NJ Geotechnical Report
Search any NJ address. Get nearby NJDOT boring logs, soil profiles, bearing capacity estimates, and foundation recommendations — free.
Frequently Asked Questions
What is a geotechnical report?
A geotechnical report evaluates subsurface soil and rock conditions at a development site. It includes boring log data, soil classifications, SPT N-values, groundwater depth, bearing capacity estimates, and foundation recommendations. This information is essential for determining foundation type and estimating construction costs.
How are boring logs used in development?
Boring logs document the soil layers encountered when drilling test holes. Developers use this data to understand subsurface conditions — soft clays, dense sands, rock, or groundwater — and determine whether standard footings will work or if deep foundations like piles are needed, which significantly impacts project cost.
What is an SPT N-value?
SPT (Standard Penetration Test) N-value is the number of blows required to drive a split-spoon sampler 12 inches into the soil. Higher values indicate denser, stronger soil. Below 10 suggests soft conditions, 10-30 is medium density, and above 30 indicates dense soil suitable for foundations.
Why only New Jersey?
This tool uses the NJDOT Geotechnical Data Management System (GDMS), which contains over 49,000 boring log records from state transportation projects — one of the most comprehensive public boring log databases in the country. We plan to expand to more states as databases become available.
How accurate is the data?
Boring log data comes directly from the NJDOT GDMS. Soil profiles are extracted from official PDF boring logs using AI. While nearby borings provide representative subsurface information, actual conditions at your specific site may vary. A site-specific geotechnical investigation is always recommended before construction.
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