1996 Fall Meeting
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"H21C-12"

------------------------------
HR: 0830h
AN: H21C-12 POSTER 
TI: Use of Hydraulic and Tracer Tests to Determine Flow and Transport Properties of a Fractured Sedimentary-Rock Aquifer in the Passaic Formation, New Jersey
AU: *C Welty, G Carleton 
MN: Fall Meeting 1996

------------------------------
AN: H21C-12
TI: Use of Hydraulic and Tracer Tests to Determine Flow and 
    Transport Properties of a Fractured Sedimentary-Rock 
    Aquifer in the Passaic Formation, New Jersey
AU: Claire Welty
EM: weltyc@duvm.ocs.drexel.edu
AU: Glen Carleton
EM: carleton@usgs.gov
AB: 
    The U.S. Geological Survey, in cooperation with the 
    New Jersey Department of Environmental Protection, 
    conducted a study to demonstrate that readily available 
    methods can be used to estimate hydraulic and transport 
    properties of a fractured sedimentary-rock aquifer in the 
    Passaic Formation in northern New Jersey. Time-
    drawdown data obtained from 15 wells in a 0.1-square-
    kilometer area during a 9-day aquifer test differ 
    substantially among the wells. Results of aquifer-test 
    analysis conducted by using both analytical and numerical 
    porous-media models indicate that the formation behaves 
    as an anisotropic, heterogeneous system that is affected by 
    large-scale no-flow boundaries (updip outcrop and 
    downdip aquifer extinction) and local constant-head 
    boundaries (ponds and rivers). Principal values of 
    hydraulic conductivity of the formation, estimated from 
    results of calibration of a three-dimensional numerical 
    model, are 8 x $10^{-5}$, 4 x $10^{-5}$, and 5 x $10^{-10}$ 
    meters per second in the strike, dip, and orthogonal-to-the 
    bedding-plane directions, respectively. Three non-
    recirculating doublet tracer tests, each with a pulse of 
    bromide as the tracer input, were conducted at 30, 91, and 
    180 m (meters) to evaluate the scale effect. The bromide 
    breakthrough curves are smooth, with non-ideal tailing that 
    diminishes with increasing scale. Interpretation of the 
    breakthrough data with both analytical and numerical porous-
    media solute-transport models yielded apparent longitudinal 
    dispersivity values of 4.6, 10, and 13 m at the three test 
    scales, respectively, and a value of effective porosity of 
    8.1 x $10^{-4}$. Results of the data analysis indicate that 
    porous-media models adequately represent flow and transport 
    in a fractured sedimentary-rock aquifer at the scale of 
    this site. 
SC: H
DE: 1832
DE: 5114
DE: 5139
MN: Fall Meeting 1996

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