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PRINCIPIA <br /> November 22"�, 2019 <br /> Gilcrest Groundwater Flow Model <br /> Hypothetical Pumping Wells & Drains <br /> Hypothetical Pumping Wells <br /> Extracting from the October 2016 Dewatering Improvements Study`by JVA, Inc and Bishop-Brogden <br /> Associates, Inc. for the Town of Gilcrest, Colorado, three hypothetical pumping wells were selected to <br /> evaluate the effects of pumping. Three wells were simulated in the groundwater flow model to pump at <br /> varying rates for three years of operations to evaluate the effects of pumping on water level elevations <br /> in the immediate vicinity of the Town of Gilcrest. The locations of these three pumping wells were <br /> selected to match the locations of the Town of Gilcrest Waste Water Treatment Plant (WWTP), Pump <br /> Station 1 (PSI) and Pump Station 2 (PS2), as depicted in Figure 2.4 of the Dewatering Improvement <br /> Study report. The three hypothetical pumping wells and monitor wells in the vicinity are depicted in <br /> Figure 1. <br /> Pumping Rates of the three wells: <br /> Well Pumping Rate (gpm) Pumping Rate (cfs) <br /> WWTP 450 —1.0 <br /> PS1 2500 —5.6 <br /> PS2 1400 —3.1 <br /> The hypothetical pumping rates for these three wells are shown in Figure 2. These three wells were <br /> each simulated to pump at their varying rates for a period of 36 months. <br /> Hypothetical Drains <br /> In addition to simulating pumping from three wells, a set of hypothetical drains were placed along the <br /> west and south-east perimeter of the Town of Gilcrest. The locations of the modeled drain cells are <br /> depicted in Figure 3. Two separate groundwater model simulations were undertaken with these <br /> perimeter drains, with the bottom drain elevations set at 2' and 5' below the starting water table. The <br /> locations of the pumping wells and drains, in relation to the model transmissivity, are depicted in <br /> Figure 4. <br /> PRINCIPIA MATHEMATICA INC. <br /> 445 UNION BLVD, SUITE 230 LAKEWOOD, COLORADO 80228 <br /> WEB www.prinmath.com TELEPHONE (303) 716-3573 FAX (303) 716-3575 <br />