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| Effective Porosity (n') || 0.60 - 0.65 || 0.75 - 0.85 || 0.50 - 0.65 || 0.95
 
| Effective Porosity (n') || 0.60 - 0.65 || 0.75 - 0.85 || 0.50 - 0.65 || 0.95
 
|-
 
|-
| Maintenance access || Moderate || Excellent || Moderate || Difficult
+
| Maintenance Access || Moderate || Excellent || Moderate || Difficult
 
|-
 
|-
| Standard strength || H-20  || H-25 || H-20 || H-20 to H-25
+
| Standard Strength || H-20  || H-25 || H-20 || H-20 to H-25
 
|}
 
|}
  

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