Capture as much of the site runoff before it gets near the path. As a backup system construct a swale and catch basin that captures and routes any water flow on the path before it reaches the bluff crest. Tightline the captured flow down the slope. Construction of a new residence in a previously undeveloped area. Area is mapped in Coastal Zone Atlas as Historic Old Slide Area.
Soils are sand over clay.
There is evidence of groundwater seepage with water loving vegetation on a portion of the slope. Natural groundwater daylighting on the slope. Recognize that development on known slide areas contains inherent risk, even with the best of engineering design. Development of a 10 acre subdivision in a previously undeveloped and heavily vegetated area. Extensive slope clearing, grading, cuts, and fills performed.