AES Environmental Consulting

Carbonate Geology Assessments

aes was hired to assist the developer’s engineering firm to determine whether the onsite carbonate geology (limestone) would present undue obstacles for site development. Of particular concern was the presence of an existing sanitary sewer main that bisected the site, which when coupled with topography and zoning requirements, limited potentially available stormwater infiltration areas.

aes completed an onsite investigation of the bedrock surface within the areas of the proposed stormwater infiltration BMPs, which included infiltration trenches, sediment forebays, and basin outlets. This detailed investigation consisted of the completion of electromagnetic surface geophysical surveys with recording of integral GPS locations to identify subsurface soil and bedrock anomalies.

aes conducted direct push soil borings to gather subsurface information regarding soil hydrogeologic characteristics. The potential infiltration areas then underwent stormwater infiltration rate testing, the information from which was then completed and incorporated into the overall geologic assessment. An assessment report was prepared and presented to the Pennsylvania Department of Environmental Protection (PADEP) for discussion and consideration.

This assessment report enabled the engineering firm to adjust its proposed plan that was acceptable to PADEP and ultimately enabled the developer to move forward with the development of the property.