Geotechnical engineering is a key part of each residential and/or commercial development. Geotechnical engineering investigates ground conditions to determine appropriate soil or rock properties to be used in the design of foundations. The geotechnical report also assesses existing or potential natural hazards such as erosion, falling debris, subsidence, inundation, and slippage. Our geotechnical investigation and report will be undertaken or supervised by a suitably qualified chartered professional engineer to ensure that all geohazards are appropriately identified and managed, and mitigation measures are provided.
As Geotechnical Engineers, we offer the following services:
- Geotechnical investigations including shallow and deep investigations.
- Coordinating specialist geotechnical testing,
- Liquefaction and lateral spreading assessment,
- Bearing Capacity Assessment,
- Detailed assessment for TC1, TC2, TC3 and hillside sites,
- Slope stability analysis,
- Foundation design for residential and commercial projects,
- Earthwork construction monitoring
- Geotechnical peer review,
- Foundation subgrade inspection.
Please contact our experienced geotechnical engineers below for further information:
Auckland, Hamilton, Waikato, Coromandel and Rotorua – Mostafa Kamali, 02108886165 OR email to email@example.com
Christchurch and Canterbury region – Akram Kawa, 0221079901, firstname.lastname@example.org
SCOPE OF SPECIFIC GEOTECHNICAL ENGINEERING SERVICES
Detailed Geotechnical Investigation
The scope includes site inspection to visually assess site geohazards and carryout shallow and deep geotechnical investigations to assess ground conditions for TC3 sites or where the risk of liquefaction is high.
A detailed geotechnical investigation is required for MBEI TC3 sites, sites prone to potential liquefaction hazards and commercial projects. The investigation and reporting are needed by local authorities and structural engineers to confirm requirements for complex TC3 sites and commercial sites. Depending on the size and complexity of each project, the geotechnical investigation will typically consist of:
- Shallow ground testing to 3.0m depth including Hand Augers, shear vane tests and Scala Penetrometer tests.
- Deep ground testing, which will include cone penetrometer tests (CPT) to minimum of 15m below ground level where ground conditions allow or Machine Borehole Tests, where CPT tests cannot be undertaken.
The price for a detailed geotechnical investigation and reporting is highly variable due to the size of the project and the number of tests required. There might be unforeseen conditions, that may require further testing excavation, laboratory testing of soils and external peer review.
Depending on our current workloads and our subcontractor availability, the shallow and deep testing will commence within two to three weeks of confirmation from you and the report issued two to three weeks after. For super urgent jobs, the turnaround time can be reduced to four weeks in total.
Hillside Geotechnical Investigation
The scope includes site inspection for a preliminary assessment of site stability and geohazards and carryout shallow testing to assess ground condition followed by a preliminary reporting including soil logs and a site plan.
The investigation and report will be required by local authorities and structural engineers to confirm foundation options and retaining wall design requirements. Two 3.0 -4.0m deep hand augers, Scala Penetrometer Tests, and shear vane tests. The geotechnical report will include but not limited to:
- Subsoil ground conditions and soil profile,
- Foundation Recommendations, and
- Recommendation for further testing or a detailed slope stability modeling due to unforeseen geotechnical issues.
A preliminary estimate of the price for the above scope within Auckland and Christchurch areas is between $1,800 – $4,000.
Depending on our current workloads and our subcontractor availability, the shallow and deep testing will commence within two to three weeks of confirmation from you, and the report issued two to three weeks after. For super urgent jobs, the turnaround time can be reduced to three-four weeks in total.
Foundation Subgrade Inspection
A subgrade inspection is typically used by contractors and builders to confirm ground conditions following the site excavation and before setting out the foundation and reinforcing details and/or pouring concrete. We can carry out a visual subgrade inspection followed by a short inspection report (no site plans or soil logging to be included).
The inspection is undertaken to confirm removal of topsoil and any other unsuitable soil material that may negatively impact the foundation performance. The inspection will also include confirmation of subgrade soil bearing capacity by undertaking Scala Penetrometer Tests and /or shear vane tests. The inspection record will be issued in the form of inspection notes to your engineer or contractor.
Our price for the subgrade inspection (only one inspection) is $400+GST in Christchurch $450+GST in Auckland.
If a producer statement (PS4) is required, there will be additional $350+GST