www.valenza-engineering.com 10 OGNZ - WUG Conceptual Engineered Mitigation of Impact on Surface Water Systems DRAFT Pre-development grouting from surface/UG ❑ U t i l i s i n g e x i s t i n g d r i l l p a d s t o p l a c e s h a l l o w i n s t r u m e n t s ( r i g w i t h s p e c i f i c c a p a b i l i t i e s m i g h t b e r e q u i r e d ) ❑ U s e s u r f a c e l o c a t i o n ( b u t m o s t l i k e l y s h a f t s a n d i n c l i n e s ) t o g r o u t i n h i g h - K z o n e s ❑ C o n c e n t r a t i n g o n E G V a r e a a b o v e u p p e r m i n e s t o p e e x t e n t ❑ F a n g r o u t i n g p a t t e r n ( v a r i a b l e d i p a n d a z i d r i l l h o l e s ) t o c o v e r v e i n i n t e r s e c t i o n s ❑ M u l t i p l e i n t e r s e c t i o n s a n d g r o u t i n g l e n g t h s w i t h i n e a c h d r i l l h o l e t o c o v e r E G V s t r i n g e r s ❑ T - S t r e a m v e i n s y s t e m n o t t a r g e t e d a t t h i s s t a g e b u t t h i s m a y c h a n g e 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 ❑ D i r e c t i o n a l d r i l l i n g u n l i k e l y t o p r o v i d e a n y b e n e f i t b u t m a y b e c o n s i d e r e d d e p e n d e n t o n d r i l l i n g c o n t r a c t o r c a p a b i l i t i e s ( m a y a l l o w b e t t e r t a r g e t i n g o f g r o u t p l a c e m e n t )
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