Observations/Finding

At the request of the client’s representative, our AS ENGINEERING AND CONSULTING, LLC (ASEC) representative visited the job site to observe the contractor’s work activities from a quality standpoint to verify compliance with project drawings/specifications, applicable codes, and materials submittals and conducted QC testing per the project drawings and specifications.  The following observations were made on site this shift:

Summary: Utilizing a Caterpillar DK6, CP54B sheepsfoot ride-on vibratory compactor, and a D250E off-road tandem dump truck, an approximate 12-inch lift was placed and compacted in an area spanning approximately 74 feet x 150 feet (Lots #9, 10, and 11) at a depth of -3 feet below the surface. Compaction testing was conducted using a Troxler 3430 (Serial #30942) with a moisture-density relationship of 94.8 pcf Dry Density and 25% Moisture.

Compaction Testing Results: Upon receiving testing results:

• Test #1 recorded a Dry Density of 103.0 pcf and Moisture content of 18.2%.
• Test #2 yielded a Dry Density of 100.0 pcf and Moisture content of 20.3%. It was determined that natural rock was mixed into the soil testing area, potentially affecting the test results.

Proof Roll: A proof-roll was conducted using a loaded Tandem off-road dump truck, and Lots #9, 10, and 11 were observed to not display severe rutting/pumping at approximately -3 feet from the surface.

Infrastructure Installation:

• Storm drain manhole A9 was placed without stone bedding.
• Reinforced Concrete Pipe (RCP) was installed, connecting from B1 to B2, with no stone bedding utilized.
• Using a 3.8-inch probe rod, the deflection depth was approximately 1/2 an inch.
• Manhole B2 was placed without stone bedding.

Conclusion: The compaction and infrastructure installation activities were successfully completed, with compaction levels meeting acceptable standards despite the presence of natural rock in the soil.

A9 to B1 with Black corrugated pipe

B1 to B2 RCP

Testing

compaction of lots 9, 10 and 11

removing organics from back of lots 10 and 11