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

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within the current edition of the 10 -State "Standards for Wastewater Facilities". The flow variation fouiiula is based on population. As the population increases, the flow variation factor decreases. This comprehensive plan is based on current land use planning. The plan follows the format of the 1991 plan by breaking down, in general, each 40 -acre parcel in the City into developable and non -developable acres. To the extent possible the estimated number of units on undeveloped property comes directly from the 1991 plan. However, City staff has reviewed all of the development density assumptions used in this report to verify that they are consistent with current land use planning. Residential flow is calculated based on 3.0 people per unit and 75 gallons per capita per day. This equates to 225 gallons per unit. Commercial and industrial flows are calculated based on 20 people per acre, which equates to 1,500 gallons per acre and special flows are taken directly from the 1991 study. This report recommends that sewer sizing within the City of Ramsey continue to be based on ultimate flow projections. At this time, it is anticipated that sewer treatment for the area north of Trott Brook would be treated at a facility located within the North Trott Brook Service Area. As with the 1991 sewer plan, this study verifies that the two existing interceptor sewers that serve the City of Ramsey have the capacity to serve the City's projected ultimate flow south of Trott Brook based on current land use planning. C. PAST PLANNING Land use assumptions originally made in 1974 and 1978 were used to size the existing sanitary sewer facilities that serve the City of Ramsey. One of the key assumptions made at that time was that undeveloped property would ultimately be developed as residential property with a density of 2.5 dwelling units per acre. The other key assumption was a population estimate of 3.67 people per existing residential unit and a population projection of 3.2 people per unit for future residential growth. City of Ramsey Page 2-2 Comprehensive Sanitary Sewer Plan - 2004 Prepared by Bolton & Menk, Inc.