During December, National Grid and its consultants completed the engineering design process to support the installation of the groundwater treatment systems, which is one component of the three phased Remedial Action Plan (excavation Interim Remedial Measure, groundwater treatment, and in situ solidification)..  Two oxygen delivery groundwater treatment systems will be installed: one system will be located between Smith Street and Hilton Avenue and the other system will be located between Mirschel Park and Kensington Court (see the figure contained in November 2009 Fact Sheet in the Key Documents section of this web site).  Each groundwater treatment system will include an oxygen generating equipment building enclosure, oxygen delivery wells and underground piping between the enclosure and wells.  National Grid is currently bidding the oxygen delivery system installations to qualified environmental contractors.  Installation of the systems is expected to start in the first quarter of 2010 pending receipt of property access agreements.   

The pre-design investigation for the in-situ solidification (ISS) remediation component of the Remedial Action Plan was completed in 2009.  A review copy of the investigation report was issued to the NYSDEC, NYSDOH, and NCDH in May 2009.  Additional soil borings were drilled near the site in the summer of 2009 to further characterize the extent of contaminated soil in certain areas to support the ISS design.  A revised version of the pre-design investigation report will be issued for NYSDEC review in the first quarter of 2010. Engineering design for the ISS soil remediation phase is scheduled to be completed during the first half of 2010 and National Grid will start soliciting construction bids after completing the ISS design. 

On-going activities at the Hempstead Intersection Street former MGP Site include monitoring and recovery of MGP tar from site related wells twice per month.  Approximately 370 gallons of MGP tar have been collected since April, 2007.  Six (6) additional MGP tar recovery wells were also installed in the summer of 2009 to supplement this component of the Remedial Action Plan.  Groundwater samples are collected and analyzed quarterly to monitor the concentration and stability of the off-site groundwater plume.    

A Public Availability Session was held on December 10, 2009 at Hofstra University to provide residents with information on remedial progress and with the opportunity to meet one-on-one with representatives of the NYSDEC, Nassau County Department of Health and National Grid and its consultants to address any issues or questions about the project.