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<br />COMBINED SEWER CONVEYANCE PROJECT – SCOPE OF WORK CATEGORY 2 – FOR OFFICIAL USE ONLY / DISCLOSURE PERMISSIBLE BY LAW 4 <br />a. Gather and review available geotechnical and geologic data in the vicinity of the project location, <br />including prior work at the site by HWA/GeoSciences, Inc. <br />b. Conduct a geotechnical site reconnaissance of the project location. This reconnaissance will be <br />used to identify geotechnical challenges and to assist in planning the geotechnical exploration <br />program. <br />c. Plan and coordinate the geotechnical exploration program for the project. The exploration <br />program is anticipated to consist of up to three Cone Penetration Tests (CPT) and up to three <br />Geoprobe explorations advanced below the existing ground surface (bgs) to provide data for <br />design of deep foundation elements, shoring, and excavations for the proposed improvements. <br />d. Mark the proposed exploration locations and arrange for utility locates using the Utility <br />Notification Center and a private utility locate subcontractor. Conduct a site visit to verify that the <br />proposed locations of the borings are clear of utilities prior to finalizing the exploration plans and <br />mobilizing the equipment. <br />e. Prepare a Field Exploration Work Plan Memoranda for the proposed exploration program that <br />details the type, location, and extent (approximate depth, sampling interval, in-situ testing) of <br />proposed field explorations along with logistics necessary to perform the work such as traffic <br />control and/or staging areas. <br />2. Field Explorations: <br />a. Advance up to three CPTs to depths of approximately 100 feet bgs and three Geoprobes to up <br />to 25 feet bgs to assess the subsurface soil and groundwater conditions at the location of <br />proposed improvements. This task includes a half day of vacuum extraction to preclear <br />explorations to mitigate the risk of damaging buried structures or utilities that may be <br />mis-marked or not located. All drilling spoils will be drummed and transported off site for <br />disposal. Field exploration work will be by a contractor employed by HWA/GeoSciences, Inc. <br />b. Prepare summary boring logs and perform laboratory testing to evaluate relevant physical <br />properties of the site soils. Laboratory testing will include moisture content, grain-size <br />distribution, organic content, and/or Atterberg Limits. <br />c. Based on the CPTs and the laboratory test results on selected samples, generate estimates of the <br />soil strength and other properties needed to evaluate the effects the subsurface conditions will <br />have on the proposed project elements. <br />d. Develop up to geologic cross-sections to show near surface soil conditions to be provided in a <br />geotechnical data report. <br />3. Geotechnical Engineering Design Services: <br />a. Based on the soils encountered along the pipe alignment, determine the Site Class for seismic <br />design and identify design spectral acceleration parameters in accordance with the governing <br />codes. <br />b. Evaluate the susceptibility of the subsurface soils to liquefaction at the location of the proposed <br />structures and assess the potential impacts to the existing structures and proposed <br />improvements. <br />c. Conduct a series of engineering analyses to develop geotechnical recommendations for design of <br />foundations (anticipated to be piles) for structures and pipes, Contractor’s design of shoring for <br />trenches and excavations, and Contractor’s design of temporary dewatering systems. <br />d. Prepare a geotechnical report for the project that contains the results of the explorations and <br />analyses, including descriptions of surface and subsurface conditions, a site plan showing