2024-113 - Laserfiche WebLink

Home Browse Search

Mr. Himanshu H. Mehta, P.E. 22 April 2024 Page 2 PROJECT BACKGROUND Geosyntec consultants As part of the long-term monitoring activities for the identified CVOC plume associated with the South Gifford Road Landfill, a network of monitoring wells require sampling on an annual or semi-annual basis to: (i) confirm that the CVOC plume is not migrating by monitoring the lateral and vertical extent; (ii) evaluate the impact of source and dissolved plume bioremediation to assess CVOC plume centerline concentrations over time; and (iii) assess the impact of biological and physical natural attenuation processes on CVOC plume degradation. Geosyntec conducted previous bioremediation injection events in 2008, 2009, 2012, and 2017 to remediate recalcitrant CVOC groundwater impacts in the downgradient biobarriers and in the former source area. Groundwater monitoring results in 2023 suggested that the plume monitoring well network could be reduced to account for plume shrinkage since the previous 2017 bioremediation injection. In the 2023 Annual GMR, Geosyntec recommended to remove 16 monitoring wells from the 2024 sampling and analysis plan, reducing the number of monitoring wells sampled from 42 to 26, a 38% decrease. Geosyntec also recommended to change the reporting frequency from semi-annual to annual. FDEP approved these recommendations to reduce sampling and reporting frequency in an approval letter dated 18 March 2024. PROPOSED SCOPE OF WORK For the purpose of budgeting, the scope of work has been divided into the following phases: • Phase 1 — Project Management, • Phase 2 — Meetings/Regulatory Interaction, • Phase 3 — Annual Pollution Remediation Liabilities Evaluation, • Phase 4 — Semi -Annual Sampling Activities, and • Phase 5 — Data Evaluation and Annual Reporting. The remainder of this section presents a general description of the activities to be performed in each phase. Phase 1 — Proiect Management: Under this phase, Geosyntec will perform project planning and management responsibilities, such as correspondence with IRC SWDD and FDEP, invoice review, project coordination, and project administration. The budget includes two hours per month for the project manager (24 hours total) and one hour per month (12 hours total) for the project administrator. FR0766\XR24015.docx engineers ( scientists I innovators