Agenda - Planning Commission - 05/01/2003

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I I I I I I ! I I I I I I i I site. Excess volumes of surface water runoff will be pre-treated before allowed to drain from the Center or its nearby/adjacent runoff treatment system. Because the Ramsey Town Center will not have any heavy industrial uses, it is not expected that the provisions of the Phase II NPDES program dealing with Industrial Activity will apply. However, if development conditions change before the site is finally built-out, and heavier industry is allowed on the site, these provisions could apply. Although there is no intent for heavy industry to occur in the Center, the City will monitor the permit requirements relative to land uses under which the permit conditions apply, and implement a control program if ever needed. Relationship to Mississippi River TMDL One water quality element of note in the mitigation plan is tlie need to reduce the negative impact of a discharge to an ~'impaired water" under tlxe Total Maximum Daily Load (TMDL) program...The Mississippi River through the City ofR. amsey has been listed on the MPCA recommended "303d" list as impaired relative to fecal coliform, PCB and mercury. The PCB and mercury programs are regional in scale and are the subject of regional MPCA and USEPA remediation programs. The discharge of storm water high in fecal coliform, however, is something that the City will need to address. The implementation of nonpoint source pollution control BMPs does not necessarily assure the reduction of fecal coliform. The process for setting a TMDL includes the initiation of a formal study that results in recommendations for control of the pollutant causing the impairment. MPCA has not yet begun this study for the impaired Mississippi River reach; however, once this study begins (currently scheduled for 2004-2006), the City will cooperate to the best of its ability with the MPCA to reduce the input of fecal coliform to the River. Item 18 Mitigation element. Both the wastewater flows and the projected loadings from the RTC development can be effectively transported and treated by the MCES system. In addition, future development and resulting flows are within the range of those estimated in the City's 2001 Comprehensive Plan, as amended in 2002. Therefore, it does not appear that there is any cause for specific remediation actions. A 30-inch sewer main is recommended to serve the RTC. As noted earlier, it will be necessary for the City to update its Comprehensive Sewer Plan, following discussion with MCES on increased allocated capacity. In addition, it will be important to measure and test the wastewater flows from the new development on a periodic basis. This will allow the City and MCES officials to monitor the characteristics of the wastewater generated by the development over time and to address any future unforeseen changes. Item 19 Mitigation Element. The high permeability of the soils at the Town Center are ideal for the implementation of infiltration practices that will manage stormwater runoff,. provide flood control and recharge the water table aquifer. However, the high D-15- 47