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APPENDIX A <br /> SCOPE OF WORK <br /> The County will provide the following services: <br /> • Orthorectify 1991 aerial photos already in digital form, of the City of Everett area <br /> above the Marshland floodplain. <br /> • Perform tonal balance of orthorectified 1991 aerial photos <br /> • Perform impervious analysis for 1991 aerial photos <br /> • Perform change analysis with 1991 and 2015 impervious data <br /> • Perform change analysis with 2007 and 2015 impervious data from existing imagery <br /> (impervious data already derived) <br /> • Update tributary area boundary to account for 2006 WSDOT I-5 drainage system <br /> changes based on GIS files provided in an email from Erik Emmerson on 3/1/18, that <br /> includes detention facilities for Marshland, Marshland Tributaries, and Wood Creek <br /> and 7 sub-basins for the Lowell basin in Everett <br /> • Document findings, including the following, in a memo report: <br /> o Introduction <br /> o Data sources <br /> o Methodology <br /> o Results <br /> o Conclusions <br /> INTERGOVERNMENTAL SERVCIES AGREEMENT BETWEEN pg. 6 <br /> SNOHOMISH COUNTY AND CITY OF EVERETT FOR GIS ANALYSIS <br /> OF EVERETT AREA UPLAND OF MARSHLAND DRAINAGE BASIN <br />