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City of Gem Lake Comprehensive Plan GEMLK 140643 Page 59 7 Sanitary Sewer System Plan 7.1 Introduction The City of Gem Lake currently owns and maintains a sanitary sewer network that currently serves all of the businesses at the Hoffman’s Corners area, a segment of the residential area along Scheuneman Road north of U.S. Highway 61 and the Hillary Farm neighborhood. The City of Vadnais Heights supplies sanitary sewer services to the Tousley Ford property, the Montessori School at the corner of County Road E and Labore Road, and several residences that neighbor the school. 7.1.1 Existing Sanitary Sewer System The current system consists of approximately 13,400 Lineal Feet (LF) of sanitary sewer pipe ranging from 8” to 10” in diameter of both vitrified clay pipe (VCP) and polyvinylchloride pipe (PVC). There are approximately 65 manholes in the system. There are no lift stations or force mains within the existing system. Figure 7-1 shows the City’s current sewer system and sewer districts. Currently the system discharges into the Metropolitan Council Environmental Services (MCES) System in six locations including the two properties that discharge directly to MCES interceptor 7122 on Scheuneman Road as shown in Figure 7-4. The system discharges into a combination of both the VH-423/VH-423A Interceptors and the 7122 Interceptor. Currently MCES does not have a metering station near the city limits of Gem Lake. There are no existing treatment facilities, municipally or privately owned, in the City. The existing condition of the City’s sewer system was evaluated in the fall of 2006 / spring of 2007. A sanitary sewer system plan was developed in May of 2007 by SEH for the City, developed based on the field inspections of manholes and a closed circuit televised (CCTV) inspection of the pipes. This plan is an update to the sanitary sewer system plan developed in May of 2007. 7.2 Projected Flows The projected population, household and employment numbers for the City of Gem Lake, as published by the MCES Thrive MSP 2040 forecasts are shown in Table 7-1 below. These numbers are to be used in future planning and development for the City, to assist MCES with metro area planning. MCES also has provided sewered and unsewered projections, summarized in Table 7-2. Table 7-1 – MCES Thrive MSP 2040 Forecasts 2020 2030 2040 Population 480 500 530 Households 200 230 250 Employment 580 610 640 Source: Gem Lake Community Page, produced by MCES MCES has produced the following (Table 7-2) projected flows for the City of Gem Lake. Because Gem Lake is unmetered, the project flows are determined using a combination of temporary flow data and SAC connection counts.