Modeling soil vapor extraction to evaluate performance of a system
- Sharp and Associates, Inc., Columbus, OH (United States)
- Metcalf and Eddy, Inc., San Diego, CA (United States)
The site described, located in northeast Ohio, originally had a 5,000 gallon UST that was used to supply gasoline. The tank was determined to be leaking from the fill port. Soil borings were augured to depth of 35 feet to determine the extent of soil contamination. At 20 to 30 feet in depth, contamination extended radially 50 to 60 feet. The estimated 1,600 cubic yard volume, as well as the proximity of existing buildings, made excavation, removal and disposal not cost effective. The depth of contaminated soils made bioremediation impractical. It was determined that sufficient information was available to install a vapor extraction system. The system includes 4 wells that can be individually drafted, a common vapor demister, and a 200 scfm induced draft fan. Vapor probes were installed to monitor both vacuum pressure and vapor concentration. The remediation was streamlined by focusing on installation of equipment and optimization of the system dynamics (operation). Data are collected monthly on individual well pressures, gas concentrations and mass loading in the exhaust. Analysis of these data yields radius of influence and contaminant mass withdrawal values. The draft to individual wells can be adjusted when needed to optimize system withdrawals. A model was developed, based on MODFLOW, and adapted to vapor extraction using known gas flow equations. The model was verified with known observed data. The results of this model were compared with data from the above site to determine appropriateness of using the model to design SVE system.
- OSTI ID:
- 6100757
- Report Number(s):
- CONF-921058-; CODEN: GAAPBC
- Journal Information:
- Geological Society of America, Abstracts with Programs; (United States), Vol. 24:7; Conference: 1992 annual meeting of the Geological Society of America (GSA), Cincinnati, OH (United States), 26-29 Oct 1992; ISSN 0016-7592
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GASOLINE
MATERIALS RECOVERY
LAND RECLAMATION
MATHEMATICAL MODELS
SOILS
DEGASSING
STORAGE FACILITIES
DRAFT CONTROL SYSTEMS
EXTRACTION
LEAKS
MONITORING
OHIO
TANKS
UNDERGROUND STORAGE
VAPORS
WELLS
CONTAINERS
CONTROL EQUIPMENT
DEVELOPED COUNTRIES
EQUIPMENT
FLOW REGULATORS
FLUIDS
FUELS
GASES
LIQUID FUELS
MANAGEMENT
NORTH AMERICA
PETROLEUM PRODUCTS
PROCESSING
SEPARATION PROCESSES
STORAGE
USA
WASTE MANAGEMENT
WASTE PROCESSING
020900* - Petroleum- Environmental Aspects