Task 1: Project Kick-off The contractor shall schedule a kick-off meeting to be attended by Sanborn Head and Associates, Inc. (Sanborn Head), assigned Town staff, the Vermont Department of Environmental Conservation, and other entities as the Contractor determines to be appropriate. The meeting is intended to review the project site, extents of excavation, conditions and restraints, project schedule, lead in-situ treatment protocol, data to be collected, and other project information to make sure everyone is on the same page Task 2: Excavation The contractor will need to excavate approximately 8,300 cy of in place material to the extents of the C&D debris stockpile area. The depth of the excavation will be assessed based on site observations and analytical results; however, for the purpose of this bid should be considered approximately 6-inches below the C&D debris material. The contractor shall confirm the depth of excavation is within the light brown to gray layer of native soil devoid of C&D debris. A Sanborn Head representative will visit the site on the final day of excavation to observe the native soil base below the stockpile and confirm all the C&D debris material has been removed. The C&D debris material will need to be managed as friable asbestos-containing material. Removal of the C&D debris shall be performed by an asbestos-certified excavator operator. Once excavated, the asbestos waste must be properly packaged at the site and must remain intact until disposal at the NEWSVT landfill. Temporary storage of properly packaged asbestos waste by a certified asbestos contractor is permitted without the need to obtain Solid Waste Management Program facility certification if it is stored in a locked, completely enclosed roll-off container or enclosed transport trailer with proper labeling. Task 3: In-situ Lead Treatment As detailed in the attached SSWP, prior to excavation of the C&D debris stockpile, the contractor will excavate four additional test pits around the TP-6 test pit area to be sampled by Sanborn Head and sent for laboratory testing of lead. These results will help assess the lateral extents of the lead contamination and determine the volume of material for in-situ lead treatment. The stabilization of the material is anticipated to be a 1-day event and involves the blending of the reagent, Quikrete® Portland Cement, in-situ with the use of heavy equipment, i.e. an excavator. The contractor will thoroughly mix the soil and reagent until a consistent color and texture is obtained. The quantity of cement needed will be calculated by taking the concentration of lead from the laboratory report, the type of C&D debris and soils in the pile and the volume of the material. It is anticipated a concentration of 3% - 5% by weight of the reagent is sufficient to bind the lead. Following treatment, postconfirmatory samples for TCLP-Lead analysis will be collected by Sanborn Head representing every 100 tons of treated soil to meet disposal requirements.
