3.20 NSD20 - Naval Supply Depot
No site history is provided.
All the site history information provided by the EQS could be gathered from the name of the site. "Information regarding the type of hazardous materials and where they were stored was not available." In light of the lack of historical information an inadequate level of sampling was performed.
Sample density.
Site 20 is described as 62.8 acres in size. Ten surface soil samples were collected at the facility, or an average of one soil sample per 6.3 acres. This sample density results in a high potential to overlook a hot-spot and mischaracterize the environmental condition of this site.
Potential for contaminant migration from nearby sites.
The potential for contaminant migration from nearby sites was not considered. Site 20 is located adjacent to Site 44, Old Power Plant.
Volatile Organic results in soils are inconclusive.
Only shallow soil samples were collected from this site.
Metals in excess of background.
Concentrations of several metals exceeded to the background concentrations and warrant further investigation into the source of this contamination.
Volatile TPH Analysis results rejected.
Results of TPH analysis, C6 to C9 fraction, during the initial sampling round were rejected during data validation because samples were analyzed past twice the holding time. During the confirmation round no samples were analyzed for this TPH fraction.
High levels of petroleum warrant follow-up groundwater investigation.
Concentrations of petroleum hydrocarbons at two separate sample locations exceeded screening criteria. Determination of the source and extent of the contamination needs to be performed. Further investigations should investigate potential impacts to groundwater. This area has not been recommended for any further action.
