Borehole Sanitary Seal Query

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Dear Sir/Madam,

First time using this service.

I am looking to establish best practice in placing a sanitary seal to prevent shallow groundwater intrusion into a water supply borehole. The borholes are manual drilled.

Specifically looking at: • Mix ratios for cementitous grout • Issues with using aggregate • Requirements for curing • Placement below water table • Need for tremie pipe or rodding/compaction Any help would be appreciated.

Kiran