01.29.19 Work Session - Laserfiche WebLink

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City Council Meeting Minutes January 29, 2019 Mr. Parker reviewed the City's drainage requirements and explained that runoff from increased impervious cover must be equal to or less than the rate of runoff prior to development for the 2, 10, 25, and 100 -year storms, and that there can be no increase in water surface elevations offsite. He provided that upstream flow, based on ultimate buildout conditions, must be conveyed through site, and that drainage infrastructure must be designed for the 25 -year storm with the 100 -year contained within a drainage easement or Right-of-way (ROW). He explained that a potential discussion with the developer would be to coordinate with the Airport stormwater flows to assist with management of regional flows. Staff will get the Council a map of the Riverine Project to show how it would impact this project. Mr. Parker reminded the Council that during the platting process, whether the project is in the City Limits or not, will require water quality standards. Mr. Parker reviewed the City's water quality standards and explained that stormwater quality treatment is not required as the site is outside of the Recharge Zone, Transition Zone, San Marcos River Protection Zone, and San Marcos River Corridor. He provided that water quality and buffer zones are located within the development. Laurie Moyer, Director of Engineering/CIP, provided that the developer has committed to 70% total suspended solids removal and compliance with water volume reduction for stream erosion control. Ms. Parker provided that the developer has discussed improvements to Hwy 80 with TxDOT and anticipates the need for center and right turn lanes in the vicinity, which should improve safety in the area. He stated that a traffic impact analysis will be required and will determine which improvements are necessary, and that the construction of FM 110 is scheduled to begin in 2019 and will help alleviate traffic in the area. He provided that this aligns with Multimodal initiatives. Mr. Parker provided the Loop 110 and rail construction timelines. Discussion was held regarding traffic impacts in this area due to the project. Ms. Moyer provided that Staff is looking at the safety issues and concerns that have been expressed by the residents of Blanco River Village with TxDOT to see if it warrants a traffic signal at the entrance to the subdivision. They are looking into this concern as a separate issue. Mr. Parker discussed the regional solution of the wastewater lift station that is currently in our CIP. Mr. Parker explained that the developer has agreed to take the lead on it and pay his pro -rata share. This lift station will eventually City of San Marcos Page 4