Complete civil packages for utility solar near Marthasville, MO: clearing, mass grading, access roads, collection trenching, SWPPP, fencing, and substation civil.
Backwell contracts complete civil site work packages for utility solar EPCs building near Marthasville in Warren County, Missouri. One contract covers clearing through final stabilization, with Backwell field leadership on site.
Down on the Missouri River bottoms along Route 94 and the Katy Trail corridor, this is the flat open acreage in the county. Access is off secondary routes with weight posted bridges, so heavy haul routing needs to be checked before mobilization.
Publicly reported utility-scale solar in and around Warren County:
Project details come from public filings and reporting and are listed to show where the work is. Backwell is not affiliated with these projects or their developers.
Warren County is a thick loess cap over dissected uplands that drop hard to the Missouri River floodplain along its southern edge at Marthasville, Dutzow, and Treloar. The ridges and backslopes are dominated by Menfro silt loam, deep, well drained, and moderately permeable loess, with Winfield on the smoother positions and cherty limestone residuum soils showing up where the bluff slopes cut down to rock. The Missouri bottoms behind the levees are young alluvium, Haynie and Blake type silt loams on the natural levee positions and sandier Sarpy material closer to the river chute. Limestone under the loess produces localized karst features and springs along the bluff line, and the bottom ground carries a shallow seasonal water table controlled by river stage.
Two very different builds in one county: bottomland work where subgrade is soft, the water table is river driven, and you need mat or rock haul roads plus dewatering for trenching, and upland work in loess where the material handles beautifully in a cut but erodes catastrophically if you leave it bare. On the loess, keep disturbed area small, seed and blanket in phases, and use rock check dams and sediment traps at every draw because sheet flow concentrates fast on those long backslopes. Watch for karst on the bluff belt: a sinkhole or a void found during grading changes both stormwater design and pile or foundation assumptions, so plan on additional borings along the rock line rather than a uniform grid.
Full detail on the Warren County market is on the Warren County solar civil page.
We price the package as one scope under one contract, so the EPC has a single point of responsibility for the civil critical path instead of managing separate clearing, earthwork, and utility subcontracts.
Backwell superintendents, project managers, and lead operators run every site. We mobilize company equipment for the core scope and scale each project with leased production fleets, qualified regional subcontractors, and agency-placed field staff, all under Backwell supervision and a single contract.
Contractor licensing. Missouri has no statewide general contractor license and no state commercial building license, so there is no single state card to pull for civil sitework. Licensing and registration are handled at the city and county level, and the requirements vary: larger jurisdictions such as Kansas City, the City of St. Louis, St. Louis County, and Springfield require local contractor registration or a business license, while many rural counties that host solar sites have no contractor licensing at all. What rural solar counties do require is land use approval, typically a conditional use permit or special use permit from the county commission or planning and zoning body, plus a road use or haul route agreement with the county highway department. Practical qualification for a solar EPC in Missouri therefore turns on insurance limits, experience modification rate, equipment fleet, and prequalification packets rather than a state license number.
Construction stormwater. Construction stormwater in Missouri is permitted by the Missouri Department of Natural Resources, Water Protection Program, through a Missouri State Operating Permit for land disturbance issued under the Construction or Land Disturbance Master General Stormwater Permit, permit number MORA00000. Coverage is required for any construction activity disturbing one acre or more, or disturbing less than one acre when it is part of a larger common plan of development or sale that will cumulatively disturb one acre or more. The core requirement is a Stormwater Pollution Prevention Plan, or SWPPP, with site specific best management practices to limit soil exposure, erosion, and pollutant discharge. Note that the MO-R100000 area wide land disturbance general permit is a different instrument, available only to a city, county, state or federal agency, or other governmental jurisdiction, and is not the permit a private solar project or its contractor uses. Source: https://dnr.mo.gov/water/construction-or-land-disturbance-master-general-stormwater-permit-mora00000 Backwell carries the SWPPP scope, installs and maintains the controls, keeps the inspection log, and closes the permit out with final stabilization.
Prevailing wage. Federal Davis-Bacon prevailing wage rates apply on their own terms through the Inflation Reduction Act: solar projects with a maximum net output of 1 MW AC or greater must pay Davis-Bacon prevailing wages to laborers and mechanics and meet apprenticeship labor hour and ratio requirements in order to claim the full value investment or production tax credit. Essentially every project on this list clears that 1 MW threshold, so certified payroll and apprenticeship tracking should be assumed on all of them. On top of the federal requirement, Missouri has its own state prevailing wage law under Chapter 290 of the Revised Statutes of Missouri, administered by the Missouri Department of Labor and Industrial Relations, Division of Labor Standards, which issues annual wage orders by county and occupational title. The state law reaches public works construction for a public body, so privately owned developer solar is generally outside it, but work for a municipal utility, a public power district, or any publicly owned or publicly funded portion of a project can trigger state prevailing wage and state certified payroll on top of the federal obligation. For projects claiming the full ITC or PTC, Backwell produces Davis-Bacon certified payroll, pays the applicable wage determination, and supports apprenticeship labor-hour compliance.
All Missouri solar civil work or the national utility solar civil page.
Send plans, a scope of work, and the schedule through the form below or call (315) 400-2654. We review the civil package, walk the site if it is at that stage, and return a scoped proposal with a schedule of values, stated fill allowances, and unit rates for overages. A one-page capability statement is available for prequalification files.
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