Resolution No. 4793 - Laserfiche WebLink

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~. ENVIRONMENTN_ REPORT ~itigation Wetland losses would be mitigated following U.S. Army Corps of Engineers (USACE) and Oregon Division o£ State Lands (DSL) grddance, and could involve direct or/ndirect mitigation. D~red rrfitigation includes options such as creating replacement wetlands on site or off site, or preserving e×isting wetlands in the project area. Indirect n'fitigation activities include purchasing "credits" from a wetland mitigation bank (credits are used to preserve the wetland area at which the bank is established), or conserving other wetland areas. 9.4.4 Air Quality, Odor, and Noise Compared to System Alternative 1, System Alternative 5 will have a beneficial/mpact on odor. However, System Alternative 5 will result h~ temporary, negative impacts to alt quality and noise during the construction period. Because of increased treatment capacity, a~r quality and noise impacts ~ander System Alternative 5 are expected to remain essentially unchaxtged during the operational period from the impacts described under System Alternative 1. In general, the proposed changes will improve odor control by capbaring more fugitive odors and using odor-reducing technologies. Construction Period Odor. Odor em/ssions during construction are not anticipated to c~ange. Construction work on expansion to the liquids processes will not affect the odor control processes. Air Quality. Air quality impacts from engine and dust emissions would occur during the construction period. However, these emissions would be temporary and limited to hours when corrstruction activities occtrr. NOise. Noise impacts to nearby residential neighborhoods and comanercial areas from construction traffic, engines, and construction activities would occur during the construction period. However, these impacts would be temporary and limited to hours when construction activities occur. Operational Period Odor. The proposed changes to the WPCF will increase the capacity of the wet weather treatment processes. Changes to wet weather processes will have mirdmal impacts on odor because odor emissions are largely driven by dr), weather conditions such as low flows and high temperatures. However, modifications to the system will improve odor control durkng dry weather conditions. Proposed changes involve increasing the odor control by covering existing and new process areas. Proposed odor control tec2mologies will also improve the efficiency of the odor control system. Using bio-scrubbers will greatly improve odor corttrol because of the increased odor reductior~ and the increase in mixing/dilution capacity of f. he bio-scrubber tower. MWMC_9 0_REV14 DOC 9--13