Agenda - Parks and Recreation Commission - 04/10/2014

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City of Ramsey 2030 Comprehensive Plan Update Chapter 8: Waste Water 8. WASTEWATER ELEMENT Section 1: Sanitary Sewer Component: In 2004 the City of Ramsey completed a Comprehensive Sanitary Sewer Study which was prepared by consulting engineers Bolton & Menk, Inc. and has been reviewed and approved by the Metropolitan Council. This report identified the ultimate sanitary sewer flows for the City. The City of Ramsey is considered by Metropolitan Council to be a "Developing Community" and as such is presently allowed to extend sanitary sewer service anywhere within MWCC Sanitary Sewer District 3 boundary (south of Trott Brook). The current extent of the sewered area is now adjacent to Trott Brook and revised land use plans require its extension to the remaining portion of the City. The City's current wastewater flow allocation is 3.8 million gallons per day (mgd). The Inflow and Infiltration (I/I) goal established for the City of Ramsey varies based on annual average flow for each connection point to the Metropolitan Disposal System (MDS). The Metropolitan Council's metering program shows that the City's 2004 annual average flow at meter M302 was 0.46 mgd. The current UI goal for the City of Ramsey at this point is an allowable peak hourly flow of 1.61 mg. The 2004 annual flow at meter M304 was 0.17 mgd. The current I/I goal for Ramsey at this point is an allowable peak hourly flow of 0.66 mgd. The City continues to monitor the integrity of its Sanitary Sewer infrastructure. One third of the Sanitary Sewer system is cleaned each year while one tenth is televised. The City invested in a new Sewer Vac truck in 2009. The City does not have an ordinance that prohibits the connection of sump pump, rain leaders, or passive drain tile from the sanitary sewer system. The City of Ramsey has adopted the Minnesota State Building Code, which states that drainage systems shall discharge into an approved sewer system or to daylight (§R405.2.3) and storm sewer systems shall not drain into sewers intended for sanitary sewage only (§4715.2700). The City of Ramsey interprets that these systems must drain to daylight only unless storm sewer is available on-site. The City of Ramsey will explore the need for such ordinances if it is determined the City is not meeting the established I/I goal. The Comprehensive Sanitary Sewer Study completed by Bolton & Menk Inc. is incorporated to this Plan as Appendix B, Comprehensive Sanitary Sewer Plan. Household, population, and employment forecasts can be found on Table 4-2 on page 4-3 and in Chapter 5 on pages 5-34 through 5-39. Revised sanitary sewer flow projections based on the revised Future Land Use Map are included as Exhibit 8:1 of this Chapter. The flow assumptions for calculating sanitary sewer flow are as follows: Description Factor Gallons per Person per Day 75.0 Flow Variation Factor 2.5 to 4.0 People per Unit 3.0 Flow per unit 225 Employees per Acre 20 Commercial/Industrial Flow per Acre 1,500 According to the Metropolitan Council, regional capacity for North Trott Brook Sewer District can be provided through the existing Regional Disposal System by system capacity improvements. Therefore, a future Regional waste water treatment plant (WWTP) is not being planned at this time. In addition, the Metropolitan Council has stated that the sewer flow projections in Exhibit 8:1 are approximately 40% higher than those projected by the Metropolitan Council. Page 8-1