Managing health, safety, and environmental concerns in the field to ensure regulatory compliance.

Tolunay-Wong Engineers supports our clients’ environmental compliance initiatives, often functioning as an extension of their internal resources for monitoring and maintaining their operations in compliance with the myriad of federal, state, and local environmental regulations.

From field data acquisition to data analysis and data presentation, we take a cradle to grave approach to our clients’ compliance concerns, taking projects from initial concept and planning through to construction closeout and operations and maintenance of residential, commercial, industrial, and governmental facilities. Our environmental field and professional staff are cross-trained to work synergistically with our geotechnical and materials testing divisions, allowing us to provide environmental compliance services more cost effectively and efficiently than obtaining such services through multiple providers. Whether it is consulting or field services for “soft” natural resource management and regulatory analysis projects or “hard” hazardous materials management projects, we have the staff and equipment resources to execute projects that support our clients’ environmental compliance initiatives.



  • Phytotechnologies
  • Monitored Natural Attenuation
  • Groundwater Recovery and Treatment Systems
  • Soil/Sediment Remediation
  • Injection of Biological/Chemical Treatment Agents
  • Recovery Well Installation
  • Single and Multiple Cased Monitoring Well Installation
  • Soil Gas/Vapor Sampling
  • Vapor Extraction Wells
  • Nested and Cluster Well Installation
  • Sparge Point Installation
  • Low Clearance, Angle and Vertical Drilling
  • Drilling Waste Management
  • Well Rehabilitation, Maintenance and Development
  • Undisturbed Sampling
  • Utility Locating Services Using ElectroMagnetic Ground Penetrating Radar and Vacuum Excavation (aka Air-Knife) and Hydro Excavation


  • Monitoring Well Installation
  • Well Plugging and Abandonment (P&A)
  • Soil Sampling
  • Construction Dewatering
  • Sludge Sampling
  • Sediment Sampling


  • Safety Consulting
  • Safety Training
  • Project Safety Services


Confidential Client – TX

TWE has been working with this client at this site for several years. The project involves a geotechnical and environmental investigation to aid in the design and construction phases of a new dock structure. Environmental conditions consisting of buried waste and a groundwater contaminate plume beneath the site are critical factors in this process.

TWE and the design contractor were tasked with developing a plan that would limit the amount of material that would be excavated and be protective for workers during construction. During the construction phase, TWE conducts air monitoring and decontaminates all impacted-equipment, as well as coordinates waste disposal of contaminated material.

URS, LNAPL Recovery

Performed Light Non-Aqueous Phase Liquid (LNAPL) gauging and recovery at the Inter-coastal Terminal site at the Port of Texas City for BP.

BP – North America: C-Plant SAP Flow Study

We initiated a sap flow study on one of the existing groups of pilot test trees in October 2012 to evaluate the transpiration rate on 12 years of growth to further define the stand of trees required to hydraulically control the plume migration in the shallow transmissive zone.

Chemical Process and Production: One Off Disposal

Chemical Process and Production: One Off Disposal Waste Characterization and disposal of drums and tank contents.

GB Biosciences Greens Bayou Sediment Remediation Project, Houston, TX

TWE conducted third party contractor quality assurance monitoring for dredging and placement of sediments contaminated with chlorinated hydrocarbons, including PCBs and pesticides. Key tasks included:

  1. Around the clock, onboard surveillance of dredging contractor’s activities
  2. Contaminated dredge spoils disposal cell effluent sampling and testing
  3. Daily inspections of disposal cell liner and dredge spoils pipeline
  4. Post dredge sediment sampling and analytical testing
  5. Backfill sand thickness measurements
  6. Coordination of client, contractor, and Port of Houston Authority communications
  7. Surveying of dredge prisms and calculation of dredge volumes
  8. Evaluation of laboratory methodologies between client and Port Authority labs for determination of total suspended solids in disposal cell effluent

Metro Light Rail Corridor

Environmental Services:

  1. Turnkey LPST site remediation of contaminated soils;
  2. Monitored natural attenuation and closure of a tank farm with diesel-contaminated groundwater;
  3. LPST remediation contractor quality assurance monitoring;
  4. Development of Voluntary Cleanup Program supporting documents for submission to TCEQ;
  5. Texas Risk Reduction Program and LPST Program documents development;
  6. Waste characterization testing; and
  7. Phase I and Phase II ESAs of commercial and industrial properties along the 30 miles of corridor right-of-ways and terminal facilities.
  8. Litigation Support

Nucor Corporation Facility Consent Decree – Jewett, TX

TWE executed Environmental Protection Agency (EPA) Consent Decree to address releases of heavy-metal and hydrocarbon based Hazardous Waste in various locations. Key tasks included:

  1. The development of Affected Property Assessment Reports (APARs) for areas affected by Electric Arc Furnace (EAF) dust, transformer fluids, crude oil sludge pits, diesel fuel releases, and EAF dust bag-house filters
  2. Execution of Response Action Plans (RAPs) to remediate Affected Properties
  3. Issued Response Action Completion Reports (RACRs) to document closure
  4. Developed Integrated Contingency Plan that included emergency response plans, storm water management plans, and spill response plans
  5. Storm water flow mapping
  6. Conducted third party contractor quality assurance monitoring of the Correction
  7. Action Management Unit cap and annual CAMU cap engineering inspection

Dry Cleaner Remediation Program, State of Texas

The Dry Cleaner Remediation Program (DCRP) establishes a prioritization list of dry cleaner sites and administers the Dry Cleaning Facility Release Fund to assist with remediation of contamination caused by dry cleaning solvents. A closure list has been created to indicate the DCRP sites that have met Texas Commission on Environmental Quality (TCEQ) regulatory standards. The environmental field services department at Tolunay-Wong Engineers, Inc. has been contracted to provide remediation drilling services for the DCRP for the past two years. TWE’s field crews mobilize drill rigs to various sites throughout the state and install monitoring wells for sampling and then plug & abandon the wells post sampling.