Item 17 - Agreements for On-Call Geotechnical Engineering Services

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provided to us. In addition, existing records of all boring locations will be cleared of public utilities and agencies based on Underground Service Alert (USA) markings and notification. Based on project jurisdiction and scope, we will obtain required permits for the services proposed. As an added assurance against damaging potentially expensive underground improvements, we propose to meet with the site's facilities representative, if available, to review plans of existing utility lines to further define our proposed boring locations where underground utilities are suspected. As we understand Kleinfelder may be responsible for any damage to utilities during field operations, geophysical utility locating services will also be provided to reduce the risk of subsurface utility interaction. Field Exploration We anticipate utilizing the most appropriate field exploration equipment for the project site and intended development. Since Kleinfelder has the ability to deploy many different types of field exploration equipment, we believe that we can provide the City with the most cost-efficient and timely response to virtually any project need. To obtain the most representative samples and thereby characterize the subsurface conditions, we propose to explore the subsurface conditions by using the appropriate small -diameter hollow -stem, rotary -wash borings or large -diameter (24-inch) bucket -auger borings. We believe that these techniques will provide the advantage of both directly obtaining intact samples (rotary wash borings) for seismic characterization and laboratory testing, while providing engineering geologic data (bucket auger borings) necessary for possible deeper cuts in the underlying bedrock materials, and for use in characterizing the soils for storm drain projects. The potential for groundwater -related conditions such as dewatering, seepage, etc. can also be evaluated. We will place the borings in locations where best suited for the features of the proposed site development, in conjunction with the anticipated cuts and fills. Large -diameter borings often will be placed primarily in areas of deeper cuts, to characterize the excavation and stability properties of these materials. The small -diameter borings will be placed throughout the site to provide engineering data for seismic and strength characteristics development, infiltration testing, and evaluation of liquefaction potential. This combination of exploration techniques will also be more efficient, allowing for better coverage of the site with more exploration points. Our borings will be logged by our experienced staff engineers/geologists who will obtain soil samples, record blow counts of the samples, and other pertinent data. We anticipate utilizing a combination of SPT and California/Shelby tube sampling procedures, depending on the materials encountered. The borings can be backfilled with the soil removed during excavation, or with cement/bentonite slurry, if environmental contamination issues are a concern. Laboratory Testing Laboratory testing will be performed on selected samples obtained during the field exploration to assess the physical characteristics of the subsurface material. We anticipate the testing will typically include in -place unit weight and moisture content, sieve analyses, expansion index, shear strength (direct shear, unconfined compression, triaxial), sieve analyses, consolidation, soluble sulfate, resistivity and pH, and Atterberg Limits, and CBR/resistance value (R-Value) for pavement design. We have the capability to perform triaxial testing and permeability testing of soils through a local subcontracted laboratory. Engineering Analysis and Deliverable Based on the results of the field investigation and laboratory testing, geotechnical engineering analyses will be performed to provide the basis for providing engineering recommendations for site preparation and foundation design. Typical analyses will include, but not be limited to, bearing capacity, settlement, temporary construction dewatering, lateral earth pressures, pavement design, soil liquefaction, seismic -induced settlement, deterministic or probabilistic seismic KLE/NFELOER City of Santa Ana On -Call Professional Engineering Services - RFP No. 23-123 1 Page 22 enynr aeopre. arger sowr;or.