eec engineering and environmental consultants

Soil and Groundwater Remediation

Following full characterization of a contaminated site, EEC's staff evaluates applicable remedial solutions. Once a suitable, cost-effective solution is determined, EEC's staff designs, constructs, permits, operates and maintains the remedial unit. EEC installs and operates soil vapor extraction equipment, dual phase extraction apparatus, free product recovery facilities, bioremediation systems, and other equipment for groundwater and soil remediation.

Service Areas Include:

Permitting
Assessments
Monitoring Programs
Closure Plans

Project Experience:

Smithsonian Institution Aquifer Protection Permit/Clean Closure, Amado, Arizona

EEC assisted our client in addressing a notice of violation issued by ADEQ for illegal discharges to the environment from an oil-water separator. EEC conducted an evaluation of the hydrogeology of the site, a records review of the potential contaminants of concern, and a subsurface soil investigation.

Fort Huachuca Former PX Service Station, Fort Huachuca, Arizona

EEC designed an air sparging system for cleaning contaminated groundwater in a perched aquifer at the former PX Service Station. The site is slated to be closed.

Arizona Department of Transportation National Pollutant Discharge Elimination System (NPDES) Compliance, Arizona

EEC managed compliance with the federal NPDES requirements for facility management, contaminated site run-off control, compliance audits, stormwater outfalls, waste areas, and drywells at facilities owned and operated by ADOT. The work included physical site assessments; annual report updates to federal, state, and local authorities; and recommendations for improved NPDES compliance at sites across Arizona.

Canoa Hills Golf Course Bioremediation, Green Valley, Arizona

After the full extent of petroleum contaminated soil was characterized, EEC conducted a cost-benefit analysis to determine the most effective means of remediation. The petroleum contaminated soil was found to be underneath the clubhouse of the golf course and also contained a high percentage of clay. Excavation and soil vapor extraction were found not to be feasible. EEC designed, installed, operated and maintained a bioremediation system. Active bacteria were injected into the soil to enhance the natural biologic degradation. The site was fully remediated in one year.

Raytheon Dual Phase Remediation System, Tucson, Arizona

EEC designed and installed a dual phase remediation system at Raytheon Missile Systems Company. The dual phase remedial system involved the extraction, remediation and re-injection of groundwater, coupled with a soil vapor extraction system. Both systems were installed in one well boring to reduce costs of drilling. The system functioned properly and is still in operation.

Greely Hall Bioremediation System, Fort Huachuca, Arizona

EEC assessed a release of diesel fuel at Greely Hall, located at Fort Huachuca. The contamination was characterized to be 90 feet in depth. Because diesel fuel is relatively non-volatile and it was not feasible to be excavated, EEC proposed, installed, operated and maintained a bioremediation system. The system consisted of five nested inoculation wells with discharge points set at varied depths. The site has been inoculated with active bacteria four times over the past 8 years. The contamination was determined recently to have been reduced from a high of 40,000 mg/kg to 8,000 mg/kg

11th Signal Brigade Soil Remediation, Fort Huachuca, Arizona

EEC assessed and then remediated more than 800 cubic yards of soil contaminated with petroleum products (fuel, oil and grease). The impacted soil was a result of runoff from spills from the 11th Signal Brigade's parking lot and vehicle maintenance facility. EEC excavated the impacted soil down to 35 feet in depth and thermally treated the soil on site. The remediated soil was backfilled and compacted.

Dunlap Oil Free Product Recovery System, Willcox, Arizona

EEC assessed the extent of free petroleum product (both diesel and gasoline) on a 30-foot deep perched aquifer at a truck stop in Willcox, Arizona. EEC then installed free product recovery pumps to remove the free product. Over a one year timeframe, more than 10,000 gallons of product were recovered. The product was used as off-specification fuel for local farmers of the area.



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		Environmental Services Soil and Groundwater Remediation Following full characterization of a contaminated site, EEC's staff evaluates applicable remedial solutions. Once a suitable, cost-effective solution is determined, EEC's staff designs, constructs, permits, operates and maintains the remedial unit. EEC installs and operates soil vapor extraction equipment, dual phase extraction apparatus, free product recovery facilities, bioremediation systems, and other equipment for groundwater and soil remediation. Service Areas Include: Permitting Assessments Monitoring Programs Closure Plans Project Experience: Smithsonian Institution Aquifer Protection Permit/Clean Closure, Amado, Arizona EEC assisted our client in addressing a notice of violation issued by ADEQ for illegal discharges to the environment from an oil-water separator. EEC conducted an evaluation of the hydrogeology of the site, a records review of the potential contaminants of concern, and a subsurface soil investigation. Fort Huachuca Former PX Service Station, Fort Huachuca, Arizona EEC designed an air sparging system for cleaning contaminated groundwater in a perched aquifer at the former PX Service Station. The site is slated to be closed. Arizona Department of Transportation National Pollutant Discharge Elimination System (NPDES) Compliance, Arizona EEC managed compliance with the federal NPDES requirements for facility management, contaminated site run-off control, compliance audits, stormwater outfalls, waste areas, and drywells at facilities owned and operated by ADOT. The work included physical site assessments; annual report updates to federal, state, and local authorities; and recommendations for improved NPDES compliance at sites across Arizona. Canoa Hills Golf Course Bioremediation, Green Valley, Arizona After the full extent of petroleum contaminated soil was characterized, EEC conducted a cost-benefit analysis to determine the most effective means of remediation. The petroleum contaminated soil was found to be underneath the clubhouse of the golf course and also contained a high percentage of clay. Excavation and soil vapor extraction were found not to be feasible. EEC designed, installed, operated and maintained a bioremediation system. Active bacteria were injected into the soil to enhance the natural biologic degradation. The site was fully remediated in one year. Raytheon Dual Phase Remediation System, Tucson, Arizona EEC designed and installed a dual phase remediation system at Raytheon Missile Systems Company. The dual phase remedial system involved the extraction, remediation and re-injection of groundwater, coupled with a soil vapor extraction system. Both systems were installed in one well boring to reduce costs of drilling. The system functioned properly and is still in operation. Greely Hall Bioremediation System, Fort Huachuca, Arizona EEC assessed a release of diesel fuel at Greely Hall, located at Fort Huachuca. The contamination was characterized to be 90 feet in depth. Because diesel fuel is relatively non-volatile and it was not feasible to be excavated, EEC proposed, installed, operated and maintained a bioremediation system. The system consisted of five nested inoculation wells with discharge points set at varied depths. The site has been inoculated with active bacteria four times over the past 8 years. The contamination was determined recently to have been reduced from a high of 40,000 mg/kg to 8,000 mg/kg 11th Signal Brigade Soil Remediation, Fort Huachuca, Arizona EEC assessed and then remediated more than 800 cubic yards of soil contaminated with petroleum products (fuel, oil and grease). The impacted soil was a result of runoff from spills from the 11th Signal Brigade's parking lot and vehicle maintenance facility. EEC excavated the impacted soil down to 35 feet in depth and thermally treated the soil on site. The remediated soil was backfilled and compacted. Dunlap Oil Free Product Recovery System, Willcox, Arizona EEC assessed the extent of free petroleum product (both diesel and gasoline) on a 30-foot deep perched aquifer at a truck stop in Willcox, Arizona. EEC then installed free product recovery pumps to remove the free product. Over a one year timeframe, more than 10,000 gallons of product were recovered. The product was used as off-specification fuel for local farmers of the area.