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Mr. Himanshu H. Mehta, P.E. 2 June 2023 Page 7 Geosynte& consultants Phase 7 — Prepare RAPM Addendum No. 4: Under this task, supported by results from pre-RAPM Addendum No. 4 injection sampling activities, Geosyntec will prepare RAPM Addendum No. 4 to propose a focused injection of enhanced in situ bioremediation amendments (e.g., electron donor, dechlorinating microbial cultures, and/or buffering agent) to address CVOC impacts in the vicinity of the former source area (near GR-MW30B) and northwest of the former source area (near GR-MW26B). Geosyntec will finalize the bioremediation design based upon the results of the investigation to optimize implementation by providing both an economical and practical approach to meeting the long- term goals of the Site. The draft bioremediation design package will be provided to IRC SWDD electronically via email for review and comment prior to submittal to FDEP. The draft RAPM Addendum No. 4 will include, at a minimum, a proposed injection location figure, dosing calculations specifying the amount of bioremediation amendments required, and summary text outlining the design approach. Effort is included for one round of revisions based on client comments. Within 2 weeks of receiving comments from IRC SWDD on the draft RAPM Addendum No. 4, Geosyntec will submit the final design package to FDEP. (Note: Budget for the implementation of the bioremediation injection activities that will be proposed in the RAPM has not been included and will be presented under a separate Proposal following Agency approval of the RAPM Add. No. 4). ASSUMPTIONS The following assumptions were made in developing this fee proposal: • IDW for off-site disposal (decontamination water and soil cuttings) will be characterized as non -hazardous. • If needed, changes to the proposed scope of work, budget or schedule will be agreed upon in writing in advance of the work being performed. • Adverse weather conditions that require operations to be halted may affect the proposed schedule and budget. Adverse weather conditions may include, but are not limited to, a tornado watch/warning, lightning in the area, and a hurricane or threat of a hurricane. • If a stop work order is issued for reasons outside of Geosyntec's control, the budgeted cost and schedule shall be subject to revision due to changed circumstances. TIME SCHEDULE The semi-annual groundwater sampling events will be tentatively conducted in June and December 2023 as described herein. Reports will be submitted to FDEP to meet required deadlines. RAPM Addendum No. 4 monitoring well sampling activities will be conducted concurrently with the Summer 2023 semi-annual groundwater sampling event. DPT drilling activities will be scheduled within 90 days of approval, given driller availability. The RAPM Addendum No. 4 will be submitted to FDEP within 90 days of receipt of laboratory analytical results. FR0766\XR23010.docx engineers I scientists I innovators