2018-01-16_PERMIT FILE - M2017036 (2)

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Second Submittal 1.0 INTRODUCTION A groundwater study was conducted by Telesto Solutions,Inc. (Telesto)to assess potential impacts associated with the proposed Loveland Read-Mix's LaPorte Operations, Knox Pit (Pit) sand and gravel mine. The proposed sand and gravel mine will require the dewatering of pits, transfer of groundwater, and the management of the affected groundwater levels. To gain a thorough understanding of potential outcomes of the proposed mining project, conceptual models were developed that summarize the available data and mechanics of the groundwater system. These conceptual models were used to build a numerical representation (i.e., numerical model). The numerical model was then calibrated using measured groundwater level,data,,and predictive scenarios that simulated mining impacts. Based on these predictive scenarios, mitigation plans and management techniques were created and tested in simulation to verify the efficacy of the mitigation plans and ensure groundwater resources would not be harmed. 1.1 Project Description Loveland Ready-Mix Concrete, Inc. (LRM) is proposing a new sand and gravel pit, and associated concrete batch plant located adjacent to Larimer County Road 54G, approximately one-half mile west of Taft Hill Road (Site). The sand and gravel pit and associated concrete batch plant are called the LaPorte Operations (Project). LRM is seeking approval for the Project through Larimer County's Use by Special Review process. The total Project area is 126.58 acres. When sand and gravel mining has ceased,disturbed areas will be reclaimed to natural agricultural conditions with the former gravel pit areas reclaimed for pasture. The Project will include phased reclamation so that as mining progresses across the properties, mined and disturbed areas will be sequentially lined, backfilled, re-graded, and revegetated. The Site lies approximately 4,000 feet north of the Cache la Poudre River (River) and contains alluvial sand and gravel deposited by the ancestral Poudre River. The area to the south of the Project has experienced extensive sand and gravel mining operations, both historically and currently, as seen in Figure 1. Loveland Ready-Mix Concrete 1 Telesto Solutions,Inc. znisoi 1z_gML[l]awW�may_ziia,umimiaI d January 2018