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2006 New Problem Areas One of the goals from the City's CSWMP is to provide flood protection for all residents and structures as well as protect the integrity of conveyance channels and stormwater detention areas. Many different policies were identified in the plan to accomplish this. For the purposes of this report, we want to discuss one in particular. Policy 1.9 - Developer responsibility for addressing existing stormwater problems For development and redevelopment projects affecting stonnwater problem areas identified in this CSWMP, the City requires the developer to incorporate such practices as are necessary to resolve a proportionate share of the problem. In the interest of applying this policy to proposed developments, we have identified the following as new problem areas to add to the CSWMP. . 35W corridor Historically the City has observed flooding within the 35W corridor ponds after extreme rain events. These ponds include the basins on both sides of the 35W just to the north of County Road C and around the highway ramps. The primary concern for these subwatersheds is the downstream pipe located within the Mn/DOT right- of- way. This pipe is 2 I inches and increasing the size would push the problems down stream. As a part of the County Road C project, additional storage was constructed to address the runoff from County Road C through ponding and rain gardens. Recommendation: Staff feels that since all the issues surrounding this subwatershed have not been addressed, this subwatershed should be added as a problem area within the CSWMP. . Como Sub 7- Gottfried Pit! HamUue Hoyt Reconstruction Project The City ofRoseville cooperated on a study of down stream flooding and water quality issues with Capitol Region Watershed District, Falcon Heights, the City of St. Paul, and Ramsey County in 2003 for the northwestern watershed area to Como Lake. All of these entities contribute storm water flow to Como Lake. This study identified improvements to be made to mitigate the ongoing storm water issues of this area. The study also assigned cost sharing responsibilities based on contributory flow to the various jurisdictions. Capitol Region Watershed District agreed to contribute funding for a portion of the improvements as well. They were the lead agency on this study as well as the lead agency for the improvements to occur on the Como Golf Course and additional storage at Arlington and Hamline Avenues. Roseville drains 315 acres to this system via Gottfried Pit near Fernwood Street and Larpenteur Avenue. Roseville's share of the construction costs are 1.45% plus 10% engineering. This amounts to $14,343. The amount is limited because the flow from our system is limited by the size of the pumps in our shared pumping station with Ramsey County and Falcon Heights. City of RosevilIe 2006 Storm Water Annual Report Page 6 of 11