Long Term Remediation O & M

SENCON has conducted Monitored Natural Attenuation remediation activities at multiple sites at MCB Camp Lejeune and the adjacent MCAS New River, North Carolina. Field activities include periodic sampling of surface water and groundwater. Low flow purging and sampling techniques have been employed for groundwater sampling conducted at site monitoring wells. Indicator parameters, including pH, temperature, specific conductance, turbidity, oxidation-reduction potential, and dissolved oxygen were recorded in the field at each sampling location. Field analyses using colorimetric and photometric methods were conducted for alkalinity and ferrous iron. Laboratory analyses varied by site, but generally included volatile organic compounds (to evaluate concentrations of the primary constituents of concern and their degradation products [mostly halogenated volatile organic compounds] and several parameters included to evaluate natural attenuation mechanisms [e.g., nitrate/nitrate, sulfate, sulfide, and, at certain locations, hydrogen] or the degree to which natural attenuation was degrading the primary constituents of concern [e.g., methane, ethane, and ethane]).