, and perimeter controls go in before any ground disturbance.
TESC workmanship carries Mighty Arm's one-year warranty from substantial completion, with manufacturer warranties on supplied materials passed through to the owner. The warranty covers the supply and installation Mighty Arm performs rather than BMP performance in a given storm, and it excludes damage caused by others, settlement beyond normal tolerances, misuse and changes in site use.
Tell us the project, the start date and who holds the permit. We'll come back with TESC priced out separately and the site assumptions behind it written into the proposal.
Give us the basics and a quick description of the scope. We'll take it from there.
Commercial excavation, site prep, and demolition for general contractors and developers across Greater Seattle.
License: MIGHTAE766QK
UBI: 605-632-469
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