HWA GeoSciences Inc 8/23/2018 Amendment 2

July 30, 2018 HWA Project No. 2016-044-21 drillers to determine the best drilling equipment for each exploration, given the site constraints and exploration objectives. • Generate Field Exploration Figure: HWA will generate a field exploration figure that outlines the locations of our prosed field explorations. This figure will show the locations of our proposed explorations, the staging areas required to complete the explorations, and the path anticipated to access the drilling locations. • Conduct Utility Locates: Prior to conducting our field explorations HWA will call for utility locates. In addition, HWA will also retain a private utility locating service to clear the proposed exploration locations on private property and coordinate with the owner's representative regarding utility layout • Conduct Supplementary Subsurface Explorations: Upon approval, HWA will conduct the proposed supplementary field exploration program,which includes a total of up to four (4) borings. The approximate location of our proposed limited access machine drilled borings are indicated in Figure 1. Each of these borings will be drilled with a limited access rubber tracked bobcat mounted drill rig or a tripod mounted drill rig. Each boring will be drilled to a depth of 25 feet or 5 feet into very dense glacial soils, whichever is less. We expect that drilling these borings will take approximately 1 day to complete. • Generate Boring Logs and Assign Laboratory Testing: HWA shall prepare summary boring logs and perform laboratory testing to evaluate relevant physical properties of the site soils. Laboratory testing will include moisture contents, grain-size distribution, and Atterberg Limits. All laboratory testing will be performed in general accordance with the corresponding ASTM procedures. • Update Geologic Cross-Section: HWA will update the existing geologic cross-section with the supplementary soil information and the updated utility alignment. This updated profile will be used for evaluation of various aspects of the project. Geotechnical Final Design: • Review As-Built Drawings: HWA will review as-built drawings of existing buildings to provide recommendations for protection of existing buildings during utility installation. • Generate Seismic Design Parameters: Based on the geologic cross-section along the alignment, HWA shall determine the Site Class for seismic design. The design spectral acceleration parameters will be provided for use in the design of the lift station structure. HWA Scope