Katherine Groundwater Investigations, Cretaceous Sediments near the King River,1985.
Yin Foo, Des
E-Publications; E-Books; PublicationNT; Report ; 3/1985
Made available via the Publications (Legal Deposit) Act 2004 (NT).
Dept. of Mines and Energy
Report ; 3/1985
Check within Publication or with content Publisher.
Technical Report WRD85003 Viewed at 14:07:03 on 29/07/2010 Page 33 of 45. Bores 23426 and 23429 were drilled 8 Kms north-east of the Venn Airstrip area. This area is underlain by a thick sequence of clays with a perched aquifer at 33 m in jointed grey mUdstone. Bore 23426 was drilled with air which caused instability of this layer. Further problems upon intersection of sands at 86 m prevented deeper drilling. 50 rom G.W.P. was run to that depth and a water sample obtained from the sands with the upper aquifer sealed. Bore 23429, sited approximately 50 m distant, was subsequently drilled with mUd. Weathered remnants of the Tindall Limestone sequence between 80m-120m overlay basalt. This bore indicated the sandstone to be 'lensing out' in this area. Bore 23427 was sited 2 kms north of bore 23426. A thicker sequence of sandstone was intersected. Bore 23428 indicated the sandstone to become more shallow in this area, while also becoming thinner. Approximately 10 m of sandstone overlay highly weathered material of the Tindall Limestone Formation at 30 m. Basalt was intersected below this unit at 60 m. Bore 23540 was constructed as a test bore. 150 rom casing was run to 50.8 m. Three metres of screen and a four metre sump were set against the aquifer. The long sump was to allow for a deeper pump setting. 3. Test pumping Only one bore, 23540 was constructed to test the aquifer. A preliminary test involving several rates was performed to determine the ideal rate at which a constant discharge test could be conducted. The subsequent constant discharge test was conducted for a duration of 4700 minutes at a rate of 3.0 Lis. One observation bore, 23424 was monitored during this test. The results of this test are shown in Figures A3(g) and (h). DYF:TJ:79 04:REP4