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Fresh Water Surface Impact


Subsurface investigation work conducted by Suffolk County Department of Health Services (SCDHS) in 2001 revealed elevated concentrations of MTBE and tert-amyl methyl ether (TAME) in groundwater. Subsequent investigations contracted by the NYSDEC delineated an extensive fuel-spill related plume migrating toward the head waters of a sensitive fresh water stream.

EAR was contracted to continue with the subsurface investigation, supplement the current monitoring network, and investigate the impact to the River. EAR’s investigation included a gain/loss study using stream bed piezometers and seepage meters installed by EAR and direct push method sampling throughout the river. The results from these studies provided the NYSDEC with the necessary information required to conclude that the discharge provided an unacceptable risk to the environment. EAR was then instructed to implement an interim remedial measure to prevent further impact to the River.

EAR designed a dual air sparge/soil vapor extraction curtain and conducted a pilot test to confirm the preliminary design. The entire system, including system components was installed in a subsurface chamber. This design resulted in minimal impact to the park and nearby residents where the stream impact was located, while effectively addressing the contaminant plume.