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TETRATECH <br />Mr. Richard Meckes. <br />Indian River County Department of Utility Services <br />March 7, 2022 <br />Page 4 <br />the aliquots will be composited to form a single mass for analysis. Biosolids sampling is <br />proposed as follows: <br />• Four grab samples collected within an 8 -hour period and composited. <br />• Sampling period is proposed over 2 consecutive days. <br />Task 5 — Calculate Local Limits <br />Tetra Tech will calculate the Local Limits for the WWTF. At a minimum, local limits will be <br />evaluated for the following pollutants: <br />• Ammonia -N <br />• Arsenic <br />• BOD <br />• Cadmium <br />• Chromium <br />• Copper <br />• Cyanide <br />• Lead <br />• Mercury <br />• Nickel <br />• Selenium <br />• Silver <br />• TP <br />• TSS <br />• Zinc <br />• Fats, Oils & Grease <br />Tetra Tech may also consider additional pollutants as requested by IRCDUS based on local <br />concerns and the results of the priority pollutant scan. <br />Tetra Tech will perform a technical evaluation of the local limits using the Local Limit Information <br />and Development System (LLIDS 2020) program from the FDEP and the current version of the US <br />EPA Guidance Manual on the Development Implementation of Local Limitations under the <br />Pretreatment Program (Local Limits Development Guidance, July 2004). The local limits <br />calculations will be performed based on current flows and the design flow of the WWTF. <br />Tetra Tech will assess current conditions to determine if existing Maximum Allowable Headworks <br />Limits (MAHLs) should be recalculated or reallocated, or if additional local limits should be <br />developed for the program. Tetra Tech will evaluate existing data and will then calculate the <br />MAHLs for currently regulated POCs and determine MAHLs for each new POC. Based on the <br />MAHLs for POCs at the WWTF, Tetra Tech will develop local limits using the uniform allocation <br />