Reed Nissan Site Contamination Assessment

e prepared and submitted a site assessment report (SAR) and SAR addendums for Colonial Acquisitions (d.b.a. Reed Nissan), FDEP Facility No. 48-8735601. The SA actions were undertaken in accordance to Chapter 62-770 FAC to evaluate environmental impacts associated with the release of gasoline products from a faulty overfill protection device. We worked to define the vertical and horizontal extent of soil and groundwater contamination, the rate and direction of contaminant migration, and subsurface geological features influencing contaminant migration. This was accomplished by installing a network of shallow 2-inch diameter groundwater monitoring wells in the water table zone in the area of the excavated gasoline UST.

Groundwater flow directions were calculated over several months using depth-to-water measurements from each groundwater monitoring station and top-of-casing elevations from a site survey. Quality of soil was evaluated by collecting soil samples and evaluating them using an OVA-FID. Groundwater samples from the network of site monitoring wells were analyzed by a NELAP certified laboratory for the “BETX” components using EPA Method 8020, Semi-volatile compounds using EPA Method 8310, Lead, and EDB using EPA Methods 6010 and 504.1, respectively. Soil samples were evaluated to develop an understanding of subsurface lithological conditions and potential contaminant flow zones, zones of highly permeable material and zones of lower permeability that would act as confining or semi-confining intervals.

Data was compiled, with some information (e.g., well construction, analytical results, depth to water measurements) being entered into FDEP tables. This and other relevant data collected during site assessment activities was formalized in the SAR. Following review of the SAR by the client, it was submitted to Orange County Environmental Protection Division (OCEPD) on July 10, 2004, for regulatory review.

Regulatory approval of the SA, SAR and SAR addendum was granted on December 1, 2004, with the Site Rehabilitation Completion Order (SRCO) being approved on December 17, 2004. As a requirement of the SRCO, the site groundwater monitoring wells used for evaluating the groundwater impacts and progress of site cleanup efforts were abandoned with the documentation of well abandonment provided to the OCEPD in March 2005.

The SA actions were undertaken in accordance to Chapter 62-770 of the Florida Administrative Code to evaluate environmental impacts associated with the release of gasoline products from a faulty overfill protection device.