Ellis Superfund Site

Medford and Evesham Townships, New Jersey
Environmental Program Management and Technical Analysis
(SIN 899-1 and 899-1 RC)


Brinkerhoff Environmental Services, Inc. was retained to perform vegetative field monitoring at the Ellis Superfund site, situated in Medford and Evesham Townships, New Jersey. The evaluation was conducted to determine if the contamination and extraction/remediation of contaminated groundwater at the site had had any detrimental effect on the on-site wetland communities. A baseline field-monitoring event was conducted in May 2000, with two subsequent annual evaluation events. The entire study was performed within the same area of the site and around the data points that were established during the May 2000 baseline survey.

Brinkerhoff evaluated changes in vegetation at the site as the on-site remediation system functioned over time. The field-monitoring program employed an approach to consider the various factors determining the success or failure of the groundwater remediation program selected. Consideration was given to vegetative cover, soils, hydrology, and other circumstances influencing the project site. The assessment of vegetative cover included an analysis of the vigor and overall health of the planted species, as well as that of colonized species. Dominant species for each stratum were determined by estimating the relative basal area and aerial cover for each respective species. The study area was evaluated for die-off and survival rates of the planted stock and to determine the colonization rate by successional species. Dominant species and approximate percent of aerial coverage were noted for each monitoring season which took place once a year within two weeks prior to and two weeks after the initial baseline survey date.

Groundwater monitoring wells were installed in the areas of the on-site wetlands to monitor the groundwater conditions, specifically in the wetlands areas. These wells were periodically sampled and chemically analyzed to evaluate the conditions of the on-site groundwater. Additionally, the water levels within the wells were measured monthly to evaluate potential changes to on-site groundwater depths. Annual reports were generated for NJDEP submittal summarizing the results of the vegetative monitoring program, and quarterly and annual reports were generated summarizing the results of the detailed groundwater monitoring. Brinkerhoff’s in-house CADD and GIS were used for field mapping and plotting of sample locations.