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Page 43 of 59 <br /> <br />City of Everett Merrill & Ring Bridge Replacement <br />x The site lies within one (1) distinct TDA. Therefore, only one (1) downstream analysis is <br />assumed. <br />x Access onto private property is anticipated to be needed. It is assumed the City of Everett <br />will provide rights-of-entry as needed. <br /> <br />Deliverables: <br />x Off-site analysis write-up: To be included in the drainage report <br /> <br />12.1.3 Site Assessment and Mapping <br />Perteet will prepare site assessment maps showing existing drainage features within the project <br />site. Mapping will be assembled based upon existing topographic maps and project survey <br />information. Offsite information will be acquired from GIS mapping, City records, and City <br />maps. The assessment maps, produced by Perteet, will show existing contours, existing drainage <br />elements, and any critical areas such as wetlands and streams. This information will be used for <br />appropriate documentation in the Drainage Report. These site assessment maps and exhibits will <br />include: <br />x Land use types and areas. <br />x Topographic plans within the project site, including enclosed drainage. <br />x Topographic mapping outside of road project right-of-way but within project area of <br />interest (electronic GIS). <br />x Wetlands, streams and other critical areas (if applicable). <br />x Soil types, depth, and slope – Natural Resources Conservation Service (NRCS). <br />x Soil subsurface information, as available. <br /> <br />Deliverables: <br />x Site Assessment Maps in 11” x 17” sheet size with a scale of 1:50 (to be included in the <br />Drainage Report) <br /> <br />12.1.4 Change in Land Use Area Map <br />Perteet will prepare maps identifying existing and proposed impervious areas. This is used for <br />threshold determination in accordance with the drainage standards, and to verify mitigation <br />needs for flow control and stormwater quality treatment are being met. TDA boundaries, based <br />on high points and conveyance system configuration, will be identified on these maps. Perteet <br />will also prepare a summary of area tables for pre-project and post-project conditions. <br /> <br />Deliverables: <br />x One (1) electronic PDF copy of the Change in Land Use Maps and corresponding table of <br />change in land use areas. To be included in the Drainage Report. These maps will <br />include: <br />o Existing Impervious Area Map (one [1] sheet) <br />o Proposed Impervious Area Map (one [1] sheet) <br />o Tables identifying the different types of impervious surfaces <br /> <br />12.1.5 Stormwater Flow Control and Water Quality Treatment Calculations