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:

Our representative observed the contractor place backfill using CAT 336 and CAT 3151 equipment to excavate the main trench (and place pipe) near the entrance. Contractor used a Komatsu PC490 LC excavator to dig trench and place storm drain and MH 8.7,8.8, 8.9. Once storm drain was placed contractor then placed No. 57 stone to 6 inches above the storm drain. Contractor compacted using walk-behind and sheeps-foot roller.

Our representative observed contractor usinga  CAT 3364 excavator to dig sewer trench between MH 6.8-6.9. Once contractor excavated the trench, main sewer line was placed. Contractor used CAT 938K loader to bring in No. 57 stone. They placed the No. 57 stone to 6 inches above the drainpipe. Backfill was then placed and compacted with a walk-behind roller.

Contractors also used a Komatsu PC490 LC excavator to dig trench and lay storm drain between MH Ae.4-Ae.5. Once storm drain was placed, contractor placed No. 57 stone to 6 inches above pipe. Backfilling and compaction with a walk-behind roller then proceeded.

Observations:

1. Backfilling Activities:
   • Backfilling was in progress for the sanitation sewer, and storm drain
2. Sewer Installation:
   • Sewer main was placed between MH 8.7,8.8,8.9
   • Storm drain was placed between MH 6.8-6.9, Ae.4-Ae.5
3. Compaction Status:
   • Compaction was carried out, using walk behind roller

Conclusion: The ongoing backfilling and storm drainpipe installation activities are progressing as planned, with considerations for lift sizes and temporary measures discussed with the foreman.