4-134 1964 Subsidence Study.pdf

This is a technical study document related to a landfill monitoring well replacement project in California. The file contains a subsidence study from 1964 that provides historical geological and hydrogeological context for the project area. The study documents baseline subsidence conditions and subsurface characteristics that inform the current monitoring well replacement work. The project scope requires the abandonment of one existing groundwater well and installation of two new groundwater monitoring wells at designated locations. Final well depths and screened intervals will be determined in the field by the Project Hydrogeologist based on observed subsurface conditions and in accordance with applicable State and local regulations and approved work plans. The contractor is responsible for providing all necessary work plans, permits, and inspections as specified in the contract requirements.

The 1964 subsidence study serves as critical reference material for understanding historical subsurface conditions and potential geological changes at the landfill site. This historical data is essential for the contractor to properly design and implement the monitoring well replacement strategy, ensuring that new wells are positioned and constructed to effectively monitor groundwater conditions and any ongoing subsidence issues. The study supports compliance with State and local regulatory requirements governing groundwater monitoring and well construction standards applicable to California landfill operations.