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5479191 
Journal Article 
Straddle Packer Sampling and Testing of Wells Completed in Triassic Rocks of Pennsylvania 
Sutton, PG 
1984 
English 
Inflatable straddle packers were used for sampling and pumping tests of two contaminated wells (L-8 and L-9) completed in the Triassic-aged, fractured, consolidated Brunswick formation in Landsdale, Pennsylvania. Packer testing was conducted to sample discrete fracture zones and to determine the relative hydraulic characteristics of each fracture zone. Packer testing included constant rate pumping tests of each fracture zone in L-8 and constant head pumping of each zone in L-9. Volatile organic contaminants were present in all fracture zones sampled. Significantly greater concentrations of contaminants were present in the most permeable zones. The major volatile organic contaminants included trichloroethylene (TCE), tetrachloroethylene (PCE), and 1,1,1-trichloroethane (1,1 ,1-TCA). The most contaminated zones in each well contained 700 micrograms/L and 38 micrograms/L TCE respectively. Straddle packer testing was effective for sampling discrete fracture zones, identifying the most contaminated zones, and determining the relative water bearing characteristics of these zones. Packer testing enabled the determination of the head distribution between fracture zones, and aided in the delineation of local from regional flow systems. The information gained from packer testing should be very useful in the design and installation of monitoring and retrieval wells, and delineating the extent of contamination in local and regional groundwater flow system in fractured consolidated aquifers. (See also W87-01669) (Lantz-PTT) 
Water Resources Abstracts; Straddle packers; Water sampling; Groundwater quality; Observation wells; Pennsylvania; Triassic rocks; Lansdale; Fracture zones; Pump testing; Volatile organics; Organic compounds; Trichloroethylene; Tetrachloroethylene; 1-trichloroethane; Path of pollutants