Serving Shoreline
Groundwater & Basement Water Intrusion in Shoreline, WA
Basement seepage, failed sumps, and hydrostatic pressure against the foundation are extracted and dried, and the path from the ground is identified so the loss does not repeat. Groundwater and basement seepage are extracted and dried only after the path from the soil is identified — a wall, a slab, a drain, or a failed sump. Drying the interior without stopping that path returns the same water to the same floor.
Frequently asked questions
Water comes out of the hillside partway down.
That is the layering, and it is the defining ground condition here. Permeable material sits over dense till, so water moves down until it reaches the contact and then travels sideways along it until the slope face intercepts it. The seep appears well away from where the rain fell, with no visible connection.
Why do the bluffs here have a slide history?
For the same reason. Once the perched layer above the till is saturated, the material above it becomes heavy and the contact becomes a weak surface, and on a steep bluff that combination moves. It is driven by prolonged saturation rather than by any single storm, which is why the movement tends to come late in a wet winter.
The rain is never heavy here.
It is rarely intense, and that is not the mechanism. Ground can handle a heavy hour if it has time to recover, and here it gets steady rain for months with no such interval. Saturation is reached early in the winter and simply maintained, so the ordinary condition through the season is soil that can take nothing more.
These questions come from the Shoreline page.