Surface and Subsurface Hydrology and Drainage Design
Advanced Geophysical Exploration Techniques
We are all well-versed in several geophysical methods, equipment, and data reduction techniques useful in geotechnical exploration and evaluation. Geophysical exploration is an non-invasive tool which uses the measurement of material properties to help assess potential subsurface conditions. The field of geophysical exploration has grown substantially over the past 30 years, and has earned a good reputation as a relatively cost-effective, non-invasive tool to help supplement traditional subsurface exploration techniques and/or provide stand-alone subsurface information. Despite their obvious benefits, geophysical exploration techniques should not be viewed as an equal alternative to standard subsurface exploration and careful planning should be used at the beginning of a project to determine what the most appropriate exploration technique/method may be given the assumed subsurface conditions. Geophysical exploration will not always be appropriate for a given project.
Foundation Seepage and Drainage
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Infiltration and Perc
An infiltration/percolation test is a test to determine the absorption rate of soil for a septic drain field. The results of a percolation test are required to properly design a drainage system. We provide infiltration testing service in general accordance with the falling head percolation test procedure outlined in Table 3.9 of the EPA Onsite Water Treatment & Disposal Systems Manual (as specified in Paragraph 9 of Section 9.2.1 of the Municipality of Anchorage Drainage Design Guidelines). We will also record groundwater level as outlined in Section 9.2.1 of the MOA 2007 Drainage Design Guideline (DDG) manual.
Septic System Design
On-site wastewater disposal systems provide an important, economically efficient, and relatively clean and healthful method of wastewater disposal in areas of the municipality not served by an integrated sewage collection and disposal system. Upon suitable percolation rate, we provide septic system design (both primary disposal field and secondary disposal field) according to MOA Chapter 15.65 Wastewater Disposal Code. Our design complies with MOA regulation and will be approved by MOA for construction.
Surface Hydrology Assessments and Analysis
TFT has performed hydrologic assessments for a variety of project including bridges, reservoir expansion projects, spillway analysis, and open-pit gravel mines. Our personnel are trained in methods of hydrologic analysis and computer aided hydrologic modeling.
Drinking Water Well Installation
We have developed excellent relationships with some of the most qualified water well drilling outfits in Alaska. We have also coordinated and directed the installation of several domestic drinking water wells for both residential and commercial service across Alaska. We work closely with client, driller, and city/state regulatory agencies to obtain the proper authorization and permits to install domestic water wells. We also provide well logging services, well adequacy testing (i.e. pump tests) to help determine the output of a given water well, and can collect water samples for water quality analysis, etc.
Aquifer De Watering Plans
We can perform aquifer tests to determine the in-situ permeability coefficient of the subsurface soils, which aids in the design of dewatering systems for foundation in soils with shallow groundwater.
