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ENB Region 2 Completed Applications 08/04/2010

Kings County

Applicant:

Exxonmobil Oil Corp
3225 Gallows Rd
Fairfax, VA 22037

Facility:

Exxonmobil Greenpoint Remediation Project
400 Kingsland Ave
Brooklyn, NY 11222

Application ID:

2-6101-00107/00026

Permit(s) Applied for:

Article 17 Titles 7 & 8 Industrial SPDES - Surface Discharge

Project is Located:

Brooklyn, Kings County


Project Description:

The Department has made a tentative determination to approve this application for a modification of an existing SPDES permit for existing discharges of up to 1.48 million gallons per day of treated groundwater into Newtown Creek (Class I). As part of the Greenpoint Remediation Project, ExxonMobil operates two product recovery and groundwater treatment systems: (1) the On-Site Recovery and Containment System treatment facility located at 400 Kingsland Avenue; and (2) the Off-Site Product Recovery System treatment facility located at 5 Bridgewater Street. The proposed modification is to modify the action level for methyl tertiary butyl ether (MTBE) for outfall 002 from 25ug/l to 90 ug/l. The request was based on a change in the environmental conditions where MTBE from a source apparently not related to the ExxonMobil Greenpoint Remediation Project is being recovered by their system and has significantly and unexpectedly increased the MTBE influent that must be treated. The Department believes ExxonMobil has been proactive in addressing this situation in that they identified a likely source beyond their past operations and have instituted a carbon adsorption pre-treatment on the extracted groundwater from the two wells with the primary impact. The wells with the pre-treatment remove the majority of MTBE prior to combination with the remainder of the flow and are not likely to cause the MTBE elevations above the action level. Other recovery wells also have high levels of MTBE, but pre-treatment can not be applied at this time due to space limitations where the wells are located. ExxonMobil has modified (lowered) groundwater extraction at locations impacted to control MTBE migration and exceedences to some degree without major impact to recovery of the main petroleum product plume.

This permit modification will change the Action Level (AL) for MTBE from 25 ug/l to 90 ug/l based on the influent concentration of MTBE, the removal efficiencies of the treatment system, and a statistical analysis of the operating data of the facility. References to Type II action levels have been removed from this draft permit as the Department's policy has changed so that there is only one type of action level. The compliance schedule in the permit has also been updated to remove completed items.

Availability of Application Documents:

Filed application documents, and Department draft permits where applicable, are available for inspection during normal business hours at the address of the contact person. To ensure timely service at the time of inspection, it is recommended that an appointment be made with the contact person.

State Environmental Quality Review (SEQR) Determination:

Project is not subject to SEQR because it is a Type II action.

SEQR Lead Agency: None Designated

State Historic Preservation Act (SHPA) Determination:

Cultural resource lists and map have been checked. No registered, eligible or inventoried archaeological sites or historic structures were identified at the project location. No further review in accordance with SHPA is required.

Coastal Management:

This project is located in a Coastal Management area and is subject to the Waterfront Revitalization and Coastal Resources Act.

Opportunity for Public Comment:

Comments on this project must be submitted in writing to the Contact Person no later than Sep 03, 2010.

Contact:

Steve A Watts
NYSDEC Region 2 Headquarters
47-40 21ST St
Long Island City, NY 11101
(718)482-4997
r2dep@gw.dec.state.ny.us


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    Division of Environmental Permits
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