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TETRATECH Mr. Richard Meckes. Indian River County Department of Utility Services March 7, 2022 Page 5 method or industrial contribution method and assist the IRCDUS in adopting the revised local limits. If the industrial contribution method is used, additional information on the pollutants discharged by each significant industrial user (SIU) will need to be provided by the IRCDUS. Developing Local Limits will involve the calculation of the maximum allowable headworks loadings based on the following criteria: • NPDES Permit Limits, • Pass-through based on reuse for irrigation/sandy soils, • Treatment inhibition for nitrification and activated biosolids, and • Biosolids quality for land application. These criteria will be applied in accordance with current IPP guidelines and requirements of the FDEP and the USEPA. For the compatible pollutants (BOD, TSS, Total Phosphorous and Ammonia - N), a basis of design criteria will be considered in addition to the pass-through criteria. Average background loadings and a safety factor will be deducted from the calculated headworks loadings prior to being converted into concentration -based limits via the selected allocation method. Task 6 — Recommendation on Feasibility of Local Limits Tetra Tech will compare the calculated local limits for the WWTF to select the lower value as the value calculated for the evaluation. These values will then be compared to the existing local limit and Tetra Tech will present the results to the IRCDUS for selection of the final local limit value. Task 7 — Report The efforts of Tasks 1 through 6 above will be summarized in a Local Limits Technical Evaluation Report. A Draft Report will be prepared and submitted to the IRCDUS for review and comment. Upon receipt of comments, the Final Report will be prepared and submitted electronically to FDEP. Tetra Tech will deliver five (5) paper copies and an electronic copy in PDF format of the Final Report to the IRCDUS. Task 8 — IPP Evaluation Tetra Tech will retain the services of Brown and Caldwell (BC) to conduct an evaluation of the County's existing IPP. This will consist of both offsite/virtual and onsite tasks that will assess compliance with federal, state, and local pretreatment regulations. The offsite support will include the assessment of the following: • NPDES Permit • FDEP-issued Pretreatment Program approval documents (if applicable) • Sewer Use Ordinance/Pretreatment Ordinance • Enforcement Response Plan • Implementation Manual (if applicable) • Industrial User Permits