Does anyone know what types of invetigation procedures and repairs are typically performed on a drain-field when there is a 10' diameter(septic) wet-spot in the middle of a large 100x100 leach-field (5 drain-pipes, each 100' long @ 20' c-c).
The soils are approx 7-10 feet deep, & free draining...
Contractor is trenching approx 8 ft thru random fill, placing bedding, 3 ft re-concrete pipe, and compacted granular backfill (#8).
Invert of pipe is critical. We have now encountered some very soft soil (STP=woh) along the trench alignment below the random fill at the bottom of the trench...
Can anyone direct me to reference materials which may have correlations to estimate shear strength from atterburg limit results ? I have been told these correlations exist, but I cannot find them. This data is for concept design only, so I am using available info and any correlations I can...
