Our engineering staff offer a full range of services for your project’s geotechnical and environmental needs.

Geotechnical Engineering

STL offers comprehensive geotechnical engineering to architects, developers, municipalities, government agencies, etc. Our engineering department consists of professional and staff engineers, geologists, and technicians familiar with the area geology and environment. Our engineers and drilling crews are certified under the OHSA 40-hour training for hazardous material.

Our drilling equipment consists of two truck-mounted drilling rigs capable of drilling and rock coring to a depth of approximately 300 feet using hollow-stem augers, wash borings, and/or casing advancers and are equipped with wire line and automatic sampling hammers. STL abides by strict schedules of maintenance for all rigs and can assure our clients that our field crews rarely experience equipment breakdowns in the field.

Services Include:

  • Specification preparations and review
  • Geotechnical, geological, and hydrologic studies
  • Detailed site investigations
  • Site grading specifications
  • Drilling and sampling (rock and soil)
  • Slope indicator installation and monitoring
  • Underpinning and soils stabilization
  • Foundation inspection (footings, caissons, piles)
  • Structure performance monitoring
  • Construction sequence evaluation
  • Dewatering systems design
  • Borrow availability inspections
  • Dam safety inspections
  • Soil laboratory testing
  • Pavement design
  • Preliminary site studies
  • Site development studies
  • Unique physical evaluation
  • Shoring and bracing design
  • Erosion control design
  • Slope stability analysis
  • Subgrade inspection
  • Foundation recommendations
  • Pile and drilled pier load testing
  • Groundwater monitoring
  • Evaluation of proposed borrow
  • Earth dam design
  • Grout injection studies
  • Compaction test strip evaluation
  • Failure investigation analysis
Environmental Engineering

STL offers comprehensive environmental consulting and testing services to companies, individuals, and municipalities. Such services include Phase I and II environmental site assessments, assisting in the selection and coordination of the work of remediation contractors, asbestos inspection, mirco purse groundwater sampling, sediment control inspection, landfill closure quality assurance, radiological assessments, UST and RCRA closures, and facility investigation.

Utilizing the full resources of our testing equipment and experienced environmentalists, geologists, and engineers, STL is committed to providing the highest quality of environmental consultation.


Services Include:

Phase I Environmental Site Assessment

  • Provide a historical review of the subject and neighboring sites
  • Obtain building, fire, and environmental records to uncover any violations
  • On-site observation to verify the presence of underground storage tanks and whether past or present owners have stores, created, or discharged hazardous waste
  • Provide comprehensive reports to clients. Any uncovered “red flag” trouble areas could lead to Phase II environmental site assessment

Phase II Environmental Site Assessment

  • Provide field sampling of waste, soil, and groundwater to identify suspected contaminants by STL’s crews and engineers who are certified under the OSHA 40-hour HAZWOPER training program
  • Provide analytical laboratory results
  • Provide comprehensive site assessment reports to the client

Asbestos Inspections and Asbestos Abatement Supervision

STL has Ohio Department of Health licensed asbestos hazard evaluation specialists and an asbestos hazard abatement specialist to service asbestos projects.

Asbestos Inspections and Asbestos Abatement Supervision

STL has a Certified Professional in Erosion & Sediment Control (CPESC) and Certified Erosion, Sediment, and Storm Water Inspector (CESSWI).

Additional Services

  • Assist in selecting and coordinating the work of remediation contractors
  • Micropurging groundwater sampling
  • Landfill closure quality assurance
  • Perform underground storage tank (UST) closure assessment and site assessments
  • Radiological assessments
  • RCRA closures and facility investigation
  • Environmental monitoring
  • STL has environmental staff certified by the Ohio EPA Voluntary Action Program (VAP)