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Johnson Design Associates, Inc. has a fully equipped soils lab on site with respect to testing for the permeability of a given soil, including grain size analysis, percolation rate and hydrometer testing. We also provide sieve testing for various applications depending on the needs of our clients which include other engineering firms, septic installers, building contractors, local health departments and single family home owners. Because we maintain our own soils lab and a full time lab technician, we are able to respond to our clients need in a timely fashion. If you have any questions about soil testing, please email us at
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