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Banner - Protecting Drinking Water from Potential Flood Contamination

Protecting Drinking Water from Potential Flood Contamination

Body - Protecting Drinking Water from Potential Flood ContaminationPlanners at Washington D.C.’s water utility, D.C. Water, decided to take proactive measures against potential flooding of their facility. Located right next to the Potomac, their facility could’ve been at risk in the event of an out-of-the-ordinary natural disaster. Determining that the main risk to the water supply in such a case would be permeation through sub-surface soil, they began installing a metal sheet pile wall deep into the substrate between the riverbank and the facility. However, in some spots, they were not able to drive a sheet pile panel into the ground because of underground utility lines or rocky substrate. The planners called in Seawall Repair Network contractor LJS Waterproofing to create sub-surface grout walls in those spots to fill in the gaps.

Repair Materials

The crew “constructed” these sections of the underground wall by injecting SW-RP1. This repair material permeates the soil, fills small voids in the soil, and cuts off water flow.

Procedures

LJS Waterproofing professionals used a Geoprobe to drive injection pipes into the ground (up to 33 feet in some locations). They then injected one gallon per foot using upward staging. The next injection point was 18 inches away from the first one. This process was repeated until a grout wall formed, filling the gap between the two adjacent underground sheet piles. For a large-scale job like this, they used a PolyShark single component grout pump manufactured by Alchemy-Spetec.

Results

With solid, impermeable grout walls filling in the gaps, a sub-surface barrier between the riverbank and the drinking water facility was now in place. The planners at D.C. Water were very satisfied with this solution.

Banner - Lakefront Seawall Repair in Wisconsin

Lakefront Seawall Repair in Wisconsin

Body - Lakefront Seawall Repair in WisconsinThe owner of a marquee lakefront property near Genoa City, Wisconsin contacted Phase One Shoreline Solutions regarding their crumbling seawall. There was a 75-foot slope behind the wall, guiding rainwater down into the soil behind the structure. There was no drainage system in place, so the water in the soil created immense hydrostatic pressure over time. If the wall failed completely, the slope behind it would begin to erode into the lake, dramatically affecting the value of the property.

Repair Materials

The contractor repaired the structure with Seawall Repair Network’s SW-RP1, the installation of pressure release technology, and concrete patching and waterproofing coating.

Procedures

The crew began by injecting the high-strength SW-RP1 repair material into the soil behind the wall in order to provide structural support and stop water leaks. Next, they repaired the cracks in the wall with high-performance patching concrete. After that, they installed pressure release technology in order to prevent future hydrostatic pressure build-up. Finally, they coated the entire wall with waterproofing cementitious coating.

Results

The dramatic before and after pictures included in this case study indicate the effectiveness of this repair job. The original strength and appearance of the wall were restored. Safeguards were put into place to alleviate the cause of degradation, thus preventing future damage. The customer emailed the contractor with a simple three-word response to this repair job: “I love it!”