GTA performed a hydrogeologic evaluation for the use of Class V stormwater inflow wells at an approximately 580,000-SF warehouse/distribution facility located in Northampton County, Pennsylvania. Class V wells can allow for increased developable area due to a reduction in required stormwater basin size, and can reduce the potential for sinkholes. The evaluation consisted of a preliminary feasibility study to evaluate the capacity of underlying bedrock to accept the stormwater volumes to meet the stormwater management demands of the facility. GTA coordinated the drilling and installation of Class V test wells at the site and performed hydraulic inflow testing on the wells to evaluate their capacity. Design inflow rates were estimated via hydrograph analysis and numerical groundwater flow modeling. GTA provided recommendations on the acceptances rates of individual wells, and the anticipated number of wells needed to meet the anticipated stormwater runoff volume.
Our evaluation indicated that stormwater management through the use of Class V inflow wells was feasible. GTA was retained to oversee the drilling and hydraulic testing of additional wells to be put into operation. The Class V well system is operational, conveying stormwater volumes to the subsurface and enhancing groundwater recharge.