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mining pit is 0.297 feet (3.6 inches) of depth. Based on the hydraulic conductivity, this means that <br />the stormwater of the 100 -YR event will infiltrate in less than a day. <br />3. Groundwater <br />Since the test pits did not show groundwater and there are no visible seeps or springs, groundwater <br />is not expected to be encountered during mining. While no groundwater is anticipated to be <br />exposed by excavation, if it is exposed, excavation will cease at an elevation of 2 feet above the <br />groundwater level. <br />4. Irrigation Water <br />Irrigation water will be supplied by the landowner via water right from the Colorado River covered <br />under decree 07CW16. <br />5. Water Consumption for the Operation <br />Water supply for the proposed pit operations will be needed to cover a variety of uses. Based on the <br />location of the pit an independent water supply will need to be developed. This supply will create <br />water rights depletions that can be replaced through contract water available from the Colorado <br />River Water Conservation District. Below is a summary of the water uses proposed, the amounts of <br />water needed for these uses, and recommendations on how to meet those water needs. <br />Rincon Materials operations will involve the excavation of a dry alluvial terrace that exists above <br />the local water table. No groundwater exposure will take place, so there will be no need for <br />permanent augmentation. Almost all of the water usage within the pit will be in support of mining <br />and reclamation activities that are non -permanent in nature. Consumptive needs for the operation <br />are based on an anticipated production of 225,000 tons a year. Water demand will come from dust <br />control on crushing and screening, dust control on disturbed areas, and wash plant processing. <br />The Pit is on an elevated terrace and there is no groundwater on the terrace. This is known from <br />existing operations on the terrace further north of this site and also the lack of springs emanating <br />from the base of the gravel anywhere on the site. There is very little moisture in the gravel that will <br />evaporate when the material is mined. <br />Rincon Materials G-5 CM lxwkki and Ass ia(MP1JA <br />February 2020 <br />