PR10 acrylamide from Prime Resins is a low-viscosity permeation chemical grout that is injected from within the manhole, wicking into the soil outside or used to curtain grout the exterior. A high-pressure pump injects grout through the manhole wall into the surrounding soil or is injected directly into the surrounding soil, creating an impermeable barrier. The permeation grout doesn’t expand, but rather saturates the soil immediately outside of the manhole (with a desired gel time) that permanently stabilizes the soil and prevents further groundwater penetration. 800-321-7212; www.primeresins.com.