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Mr. Himanshu H. Mehta, P.E. 27 April 2021 Page 2 PROJECT BACKGROUND Ge®syntecc' 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 will 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. In consideration of the ongoing natural attenuation processes occurring at the site, the enhancement of these biological processes via the injection of an electron donor was proposed and agreed to in concept by the FDEP in correspondence dated 2 August 2006. In response to FDEP's request and supported by groundwater monitoring results, Geosyntec conducted an injection event in 2017 [Remedial Action Plan Modification Addendum No. 3 (RAPM 3)] to remediate recalcitrant CVOC groundwater impacts in the former source area. Semi-annual performance monitoring associated with bioremediation implementation was conducted from 2017 to 2020 at monitoring wells GR-MW30B and GR-MW37B and six additional monitoring well locations for analysis of CVOCs, dissolved gases, TOC, and/or microbial populations (Dhc and vcrA). In April 2021, FDEP approved to discontinue performance monitoring at GR-MW30B and GR-MW37B, discontinue analysis of dissolved gases, TOC, and microbial populations (Dhc and vcrA) at six additional monitoring well locations, and discontinue CVOC sample collection at five monitoring well locations where CVOCs had not been detected for at least three consecutive sampling events. Semi-annual groundwater monitoring for CVOCs only at 42 monitoring well locations will be conducted in 2021, as well as semi-annual reporting. PROPOSED SCOPE OF WORK The proposed scope of work consists of semi-annual groundwater monitoring and reporting and related activities to be performed on behalf of IRC SWDD at the Former South Gifford Road Landfill. For the purpose of budgeting, the scope of work has been divided into the following tasks: • Task 1 — Project Management; • Task 2 — Meetings/Regulatory Interaction; • Task 3 — Annual Pollution Remediation Liabilities Evaluation; • Task 4 — Semi -Annual Sampling Activities; and • Task 5 — Data Evaluation and Semi -Annual Reporting. The remainder of this section presents a general description of the activities to be performed in each task. FR0766\XR21012 engineers I scientists I innovators