www.valenza-engineering.com 21 OGNZ - WUG Conceptual Engineered Mitigation of Impact on Surface Water Systems DRAFT Groundwater Control Concept ❑ T u n n e l s & D r i v e s o I n s t r u m e n t a t i o n , p r o b i n g o P r o g r e s s g r o u t i n g a n d D e p r e s s u r i s a t i o n ( d r a i n a g e ) o D e w a t e r i n g ( s u m p p u m p i n g ) ❑ S h a f t s & H e l i c o i d a l D r i v e s o I n s t r u m e n t a t i o n & t e s t i n g o G r o u t i n g o f u p p e r s e c t i o n s o P r e - d e v e l o p m e n t d e w a t e r i n g ( i f r e q u i r e d ) o P r o g r e s s g r o u t i n g a n d D e p r e s s u r i s a t i o n ( d r a i n a g e ) o D e w a t e r i n g ( s u m p p u m p i n g )
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