Lubbock County Pilot Study for Development of a Hydrogeologic Geographic Information System (HGIS) to Support TNRCC Implemation of Risk Reduction Rules

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1997

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Regional hydrologic, geologic, soils, and cultural background information and data from 217 leaking petroleum storage tank (LPST) sites in Lubbock County, Texas, are used to construct an Arc/INFO Geographic Information System (GIS). The study evaluates the use of this technology to provide context information for new site evaluation and risk assessment as well as to evaluate the effectiveness of past site characterization, risk assessment, and remediation strategies. Methods and costs of producing the database in this pilot study are described.

Several analyses of these data are presented as a demonstration of the uses of this tool. The heterogeneity within the unsaturated zone is characterized spatially and statistically. Hydrologic variables including water level and hydraulic conductivity from well tests are mapped. The effect of this observed variability on Risk-Based Corrective Action (RBCA) calculations is assessed. The evolution of contaminant plumes can be viewed, and relationships between plumes and water-supply wells quantified.

This pilot study demonstrates an application of GIS technology to a moderate-size dataset of contaminated-site information. The demonstration is intended not only to provide information about the Lubbock County study area but also to serve as a prototype and feasibility study for the application of this technology to other large contaminated-site datasets, including LPST-site data in other major urban areas, other types of contaminated sites, and industry applications.

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