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W RESOURCE <br /> `i HYDROGEOLOGIC <br /> SERVICES <br /> 1. Intended purpose of each well — documentation of groundwater presence, if present then <br /> documentation of water level and water quality through quarterly monitoring over time utilizing <br /> the approved and current compliance groundwater laboratory suite and methodologies for <br /> comparative purposes against existing Pueblo Plant monitoring wells as adopted in the Sampling <br /> and Analysis Plan(SAP),per Technical Revision TR-07. GCC will evaluate how to best monitor each <br /> proposed well for the long-term following construction and development and commits to <br /> submitting a subsequent TR for approval to revise the SAP appropriately. Additionally, GCC <br /> commits to continue (GCC started in 2021, quarter two) to have all compliance groundwater <br /> samples, as well as for those monitoring wells proposed here, analyzed for major ions to <br /> supplement the current TR-07 Table 1 GCC groundwater analytical parameters until the <br /> aforementioned subsequent TR to modify the SAP is approved by DBMS. <br /> 2. Placement of each well to achieve accurate water levels and/or representative water quality <br /> samples — proper design and installation methods to prevent groundwater from inadvertently <br /> migrating to strata above or below the target interval. <br /> 3. Adequate wellbore diameter to accommodate appropriate tools for well development, water <br /> quality sampling devices, and aquifer testing equipment —primarily a nominal 2-inch downhole <br /> surge block for development and nominal 2-inch environmental sampling bailer or pump as <br /> needed. <br /> 4. Surface protection at each well to assure no alteration of the structure or impairment of the data <br /> collected from the well—locking wellhead and bollard posts as shown in the design figures which <br /> are the same as the existing Pueblo Plant monitoring wells MIN-5, MW-6, MW-7, and MW-8. <br /> Critical to be completed during this monitoring well installation program is the accurate documentation <br /> of the site subsurface geology. The field hydrogeologist from Resource Hydrogeologic Services, Inc. (RHS) <br /> shall direct the GCC-contracted drill crew with respect to specific target formation depths and collect and <br /> document geologic samples generated by rotary cuttings or core samples as applicable. <br /> WORK PLAN <br /> Work has been conducted by RHS to support the Pueblo Plant monitoring well installations. This has or <br /> will include well design, materials specification, required Colorado Division of Water Resources (CDWR) <br /> monitoring well permitting, drilling and completion service solicitation and coordination, underground <br /> utility locates/clearance services for drill sites, professional surveying services, as well as project <br /> coordination as needed with CDRMS and ongoing Pueblo Plant operations. <br /> MONITORING WELL PERMITTING <br /> RHS, as the authorized agent of GCC, shall submit the appropriate CDWR monitoring well permit <br /> applications (GWS-46 forms) for each planned and potential well and obtain the corresponding permits <br /> to construct in advance of mobilization for drilling and completion activities. Following the monitoring <br /> GCC Rio GRANDE,INC.PUEBLO PLANT <br /> 2021 MONITORING WELL INSTALLATION PROGRAM WORK PLAN <br /> 4 <br />