Report to Carson Reclamation Authority
Tuesday, July 05, 2022
Consent
SUBJECT:
Title
CONSIDER AMENDMENT NO. 1 TO AN AGREEMENT FOR CONTRACT SERVICES BETWEEN THE CARSON RECLAMATION AUTHORITY AND LEIGHTON CONSULTING, INC. FOR GEOTECHNICAL SERVICES ON THE FORMER CAL-COMPACT LANDFILL, INCLUDING ADDING "TOP OF TRASH" INVESTIGATION, IN THE AMOUNT OF $490,064.00 (CARSON RECLAMATION AUTHORITY)
Body
I. SUMMARY
The original contract with geotechnical consultant Leighton Consulting, Inc., ("Leighton") entered into on November 21, 2021 (Exhibit 1) allowed them to perform document review, subsurface explorations, laboratory testing, and engineering analyses to develop geotechnical design recommendations for the proposed Carson Goose Owner, LLC (CGO) project on Cells 3, 4, and 5. This work is largely described as the "bottom of trash" investigation. Because the project site is a former landfill, they prepared a project-specific work plan and updated their health and safety plan (WP/HASP) for the site for submittal to DTSC and received approval prior to commencing their exploration program.
This bottom of trash work (the characterization of the soil under the trash layer) is necessary for the design of the subsurface and foundation systems, particularly the structural piles. The CRA was requested to provide the geotechnical information for Cells 3, 4, and 5 by the site developer. Because this work solely benefits the developer, they are obligated to cover the cost through the current Reimbursement Agreement.
More recently, a Top of Trash Study Workplan was prepared by EKI, the environmental design firm engaged by CGO, and approved by DTSC. EKI has requested that Leighton conducted the field investigation outlined in the Workplan. Leighton's scope of work is limited to providing the necessary equipment, labor, and field oversight to complete the soil cover investigation. EKI will be responsible for locating explorations, official field documentation, and reporting.
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