Richmond sits barely a meter above sea level on the Fraser River delta, a fact that shapes every foundation decision here. With a population pushing 230,000 and an active port economy, the pressure to build on these soft deltaic soils is constant. The cone penetration test gives us a continuous, high-resolution log of the subsurface without the mess of cuttings or the disturbance of a split spoon. Our team runs a 20-tonne CPT rig that pushes a 60-degree cone at a standard rate of 2 cm/s, measuring tip resistance, sleeve friction, and pore pressure in a single push. When a developer calls us for a mid-rise on No. 3 Road, we know the answer starts with a CPT test to map the compressible silts and spot any loose sand layers that could trigger settlement or liquefaction under the NBCC ground motion demands.
In deltaic silts, a CPT friction ratio shift of half a percent can separate a competent silt from a liquefiable one — and in Richmond, that changes the foundation design.
Methodology applied in Richmond BC
Demonstration video
Critical ground factors in Richmond BC
The mistake we see too often is a consultant specifying only SPT borings for a liquefaction assessment on Garden City Way and then wondering why the client cannot get a building permit. Richmond’s seismic hazard is real — the last damaging event was the 1946 Vancouver Island earthquake, and the NBCC 2020 assigns a peak ground acceleration around 0.45 g for this site class. CPT data gives you the continuous thin-layer detection that an SPT hammer misses, and without it a loose sand lens half a meter thick can escape classification. That lens becomes the failure plane during shaking. The risk is not just technical — it is a schedule risk, because a design missing CPT-level resolution will bounce back from peer review, and in this city every week of delay costs real money.
Our services
Our CPT work in Richmond typically integrates with two complementary investigations that round out the geotechnical picture for delta deposits.
Mobile CPT Sounding with Piezocone
A self-contained 20-tonne truck-mounted rig that pushes a piezocone to refusal or 30 m. We log tip resistance, sleeve friction, and pore pressure in real time, then deliver a digital log with SBTn classification within 24 hours.
Liquefaction Trigger & Settlement Analysis
Using the CPT data and NBCC spectral accelerations, we run a Seed & Idriss cyclic resistance ratio analysis and estimate post-liquefaction volumetric strain for each soil layer encountered.
Frequently asked questions
What is the typical cost of a CPT sounding in Richmond?
For a single 20-meter piezocone sounding with full data processing and a digital log, you are looking at a range of CA$230 to CA$300. Mobilization within Metro Vancouver is usually a separate flat charge, and we discount when you book three or more soundings on the same visit.
How deep can a CPT rig push in Richmond's delta soils?
Our 20-tonne rig typically reaches 20 to 25 meters before hitting dense Pleistocene till or refusal. The soft Holocene silts and sands in Richmond offer low push resistance, so depth is limited by the rig's reaction mass rather than the cone capacity.
Do I need both SPT borings and CPT soundings on the same site?
In our experience on Richmond projects, the two methods answer different questions. CPT gives you a continuous strength and pore pressure profile and is superior for liquefaction screening. SPT borings let you recover samples for index testing and visual classification. Most designs we see combine both, using the CPT to optimize the boring plan and fill in the gaps between sample intervals.
How fast can you turn around CPT data after the field test?
We process the raw data the same day and email you a preliminary PDF log with qc, fs, u2, and friction ratio curves. Within 48 hours we can deliver a full interpreted report including SBTn classification, undrained shear strength profiles, and a liquefaction trigger analysis if that is part of the scope.