Specifications include, but are not limited to: Site Characteristics: 3.3.1.1. The sites are non-operational UST facilities with no water, restrooms, or electrical power available for the Contractor to use at the site. 3.3.1.2. Groundcover in the work zones may be one or a combination of asphalt, concrete, or heavy vegetation and debris. 3.3.1.3. It should be assumed for site health and safety reasons, as well as decontamination and disposal purposes, that petroleum contamination will be encountered during site investigation activities. 3.3.2. Site Safety Plan: The contractor is responsible for their company’s own internal site health and safety plan. However, a site health and safety plan does not need to be submitted to the DHEC. 3.3.3. Investigation Activities: Waste products, sludge, contaminated water, and contaminated paving material must be disposed of at a DHEC-permitted treatment or disposal facility. 3.3.4. USTs must be emptied and cleaned by removing all liquids and accumulated sludge. 3.3.4.1. This sludge must be sent to an approved Sludge disposal recycling company. 3.3.4.2. The cleaning methods, quantity of materials removed, and the disposal location must be documented in the reports submitted to the DHEC. 3.3.5. Temporarily excavate only enough soil to remove the emptied and cleaned tanks. 3.3.5.1. Any piping associated with the USTs shall be emptied,capped on both ends, and left in place onsite. 3.3.6. After UST system removal, inspect and document all USTs and exposed piping for indications of failure. 3.3.7. Paving material or construction debris cannot be placed into the excavation and must be disposed of at a facility permitted by DHEC. 3.3.8. Follow all applicable transportation regulations when moving USTs offsite. 3.3.8.1. Contact the local office of the Department of Transportation for additional information. 3.3.9. Assessment Component: An assessment of each site will be required. 3.3.9.1. For each site there will be eight (8) soil samples collected for analysis. Soil borings and grab samples should be taken in the following areas: four grab samples should be taken in the UST basin - one should be from the bottom of the UST basin and three from the sidewalls of the UST basin. These samples should be taken prior to the filling of the empty UST basin. Three soil boring samples should be taken surrounding the UST basin. In the event that there is more than one UST basin, these three surrounding soil borings may be used for additional grab samples within the additional UST basins, with approval from DHEC. One soil boring should be taken as a background sample. All soil borings should be collected in accordance with the UST QAPP 4.0. All soil boring samples should be submitted to a SCDHEC certified laboratory for analysis in accordance with UST QAPP 4.0 Section B1.II.5. If water is encountered during the soil boring activities, a groundwater sample should be collected for analysis. Soil samples should be analyzed for BTEX and Naphthalene, MTBE, 1,2 DCA, and the 8 Oxygenates by EPA Method 8260D, PAHs by EPA Method 8270E and the 8 RCRA Metals by EPA Method 6020B with chromium speciation to analyze for hexavalent chromium. 3.3.9.2. For each site three (3) monitoring wells will be required for the purpose of collecting groundwater samples. This will include installation, sampling, analysis, and abandonment in accordance with the UST QAPP 4.0. It may be determined by DHEC that abandonment of the monitoring wells of a specific site is not necessary. Groundwater samples should be analyzed for BTEX, Naphthalene, MTBE, and 1,2-DCA and the 8 Oxygenates by EPA Method 8260D, PAHs by EPA Method 8270E, EDB by EPA Method 8011, and the 8 RCRA Metals by EPA Method 6020B. 3.3.9.3. Potential Receptor Survey: A potential receptor survey should be conducted for each site in accordance with the UST QAPP 4.0 3.3.10. After UST removal has been completed, the former tank pit must be backfilled according to ASTM standard D698 with clean fill, and compacted to 90 percent of standard proctor as verified by third party compaction results. 3.3.10.1. The site surface area shall be restored to the original condition, including repaving, etc... 3.3.10.2. All sampling analysis should be performed by a DHEC Certified Laboratory.
