PSA - Planning Market District Improvements Proj No. 123-053 – American Structurepoint, Inc.

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As indicated above, it is to be noted that a detailed separate scope and fee proposal for the proposed Phase 1 improvements will be submitted to ASI, upon receiving the Stage 1 plan set, and that the investigation currently performed will be used as supplemental information for the project. 2. A truck and/or ATV mounted drill rig with continuous flight, hollow -stem or solid flight augers will be utilized to advance the borings 3. Perform standard penetration testing (SPT) and retain representative soil samples in accordance with Section 3.6.1 of the IGM. Sampling will be performed at 2.5-foot intervals to the boring termination depths. 4. In addition to the soil borings, INDOT guidelines indicate that soundings shall be performed either on or just off of the shoulder. A 24-hour water level reading will be obtained at select roadway borings following completion and removal of the augers. Due to the unknown composition of the subsurface soils, this proposal considers that a slotted PVC pipe will need to be installed in the boreholes to keep the boring open should any granular soil layer, that may cave-in or heave into the borehole be encountered during drilling. 5. In addition to the soil borings and soundings, ASI has requested to obtain pavement cores at every boring performed within the mainline driving lanes along various roadways, within the project corridor. Therefore, a total of eleven (11) pavement cores will be obtained. The pavement cores will be collected with a portable pavement core machine using a 4.0-inch diameter thin -walled core barrel. 6. Per INDOT guidelines, undisturbed Shelby tube sample shall be obtained for in -situ resilient modulus (MR) testing in accordance with Section 3.6.2.1 of the IGM. For the purpose of this proposal, a total of five (5) undisturbed (Shelby tube) soil samples will be obtained. 7. Further, as per the INDOT guidelines, bag samples shall be collected from the subgrade for moisture/density testing in accordance with Section 3.6.4 of the IGM. Therefore, for the purpose of this proposal, a total of two (2) 25-pound bag samples will be retained of representative subgrade soils for moisture/density and resilient testing. 8. The boreholes will be backfilled in accordance with Section 3.16 of the INDOT Geotechnical Manual and INDOT Aquifer Protection Guidelines. Care will be taken to ensure that the boreholes do not settle and create dangerous voids. The pavement will be patched with an equivalent thickness of quickset concrete or cold patch asphalt to match the existing pavement composition. American Structurepoint, Inc. Resource International, Inc. South Bend Market District Improvements Engineering ConsultantsU City of South Bend, Indiana 3 Rii Proposal No. 23-1086 11/07/2023