2023-11-21_GENERAL DOCUMENTS - M1974069

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Christopher J Sanlhe jeffrcy A Clark B B— Daniel() Nicnicla _Jonathan D.Gcorge Michael A.Sayler 131SHOP- BROGDFN ASSOCIATES, INC. CharlcsFStan_ione October 30, 2015 Ms. Stephanie Fancher Loveland Ready Mix Concrete, Inc. 1811 W. 12t" Street P.O. Box 299 Loveland, Colorado 80539 RE: Loveland Ready Mix Concrete, Inc. — Recommended Groundwater Level Monitoring Plan for the Larimer Pit 21 Dear Stephanie: This letter presents our recommendations for a Groundwater Level Monitoring Plan for the Larimer Pits including the proposed Pit 21. The proposed monitoring plan will utilize the recently installed monitoring wells which will be used to collect baseline information regarding the local hydrology and to satisfy the baseline monitoring period required by the Colorado Division of Reclamation and Mine Safety (DBMS). Proposed Groundwater Level Monitoring Plan Loveland Ready Mix Concrete, Inc. (LRM) currently operates a sand and gravel mining permit known as the Larimer Pits which is located in Sections 15, 16 and 17, Township 5 North, Range 69 West under the Colorado Division of Minerals and Geology Permit # 1974-069, as shown in the attached Figure 1. It is our understanding that LRM is currently amending its mining permit boundaries to add the proposed Track B also shown in the attached Figure 1 and referred to as Pit 21. The mining plan includes an estimated dewatering period of approximately 5 to 7 years, depending on market conditions. A ground water barrier (clay liner) will be constructed during mining and is anticipated to be complete shortly after the mining is completed. Groundwater Monitoring Points To facilitate the proposed monitoring program, LRM constructed three monitoring wells in March 2015 under approved monitoring well permits to provide depth to groundwater data. The monitoring wells are located along the exterior edge of the Track B property identified in Figure 1. Two of the monitoring wells are located along the southern boundary and one along the eastern boundary of Tract B, as summarized in the following Table 1. The well permits and construction details for these three wells are presented in Appendix 1.