Territory Stories

Nabarlek Pit decommissioning migration of sulphate, nitrate and radium ions in groundwater - preliminary modelling

Details:

Title

Nabarlek Pit decommissioning migration of sulphate, nitrate and radium ions in groundwater - preliminary modelling

Creator

Appleyard, S.

Collection

E-Publications; E-Books; PublicationNT; Report ; 41/1984

Date

1984-04-01

Description

Made available via the Publications (Legal Deposit) Act 2004 (NT).

Notes

Date:1984-04

Language

English

Publisher name

Dept. of Transport and Works

Place of publication

Darwin

Series

Report ; 41/1984

File type

application/pdf.

Copyright owner

Check within Publication or with content Publisher.

Parent handle

https://hdl.handle.net/10070/228496

Citation address

https://hdl.handle.net/10070/674076

Page content

Technical Report WRD84041 Viewed at 14:07:09 on 29/07/2010 Page 9 of 34. I ~-- ~~ I I I I I I I I I I I I I I I I I I I I or more of these parameters. If the curve shovm in Fig ~ 3.1 is assumed, the value of the ratio CICo is about 10-13 , which is equivalent to a discharge concentration -13 of radium in Cooper Creek of about 10 Bq/L. The above ratio applies only as t ~ 00, ie. radium is given ample time to reach the creek. If the flow rate is increased by an order of magnitude or if the rate constant or cross-sectional area is decreased by an order of magnitude, the value of the ratio CICo will be approximately 0.1, ie. the discharge concentration of radium in Cooper Creek will be one tenth that contained in the pit after rehabilitation. Similarly, if the floVl rate of radium ions is decreased by an order of magnitude, or if the cross sectional area or rate contant is increased by an order of magnitude, effectively no radium will reach Cooper Creek. The family of curves that result if the bulked constant term! K, is varied by an order of magnitude is shown in Fig 3.2. The terms G, A and k in equation (6) are all imprecisely knmvn largely because of lack of detailed knowledge about the degree to which a hydraulic connection exists between poorly transmissive rock near the pit and highly transmissive rock to the south-east. Geophysical work , test pumping will be carried out in the area to the south east of the pit by AGC this year, and data obtained from these studies may lead to better estimates of fracture density in this area, which in turn will lead to better estimates of the terms k, A and G being made. However, it must be stressed again that the above analytical solution was derived for t = roo AGe (1984) laboratory tests place the radium ions at Nabarlek in groundwater velocity of -6 the range 5 x 10 to 2 x -7 I . 10 m s, Vlh~ch suggests that Ra will not appear at Cooper Creek for about 5 x 105 years. SA2/l1 :TJ


Aboriginal and Torres Strait Islander people are advised that this website may contain the names, voices and images of people who have died, as well as other culturally sensitive content. Please be aware that some collection items may use outdated phrases or words which reflect the attitude of the creator at the time, and are now considered offensive.

We use temporary cookies on this site to provide functionality.
By continuing to use this site without changing your settings, you consent to our use of cookies.