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Concerning the new monitoring wells, the Division accepts the following: the proposed locations and <br />quantity (minimum of two) new monitoring wells to be developed; that the two new wells will be located <br />downgradient and may function as the designated compliance wells; and that the details of the drilling, <br />logging and screening may be submitted later for Division review and decision. At the present time, the <br />Division approves that the compliance levels may be set according to the "ambient" levels found in the <br />existing groundwater wells (the "well nest"). [See additional note concerning the "well nest" below.] The <br />Division approves the proposed quarterly sampling frequency for the compliance wells, to occur throughout <br />the duration of the life of the permit, unless conditions arise necessitating a different sampling frequency or <br />duration. Sample analyses must include all required analytes (as described in the Division's memo dated <br />February 9, 2010, attached to the Division's letter to Denison dated February 17, 2010); all analyses must be <br />provided to the Division in a timely fashion. Please provide written acceptance of this requirement. <br />Concerning the existing groundwater monitoring wells, aka the "well nest," the Division accepts the <br />monitoring plan, and accepts the past quarterly monitoring data as contributing to the establishment of the <br />water quality compliance levels, discussed above. However, given the small set of wells being sampled, and <br />the short sampling history, the Division requires Denison to accept that four additional quarters of data <br />(beyond the number of quarters already required) from the well nest must be produced. After those analyses <br />are reviewed by this office, Denison will be notified whether there will be any further compliance parameters <br />required. Please provide written acceptance of this requirement. <br />Ore Pad Liners. <br />The Division accepts the following aspects of the ore pad liners: the locations upon each of the five mine <br />pads; the dimensions of the ore pads; the chosen PVC liner material; the ore pad design, including bedding <br />and cover materials; and the installation specifications and certification. <br />The geotextile liner material to be used will be PVC as detailed in Denison's proposal. The plan proposes <br />that each liner will be manufactured and shipped to the sites as one-piece liners to install. If the liners are <br />one-piece units, the presumption is that all seaming and testing was performed by the manufacturer at the <br />manufacturing facility, and the Division accepts that there is no need for seaming at the site at the time of <br />installation. However, in lieu of onsite seam testing, the Division will require copies of the manufacturer's <br />tests for each of the liners. Please provide written acceptance of this requirement. <br />Earthen sub-grade and cover materials to be utilized will be obtained onsite, and handled and processed <br />according to Denison's proposal. Follow-up certification reports that include all aspects of the installations, <br />must be provided to the Division, for each liner installed. Please provide written acceptance of this <br />requirement. <br />All site preparation and installation must proceed according to the approved plan, and overseen and <br />documented by qualified onsite QC monitor, who, per Hard Rock/Metals Rules, must be a Colorado <br />registered PE. The installation of the pad will be performed and overseen by qualified personnel, as <br />described by the manufacturer and also proposed by Denison. This will include deploying under proper <br />conditions of ambient temperature, wind, soil moisture, precipitation, proper trenching and anchoring, and <br />performing the necessary inspections throughout the process. Please provide written acceptance of this <br />requirement. <br />Low Pressure Ventiliation Bulkhead.