Magnolia Storm Drain Project Geotechnical Services

2026-11-03

The San Bernardino County Flood Control District ( District ) is seeking Proposals from interested and qualified Proposers to provide professional geotechnical services for the Magnolia Storm Drain Project ( F02861 ) ( Project ) in the City of Chino and City of Ontario . The Project is proposing to improve the existing 1 . 4 - mile storm drain that runs from West Philadelphia Street to Cypress Channel along Mountain Avenue , Walnut Avenue , and Cypress Avenue in the City of Chino and City of Ontario . The proposed Project involves construction of a new reinforced concrete box ( RCB ) culvert storm drain to replace the undersized existing storm drain from Mountain Avenue and Philadelphia Street ( Ontario ) to Cypress Channel at Riverside Drive ( Chino ) to convey the 100 - year storm event flows . PROJECT DESCRIPTION Magnolia Storm Drain Project ( F02861 ) is in the City of Chino and City of Ontario , San Bernardino County . 1 . The purpose of the geotechnical investigation is to examine and evaluate soil / subsurface conditions within the area affected by the Magnolia Storm Drain Project . The Proposer shall analyze the data collected during the field exploration and laboratory testing , and prepare a Geotechnical Investigation Report , along with shoring recommendations , containing conclusions and recommendations to assist the District in preparation of contract plans and specifications . The investigation must be developed and supervised by a California Registered Geotechnical Engineer or a Civil Engineer experienced in soil mechanics . The limits of the geotechnical investigation shall be identified above and as shown on Exhibit C , within District right - of - way or road right - of - way . The final boring plan must be submitted to the District for approval prior to the borings . The Proposer will be responsible for obtaining any and all necessary permits , including a well permit from San Bernardino County Environmental Health Services if bores are 25 feet and deeper , a permit from San Bernardino County Flood Control District , and a permit from the City of Chino and City of Ontario . All permit fees will be the responsibility of the Proposer . Specific , detailed considerations with supporting data shall be included for such items as , but not limited to : • Evaluations of the seismic design parameters • Review any existing geotechnical information in the project area • Notify Underground Service Alert ( 811 ) and clear utility locations within project site prior to drilling . • Evaluations of the engineering properties of the on - site soils • Types of materials to be encountered in the proposed excavations • Anticipated excavation and construction problems • Location and extent of required over - excavation • Bearing capacity and settlement characteristics of subgrade materials • Required relative compaction of embankment material • Slope stability analysis for channel side slopes of ( 2H : 1V ) and ( 1 . 5H : 1V ) • Trench Shoring recommendations during construction • Compaction characteristics of the predominant soil • Substances in the native soil deleterious to concrete , steel , or other construction materials • Determination of applicable geotechnical related data , properties , coefficients , etc ., necessary for design of shoring , where applicable • Provide recommendations for Special Provisions using Caltrans Standard Specifications for construction • Factors for volume swell of excavation material , and for volume shrinkage of compacted materials , to be applied in the earthwork quantity calculations 2 . Deliverables / Requirements : I . Geotechnical Report ( signed and stamped by the engineer of record ) II . Geotechnical Investigation boring logs III . Trech Shoring Recommendations during construction

California

2026-03-27