This is a standard seepage treatment process for underground cement water reserve tank. It includes: 1. Dismantling of the damaged plaster 2. Crack Treatment 3. Nozzle Pressure Grouting and required points 4. 1st layer waterproofing chemical 5. Concrete chamber construction at corner area with cement mortar in mix with waterproofing chemical 6. Membrane sheet application in the joints, intersection and corner areas 7. 2nd layer waterproofing chemical coating 8. Plaster finishing and punning work 9. Cleaning and finishing 10. Water Ponding Test