Project:
Clarendon Road
Location:
Queens, NY
General Services:
NYSDEC Spill Site. Excavation of Contaminated Soil and Underground Storage Tanks, Remediation of Groundwater and Vapor Assessment.

Hydro Tech performed the removal of underground storage tanks (USTs), and soil and groundwater remediation during the re-development of a former gasoline station into a commercial strip mall. The remediation was successfully coordinated with the New York State Department of Environmental Conservation (NYSDEC) and two NYSDEC spill numbers were closed. The remediation was beneficial to the site development in that the UST and contaminated-soil excavations were generally limited to basement foundations, and groundwater was treated through monitoring and natural attenuation. In other words the remediation did not impact upon the development of the property.

Hydro Tech commenced work with a Phase I and Phase II during late 2005, early 2006 which identified gasoline and fuel oil USTs, which were utilized during former gasoline station and auto repair shop operations. In February 2007, Hydro Tech excavated and removed twenty-one (21) 550-gallons gasoline USTs, one (1) 4,000-gallons gasoline UST and three (3) 550-gallons fuel oil USTs. Following removal of the USTs, petroleum contaminated soil was excavated. Hydro Tech then completed the remedial sampling of the site and submitted remedial closure reports to the NYSDEC. With the NYSDEC approval the property was then developed and occupied with a commercial strip mall and parking lot.

In November 2007, and in coordination with the NYSDEC, a groundwater monitoring well network was established for the Site as part of a long term monitored natural attenuation (MNA) program for dissolved gasoline compounds. Due to ongoing development at the Site and no access to downgradient portions of the property, Hydro Tech worked with the NYSDEC to have wells installed downgradient of the Site, at an adjacent High School parking area. These monitoring wells were monitored on a monthly basis and sampled quarterly as part of the MNA. Quarterly Status Reports (QSRs) were prepared and submitted to the NYSDEC. As per NYSDEC recommendations, a vapor survey of the basement of the High School was conducted during February 2008. The MNA program was performed from November 2007 to July 2009. Based on the vapor results and low to non-detect levels of gasoline compounds in the groundwater beneath the parking lot for a period of six (6) quarters, Hydro Tech recommended closure of the Spill files in July 2009. The NYSDEC concurred with our recommendations, and subsequently closed the spill files in October 2009.