Item 17 - Agreements for On-Call Geotechnical Engineering Services

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Grading and Earthwork: We will present earthwork criteria, including recommendations for new footing subgrade preparation, recommendations for removal of unsuitable soil or fill, utility trench backfill, surface drainage, and landscaping considerations, as necessary. Recommendations for import soil engineering and compaction criteria will also be provided. Foundations: Utilizing data collected during our exploration, we will recommend allowable vertical and lateral bearing pressures for use in designing new spread -footing foundations. We will also provide foundation design criteria including recommendations for minimum size, embedment depth, allowable vertical and lateral capacities, and expected total and differential settlements. In addition, foundation recommendations for light poles footings, fence post footings, and other free-standing canopy structures will be provided. Lateral Earth Pressures: Recommended lateral earth pressures for active, at -rest and passive conditions, and soil friction will be provided for use in retaining wall design. Slabs -On -Grade: We will present concrete slab -on -grade design criteria, including recommendations for subgrade preparation, moisture vapor mitigation and if necessary, non -expansive fill. Asphalt Concrete and Portland Cement Concrete Pavements: We will provide recommendations for AC and PCC pavement sections based on assumed traffic indices. We will also provide recommendations for permeable and precast pavers. Temporary Excavations: Utilizing the data collected during our exploration, we will present temporary excavation guidelines (construction site safety is the responsibility of the contractor). POST -REPORT SUBMITTAL SERVICES A/E Team Coordination and Review: We will provide geotechnical support for the design team during preparation of the project drawings and specifications. We will review the project drawings and specifications for compliance with our geotechnical recommendations. General Contractor Bidding Phase Services: Respond to bid questions including requests for information (RFIs) as they relate to geotechnical items; and attend project meetings and participate in conference calls with the design team. SCHEDULE Upon receipt of a written notice -to -proceed Leighton is prepared to immediately commence project planning and scheduling. California law requires that Underground Service Alert (USA) be provided at least two working days advanced notice to locate registered public utilities at the project site before exploration can begin. Depending on potential site access constraints, weather and exploration equipment availability, field exploration may begin five to ten working days after receipt of notice to proceed. Depending on project specific scope details, our field exploration can be completed in one or more days. In general, geotechnical laboratory testing will require approximately two weeks to complete after the conclusion of field exploration. Geotechnical analyses and report preparation will then require an additional 2 weeks after completion of lab testing. We anticipate we can provide our geotechnical report within approximately 4 weeks after field exploration. We can provide preliminary results upon request in a technical memorandum as site -specific information becomes available.