Summaries of Typical
Trident Environmental Projects

GPM (Duke) – Northwest Oklahoma
Environmental Site Assessments at Gas
Compressor and Meter Sites

Trident Environmental performed environmental site assessments (ESAs) at 13 gas compressor sites and 50 meter stations in the Anadarko Basin of Northwest Oklahoma.  The investigations were conducted to establish pre-acquisition baseline conditions regarding hydrocarbon impacts to the soil and groundwater from historic operations at each facility.  The results of the investigation were used to calculate costs of corrective action for regulatory closure based on applicable Oklahoma Corporation Commission (OCC) guidelines.

The gas compressor sites contained a variety of equipment configurations, operational standards, and levels of maintenance within a wide range of geographical and hydrogeological settings.  Consequently, an interpretation of site-specific environmental sensitivity was included based on local topography, soil types, geology, and potential man-made exposure pathways.

Trident was successful in quickly and efficiently identifying site operations and equipment that represented potential environmental concerns, evaluating those concerns by intrusive sampling, and determining the costs for additional assessment, risk evaluation, remedation, and regulatory closure.  The primary deliverables to GPM were detailed cost evaluations representative of several likely regulatory scenarios, characterization data (ESA reports) upon which the cost evaluations were based, and continuous support of the Trident Project Manager for consultations during the acquisition costs negotiations.

The information generated from the project led to a fair settlement of environmental costs which are currently being utilized to bring the purchased compressor stations into regulatory compliance.  Additional corrective actions conducted by Trident include the following:

• Completion of Risk-Based Assessment Reports to identify sites for regulatory closure and establish target clean-up levels for sites requiring remediation.
  
  

• Regulatory closure of sites through soil leaching modeling to verify the future protection of the groundwater.
  
  

• Performance of groundwater monitoring to verify plume stability and justify regulatory closure.
  
  

• Remedial action to recovery phase-separated hydrocarbons.

Navajo Refining – Southeast New Mexico
Groundwater Remediation System

Navajo Refining Company retained the Trident staff to design and install a remediation system at a refinery in southeast New Mexico. A break in a desalter line caused a release of residual petroleum hydrocarbons within the vadose zone, separated-phase hydrocarbons (free product) on the water table, and dissolved-phase hydrocarbons in the groundwater.  Because of the existence of numerous municipal water supply wells near the site, an aggressive remediation system was designed and installed.  The remediation system consists of eight air sparging/soil vapor extraction (AS/SVE) wells and one groundwater recovery well for source removal.  The system focuses on aggressive physical removal while simultaneously stimulating naturally-occurring hydrocarbon degrading bacteria.

The soil vapors extracted by the AS/SVE system are conveyed to the refinery boiler system were gas combustion takes place.  To monitor the performance of the AS/SVE system, monthly air samples of the SVE exhaust are obtained and analyzed for BTEX (EPA Method 8021) and total petroleum hydrocarbons (EPA Method 8015M - Gas Range).  After two years of continuous operation, the system recovered an estimated 19,100 kilograms (8,700 lb.) of total volatile hydrocarbons (TVHC).  In addition, dissolved-phase hydrocarbon concentrations declined significantly in the downgradient monitoring wells.  This decrease is attributed to the successful performance of the AS/SVE system.

During the first year of operation, total fluids (groundwater and phase-separated hydrocarbons) were pumped from the recovery well to the refinery desalter unit where the free product was recovered by an electrostatic oil/water separation process along with other refinery discharge water.  The recovered water then underwent a steam stripping process prior to be being released into the local publicly owned treatment works (POTW).  After 15 months of continuous operation, approximately 700,000 gallons of total fluids were removed from the source area.  Decreases in product thickness measurements in monitoring wells located near the source area are attributed to the successful removal of free product from the recovery well.  After 15 months, the total fluids recovery system, which consisted of a 3/4 horsepower submersible pump in the recovery well, was replaced with a product only recovery system.  This upgrade was conducted to increase efficiency of recovering free product and to provide a more accurate accounting of product recovery volumes.  Since the existing AS/SVE system had proven to be very effective at removing the dissolved hydrocarbons, groundwater recovery with a submersible pump was no longer necessary.  After nine months of operation, the pneumatically operated product recovery pump recovered over 110 gallons of free product.

Based on the results of the initial performance of the remediation system, groundwater cleanup is expected to be completed within one to two years.

GPM (Duke) – Texas Panhandle
Environmental Site Assessments
at Gas Compressor Sites

Trident personnel performed environmental site assessment (ESAs) at 27 gas compressor sites in the Anadarko Basin of Texas.  The investigations were conducted to establish pre-acquisition base-line conditions regarding hydrocarbon impacts to the soil and groundwater from historic operations at each facility.  Cost calculations for additional assessment and remediation were determined and utilized in the purchase price negotiations.  Investigation methodologies and recommendations for further assessment or remediation were based on a detailed understanding of all applicable state and Federal regulations specific to each site location and operation.

The gas compressor sites contained a variety of equipment, configurations, and operations within a range of geographic settings.  Consequently, an interpretation of site-specific environmental sensitivity was conducted for each station based on local topography, drainage relationships, soil types, geology, and hydrology.  Potential man-made receptors, such as water wells and surface impoundments, were also noted and evaluated in light of the risk to human health or livestock.

During the course of the investigations Trident used our significant experience in quickly and efficiently identifying the site operations that represented potential for environmental concern.  In addition to the present site operations, Trident personnel located and assessed historic or reclaimed sites (such as former burn pits, petroleum storage areas, and equipment placements) that have the potential for subsurface hydrocarbon impacts, but are not readily apparent based on surface observations.

Of the 29 investigated sites, various levels of hydrocarbon impact were encountered, including:

• Sites with hydrocarbon impacts to the soil that were below the expected regulatory target concentrations and would likely achieve closure status without further assessment
  
  

• Sites with significant but defined hydrocarbon impacts to the soil, requiring some minor remediation or negotiated (risk-based) closure approval from the state regulators
  
  

• Sites with deep hydrocarbon impacts to the soil that represent a threat or impact to the groundwater that require soil remediation and, possibly, groundwater monitoring or remediation prior to achieving closure status
  
  

• Sites with significant hydrocarbon impacts to the soil and groundwater requiring remediation planning, negotiations with the regulators, and, possibly, negotiations with the surface owners

GPM (Duke) – Southeast New Mexico
Natural Attenuation

Trident Environmental personnel were contracted to prepare a remedial strategy work plan to address dissolved hydrocarbons in the unconfined alluvial aquifer (Ogallala Formation) underlying several gas plant facilities in southeast New Mexico.

Based on current and future land uses, the lack of potential receptors, and historical water quality data, it was concluded that there is low risk with respect to exposure to human health and the environment from the hydrocarbon-impacted groundwater on site.  Therefore, monitoring the efficacy of natural attenuation by sampling the existing monitoring wells on site was chosen as the most practical method for site remediation.

The data collected to date demonstrates that the hydrocarbon-impacted soil and groundwater associated with the site is contained well within the fenced property boundaries.  It is apparent that natural attenuation processes have been effective in stabilizing the plume and preventing continued downgradient migration due to the estimated age of the release, groundwater velocity, and limited extent of the plume.  With the continuation of natural attenuation, the dissolved hydrocarbons will be reduced and dissipate to background levels as long as there is no additional source of hydrocarbons introduced on site.

Through periodic sampling and monitoring of groundwater conditions, the status of plume migration or recession will be determined.  Analytical results of pertinent parameters such as benzene, toluene, ethylbenzene, xylenes (BTEX), and electron acceptors (dissolved oxygen, nitrogen and sulfate) will be used to make these conclusions.  As site conditions change with time, recommendations will be made with respect to continued monitoring, monitoring frequency, and/or site closure.

The New Mexico Oil Conservation Division (NMOCD) agreed with a request to reduce the sampling and monitoring frequency from quarterly to semi-annually until the plume finally meets remediation goals.  After each year of monitoring, the data will be evaluated to confirm that the benzene plume is not migrating downgradient and document the progress of intrinsic remediation.  If the data confirms that the plume is not migrating and that benzene concentrations are not increasing, then site closure will be requested.

Duke Energy – East Texas
Mercury Characterization and Remediation

Trident Environmental personnel were retained by a major natural gas gathering company to characterize the extent of mercury-impacted soils at approximately 37 gas meter sites within a natural gas gathering system and in the crawl space beneath a gas plant office building in east Texas.  Mercury manometers had been used at most of the gas meter sites for gas flow measurement purposes.  During the 1970s the mercury meters were replaced by air diaphragm-type meters and stored in the crawl space of the office building.  Based on the results of the sampling investigation it was determined that approximately four meter sites and the crawl space would require remediation.

Based on the characterization results, a remediation work plan was written to comply with applicable Resource Conservation and Recovery Act (RCRA) requirements and detailed the field testing procedures to measure mercury content in soils, sampling protocols, remediation procedures, and specifications for treatment and disposal options.  After approval of the work plan by the Railroad Commission of Texas (RRC), excavation, treatment, and disposal of the impacted soils was implemented.

After using heavy equipment (backhoe) and hand shovels to excavate approximately 18 cubic yards of soil from the four meter sites, the locations were restored to mercury concentrations of less than 20 milligrams per kilogram (mg/kg).

The crawl space presented a bigger challenge because it was a confined space. Thirty-two mercury meters were removed from the crawl space and sent to a recycling facility in Minnesota.  Mechanical excavation of the crawl space was not feasible due to the limited work space.  A combination of hand shoveling and a heavy-duty industrial vacuum was used to remove the mercury-impacted soil.  Since the crawl space is a confined space area, confined space permit procedures were followed, as detailed in the health and safety plan.  Safety procedures included the use of supplied air respirators for the two workers involved in the remediation of the crawl space.   An industrial vacuum generating head mounted on a 55-gallon drum powered by a 185 cubic feet per minute air compressor was used to vacuum the loosened soil.  Hand excavation and vacuuming of soil beneath the crawl space was performed until bedrock conditions were encountered.  As a precautionary measure, a mercury vapor suppressant and decontamination liquid was sprayed on the floor of the crawl space after excavation and vacuuming operations were completed.

Remediation activities performed in the crawl space were successful in the following:

• Removing all visible mercury
  
  

• Reducing total mercury concentrations to levels below 45 mg/kg
  
  

• Reducing mercury vapor concentrations to levels below 0.025 milligrams per cubic meter (mg/m³) (the threshold limit value established by the American Conference of Governmental Hygienists)

Since operational considerations, bedrock conditions, and the client’s requirement that the building remain in place made it infeasible to remove additional material from the crawl space with mechanized equipment the 2 mg/kg target cleanup level could not be achieved.  Therefore, the following remedial actions were proposed to the RRC to insure the protection of the commercial workers who utilize the office space:

• Limited entrance into the confined space to only necessary utility repairs or other emergencies. Such entrances should only be made while following confined space entry.  Permitting procedures until the area is determined to be safe (mercury vapor analyzer [MVA] readings below 0.025 mg/m³).  Keep entrance to crawl space locked and posted with a sign labeled: CONFINED SPACE – ENTER BY PERMIT ONLY
  
  

• Apply additional mercury vapor suppressant to the crawl space floor such that it suppresses any residual mercury vapors
  
  

• Conduct quarterly MVA surveys inside the office building to ensure worker safety
  
  

• Conduct quarterly MVA surveys of the crawl space for one year to ensure mercury vapor concentrations are below 0.025 mg/m³ and determine any trend relationships of MVA data over time
  
  

• Following discontinuation of the use of the office building, develop a work plan for removal of the building and excavation of the soils containing residual mercury using heavy equipment, similar to the methods used at the meter sites

It was determined that there is low risk to potential exposure to mercury at the four meter sites since target cleanup levels were achieved and there were no documented sensitive receptors within ¼ mile of the sites.  Therefore, a request was submitted to the RRC to acknowledge that no further corrective action is warranted at these sites.

G E Engine Services – Winfield, Kansas
Phase I & II Environmental Site Assessment &
Compliance Audit at Large Manufacturing Facility

Trident personnel performed a Phase I and II Environmental Site Assessment (ESA) which included a Compliance Audit of a 415,000 square foot manufacturing facility in Winfield, Kansas.  The investigation was conducted to establish pre-acquisition baseline conditions regarding facility compliance issues, potential chemical impacts to the soil or groundwater, and the historic health and safety record for workers at the plant.  The results of the investigation were used to determine the applicability of existing facility systems (waste storage, treatment, manufacturing, etc.) as related to future utilization by the new owner.

The building and property contained a wide variety of equipment used in the manufacturing, storage, packaging, and shipping of the product.  In addition, systems were present for the bulk storage of hazardous and non-hazardous materials (liquids and solids), on-site treatment and disposal of liquid waste streams, storage and shipment of hazardous and non-hazardous solid waste, and environmental monitoring.

The Phase I/II ESA portion of the evaluation included the installation of three monitoring wells associated with underground fuel and bulk material storage tanks.  Surface (wipe) sampling of structures and equipment was conducted to determine the potential for contamination from airborne metals (dust) and other chemicals associated with the historic manufacturing processes.

The Compliance Audit portion of the evaluation required the completion of a 76-page, 300-question checklist, which covered all aspects of facility operations, regulator oversight, waste handling (including off-site disposal), monitoring, and employee safety.

Duke Energy – Permian Basin
Characterization and Management of Non-hazardous
Oil Field Waste at Various Gas Processing Facilities

Trident has performed general waste characterization and disposal management services for Duke Energy Field Services at several gas processing facilities in the Permian Basin.  Although many of the facilities were similar operationally, a wide variety of solid waste types and disposal scenarios were encountered due to recent facility upgrade and construction activities.

Characterization and management of the waste included a determination of source, soil and materials sampling, review and selection of disposal options, permit preparation, manifesting, and disposal oversight.  Following the completion of disposal events a brief report was prepared, when required, to document the waste characterization data and final disposition.

Chevron Pipe Line – Permian Basin
Phase I Environmental Site Assessment and Limited
Compliance Audit of a Major Crude Oil Gathering System

Trident personnel performed a Phase I Environmental Site Assessment (ESA) and Limited Compliance Audit of the West Texas Gathering System operated by the Chevron Pipe Line Company.  The investigation was conducted at the request of Chevron to provide due diligence information for potential pipeline system buyers.  The results of the investigation were used to demonstrate the current condition of the system with respect to potential environmental liability and document the spill history.

The West Texas Gathering System consists of eight major tank farms with approximately 50 field booster pump stations and hundreds of miles of crude oil pipeline.  Each facility included equipment for crude oil storage, transfer pumps, pigging connections, sumps, chemical storage, electricity transmission, solid and liquid waste storage, and areas of hydrocarbon impact to the soil.

The Limited Compliance Audit portion of the investigation required the review and documentation of permits and exemptions associated with storm water, solid waste, and air emissions.  In addition, a database of release report information from operator and regulatory files were evaluated to identify higher risk sections of the pipeline and demonstrate the effect of recent efforts to upgrade the system.

Farstad Fractionation Plant – Midland, TX
Phase I Environmental Site Assessment and Limited
Compliance Audit of a Gas Fractionation Facility

Trident personnel performed a Phase I Environmental Site Assessment (ESA) and Limited Compliance Audit of a 47-acre gas fractionation plant in Midland County, Texas.  The investigation was conducted at the request of Duke Energy Field Services to establish baseline conditions regarding facility compliance issues, and potential chemical impacts to the soil, groundwater, or structures at the plant.  The results of the investigation were used to calculate the potential liability associated with the acquisition agreement.

The buildings, equipment, and property included railroad and truck loading stations, aboveground liquid hydrocarbon storage tanks, treatment and processing equipment, aboveground piping, a quality control laboratory, and a full service truck fueling and service center.  The facility process and maintenance systems involved the storage of non-hazardous bulk materials and the generation of non-hazardous wastes.

The Limited Compliance Audit portion of the evaluation required the review and documentation of permits and exemptions associated with storm water, solid waste, and air emissions.  Historic soil and groundwater monitoring samples, associated with a former underground storage tank, were also reviewed to verify compliance with closure directives.

Santa Fe Resources – West Texas
Electromagnetic Conductivity Survey

Trident Environmental personnel conducted an electromagnetic conductivity (EM) survey at an oil field for Santa Fe Resources in west Texas.  The survey was completed prior to a property transfer to determine if a substantial environmental liability was present regarding high chloride and sulfate levels reported in area water wells.  Since the oil field covered an approximately 2 mile by 3 mile area, the EM survey provided a very cost effective method to identify potential sources of dissolved chlorides and sulfates in the shallow groundwater table over a large investigative area.  Also, the EM survey eliminated the need for any extensive groundwater monitoring well installation and sampling operations.

A Geonics model EM34-3 electromagnetic conductivity meter was used to measure apparent ground conductivity values at approximately 1,000-foot spacing across the entire oil field.  The EM survey was conducted to measure conductivity values and qualitatively correlate these values with available groundwater quality data.  This correlation was used to determine potential sources of the high chloride and sulfate concentrations observed in area water wells.

After analysis of the survey results, Trident concluded that the source of the chlorides and sulfates in two water supply wells were from past oil field activities (former drilling pits).  The survey supported evidence that the magnitude and extent of impacted groundwater was limited, and risk to the private water wells currently active in the subject area was low.

Price Gramps Oil Field – Southern CO
The Decommissioning and Closure of an Oil Field

The Price Gramps Oil Field is located within a pristine ecological setting near wildlife areas, Federal wilderness, and recreational properties.  Closure was performed by Trident personnel under the regulatory guidance of the Colorado Oil & Gas Conservation Commission (COGCC).  The project began with an initial Phase I Environmental Site Assessment (ESA) to identify areas of potential environmental concern.  Each of these concerns were defined and evaluated during a Phase II ESA.  The estimated costs for complete closure and site restoration were presented to the land owner/field operator and work was initiated for the following elements:

• Plugging and abandonment of 47 oil wells according to COGCC requirements
  
  

• Closure of several large formation water evaporation ponds
  
  

• Disassembly, removal, and salvage of oil production equipment, tubulars, tanks, treatment vessels, and other related equipment
  
  

• Assessment of hydrocarbon-impacted groundwater and the performance of a risk evaluation for regulatory closure
  
  

• Assessment, removal, and disposal of asbestos containing equipment and building material
  
  

• Characterization and disposal of Naturally Occurring Radioactive Material (NORM) containing tank bottom material
  
  

• Decompaction and restoration of lease roads, well locations, tank battery sites, and operation facilities

A Trident project managers provided the oversight for the multiple subcontractors used during the project and performed the regulatory negotiations to ensure proper permits were in-place and the activities were conducted in compliance with the current rules.  The field activities at the site are limited to late Spring through early Fall due to the high altitude of the property and difficult winter-time access.  The ultimate deliverable for the project is regulatory closure and a complete transformation of the property to pre-oil field conditions.

UNOCAL Corp. – West Texas
Natural Attenuation

Trident Environmental personnel were contracted to prepare a remedial strategy work plan to address dissolved hydrocarbons in the shallow groundwater at a tank farm in west Texas.  Based on current and future land uses, the lack of potential receptors, and the results of a risk assessment, it was concluded that there is low risk with respect to exposure to human health and the environment from the hydrocarbon-impacted groundwater on site.  Therefore, monitoring the efficacy of natural attenuation by sampling the existing monitoring wells on site was chosen as the most practical method for site remediation.

The data collected to date demonstrates that the hydrocarbon-impacted soil and groundwater associated with the site is contained within the fenced property boundaries.  An exception is the northern property boundary that indicates the possibility of upgradient, off-site sources.  It is apparent that natural attenuation processes have been effective in stabilizing the plume and preventing continued downgradient migration due to the estimated age of the release (10 to 40 years) and limited extent of the plume (650 feet).  With the continuation of natural attenuation, the dissolved hydrocarbons will be reduced and dissipate to background levels as long as there is no additional source of hydrocarbons introduced on site.

Sampling and monitoring of groundwater conditions were conducted on a quarterly basis during 1997 and 1998.  Analytical results of pertinent parameters such as benzene, toluene, ethylbenzene, xylenes (BTEX), electron acceptors (dissolved oxygen, nitrogen and sulfate), and by-product constituents (ferrous iron, methane, and carbon dioxide) were used to determine the status of plume migration or recession.  After the fourth year of monitoring (1998), the data was evaluated to confirm that the benzene plume is stable and document the progress of natural attenuation.  Site closure with no further action was requested from the Railroad Commission of Texas (RRC) based on the following evaluation conclusions:

• The site dissolved plume is stable
  
  

• The plume has no potential to migrate off-site in the downgradient direction
  
  

• The plume is not a threat to potential off-site receptors
  
  

• Natural attenuation processes appear to be effective in stabilizing the plume and preventing downgradient migration
  
  

• Since December 1994, sampling event analytical data document that benzene concentrations did not exceed 0.7 milligrams per liter (mg/L), the representative source concentration used in the site risk assessment
  
  

• The risk assessment indicated that the plume risk and hazard index to current and potential future receptors is below acceptable levels

GPM – West Texas
Mercury Characterization

Trident Environmental personnel were retained by GPM Gas Corporation (GPM) to characterize the extent of mercury-impacted soils at approximately 500 gas meter sites prior to acquiring three west Texas gas gathering systems from a major gas producing company.  Mercury manometers had been used at approximately 350 of the 500 gas meter sites for gas flow measurement purposes.  Based on the results of the sampling investigation it was determined that approximately 207 sites would require remediation.

After completion of the characterization phase, Trident personnel prepared a programmatic engineering cost estimate (PECE) for the remediation and regulatory closure of the affected meter sites.  This document proved to be highly successful in negotiating a reduction in the asking price from the seller.  The PECE also included regulatory guidance and a conceptual work plan that detailed the scope of work required to implement the remediation activities.

The next phase of this on-going project will be to prepare the remediation work plan, quality assurance/quality control plan, and health and safety plan for submission to the Railroad Commission of Texas (RRC).  The work plan will be written to comply with applicable Resource Conservation and Recovery Act (RCRA) requirements and will detail the field testing procedures to measure mercury content in soils, sampling protocols, remediation procedures, and specifications for treatment and disposal options.  After approval of the work plan by the RRC, excavation, treatment, and disposal of the impacted soils will be implemented.

Yates Petroleum – Southeast NM
Preparation of Spill Prevention Control and
Countermeasure (SPCC) Plans

Trident Environmental personnel performed the field investigations and prepared Spill Prevention Control and Countermeasure (SPCC) plans for 39 hydrocarbon production and storage sites in several fields located adjacent to the Pecos River in southeast New Mexico.  The plans were constructed according to guidelines recommended by the American Petroleum Institute (API) for compliance with U. S. Environmental Protection Agency regulations.  The reports also included a photographic inventory of the equipment layout at each site investigated and a list of procedures and forms for the continued self-maintenance of the plans.  Because all of the plans were prepared together, the client realized an economy of scale savings in the overall costs.

GPM – Central Texas
Environmental Site Assessments at
Gas Compressor and Meter Sites

Trident personnel performed Environmental Site Assessments (ESAs) at six gas compressor sites and 18 meter stations in the Austin Chalk area of Central Texas.  The investigation was conducted at the request of GPM Gas Corporation (GPM) to establish pre-acquisition baseline conditions regarding hydrocarbon impacts to the soil and groundwater from historic operations at each facility.  The results of the investigation were used to demonstrate the current condition of the system with respect to potential environmental liability and document the spill history.

The gas compressor sites contained a variety of equipment configurations, operational standards, and levels of maintenance within a wide range of geographical and hydrogeological settings.  Consequently, an interpretation of site-specific environmental sensitivity was included based on local topography, soil types, geology, and potential man-made exposure pathways.

Trident employees were successful in quickly and efficiently identifying site operations and equipment that represented potential environmental concerns and evaluating those concerns by intrusive sampling.  The primary deliverables to GPM were characterization data (ESA reports) upon which the cost evaluations were based for consultations during the acquisition costs negotiations.

The information generated from the project led to a fair settlement of environmental costs which are currently being utilized to bring the purchased compressor stations into regulatory compliance.   

Petroleum Companies – Permian Basin
Phase I Environmental Site Assessments (Oil and Gas Fields)

Oil and gas producing companies of all sizes consistently rely on the expertise Trident Environmental in the evaluation of oil field properties for the determination of acquisition-related environmental liabilities.  Phase I (or limited Phase I) Environmental Site Assessments (ESAs) are a necessary part of doing business in the petroleum industry today.  Trident has evaluated oil field properties that range in size from 2 to over 300 wells, providing reports that are customized to meet our client’s specific requirements.

The Trident professional staff in the Midland, Texas office include personnel who have spent many years working in the petroleum industry and are familiar with the equipment and environmental risks associated with oil and gas production.  The results of this experience for our clients are low cost Phase I ESAs that identify all environmental concerns.  The identified concerns are evaluated by presenting possible scenarios for regulatory violation (or legal action) and providing recommendations designed to limit or eliminate potential financial exposure.

Various Companies – Throughout Texas
Environmental Site Assessment and Health Risk Evaluation
of Underground Storage Tank Release Sites

Trident employees in the Midland, Texas office are certified with the Texas Commission on Environmental Quality (TCEQ) and the New Mexico Environmental Department (NMED) to manage all phases of underground storage tank (UST) release investigations and cleanups.  Trident’s experience includes over 100 TCEQ and NMED regulated UST projects located in areas that exhibit a wide range of soil types, hydrogeologic settings, and human health sensitivities.  As the UST industry has evolved, Trident employees have maintained a position on the forefront as a leader in cost effective site assessment, risk evaluation, and hydrocarbon remediation of soils and groundwater.  In each case, the deliverable from Trident is the regulatory closure of the site either through negotiations with the state agencies, health-based risk assessment, or remedial action.