Statutes passed in many states which allow risk-based corrective action standards for contaminated sites have resulted in a flurry of remediation at sites where previously problems had festered. Recently regulators have increased their level of scrutiny over risk-based cleanup standards and demonstrations of remediation. For this reason great care is needed for exposure assessments and pathway evaluations.
If you are managing a site where intra-well or inter-well comparisons need to be made, WWGeosciences can set up the appropriate test in a user-friendly database. WWGeosciences sets it up for one monitoring period. In the subsequent period, you enter the new data, and the new period’s tests are done automatically.
Project Experience:
- Developed spreadsheet models for estimating volatile organic emissions from contaminated soils.
- Developed spreadsheet for computing vapor intrusion into buildings using the Johnson & Ettiger model.
- Performed pathway evaluations and exposure assessments for UST sites.
- Performed pathway evaluations and exposure assessments for industrial facilities.
- Combined groundwater modeling, vapor intrusion modeling and exposure assessment techniques to demonstrate attainment of remediation standards.
- Performed numerical modeling of contaminant transport in soils to evaluate the threat of future groundwater contamination from present soil contamination.
- Revision of public health risk assessment, and management of risk assessments through regulatory review and comment process.
- Performed numerical modeling of groundwater flow and contaminant transport to determine possible extent of contamination, evaluate remedial alternatives, or substantiate “no further action” determinations.
Case Studies:
- Numerical modeling of groundwater flow to determine extraction well location for water supply protection. Services were performed for industrial manufacturer in proximity to public water supply wellfield.
- Numerical modeling of groundwater flow and contaminant transport to determine extent of future contamination in buried valley aquifer. Services performed for industrial manufacture to support enhanced bioremediation plan. Plan received agency approval and is being implemented, current monitoring results have been consistent with model.
- Numerical modeling of groundwater flow and contaminant transport to predict seepage of contaminated groundwater into proposed excavation inside industrial facility. Services were performed for metals manufacturer planning factory expansion. Excavation was performed and observed water infiltration rates agreed with prediction.
- Numerical Modeling of groundwater flow and contaminant transport to evaluate future location and intensity of contaminant plumes migrating from UST sites. Services were performed for responsible parties to support remedial design or to demonstrate attainment of statewide health standards.
- Performed numerical modeling of groundwater contaminant transport to locate probable sources of groundwater impacts. Services were performed for industrial manufacturer in Piedmont area, involved in dispute over fair allocation of response costs.
- Performed numerical modeling of groundwater contaminant transport to locate probable contaminant travel time from sources of groundwater impacts to public water supply wells. Services were provided to law firm representing several industrial manufacturers engaged in insurance claim litigation regarding numerous sites.
- Performed unsaturated zone modeling at numerous UST sites to determine potential impact to groundwater. Services performed for responsible parties to determine whether groundwater remediation was needed.