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Mr. Himanshu H. Mehta, P.E. 19 November 2019 Page 8 • Annual LFG Sulfur Content Test: Geosyntec will collect three samples of LFG annually to determine the sulfur content in accordance with ASTM Method D5504-12 or D7493. The samples will be tested by a certified air testing laboratory. The laboratory test results will be used to calculate sulfur emissions and a report prepared for submittal to FDEP. The LFG sulfur content test and reporting will be completed no later than 31 December 2020. Phase 5 — Technical and Miscellaneous Permit Compliance Support and Reporting Under this phase, Geosyntec will provide SWDD with technical support and miscellaneous permit compliance support services related to the Class I landfill and C&D disposal facility on an as needed basis. These services may include: • Reporting required by the Multi -Sector Generic Permit for stormwater discharge; • Quarterly monitoring and reporting of the LFG monitoring wells located at the perimeter of the site and also in enclosed structures; • Miscellaneous permit and compliance support services; • Assistance with preparing annual budgets for SWDD; • Preparing agenda items for and attending SWDD Board of County Commissioners meetings upon request; • Sampling and reporting for additional monitoring wells and surface water for the C&D debris disposal facility depending on the results of the semi-annual and quarterly sampling and analytical testing; and • Other services as needed. As part of these services, Geosyntec proposes to assist SWDD with following for the evaluation and resolution with issues pertaining to the exceedances in select analytes of the C&D debris disposal facility monitoring wells and surface sample sites: • Monitoring Well Construction Review — Review monitoring well construction details and historical depth to water measurements for all wells in the monitoring network to evaluate if screen intervals are representative of aquifer conditions. This recommendation is based on the redox sensitive nature of analytes, particularly metals, in groundwater resulting in variable groundwater concentrations due to water level fluctuations. • Alternative Groundwater Cleanup Target Level — In 2012, FDEP published a memorandum regarding ammonia in groundwater at solid waste management facilities. Based on this memorandum, Geosyntec suggests exploring the alternative GCTL for NCP2019_2283/JL19022 2020 Compliance Monitoring Proposal