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Janet Dunlap, P.E. Geosynte& 2 January 2008 consultants Page 3 Task 2 — Supplemental Soil Sampling This task consists of mobilizing to the site and collecting soil samples from six locations at three depth intervals, a background sample and one duplicate quality assurance sample (20 total samples) around the former cattle dipping vat. The soil samples will be located at the corners and sides of the proposed excavation area of 25 feet (ft) x 75 ft around the former cattle dipping vat as shown on Figure 1. The depth intervals for collection of the soil samples are 0 to 0.5 ft below land surface (BLS), 0.5 to 2 ft BLS, and from immediately above the water table (approximately 6.0 to 6.5 ft BLS). The soil samples will be collected in accordance with FDEPs Standard Operating Procedures (SOPS), February 2004. Soil samples will be analyzed by a fixed based laboratory for arsenic by EPA Method 6010. Additionally, two soil samples will be collected at the locations with the maximum historic arsenic concentrations for toxicity characteristic leaching procedure (TCLP) testing (required date for disposal of soil at the IRC landfill). Task 2 Contingency Costs. In the event additional soil sampling is required to complete the arsenic delineation to background or residential SCTLs, contingency costs are provided for the collection of up to 12 additional soil samples for arsenic analyses. The Task 2 contingency costs will not be utilized without prior IRC notification and approval. Task 3 — Interim Source Removal Work Plan Once delineation of the arsenic impacts has been completed, an ISR Work Plan will be prepared in accordance with Chapter 62-780, Florida Administrative Code (FAC). The ISR Work Plan will contain all pertinent excavation and groundwater removal and transportation details. A draft of the ISR Work Plan will be submitted to IRC for review. Any comments from IRC will be incorporated into the final ISR Work Plan. The final ISR Work Plan will be signed and sealed by the Florida Licensed Professional Engineer (P.E.) in responsible charge of the project and will be submitted to the FDEP with a notification of the proposed voluntary cleanup activities. Task 4 — Excavation Prior to initiating the perimeter of excavation activities, the proposed work Geosyntec's subcontractor will install a silt fence around area and grub all treesibrush located in the proposed excavation area. The tree/brush will be removed from the site and transported to the IRC X R07084/CCR08003. DOC Engineers I scientists I iunuvators