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Task 3.1.2:SCM Selection Framework <br /> The SCM selection process, which takes place during the planning and site development phase of a design <br /> project, must consider the specific conditions, constraints, and requirements of each site (e.g., geotechnical <br /> issues, infiltration capacity, pollutants of concern, hydromodification needs). Tetra Tech will develop a <br /> series of tables that includes SCM type with adequate information to assist in the selection of the proper <br /> SCMs to be incorporated into the site plan in a way that is consistent with existing regulations. A matrix will <br /> be developed to provide comparison of SCM technical specifications and constraints, short and long term <br /> operation and maintenance considerations, as well as qualitative SCM costs (construction and inspection <br /> and maintenance) for the three practices. In addition, a decision framework (e.g., decision tree, selection <br /> matrix) will be prepared which will consider site constraints such as infiltration capabilities, groundwater <br /> conditions, slope, and maximum recommended drainage area which may limit implementation of some <br /> SCMs. The decision framework will provide a step-by-step process for identifying the suite of SCMs most <br /> appropriate for a site. We will also include guidance for city staff and designers on how to incorporate <br /> additional types of SCMs (including proprietary devices) into their site. This will allow designers to suggest <br /> SCMs that can be incorporated into the LID technical appendix in future updates. <br /> Task 3.1.3:SCM Design Guidance <br /> Tetra Tech will prepare design sections for the three LID SCMs to be included as part of the LID technical <br /> appendix. The design section documents will include the technical design material, operations and <br /> maintenance requirements. Information contained within the design sections will include: <br /> • Brief description of the SCM and its intended operation. <br /> • Highlight incentives and multiple benefits of LID to promote implementation, as well as provide <br /> placeholders for future efforts for potential quantification of these benefits based on Triple <br /> Bottom Line procedures. <br /> • Narrative technical design guidance and specifications: This will include text to be used in <br /> development of specifications for SCM-specific elements such as amended soil, aggregate, <br /> underdrains, recommended vegetation, etc. Sections will not include standard specifications <br /> such as, but not limited to, concrete mix design, pipe design, utility relocation, etc. <br /> • Engineering design templates: Detailed schematics and drawings will be provided for each <br /> SCM in a format that can be integrated readily into engineering drawings, site plans and <br /> details. The design templates will include critical components, design considerations, and <br /> example site configurations for each SCM while allowing for flexibility where various options <br /> exist(e.g. various curb cut options). <br /> • Operations and maintenance guidelines and checklist, including frequency of suggested <br /> maintenance, triggers for maintenance checks, and recommended maintenance actions. <br /> Deliverables <br /> • Draft LID technical appendix for City review <br /> 14 <br />