2018.02.05 CC Packet - Laserfiche WebLink

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General Requirements: • The City shall install and maintain automated water level recording devices (loggers) in each of the wells. These loggers should be set to continuously measure the water elevation in the well on a daily interval from October 15 through May 1 and hourly from May 15t through October 15th. • All water level readings are to be recorded as depth to water from the top of casing and are to be recorded as decimal feet to the nearest 0.1 foot. The data logger and hand readings shall be submitted in electronic format to the Ground Water Level Monitoring Coordinator on a monthly basis or upon request. The minimum logger data set should include a date/time stamp and a water level reading. Specific Well Requirements: 1) The City shall convert test well TW -5 (unique number 731137) into a permanent monitoring well. The land surface and measure point of the well should be surveyed by the City and tied into mean sea level. The well should be field located using global positioning gear with the field locations reported as Zone 15 UTM coordinates WGS 84 datum. 2) Before Well 6 goes into routine production, the City of Hugo should install and maintain an observation well located next to TW 6 (764212) as a well nest. The new observation well should be constructed with water well casing no less than 2 -inch diameter. The well screen placement shall be positioned in the borehole screening depths from 20 to 50 feet below ground level. The ground level and observation well measuring point elevations should be established at the top of casing (TOC) surveyed by a certified surveyor. These points should be located using engineering grade global positioning equipment and be reported as Zone 15 UTM coordinates WGS 84 horizontal datum and NAVD 88 vertical datum. Both nested observations wells (764212 and the new observation well), should be equipped with electronic water level measuring instruments (Le. data loggers) to provide long term water level monitoring information. The data logger should be configured to measure the water levels in the well on an hourly schedule (24 readings per day). Electronic data is to be submitted to the DNR Ground Water Level Monitoring Coordinator (gwlevelcoor.dnr@state.mn.us. Data is due on a monthly basis and upon request. The automated water level readings shall be confirmed with manual level readings collected on a schedule of one per month. All water level readings are to be recorded as depth to water from the top of casing and are to be recorded as decimal feet to the nearest 0.01 foot. The submitted data sets should include electronic and manual data fields of date, time (CST) and water level. Should the new water table level information indicate that pumping at Well 6 significantly impacts water table levels, the City may be required to, a) Reduce pumping rate at Well 6 b) Implement condition #3 below c) Conduct additional investigations. 3) Future water supply investigations intended for acquiring additional groundwater should include exploration, testing and development of alternative water resources.