DE RANOE : UNDERGROUND WATERS IN LINCOLNSHIRE. 51 
In the Cleethorpes boring the top of the chalk was very rotten 
and had to be tubed out down to 120 feet from the surface, or 21 
feet from the top of the chalk. The yield from this boring is only 
about 180,000 to 192,000 gallons per day, and it is evident that the 
water is not entirely tubed out from the upper part of the Chalk, 
from the fact that, when this quantity is pumped, the water-level 
being 24 feet from the surface, the neighbouring wells and bore- 
holes all lose their supply of water, none of which do more than 
penetrate the top bed of the Chalk. 
At Grimsby Docks there is a well in the Chalk 300 feet deep ; 
the water is clear and palatable. Analysed by the Rivers Pollution 
Commission, was found to have a hardness of 221, of which 7 '6 was 
permanent ; chlorine was 5 "00. in parts per 100,000. 
