2014-115 - Laserfiche WebLink

Home Browse Search

Brownfields Site Assessment June 2014 South Gifford Road Landfill, Vero Beach,Florida 2. SITE SETTING AND BACKGROUND 2.1 Site Location and Description The Site is located in east-central IRC in Section 28, Township 32S, Range 39E (Figure 1). Various commercial, industrial, and undeveloped areas border the Site to the south, east, and west, with 41st Street bordering the Site to the north. A Surrounding Land Use Map including parcel boundaries is included as Figure 3. 2.2 Site Background Based on historical documents, commercial, industrial, residential, and agricultural wastes were disposed of in the landfill from approximately 1960 until 1977. Records indicate that the waste cells were excavated to approximately 8 ft below the original land surface grade; however, interviews with onsite workers indicate that, in some areas, the waste cells may have extended more than 10 ft below land surface (BLS), below the water table. The waste cells varied in length from approximately 200 to 500 ft. Waste disposal activities were terminated in August 1977, and the final landfill cover, which was comprised of approximately 2 ft of clean fill material pursuant to the permit, was constructed in 1978. Pine foliage was planted in various areas of the site in 1979. A 2008 aerial view showing the Site boundaries is provided on Figure 2. The Site is currently vacant with the exception of the use of the northern portion of the Site as a laydown yard by IRC and a residential convenience center where residents can drop off waste materials. 2.3 Summary of Previous Investigations and Remedial Actions A source investigation was initiated by Geosyntec in 1999, after volatile organic compounds (VOCs) were discovered in groundwater. The results of the source assessment activities indicated a VOC contamination source in the waste material approximately 12 ft BLS and identified a chlorinated VOC groundwater plume approximately 1-mile in length extending downgradient in the direction of groundwater flow. An Interim Pump and Treat (IP&T) system was installed to provide hydraulic containment of the high concentration area of the dissolved groundwater plume and groundwater monitoring activities were initiated in December 2002. A Remedial Action Plan (RAP) was developed in July 2003, concurrent with the groundwater monitoring activities and IP&T system operation. The RAP outlined a proposed remedy for the VOC-impacted area of the Site, including aggressive source removal, expansion of the existing IP&T system, construction of an infiltration gallery for effluent re-injection, and monitored natural attenuation for the downgradient FR07661i 3 7/6/2014