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Main Title Large-Scale Natural Gradient Tracer Test in Sand and Gravel, Cape Cod, Massachusetts. 1. Experimental Design and Observed Tracer Movement.
Author LeBlanc, D. R. ; Garabedian, S. P. ; Hess, K. M. ; Felhar, L. W. ; Quadri, R. D. ;
CORP Author Geological Survey, Reston, VA. ;Massachusetts Inst. of Tech., Cambridge. Dept. of Civil Engineering.;Robert S. Kerr Environmental Research Lab., Ada, OK.;National Science Foundation, Washington, DC.
Publisher c1991
Year Published 1991
Report Number NSF-ECE83-11786 ;NSF-CES88-14615; EPA/600/J-91/135;
Stock Number PB91-216275
Additional Subjects Tracer studies ; Environmental transport ; Subsurface investigations ; Water pollution ; Path of pollutants ; Aquifers ; Ground water ; Chemical properties ; Field tests ; Physical properties ; Lithium ; Bromides ; Horizontal orientation ; Vertical migration ; Injection wells ; Stochastic processes ; Geochemistry ; Hydrogeology ; Hydrology ; Water quality ; Molybdates ; Reprints ; Cape Cod(Massachusetts)
Library Call Number Additional Info Location Last
NTIS  PB91-216275 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 18p
A large-scale natural gradient tracer experiment was conducted on Cape Cod, Massachusetts, to examine the transport and dispersion of solutes in a sand and gravel aquifer. The nonreactive tracer; bromide, and the reactive tracers, lithium and molybdate, were injected as a pulse in July 1985 and monitored in three dimensions as they moved as far as 280 m down-gradient through an array of multilevel samplers. The bromide cloud moved horizontally at a rate of 0.42 m per day. It also moved downward about 4 m because of density-induced sinking early in the test and accretion of areal recharge from precipitation. After 200 m of transport, the bromide cloud had spread more than 80 m in the direction of flow, but was only 14 m wide and 4-6 m thick. The lithium and molybdate clouds followed the same path as the bromide cloud, but their rates of movement were retarded about 50% relative to bromide movement because of sorption onto the sediments. (Copyright (c) 1991 by the American Geophysical Union.)