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An old earthen dam displayed signs of seepage. One state agency wanted to breach and rebuild it immediately, and another agency wanted to repair it. RETTEW was tasked with detecting areas of seepage, soil piping, or erosion of materials beneath the dam. Site conditions were grassy embankments, a concrete spillway, and suspected sheet piles from…
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An engineer was investigating whether a homeowner’s insurance policy would cover damages to their property due to a sinkhole. To provide confident detection of potential subsurface features and properties associated with the sinkholes, RETTEW applied several complementary geophysical techniques. We used microgravity mapping to detect and delineate soil cavities or zones of low-density soils. We…
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A church was concerned that its walled cemetery excluded some very old unmarked graves, likely containing wooden caskets, given their age. To resolve this uncertainty, RETTEW conducted a ground penetrating radar (GPR) survey to detect any anomalies that might represent unmarked burials. RETTEW scanned the areas just outside the cemetery boundary walls with a digital…
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A solar farm was expanding onto a hill where a limestone rock outcrop was observed. This raised concerns about shallow rock that could impede installation of the driven rods that support the solar panels. In soil, the rods need to reach a specified depth to prevent wind from lifting the panels. If the rock is…
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RETTEW’s Geophysics team recently assisted a client with a tunneling project. The tunnel path was at a depth at which surface geophysics could not resolve potential small zones of concern, including low-stiffness weathered rock that might require special support, and water-bearing seams that could flood the opening. The required resolution could only be achieved using…
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Gasoline that spills on a pervious surface or leaks from an underground storage tank will infiltrate downward until it encounters the groundwater table. Since gasoline is less dense than water, it floats as a light non-aqueous phase liquid (LNAPL) plume. In a boring at an active service station, our client encountered floating gasoline, which caused…
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Earthquake-resistant construction is expensive, especially in a place like the New York metropolitan area. A health care client was looking for the most cost-effective design for a critical care facility while incorporating the appropriate degree of earthquake resistance. In seismically active areas, including the NY metro area, there is a tendency to overconstruct. This is…
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A growing landfill required constant monitoring along its periphery to ensure aging liners and containment systems were functioning as designed. New monitoring wells were needed in key locations at proposed expansion points. The geologically complex area required in-depth analysis of migration flow paths to effectively site the monitoring wells. Using borehole geophysics, we detailed planar-feature…
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Our client experienced poor surface drainage and subsidence along a roadway in central Pennsylvania. These occurrences made road conditions dangerous. RETTEW/Enviroscan’s geophysics team surveyed the terrain to locate the source of the problem. The unique site conditions of this project required a combination of geophysical techniques to determine the proper solution. We performed four different…
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Tell us about a hobby you’re passionate about outside of work. I belong to a volunteer women’s service…
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One of RETTEW’s Project Managers, Melissa Kelly, is participating as a mentor in the Lancaster Chamber of Commerce…
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