2017-05-10 CC Packet - Laserfiche WebLink

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Inflow and infiltration is that component of sanitary sewage flow that originates from clear water connections, e.g., sump pumps and foundation drains, stormwater entering manholes and groundwater entering through pipe joints and cracks. It is water that would normally not require any type of treatment. However, once it is co -mingled with sanitary wastewater it cannot be separated, and must be treated with the sanitary wastewater. `;si INFILTRATION The seepage of groundwater into sewer pipes through cracks or joints in the pipes. Q INFLOW Inflow is typically flow from a single point, such as discharge from sump pumps, foundation drains, and rain leaders or storm water entering openings in the sewer access covers. 4D VI GOAL The 1/1 goal is the maximum allowed peak hourly flow limit for each metershed; product of the previous ten-year growth adjusted average daily flow and the standard peaking factor adopted by the Metropolitan Council. Q DEMAND CHARGE A demand charge is the amount that MCES may charge a community for the cost of excess capacity needed in the MDS for those communities that have not met their inflow and infiltration goals(s), if the community has not been implementing an effective 1/1 reduction program in the determination of the Council, or if regulations and/or regulatory permits require MCES action to ensure regulatory compliance. The charge is not a penalty; it will include the cost of wastewater storage facilities and/or other improvements necessary to avoid overloading MCES conveyance and treatment facilities (plus the appropriate service availability charges for use of MCES conveyance and treatment facilities). 54 © EXCESS VI 1/1 that results in wet weather flows that exceed MCES' established 1/1 goal for the metershed, adjusted, where appropriate, for 1/1 into MCES interceptors. 18 EXCESSIVE VI EVENT A wet weather time period when excessive 1/1 occurs within the MDS. EXCEEDANCE PEAK HOUR FLOW (PHF) A meter's peak hour flow that exceeds the metershed's 1/1 goal, adjusted, if applicable, for 1/1 into MCES interceptors. Q EXCEEDANCE RATE The charge per mgd of excessive 1/1. STANDARD PEAKING FACTOR A factor which is multiplied by the average daily flow for a metershed to determine the maximum allowable 1/I. Q MDS Metropolitan Disposal System; wastewater facilities owned and operated by the Metropolitan Council. 10 MGD Million gallons per day METERSHED The area tributary to an MCES flow meter. Some communities have multiple metersheds. Q MWC Municipal Wastewater Charge