Agenda - Council - 09/26/2023 - Laserfiche WebLink

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Table 8. Wells b. Describe effects from project activities on water resources and measures to minimize or mitigate the effects below. i. Wastewater — For each of the following, describe the sources, quantities, and composition of all sanitary, municipal/domestic, and industrial wastewaters projected or treated at the site. 1) If the wastewater discharge is to a publicly owned treatment facility, identify any pretreatment measures and the ability of the facility to handle the added water and waste loadings, including any effects on, or required expansion of, municipal wastewater infrastructure. The daily wastewater flow for the proposed development was calculated by utilizing the Metropolitan Council Sewer Availability Charge (SAC) Criteria Calculator to determine the equivalent number of SAC units for the proposed residential units on site. The proposed 498 units, along with the existing church, yielded a total of 536 SAC units for the proposed development. A flow of 274 gallons per day (GPD) per SAC unit (per Metropolitan Council) was used to get an estimated daily sewage flow of 146,864 GPD for the proposed development. The property will be served by the publicly owned Metropolitan Council Metropolitan Wastewater Treatment Plan in Saint Paul. The plant currently treats an average of 172 million GPD, with a total capacity up to 251 million GPD. Based on the Twin Cities Metropolitan Council Sewer Availability Charge Guidelines, the estimated wastewater from the proposed development is anticipated to consist primarily of normal commercial sewage resulting from the proposed residential and institutional areas on site. The proposed site is expected to generate approximately 146,864 GPD (0.146 million GPD). The Metropolitan Council's Metropolitan Wastewater Treatment Plan has the capacity to treat the volume and composition of wastewater generated by the proposed project without pretreatment or other plan facility improvements. It is anticipated that the 8" stubs on the property will be able to handle the added water and waste loadings, although additional expansion or reconfiguration of existing sanitary sewers may be required. 2) If the wastewater discharge is to a subsurface sewage treatment system (SSTS), describe the system used, the design flow, and suitability of site conditions for such a system. If septic systems are part of the project, describe the availability of septage disposal options within the region to Haviland Fields EAW 13 September 2023