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NORWEST <br /> COR PORAT ION <br /> To: Tony Waldron Ref# 591-6 <br /> CC: Transit Mix Concrete Co. Date: May 19,2017 <br /> From: Paul Kos <br /> Subject: Proposed Hitch Rack Ranch Baseline Groundwater and Surface Water Sampling <br /> Introduction <br /> Transit Mix Concrete Co. (Transit Mix)is planning to drill several boreholes to characterize rock quality <br /> and groundwater resources to support the mining and reclamation permit application for the Hitch Rack <br /> Ranch Quarry. These boreholes will be completed as monitoring wells or piezometers. The locations are <br /> shown on Figure 1 of the attached Notice of Intent. This memorandum summarizes the proposed <br /> monitoring Transit Mix will perform to characterize the baseline conditions in the vicinity of the proposed <br /> quarry. <br /> Sampling Overview <br /> Transit Mix will collect surface water and groundwater samples and monitor surface water and groundwater <br /> levels to characterize the hydrologic conditions at the proposed quarry. Transit Mix may choose to collect <br /> additional samples and/or collect additional water level data to supplement the data collected as part of this <br /> monitoring. All data collected will be provided to CDRMS in the initial permit application, adequacy <br /> responses,and as permit addendums. <br /> Surface Water Monitoring <br /> Surface water monitoring will occur at two surface water monitoring stations,LTC-SW-1 and LTC-SW-2. <br /> LTC-SW-I will be located upstream of the mining operations and LTC-SW-2 will be located downstream <br /> of the mining operations, but upstream from the fault. A pressure transducer will be installed at each <br /> monitoring location to capture continuous stream depth and will be programed to collect data every 15 <br /> minutes. The data will be downloaded monthly. Instantaneous flow will be measured during each of the <br /> monthly site visits. A rating curve will be developed using the continuous stream depth and instantaneous <br /> flow measurements. The rating curve will be used to estimate flow for each of the continuous stream depth <br /> measurements resulting in a flow hydrograph illustrating flow over time. Water quality samples of Little <br /> Turkey Creek will be collected monthly,and the samples will be analyzed for the parameter list summarized <br /> in Table 1. <br /> Groundwater Monitoring <br /> Transit Mix proposes to install six groundwater wells,with one well will be located upgradient of the mining <br /> operations and one well will be located downgradient of the mining operations,but upgradient of the East <br /> Fault, all within the Hitch Rack Ranch property boundary. The shallowest completion of these two wells <br /> that is not directly influenced by creek flows (demonstrated by water quality and level) will be used for <br />