Environmental Remediation and Financial Services, Case Studies

September 9, 2010

Gas Stations Case Studies

Listed below is a representative sampling of Gas/Service Station CASE STUDIES performed by ERFS. For additional details and technical data, contact an ERFS representative at 1-866-855-ERFS.


Industry:	Gas/Service Stations

Challenge:	Conversion from existing pump and treat system that failed to achieve goals

Solution:	Five-year, performance-based program by ERFS to take all sites at all levels of contamination and degrees of assessment to NFA status is on track to meet or exceed goals


	Site Setting or Use:	Portfolio of 31 Individual Gas Stations
	Location:	New Jersey
	COCs:	BTEX, MTBE, PAH
	Treatment Interval Soil Type:	Medium sand
	Depth to Groundwater:	5 to 10 ft bgs
	Plume Size:	5,000 SF to 25,000 SF
	Injection Array:	Convert existing P& T for injection; install vertical and lateral treatment wells
	Baseline Conditions:	Varying from LNAPL to dissolved levels 5X cleanup goals
	Current or Final Conditions:	1 site closed; 15 sites in remediation or closure monitoring. All site assessments complete


Industry:	Gas/Service Stations

Challenge:	Conversion from existing pump-and-treat system that failed to achieve goals

Solution:	First Pay-for-Performance program in PA with "not-to-stop" contracting by ERFS succeeds in remediating entire portfolio of gas stations


	Site Setting or Use:	26 Gas Stations in PA - USTIF Program
	Location:	Pennsylvania
	COCs:	BTEX, MTBE, PAH
	Treatment Interval Soil Type:	Fine sand and clay to silt stone bedrock
	Depth to Groundwater:	5 to 35 ft bgs
	Plume Size:	5,000 SF to 25,000 SF
	Injection Array:	Props.* and conversion of existing P&T for injection, installing vertical and lateral treatment wells
	Baseline Conditions:	Varying from LNAPL to high dissolved levels
	Current or Final Conditions:	Over 20 sites in full closure or closure by risk assessment of low levels (< 20 ppb)


Industry:	Gas/Service Stations

Challenge:	Takeover of failed cleanup project

Solution:	Modify existing SVE system and use new wells to treat residual areas not fully remediated by prior vendor. Treatments for all 3 projects completed within average 3 - 6 month period, after which all reached closure.


	Site Setting or Use:	3 Gas Stations in FL Petroleum Cleanup Program
	Location:	Florida
	COCs:	BTEX, MTBE, PAH & lead
	Treatment Interval Soil Type:	Fine to medium sand
	Depth to Groundwater:	3 to 8 ft bgs
	Plume Size:	2,000 SF avg.
	Injection Array:	Converted SVE laterals, new and existing RWs and IWs
	Baseline Conditions:	Petroleum compounds (inc. lead) at 5X to 10X cleanup goals after previous remediation attempt
	Current or Final Conditions:	Closure documents issued by FDEP after Q4 post-treatment monitoring


Industry:	Gas/Service Stations

Challenge:	Difficult site conditions due to proximity to waterway

Solution:	Use of vertical injection wells for treatment with performance contract to reach closure goals for residual groundwater plume


	Site Setting or Use:	Gas Station headquarters site near St. Johns River
	Location:	Florida
	COCs:	BTEX, MTBE
	Treatment Interval Soil Type:	Very fine sand and silt
	Depth to Groundwater:	3 ft bgs
	Plume Size:	3,000 SF
	Injection Array:	8 vertical injection wells
	Baseline Conditions:	BTEX and MTBE - 2X to 10X GCTLs
	Current or Final Conditions:	Injection wells installed; three treatments completed; sampling in progress


Industry:	Gas/Service Stations

Challenge:	Remediate abandoned gas station site for redevelopment

Solution:	LNAPL resolved after only one treatment with more than 85% reduction in overall levels in less than 12 months


	Site Setting or Use:	Abandoned Gas Station
	Location:	Ohio
	COCs:	BTEX, PAH, LNAPL
	Treatment Interval Soil Type:	Silty clay over sandstone bedrock
	Depth to Groundwater:	8 ft bgs at bedrock interface
	Plume Size:	12,000 SF
	Injection Array:	6 Props.*
	Baseline Conditions:	2 ft LNAPL, BTEX > 100,000 ug/l
	Current or Final Conditions:	No LNAPL remained after 1st treatment - 95% reduction;all wells meet OH goals


Industry:	Gas/Service Stations

Challenge:	Client requests treatment demos for comparison to air sparging

Solution:	Chemox results in significantly lower BTEX / higher DO levels and more favorable bio parameters (including high plate counts) after 2 treatments


	Site Setting or Use:	Abandoned Gas Station
	Location:	Pennsylvania
	COCs:	BTEX and MTBE
	Treatment Interval Soil Type:	Clay with sand and debris
	Depth to Groundwater:	4 ft bgs
	Plume Size:	4,000 SF demo area
	Injection Array:	20 vertical wells per client design
	Baseline Conditions:	BTEX at 50,000 ug/l or more
	Current or Final Conditions:	BTEX at < 20,000 ug/l after 2 demo treatments

* Propagation delivery devices

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