Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Evaluating the Effectiveness of Ground Water Extraction Systems.
Author Haley, J. L. ; Hanson, B. ; Enfield, C. ; Glass, J. ;
CORP Author Robert S. Kerr Environmental Research Lab., Ada, OK.;CH2M/Hill, Reston, VA.
Publisher c1991
Year Published 1991
Report Number EPA/600/J-91/010;
Stock Number PB91-177386
Additional Subjects Water pollution control ; Ground water ; Extraction ; Waste disposal ; Remedial action ; Performance evaluation ; Hydrogeology ; Environmental transport ; Soil contamination ; Industrial wastes ; Superfund ; Plumes ; Aquifers ; Operating ; Case studies ; Site characterization ; Reprints ; Cleanup operations ; Remedial response ; Resource Conservation and Recovery Act
Library Call Number Additional Info Location Last
NTIS  PB91-177386 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 09/04/1991
Collation 8p
The most common process for remediating contaminated ground water is extraction and treatment. Data from 19 on-going and completed ground water extraction systems were collected and analyzed to evaluate the effectiveness of this process in achieving cleanup concentration goals for ground water. This analysis indicated several trends including: containment of ground water plumes was usually achieved; contaminant concentrations dropped significantly initially followed by a leveling out; after the period of initial rapid decline, the continued decreases in concentration were usually slower than anticipated; and certain data important to optimizing system design and operation had often not been collected during the site characterization phase. Factors limiting the achievement of cleanup concentration goals fell into four basic categories: hydrogeological factors; contaminant-related factors; continued migration from source areas and the size of the plume itself; and system design factors. The findings of the study indicate that ground water extraction is an effective method for preventing additional migration of contaminant plumes and achieving risk reduction. However, the findings indicate that in many situations, it may not be practicable to rely solely on ground water extraction and treatment to achieve health-based cleanup concentrations throughout the contaminated zone and fulfill the primary goal of returning ground water to beneficial use. This suggests several recommendations for improving ground water response actions including: actions to contain contaminant plumes should be initiated early; data on vertical variation of hydraulic conductivity, distribution of the contaminant mass, and partitioning of contaminants to soil or a stationary phase in the saturated zone should generally be collected as part of the site characterization process; remedial actions should be implemented in stages to better utilize information on aquifer response as the system is being designed and implemented; remedial actions should be monitored and modified during operation to optimize system efficiency; and methods to enhance extraction effectiveness and efficiency should be considered.