www.valenza-engineering.com 14 OGNZ - WUG Conceptual Engineered Mitigation of Impact on Surface Water Systems DRAFT Observational grouting and drainage from UG ❑ P r o b e h o l e g r o u t i n g d u r i n g t u n n e l c o n s t r u c t i o n o I d e n t i f i c a t i o n o f g r o u t i n g z o n e s p r i o r t o c o n s t r u c t i o n f r o m C H M ( e . g . , W a i h i F a u l t t r a n s i t i o n - Z o n e 2 ( W h i t i r o a b r e c c i a / t u f f ) → Z o n e 3 ( i n f a u l t z o n e ) → Z o n e 2 → Z o n e 1 ( W a i p u p u a n d e s i t e f l o w s ) o P r o b i n g d u r i n g f a c e a d v a n c e m e n t . N u m b e r o f p r o b e h o l e s a c c o r d i n g t o z o n e ❑ O b s e r v a t i o n a l g r o u t i n g f r o m U G d u r i n g m i n e d e v e l o p m e n t o A s s u m e s h i g h i n f l o w z o n e s i n u p p e r v e i n s y s t e m s l a r g e l y g r o u t e d d u r i n g p r e - d e v e l o p m e n t o P r o b e h o l e u s e d t o a s s e s s r e s i d u a l i n f l o w s a n d g r o u t a c c o r d i n g l y o T - S t r e a m v e i n i n f l o w s m a y b e m a n a g e d s o l e l y f r o m u n d e r g r o u n d d e p e n d e n t o n f u r t h e r a s s e s s m e n t
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