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Introduction <br /> This groundwater quality monitoring plan will be implemented at the Delta Paving Gravel Pit <br /> located in Delta County, just south of Orchard City, Colorado. This plan outlines the methods <br /> that the mine operator, Grand Junction Pipe & Supply Co., will follow to protect and monitor the <br /> integrity of the region's groundwater quality. This plan is intended to meet the requirements of <br /> the Division of Reclamation, Mining, and Safety (DRMS) Mineral Rules and Regulations Rule <br /> 3.1.7(7)(b) and the Colorado Department of Public Health & Environment (CDPHE) Regulation <br /> No. 41. The Delta Paving site is not located on any classified areas regarding groundwater; <br /> therefore, the statewide regulations (CDPHE Regulation 41) will be followed. <br /> This monitoring plan requires the collection of pre-operational groundwater quality data that will <br /> be used as the baseline data to compare to the results of continued long-term groundwater <br /> quality monitoring. As mining has already taken place on site, and Phase 1 and 2 of mining <br /> were permitted prior to the implementation of this plan, this monitoring plan will only apply to the <br /> Phase 3 and Phase 4 operations. Prior to opening Phases 3 and 4 of mining, pre-operational <br /> groundwater quality data will be taken. At least five quarters of monitoring data will be collected <br /> prior to disturbance in Phases 3 &4. Continued monitoring will take place during Phase 3 and 4 <br /> operations. Results of this monitoring will be used to evaluate if any adverse impacts on <br /> groundwater quality have taken place as a result of the Delta Paving gravel mining operations. <br /> The monitoring plan is discussed in more detail below. <br /> Groundwater Quality Monitoring Plan <br /> The goal of this groundwater quality monitoring plan is to define the baseline groundwater <br /> quality conditions and collect long-term groundwater quality data during mining of Phases 3 and <br /> 4 at the Delta Paving Gravel Pit. The long-term quality data will be compared to the baseline <br /> conditions of the site to determine if gravel mining operations have created any impact to the <br /> regional groundwater quality. <br /> 1 . Sampling Methods <br /> This section defines the locations and type of groundwater sampling that will take place at the <br /> Delta Paving Gravel Pit. Baseline sampling will take place prior to the beginning of Phase 3 and <br /> 4 mining, and will continue while these areas are being mined. <br /> 1 .1 . Sampling Location <br /> Groundwater will be sampled at one location, GW-1, on the Delta Paving Gravel Pit. The <br /> location of GW-1 will be on the northwest corner of the Phase 3 and 4 mining area as shown in <br /> Delta Paving Gravel Pit <br /> Groundwater Monitoring Plan G-2- 1 © Lewieki 81 Associates <br /> September 2022 <br />