Certified onsite supervision for compliant backfilling
Level 1 Supervision provides continuous onsite oversight by a Sydney Water Certified technician throughout all stages of the backfilling process. This level of supervision is mandated under specific conditions within the Sydney Water Technical Specification and Section 73 compliance framework. By maintaining live, uninterrupted monitoring, we ensure that backfill materials are placed, compacted, and verified to meet strict engineering standards.
Our NATA-certified technicians verify material types, moisture content, and layer thicknesses before performing in-situ nuclear density compaction testing on each layer. Results are checked against project benchmarks (typically >98% Standard), and any inconsistencies are corrected immediately onsite, ensuring the final structure performs as designed and preventing costly rework or risk to buried infrastructure.
All supervision is documented in a detailed Level 1 Compaction Report for submission to geotechnical engineers, builders, or Sydney Water. This process safeguards against future settlement, pipe movement, or infrastructure damage and meets stringent council and utility requirements.
Scope of Level 1 Supervision
- Continuous, real-time monitoring of backfilling operations above sewer and stormwater pipelines
- Verification of backfill material suitability, including moisture content, type, and compliance with project specifications
- Confirmation of layer thickness prior to compaction to ensure layer uniformity
- Compaction testing on every layer using approved, NATA-traceable in-situ nuclear density equipment
- Instant correction of any non-compliant compaction results, preventing errors from being buried or overlooked
- Detailed documentation of all tests, observations, and corrective actions for certification purposes
Key Benefits
- Fully compliant with Sydney Water Section 73 requirements and relevant technical specifications
- Supports long-term structural integrity of pipelines and surrounding asset infrastructure
- Provides NATA-accredited compaction reporting suitable for builders, engineers and councils [Click here to view our accreditation.]
- Reduces the risk of future ground movement, pipe failure, or costly rectification work
- Ensures consistent quality control from manhole to mainline
- Provides peace of mind that backfilling has been completed to the highest standard
