Preventative Groundwater Treatment - Aggressive Source Area Chemical Oxidation
A corrective measures study recommended application of In Situ Chemical Oxidation (ISCO) using activated Klozur SP sodium persulfate to destroy residual TPH-D mass. A Soil Oxidant Demand (SOD) test was performed on soil and groundwater from the site to ensure sufficient oxidant would be applied to address both the non-target and target demands. Appropriate permitting for injections was secured. Preparation of field equipment, including injection well installation was completed prior to injection. The first injection of approximately 94,635 liters of 20% Klozur SP and 20 % NaOH solution was performed in 2016, followed by monitoring of oxidant persistence for 60 to 90 days. Subsequent TPD-D monitoring indicated a concentration reduction between 50% and 95% in treated soils. The TPH-D mass reduction was more pronounced along the perimeter of the targeted injection area. A second round of ISCO injections focused on the remaining TPH-D mass is planned, and results will be presented.