Hydro Geo Chemical
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Our mission is to provide cost-effective, innovative solutions to complex environmental and hydro- geologic problems. Our team of creative, experienced, and highly motivated people use their skills in consulting, modeling, engineering, and/or construction services to fully satisfy our customers. Our vision is to be a nationally recognized provider of cost-effective innovative solutions to our client's environmental and hydrological service needs.

read more › Hydro Geo Chem is a consulting firm that provides the mining industry with support in dewatering and environmental projects. Hydro Geo Chem evaluated dewatering alternatives for a large, underground trona mine in Wyoming. High groundwater inflows were encountered during tunnel construction through fractured granitic rocks, requiring expensive dewatering far in excess of that anticipated during project planning. Waste water handling practices at a trona processing plant had created a brine plume in a fractured bedrock aquifer that discharged into a nearby river.

read more › Hydro Geo Chem, Inc. (HGC) has provided high-quality, award winning environmental services to both the public and private sector. We have experience on a variety of solid waste issues throughout the United States. Working with numerous solid waste industry clients and regulators, we have applied innovative technologies such as aerobic stabilization of landfill waste; soil vapor extraction (SVE) and air injection (AI) to remove chlorinated hydrocarbon sources from deep vadose zones beneath unlined landfills; and pump-and-treat bio-enhancement technologies for contaminated groundwater plume containment and cleanup.

read more › Hydro Geo Chem performs Phase I and Phase II Environmental Site Assessments (ESAs) that meet the industry standard for environmental due diligence services for acquisitions and financing of commercial and industrial real estate and related consulting services. Environmental assessments associated with these transactions often reveal recognized environmental conditions (RECs) that require follow-up and documented resolution. Our professionals follow the due diligence process from inception through completion, and when RECs are encountered can identify a path that leads to a satisfactory outcome for all parties involved within the due diligence timeframe.

read more › An uncontrolled landfill, part of a federal enforcement action, had released numerous non-aqueous phase liquids (NAPL), including hydrocarbons and halogenated solvents. Both soils and groundwater were highly contaminated. A slurry wall installed by the EPA as an interim remedial measure exacerbated the problem because of rainfall accumulating within the slurry wall. The final remedy in the Record of Decision (ROD) stipulated removal of half a million cubic yards of soil, with 90,000 cubic yards being incinerated.

read more › Several holding ponds, including a 40-acre flue gas desulfurization (FGD) pond, had leaked into aquifers underlying a coal-fired power plant. The only groundwater data available had been collected after pond leakage had affected area water levels. Hydro Geo Chem was retained to define the impacts of FGD pond leakage and to determine operational and remedial alternatives. We established the extent of FGD and other pond leakage by reconstructing the aquifers' historical flow fields by means of a 3-dimensional transient inverse model, by installing wells and conducting aquifer and tracer tests to determine aquifer parameters, by employing stable isotopes to identify the contributions from the various pond sources, by a spontaneous potential and seep-meter leakage survey of the FGD pond, and by modeling the fate and transport of salts from the ponds.

read more › Soil and groundwater at a closed electronics manufacturing facility within San Gabriel Basin Superfund Area were impacted by releases of more than a dozen chlorinated solvents. A groundwater plume has migrated more than 1/2 mile from the site, with indications of a continuing on-site DNAPL source. Develop soil cleanup standards appropriate for the site, and design and install a soil vapor extraction system suitable for low permeability sediments. Design and construct on-site groundwater containment and source removal system and obtain closure.

read more › High groundwater inflows were encountered during tunnel construction through granitic rocks, part of a large underground hydroelectric project. These flows, emanating from discrete fractures in the bedrock, required expensive dewatering far in excess of that anticipated during project planning. Hydro Geo Chem was retained to evaluate the hydrogeologic conditions at the site, to determine potential sources of the groundwater, and to estimate the duration of the flows. Our investigation had to be conducted rapidly and in the presence of on-going construction activities.

read more › Predesign field investigations included soil-gas surveys, soil permeability surveys, and SVE pilot tests. Based on the results, numerical models of alternative system configurations were developed and used to optimize the system design. In addition, a vadose zone mass-flux model was created and used to calculate performance standards for the SVE system. The model considered aqueous-phase VOC transport from the vadose zone into the aquifer. Model results were used to negotiate final clean-up standards.

read more › Releases from underground diesel and gasoline storage tanks had contaminated 300,000 cubic yards of soil at a City-owned facility. A benzene plume extended more than mile downgradient in the regional aquifer. Previous site investigations revealed a multi-layer aquifer and two distinct plumes. An organization of area citizens was concerned with the status of the investigations, the conclusions of the health risk assessment, and the communication of results. As a result, an elementary school was closed and the City officials and consultants in charge of the investigation were replaced.

read more › A release of hydrocarbons, ketones, and semi-volatile mixed-organic wastes from a chemical manufacturing facility had created a perched groundwater mound, nearly 1 mile in diameter, which leaked downward into the regional aquifer. Attempts to eliminate the perched mound through pump-and-treat methods had not been effective. Hydro Geo Chem was retained to develop a more effective approach for protecting regional water quality and determine whether existing systems were effective or even necessary.

read more › Gasoline and diesel releases from an active fuel station created a groundwater hydrocarbon plume that eventually migrated 1/4 mile from the facility. Previous remedial efforts were hampered by high arsenic concentrations and an off-site TCE plume commingled with the hydrocarbon plume. The client requested that Hydro Geo Chem manage remedial efforts, and specifically develop, test, and implement in-situ containment and source reduction technologies that would not result in additional waste streams or extracted groundwater.

read more › A 28-mile long shoestring alluvial aquifer contains a 7-mile-long plume of metals and acid resulting from seepage from historical mining operations. The front of acidic groundwater was moving nearly 2 feet per day, threatening domestic users and surface water. Hydro Geo Chem was retained to develop an effective approach for halting the advance of the acid front and develop a comprehensive plan for aquifer remediation. We determined that the plume acidity was primarily dissolved iron and its advance was controlled by acid neutralization from carbonates in the alluvium.

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