Observations/Finding

Our AS ENGINEERING AND CONSULTING (ASEC) visited the site at the contractor’s request to observe soil placement for Riverwalk. The attached photo shows the designated cut-and-fill area. Fill soils were observed to be light tan, sandy silts. Soil moisture contents were high due to recent heavy rains. Our representative noted that soils were being placed in 36-inch lifts. The contractor was notified to reduce the lift size to 6 – 12 inches.  Compaction results for the top 6 inches of soil placements are shown below.

Compaction test results are shown below:
Wet Density 107.8 pcf
Dry Density 89.8 pcf
Moisture: 20%
Compaction: 90.7%

Wet Density: 109.0 pcf
Dry Density: 90.8 pcf
Moisture: 19.5%
Compaction: 90.4%