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Assumptions <br />• The development of initial design concepts, screening of alternatives and sizing <br />evaluations will include assessment of both small -capacity stand-alone systems <br />(approximately 1 MGD) intended to support limited WPCP effluent flow rates and <br />larger -scale facilities that could support treatment of the entire WPCP effluent flow <br />stream (approximately 5 MGD). Sub -tasks 3-6 in this proposal that support final <br />engineering design and preparation of construction documents are only applicable if the <br />reduced -capacity system option is selected. <br />• If the reduced -capacity nitrification system is selected, the proposed facility will be <br />located in the area adjacent to the WPCP drying beds immediately upstream of the 4.3 - <br />acre treatment wetland basin. <br />• If a larger -scale nitrificationfacility for treating the full WPCP effluent flow stream is <br />selected requiring integration with the existing plant infrastructure, the engineering <br />design and construction documents for such a system would be managed by the City <br />WPCP as a separate scope of work and contract. <br />• The incoming WPCP effluent flow stream to the nitrification process facility for the <br />reduced -capacity system option would be subject to temporary shutdowns in order to <br />support system operation and maintenance. <br />• An additional comprehensive geotechnical investigation will not be required to support <br />the design of the stand-alone smaller capacity nitrification process facility; we assume <br />that sufficient existing geotechnical data would be available for the location where the <br />nitrification facility will be constructed. <br />• Because the nitrification system will be constructed adjacent to the wetlands, high- <br />resolution topographic survey data will be collected for this site at the same time as for <br />the treatment wetland pond location. <br />• Integration of system controls with existing plant SCADA and site-specific structural <br />engineering analysis is not included at this time. <br />• Implementation of bench -scale testing and/or pilot studies for potential nitrification <br />processes or technologies is not included. <br />Consulting Services Agreement between City of San Leandro and Last revised September 10, 2019 <br />Terraphase Engineering for Treatment Wetland Design Services Exhibit A — Page 31 of 38 <br />