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Clark County, Washington
Environmental Services in Clark County, WA
Environmental site assessments and construction-phase environmental support that keep transactions and projects moving without surprises. Clark County is covered on a project basis through our Seattle, WA regional hub.
- Dispatched from
- Seattle, WA regional hub · project-based mobilization
- Lead time
- Set in the proposal, with mobilization planned around your pour and earthwork schedule
- Laboratory
- Sugar Land, TX laboratory under chain of custody, or a mobile laboratory for large projects
- Reporting
- Reviewed and issued under a documented quality system; formatted for owner, engineer, and building-official review
- Serving
- Clark County, WA — Seattle, Spokane, Tacoma
- Coverage
- Washington statewide · 27 regional hubs
- Technicians
- ACI- and NICET-certified field staff; licensed professionals in Washington
- Call us
- (346) 420-5425
Scope
Environmental services in Clark County
- Phase I Environmental Site Assessments for acquisitions and refinancing
- Phase II subsurface sampling when a Phase I identifies recognized environmental conditions
- Construction stormwater support: SWPPP compliance inspections
- Soil management screening for export and import of fill material
Full scope, standards list, and pricing basis: Environmental Services.
Local conditions
Environmental conditions in Clark County
Clark County sits in a region where rapid growth along the Interstate 5 corridor, proximity to the Columbia River, and Washington State's active environmental regulatory environment create real due-diligence demands for anyone buying, developing, or financing property. Recognized environmental conditions tied to historical agricultural use, light industrial activity, and petroleum storage are common findings across the county, and Washington's Model Toxics Control Act adds a state-law layer that works alongside federal requirements. Our environmental services address those demands directly — Phase I and Phase II environmental site assessments prepared to ASTM standards, plus construction-phase environmental support that keeps grading, excavation, and utility work moving when field conditions raise questions. Coverage in Clark County is dispatched through our Seattle regional hub, with scheduling coordinated to meet your transaction deadlines and project milestones.
Clark County's mix of river-bottom alluvial soils and upland glacial deposits can affect both the mobility of subsurface contaminants and the scope of investigation needed during a Phase II ESA. Washington's wet season, which extends through much of the year in the Portland-Vancouver metro, is a relevant scheduling consideration for any field investigation involving soil borings, groundwater sampling, or site reconnaissance.
FAQ · Clark County
Does Washington State's Model Toxics Control Act change what our Phase I or Phase II ESA needs to cover compared to a standard ASTM assessment?
Washington's Model Toxics Control Act (MTCA) establishes cleanup standards and liability rules that operate independently of federal CERCLA. A Phase I prepared to ASTM E1527-21 satisfies the federal All Appropriate Inquiries rule, but MTCA liability considerations should be discussed with environmental counsel. Phase II sampling and reporting intended for MTCA compliance may need to follow Washington Department of Ecology guidance in addition to ASTM E1903 protocols.
We are permitting a mixed-use development on a former agricultural parcel in Clark County. What environmental concerns are most common on sites with that history?
Historical agricultural properties in southwestern Washington frequently show recognized environmental conditions related to pesticide and herbicide application, on-site fuel storage for farm equipment, and legacy orchard operations that may involve arsenic-based pesticide residues in shallow soils. A Phase I will evaluate those use patterns through historical records and site reconnaissance; a Phase II ESA conducted under ASTM E1903 would include targeted soil sampling to characterize actual conditions before development proceeds.
How does Clark County's proximity to the Columbia River affect environmental due diligence on waterfront or near-river industrial sites?
Sites near the Columbia River may involve shallow or seasonally fluctuating groundwater, which influences how quickly mobile contaminants can migrate and affects Phase II boring and groundwater sampling design. River-adjacent industrial properties also carry a higher likelihood of historical petroleum or solvent use. We design sampling programs to account for seasonal groundwater depth and document hydraulic conditions that could be relevant to Washington Department of Ecology review.
Which office covers environmental in Clark County, WA?
Field work in Clark County is dispatched through the Seattle, WA regional hub, about 137 miles away. Laboratory testing is performed in Sugar Land, TX under chain of custody, or in a mobile laboratory mobilized to large Clark County projects.
Are the technicians you send to Clark County certified?
Field sampling and testing in Clark County are performed by our ACI- and NICET-certified technicians. Environmental engineering and professional services are delivered with professionals licensed in Washington, coordinated under one proposal.
Scheduling & proposals
Need environmental services in Clark County?
Call to schedule a technician, or send project documents for a written proposal.