Nabarlek Pit decommissioning migration of sulphate, nitrate and radium ions in groundwater - preliminary modelling
E-Publications; E-Books; PublicationNT; Report ; 41/1984
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Dept. of Transport and Works
Report ; 41/1984
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Technical Report WRD84041 Viewed at 14:07:09 on 29/07/2010 Page 7 of 34. I -=-=---= --=-= -'---;--= I I I I I I I I I , II I I I I I I I I I If the cross sectional area,A , of each fracture is knmv-n, concentrations of radium can be determined as a function of length, 2 , along a given fracture; ie.~n 1 - k A }, (6 ) (I-X) G The amount of radiQ~ remaining in solution, C , is C o related to the fraction adsorbed, X, by: c = I-X (7 ) substituting into (6): in 1 - k A Q, (8 ) CIC G o where k, A and G are constants that have to be estimated here. Australian Groundwater Consultants (1984) have estimated that the maximum seepage rate from the pit will be of the order of 35 n 3 /day. Radium concent.rations in pit \v2.ter at this time will be in the order of 100 Bq/L. Therefore, the radium flux, G, for the model is given by: G - 100 Bq/L x lOOO Lim' = 3.5 , 6 x 10 BCI/day Darcy I S La" can be expressed as: where 81>.2 /11: TJ Q - vA Q - discharge volume v - pore water velocity A = cross sectional area x 35 roo/day (9 )