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The land to be surveyed as part of this project includes about 19 acres of County- owned property extending north of the existing North Regional WWTF to the County' s property line with the Red Stick Golf course and extending west of the North Regional WWTF to a large lake which separates the plant site from other County facilities further to the west. The surveying activities to be performed under this task include the following: • A boundary survey of the expansion site • A topographic survey of the expansion site • A tree survey to locate all single trees 4 inches in diameter and larger and to identify the locations and types of tree clusters throughout the expansion site . • A vegetation survey along the shoreline of the lake to determine the limits and types of existing vegetation for wetlands delineation purposes • Elevations of lake and pond levels • Elevations of top of ground and top of casing at monitoring wells and piezometers • Elevations of above-grade basins , slabs , piping, weirs, and other unit processes at the existing North WWTP for possible hydraulic or process modeling purposes All survey data will be presented in digital files and on maps of the site that will be included with the PER. It is assumed that Indian River County will provide the necessary title or legal description of the land to be surveyed and any associated documents relevant to the work of this project. Task 4 — Subsurface Site Investigations Perform subsurface investigations to define on-site wet weather disposal capacity and to generally define structural foundation requirements on the expansion area of the site . The investigations will include the installation of piezometers and borings , laboratory analyses, groundwater modeling and engineering evaluations to identify on-site wet weather disposal capacity and to define preliminary geotechnical design requirments . A summary of the work activities to be performed include the following: • Perform six SPT soil borings , two to a depth of 100 feet and four to a depth of 25 feet. • Install and develop approximately 200 vertical feet of piezometers throughout the expansion site . Perform field permeability tests in all new piezometers . • Analyze soil samples collected from SPT borings for gradation, porosity and other parameters required for groundwater modeling and geotechnical engineering evaluations . • Develop a groundwater flow model for the North Regional WWTF site and surrounding area to define the available wet weather disposal capacity on the plant expansion site . Simulate up to three hydraulic loading scenarios , including the background (zero loading) scenario . The results of the work will be summarized in a subsurface investigation report that will be submitted to Indian River County as a stand-alone document and incorporated into the S: \ 041077\ IRC North Regional WWFI ' Expansion\ Exhibit A_revl .doc