Excel's soil gas testing detected methane throughout the landfill and identified elevated concentrations of benzene, vinyl chloride, and other volatile chemicals. The report stated that the findings were consistent with a landfill that had not been properly closed and where waste remained highly concentrated beneath the surface.

Several of the contaminants detected exceeded NJDEP Soil Gas Screening Levels (SGSLs), which are used to evaluate potential vapor intrusion risks. NJDEP vapor intrusion guidance states that exceedances of these screening levels require further evaluation of the vapor intrusion exposure pathway. In the landfill investigation, benzene was detected at concentrations up to 1,086 µg/m³, approximately 68 times higher than NJDEP's residential SGSL of 16 µg/m³. 

Records reviewed for this website do not indicate that a vapor intrusion investigation was performed following these findings.

Excel found arsenic, vanadium, and PCBs in soil above the soil remediation standard, and multiple contaminants, including benzene, arsenic, and lead, in groundwater above groundwater quality standards. The report proposed engineering controls for soil contamination and a Classification Exception Area to address groundwater contamination.

Excel found arsenic in the landfill's cover material above the soil remediation standards. The report also found that the former landfill was not properly capped.

Multiple metals were found in soil at concentrations above ecological screening levels. Elevated metal concentrations were found across the site and persisted to depths of at least 25 feet below the surface.

Excel identified the site's stormwater system as a potential pathway to the Chingarora Creek. One stormwater grate was reported to discharge directly into the creek.

Princeton Hydro identified eroded soil and groundwater movement as potential pathways for contaminants to reach Raritan Bay and Chingarora Creek. The report concluded that ecological risks from groundwater were likely negligible.

Groundwater flows outward from the landfill toward Raritan Bay and Chingarora Creek.