Leak Mitigation Trial Program, River Landing, Miami
Highlights
- Application of NOH2O® for Positive-Side Curtain Grouting for Leak Remediation
- NOH2O® Formed a Waterproof Membrane behind and beneath a Wet Storage Room Area of an Underground Parking Garage
- Provided a 3-Year Warranty for the Treated Area
Trial Program Overview
The underground parking garage of River Landing is plagued with water ingress from both the floor and walls. Sovereign was tasked to perform a leak mitigation trial program in a storage room area. The storage room had experienced continuous water ingress; frequent attempts were made previously by others to manage the water using pumps.
Application of NOH2O® for positive-side curtain grouting was successfully demonstrated, and the area was observed to be free of water ingress immediately.
- Client – River Landing LLC
- Contract Name – River Landing Underground Facility Trial Program
- Trial Program Start – June 2, 2022
- Trial Program End – June 11, 2022
Approach
Sovereign was tasked to design and implement an effective solution. Following research and development, Sovereign designed a 3-phase leak mitigation program using NOH2O® to seal the water intrusion behind the floors and walls employing positive-side grout application to repair defects in the existing waterproofing membrane. The trial program was executed to confirm the efficacy of Sovereign’s application methods and grout.
- Drilling Phase
Four holes were cored on the floor slab to determine existing construction details and required depth of waterproofing. Holes F1 and F2 were drilled to 24” depth before intercepting the existing waterproof membrane. Holes F3 and F4 were drilled to 30” depth to the existing waterproof membrane. At the completion of drilling hole F3 and F4, the driller did not perceive any subsurface resistance to advancement of the drills string indicating presence of voids.
Hole F3 exhibited approximately 12” of water head pressure above the floor, and hole F4 had approximately 48” of water head pressure above the floor.
Three additional holes were cored along the floor–wall joint. Holes J1, J2 and J3 were drilled at a 45° angle at a height of 20” above the floor level to intersect the floor – wall joint.
Two separate holes were cored through walls of the structure. Holes W1 and W2 were drilled on the north and east wall (ramp side) respectively approximately 24” above floor level. Sovereign drilled to 30” to intercept the existing waterproof membrane on both holes.
- Dye injection
Sovereign’s standard procedure to map water flow patterns before initiating grout injection involves injection of dye water. Dye injection through floor hole F1 reported to floor holes F3 and F4. Dye also reported to floor-joint holes J1 and J3 located along the floor-wall joint on the east side of the trial area.
- Trial Program Grouting
Grouting was performed in sequence starting through the floor holes, then the wall holes, then finally the floor-wall joint holes. Communication was established between the injection holes and other holes as well as through localized floor fractures. Sovereign observed the path of least resistance to grout migration continuously changing during the grouting process.
Post-grouting observations performed jointly by Sovereign and the client demonstrated that the treated area was now dry. were cleaned and observed to be dry post grouting period.
Lessons Learned/Recommendations
- Sovereign observed the depth to the original waterproofing membrane to be variable.
- Large pockets of water under hydrostatic pressure were encountered. Sovereign advised that the pockets be treated in their entirety to sustain the intended design life of the structure.
- Injection of Ordinary Portland Cement (OPC) was recommended to cost-effectively fill any larger voids before introducing NOH2O® during future grouting programs designed to remediate leaks affecting the entire underground facility.
NOH2O® injection successfully repaired the waterproofing membrane behind the structure, rendering the test area dry.
