www.valenza-engineering.com 5 OGNZ - WUG Conceptual Engineered Mitigation of Impact on Surface Water Systems DRAFT Groundwater Control Strategy 1 . A s s e s s i n f l o w s a n d d r a w d o w n w i t h N u m e r i c a l M o d e l l i n g ( N M ) 2 . C o n f i r m c o n n e c t i v i t y o f a q u i f e r s a n d p a t h w a y s 3 . I n s t a l l m o n i t o r i n g i n s t r u m e n t s i n z o n e s o f i m p a c t a s s e s s e d i n i t e m 1 4 . C o n d u c t p r o b i n g a n d h y d r a u l i c t e s t i n g t o c o n f i r m t h e a r e a s w h e r e w a t e r m a n a g e m e n t m e a s u r e s a r e r e q u i r e d 5 . C o n d u c t p r o g r e s s g r o u t i n g a n d d r a i n a g e w i t h i n t u n n e l s a n d d r i v e 6 . I f c o n f i r m e d b y m o d e l l i n g , c o m p l e t e l o c a l i s e d d e p r e s s u r i s a t i o n a n d g r o u t i n g o f t h e u p p e r h o r i z o n s o f t h e m i n e b e f o r e m i n i n g 7 . I m p l e m e n t d e w a t e r i n g m e a s u r e s 8 . C o n d u c t s e c o n d a r y g r o u t i n g f r o m U G i n f r a s t r u c t u r e 9 . M o n i t o r i m p a c t a n d c o m p l e t e p r o g r e s s g r o u t i n g 1 0 . I f i m p a c t o n s u r f a c e i n s t r u m e n t d e t e c t e d , i d e n t i f y p a t h w a y a n d s u p p l e m e n t s u r f a c e f l o w w i t h m i n e w a t e r ( t r e a t m e n t r e q u i r e d )
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