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Mr. Zach Trujillo <br />November 20, 2015 <br />Page 11 <br />c. Please propose a monitoring point(s) that will allow the prediction of "no impact" to the Trout Creek <br />Sandstone to be verified. <br />Response: A response for this comment will be submitted at a later date under a separate cover letter. <br />ITEM 81. CCC proposes to discharge a very significant volume of water from dewatering wells (200-300 <br />gpm during years 1-3; 100-200 gpm during years 4-8; <100 gpm after year 8); potentially in the region of <br />3,000 acre -ft over 8 years. <br />a. Please clarify the legal right of CCC to this groundwater. <br />b. Please describe how the water will be used or discharged. Where will it be pumped to? What are the <br />anticipated impacts to the receiving drainage? <br />c. Please propose monitoring points that will allow the drawdown cone adjacent to the pit to be <br />characterized during the dewatering and recovery phases of the operation, and predictions made in the <br />PHC to be verified. <br />d. This is related to Item 1 in the initial adequacy review letter. <br />Response: A response for this comment will be submitted at a later date under a separate cover letter. <br />ITEM82. Section 2.06.8 of the PAP discusses operations on areas, or adjacent to areas, including alluvial <br />valley floors. The text describes a field investigation and technical evaluation of all drainages containing <br />streams within and adjacent to the permit boundary, including the Collom Gulch, little Collom Gulch and <br />West Fork of Jubb Creek drainages. The conclusion is that alluvial materials are present in these <br />drainages, but that they do not meet the definition of Alluvial Valley Floor. Please ensure that the <br />discussion in this section is consistent with the areas of Quaternary Alluvium and Irrigated Land shown <br />on Maps 7A and 1013. <br />Response: A reference has been included on Map IOB to direct the reader to Exhibit 7, Item 24, Figure 1. <br />The same reference is found in Section 2.06.8 of Volume 15. <br />ITEM 83. Map IOB shows Hydrologic Features and Monitoring Locations. The legend shows a symbol <br />for "Area of Quaternary Alluvium", and such areas are shown as existing in the Wilson Creek and Good <br />Spring Creek drainages. None are shown in the west of the proposed permit area. Please update Map <br />I OB to show all areas of Quaternary Alluvium within the proposed permit area and comment on any <br />differences in spatial extent between this layer and the layer shown on Map 7A as Qv (valley fill <br />deposits). <br />Response: Please see response to Item 82. <br />ITEM 84. The text in Volume 15, Rule 4, Page 10, states that the alluvial groundwater monitoring well <br />MC -04-01 "is additionally designated as a "Point of Compliance " well for alluvial groundwater <br />monitoring purposes." This appears to be contradicted by later statements, and in any case MC -04-01 is <br />not appropriately located to be a point of compliance since there is disturbance proposed in the Collom <br />Gulch drainage downgradient of MC -04-01. Please update the text describing MC -04-01. <br />Response: A response for this comment will be submitted at a later date under a separate cover letter. <br />AN EOUAL OPPORTUNITY/AFFIRMATIVE ACTION EMPLOYER <br />A Touchstone Energy'Cooperative <br />