A six-story mixed-use building going up on West 49th Street hit an unexpected layer of silty sand at 8 feet. The fill didn't match the specs, and the concrete pour was on hold. Our lab ran a full ASTM D6913 sieve analysis with D7928 hydrometer on the material. Forty-eight hours later the engineer had a complete gradation curve, the Atterberg limits, and a reclassified soil that saved the footing design from a costly over-excavation. Hialeah sits on porous limestone with pockets of transported fine sands and organic silts, so assuming uniform material is a gamble. We test it. You build on certainty. When the grain distribution matters for drainage, compaction, or frost protection, we combine our analysis with field verification like the sand cone density test to confirm that the placed fill actually meets the lab target.
Uniformity coefficient and fines content determine drainage behavior. If you don't wash the minus #200, you're guessing.
Scope of work in Hialeah
Typical technical challenges in Hialeah
The Miami Limestone beneath Hialeah dissolves over time, creating ravelling zones and irregular cavities filled with silty sand and organics. If you place engineered fill over these pockets without a grain size check, you risk differential settlement and poor drainage that leads to pavement cracking within two seasons. The hydrometer fraction is especially important here. Silts and clays in the minus #200 range control permeability and frost susceptibility, even in South Florida's climate, where saturation is the bigger concern. A fill that meets the coarse sieve spec can still fail the fines requirement. We catch that before the compaction crew leaves the site. The IBC references ASTM D2487 for classification, and the local building department in Hialeah will ask for it on any project requiring a geotechnical report.
Our services
We keep the service list practical. You need the data, you need it fast, and you need it to hold up under review. Everything is run in-house with calibrated equipment.
Full Sieve + Hydrometer Package
Combined ASTM D6913 and D7928 analysis on one sample. Includes wash sieve, full gradation curve, Cu/Cc coefficients, USCS classification, and a signed report. Standard for fill verification and drainage design.
Rapid Wash Sieve (Minus #200)
Focused test for contractors who need same-day fines content. Wash sieve only, per ASTM D1140. Used during fill placement to confirm material cleanliness before compaction.
Common questions
How much does a grain size analysis cost in Hialeah?
A standard combined sieve and hydrometer test typically runs between US$90 and US$200, depending on whether we need the full hydrometer sedimentation or just a wash sieve for fines content. Rush turnaround has a small surcharge. We'll give you a firm quote once we know the number of samples and the testing depth.
What is the difference between a sieve analysis and a hydrometer test?
Sieve analysis covers particles larger than 0.075 mm (No. 200 sieve), using a stack of sieves and a mechanical shaker. The hydrometer test handles the silt and clay fraction smaller than 0.075 mm, measuring settlement rates in a water column per Stokes' law. Together they give the complete particle-size distribution curve.
How soon can I get results for a fill material check?
Standard turnaround is two to three business days for a full ASTM D6913/D7928 report. If you just need the wash sieve minus #200 percentage, we can often deliver same-day results when the sample arrives before noon. Call us before you send the sample so we can schedule it.
What classification system do you use for the soil?
We classify all soils per ASTM D2487, the Unified Soil Classification System (USCS). This is the system referenced by the IBC and required by Hialeah building officials. Your report will include the group symbol (GW, SP, CL, etc.) and the group name.