 |
|
|
Sinkhole Repair |
Sinkhole Investigation & Repair
Client: Moravian Manor
|
ARM Group Inc., (ARM) was retained by Moravian Manor to provide geotechnical engineering services related to the design and construction of a three-story addition to the primary care facility. Construction included expansion of an existing stormwater management basin and installation of utility lines. Much of the Lititz area, including the Moravian Manor campus, is underlain by sinkhole-prone limestone. Numerous sinkholes were encountered during construction, particularly in the area of the basin expansion, but also within utility trenches and building foundation excavations.
ARM’s services included investigation of the sinkholes, as well as on-site engineering supervision during sinkhole repair activities. Repair methods used at the site included the construction of inverted filters consisting of graded aggregate layers. |
| Due to concerns over continuing sinkhole activity within the stormwater basin, Moravian Manor asked ARM to perform a geophysical investigation in the area of the basin to identify subsurface conditions consistent with incipient sinkholes. ARM performed a subsurface conductivity survey with a Geonics EM31 Terrain Conductivity Meter. The effective depth of exploration using this equipment was approximately 18 feet. |
 |
Results of the EM31 Survey |
|
|
EM-31 data was collected in conjunction with the use of a Global Positioning System (GPS) to record the location of the EM31 at one second intervals. EM and GPS data were digitally recorded and down-loaded to a field computer for quality assurance and preliminary interpretation. Results of the conductivity survey are presented in the figure above. These results were used to guide excavation and repair of incipient sinkholes.
If you would like additional information about this project or any of ARM's projects or services please send an e-mail to info@armgroup.net.  View Additional Projects |
|
|
| |
|
|
|
|
|
 |
