Commercial 40-Acre Shopping Center Complex

An initial Phase I ESA conducted at a large shopping center complex (40 acres) indicated the presence of 16 underground petroleum storage tanks. Thirteen of the tanks were used to store fuel oil for individual heating systems utilized by the shopping center tenants. Three of the tanks were associated with a former service station, which occupied a portion of the site.

The project was initiated by removing the 13 fuel oil tanks. SES Environmental completed closure assessments for each tank area. Contaminated soil encountered at ten tank locations was placed into a treatment cell, which was constructed behind the shopping center complex. Clean closure was attained at each fuel oil tank area.

Evidence of a significant gasoline release was observed at the former service station tank area. Source impacted soil was removed and placed into a separate treatment cell. A subsequent Phase II investigation indicated the presence of aqueous and free-phase petroleum contamination. A remediation system was designed, fabricated and installed by SES. The system recovered 740 gallons of gasoline product over a period of 18 months, and lowered product levels in the monitor wells from 3.5 feet to less than 1/8". Final residual product was recovered using a program consisting of routine extraction via a mobile, liquid-ring vacuum pump. Aqueous-phase petroleum compounds were addressed through remediation by natural attenuation.

The initial Phase I ESA also indicated a former dry-cleaning operation was present at the shopping center complex. A Phase II investigation in this area of the site revealed the presence of PCE impacted soil and groundwater. The investigation included both lateral and vertical contaminant delineation. Investigation results were used to support a comprehensive risk assessment that included an exposure pathway assessment, soil to groundwater leaching models, and groundwater contaminant fate and transport modeling. The remedial action plan developed for this area of the site consisted of soil vapor extraction to remove PCE from the vadose zone, and plume stability monitoring.

Automotive Parts Manufacturer

SES Environmental provided environmental consulting and field services required for a pre-acquisition investigation at a large metal tooling facility. Investigation was conducted at former USTs, ASTs, metal-plating areas, and on-site buried waste disposal areas. A background assessment was also conducted to characterize site-specific geologic and hydrogeologic conditions, and to also determine background constituent concentrations for comparison to results obtained from several of the investigation areas.

The Phase II investigation was followed by focused remedial efforts at specific areas of the site, including two hazardous waste management units, and several on-site waste disposal areas. Impacted soil in these areas was removed and transported off-site for disposal. Site work was completed under budget, and within an expedited time schedule.