Residential Lot Fill Testing
MLA Geotechnical works in conjunction with owners, developers, civil engineers, and contractors to provide developed residential lots that are ready to construct slab on ground foundations. There are many approaches and techniques that can be used in this process. The most common of these techniques are outlined below.
Residential Lot Fill Testing Includes
Approved Fill in accordance with HUD 79G
MLA works with developers and contractors to ensure that fill placement is in general accordance with HUD 79G guidelines such that the fill is approved for supporting slab on ground foundations. This typically includes proof rolling of low plasticity and/or limestone fill layers to verify compaction and/or density testing with a nuclear density gauge to verify moisture and compaction when moisture control is necessary.
Oftentimes, controlling the moisture content in expansive clays is desired. MLA Geotechnical is proficient at determining the extent that moisture conditioning is required and verify that moisture conditioning is done correctly. Verification typically involves nuclear density testing for compaction and moisture control.
In some cases, usually when a homebuilder is buying finished lots, there is a need to reduce the overall potential swell at the site and/or reduce the potential variability in the subsurface moisture conditions. This variability has often been caused by cutting and filling of the site during site development. Water injection is used to both reduce the overall swell potential of the site and to reduce the variability in subsurface moisture. It is important to verify that water injection has been successful with post-injection testing. MLA Geotechnical is adept at both generating water injection recommendations and post-injection verification testing.
MLA Geotechnical requires anytime access to a site while lot fill testing is ongoing. This unfettered access approach allows MLA Geotechnical to serve the client's interest without relying solely on the contractor for scheduling. The resulting letter of completion has monitored the entirety of the fill operation and can confidently conclude that the fill at the site is approved for supporting residential foundations. Many competitors only visit the site when called by the contractor, which results in a letter of completion that generally only states that the tests were run properly.