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OIL- <br /> LOVELAND <br /> November 14, 2023 <br /> READY-MIX C��,vED <br /> R <br /> CONCRETE N�V 2� 2023 <br /> Nikie Ganon may + <br /> Regulatory Specialist c�,,oioiadoDi01)o0 ty <br /> PO BOX299 Colorado Division of Reclamation Mining and Safefy MiningW <br /> LOVELAND, CO 80539 1313 Sherman Street, Room 215 <br /> Denver, CO 80203 <br /> OFFICE 970.667.2680 Nikie.gagnon@state.co.us <br /> FAX 970.667.0092 <br /> RE: Larimer Pit M1974-069,AM03 <br /> Dear Nikie, <br /> This is a formal request to reduce the frequency of well readings taken from the three <br /> monitoring wells placed adjacent to the current mining area, Cell 21, located within <br /> M1974-069. Included with AM03 for the current permitted area is an approved <br /> Groundwater Level Monitoring Plan for Pit/Cell 21, prepared by Bishop and Brogden <br /> Associates., dated October 30, 2015. <br /> Attached is a copy of the monthly readings that measure groundwater depth of the <br /> three monitoring wells. The first well readings were documented on March 30, 2015, <br /> and the latest monthly reading was taken on November 10, 2023. Additional dates to <br /> note, as documented, are as follows: <br /> 1. Dewatering of Cell 20, directly adjacent to and north of Cell 21 began in <br /> July of 2015. <br /> 2. Mining of Cell 20 was complete and dewatering ceased in August of 2019. <br /> 3. Mining Cell 20 was filled with groundwater on December 7, 2019. <br /> 4. Mining of Cell 21 began in March of 2020,which included the start of <br /> dewatering at the north east corner of this mining cell. <br /> 5. The compacted liner was installed along the east end of Cell 21 in July of <br /> 2021. <br /> At this time, LRM believes that adequate baseline data for all three monitoring wells <br /> has been established and that quarterly monitoring will now be adequate for <br /> identifying any significant changes in water levels or trends that may impact <br /> neighboring properties. In addition, the original water level monitoring plan did not <br /> identify any existing water supply wells or structures that would be impacted by this <br /> operation. <br /> We believe that current fluctuations in water levels support the opinions in the <br /> original monitoring plan and are the results of natural hydrology including <br /> precipitation events and changes that probably result from land uses including <br /> irrigation and irrigation return flows. <br />