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Special City Council Meeting Wednesday, December 16, 2015 Page 5 Public Works Director Marc Culver displayed a map of the Twin Lakes Redevel- opment Area storm sewer infrastructure as it currently exists, along with the area of the proposed development project, and location of Langton Lake. Mr. Culver stated that staff's intent for this specific language was to clarify that there would be no additional outlets for stormwater drainage, and that any infrastructure de- veloped on the site would connect to existing stormwater structures on Mt. Ridge Road, and keep the intent for constructed stonnwater infrastructure. Mr. Culver further clarified that language stipulated that any existing grading or any re- grading would be required to be modified or constructed to drain away from Langton Lake, and that the applicant ineet a higher standard, insuring meeting volumes for a 2" rainfall event. At the request of Mayor Roe, Mr. Culver confirmed that the existing stormwater under Mt. Ridge Road did not drain into Langton Lake, but drained into a pond further north. At the request of Councilmember Laliberte, Mr. Culver confirmed that he had been party to crafting this expanded language for Condition E. Thomas W. LaSalle, President and CEO of LaSalle Group Limited As owner representative for the applicant, Mr. LaSalle expressed some confusion with Mr. Culver's explanation and rationale for expanded Condition E, noting this was their initial look at it. Mayor Roe provided clarification by noting that while the current city standard for treating stormwater volume is not as high as a 2" rain event, the applicant would be asked to increase their standard to address a 2" rain event, for the pur- pose of dealing with a potentially greater volume. Mr. Culver concurred, noting that the current standard was for 1.1" of treatment and volume control, but the 2" condition would address rate control measures through the applicant's creation of a pond or ditch to hold the runoff for such a larger rain event. Mr. Culver agreed with Mayor Roe's further clarification that this condition was intended to apply to any portion of the site not able to be re- graded. Mr. LaSalle noted that the applicant didn't intend to touch the eastern boundary of the property; questioning what impact this condition then had for them. Mr. Culver advised that, as the applicant designed their site and stormwater infra- structure for the site, they may want to put in extra pipes to access the existing stormwater system.