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<br />Lexington-Broadway Stormwater Imp. Phase 1 8 Scope of Services <br />E. Soil cuttings, purged groundwater (if encountered), and decontamination water from any <br />suspect contaminated borings will be placed in steel 55-gallon drums. These <br />investigation-derived waste (IDW) drums will be stored at the proposed stormwater <br />treatment facility location, or at an adjacent location as provided by the City, pending <br />chemical analysis. Once laboratory results for the environmental samples are obtained, <br />HWA will coordinate the disposal of drummed IDW using a waste disposal <br />subcontractor. Waste profile documentation required for disposal of the IDW will need to <br />be signed by the property owner or a City representative. <br />10. Based on the results of the fieldwork from this project and the preliminary design <br />geotechnical investigation, HWA will prepare a geotechnical engineering analysis to <br />evaluate and provide design recommendations for the following: <br />A. Recommendations for shoring and foundation support of vaults, retaining walls, footings <br />and foundations, and stormwater water quality treatment concrete structures. <br />B. Recommendations for earthwork, including suitability of on-site soils for reuse, structural <br />fill placement and compaction, and dewatering considerations. <br />C. Recommendations for pipe installation including trench shoring, buoyancy, preventing <br />flow migration, trench dewatering, recommendations for pipe bedding and backfill, and <br />suitability of in situ soil for reuse and trench support. <br />D. Based on the geologic information in the vicinity of the improvements, determine the site <br />class for seismic design and generate seismic design parameters. <br />E. Evaluate the susceptibility of the subsurface soils to liquefaction and assess the potential <br />impacts to the proposed improvements. <br />F. HWA will prepare a draft and final Geotechnical Engineering Report presenting the <br />results of field studies. This report will also provide a summary of the environmental <br />conditions encountered at locations sampled, environmental laboratory test results, and <br />recommendations for soil and groundwater handling and disposal during construction <br />activities based on the information obtained during this investigation. The data report will <br />include the following information: <br />i. A description of the geotechnical site exploration program <br />ii. The logs of all borings and other site investigations, including any existing <br />subsurface geotechnical data <br />iii. Groundwater measurements <br />iv. A description of the geologic and seismic settings for the corridor <br />v. Results of all field tests conducted. <br />vi. Installation details, logs, and measurement results of all geotechnical field <br />instrumentation installed for the project or existing geotechnical instrumentation and <br />measurement results usable for the project.