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ORIGINAL -PUBLIC FILE <br />(Page 2) <br />MINE ID # OR PROSPECTING ID #: -~n-~(ln~-nnd <br />INSPECTION DATE: - t,[2R/Q8 INSPECTOR^SZNITIALS: -ft~ <br />OBSERVATIONS <br />The Division conducted a monitoring inspection of the site on 1/24/08. The main purpose of <br />the inspection was t:o discuss with the operator the Division's plan to set Ground Water <br />monitoring compliance wells with mutually agreed upon numeric protection levels for <br />selected metals and other elements. This was based on the five quarters worth of data the <br />operator provided to DRMS, ending June 2004 and prior to the plant commencing operations <br />producing cement clinker. The five quarters of data was for three shallow alluvium aquifer <br />wells in the St. Charles River(MW-002, MW-003 AND MW-004)and for one well in the Dakota <br />aquifer (DW-1). <br />The Division discussed the possibility of utilizing all of these as compliance wells with <br />numeric protection levels set for TDS, Magnesium, Sulfate, Gross alpha, Gross Beta, Radium <br />226 and Radium 228. None of the other parameters sampled showed any kind of metals that <br />indicated an upward trend. The water use for the upper alluvium aquifer is classified as <br />agricultural and they Dakota aquifer meets drinking water standards. There is a thick layer <br />of shale dividing tree aquifers. All mining activity will occur above this confining layer. <br />During the discussions prior to the field inspection, DRMS recommended that the operator <br />drill another well i.n the shallow alluvium at an agreed upon location below the plant and <br />up gradient of the existing shallow alluvial wells. The current location of the shallow <br />wells is at or near the permit boundary. In the event some of the parameters set as <br />numeric protection level exceed the standards set by DRMS, the operator will have <br />additional time to implement mitigation measures. The Division pointed out on the map, <br />possible locations f'or the new well and these were also discussed in the field. <br />After the meeting the plant area was inspected to observe progress on construction of the <br />various facilities that will be producing the clinker. During the plant site inspection, <br />the operator pointed. out a newly constructed water treatment facility which will utilize a <br />considerable amount of hydrochloric acid and Sodium Hydroxide to prepare industrial water <br />that will be used in. the manufacturing process. The facility included several tanks with <br />approximate capacity of 5,000 gallons situated in concrete containment berms, along with a <br />settling pond to be constructed outside of the building. <br />The limestone quarry area was inspected and it was active at the time of the inspection. <br />The operator confirmed that no excess kiln dust will be produced on site during the <br />production of clinker. All kiln dust will be re-introduced into the production stream and <br />consumed in the final product. <br />The existing monitoring wells were inspected and the deep well is ideally located in the <br />plant area in a down gradient location to capture any contaminants from the plant area. <br />The three alluvial aquifer wells are located on the south bank of the St Charles River and <br />within the flood plain. All wells were properly capped and locked. The Division suggested <br />that the operator place the well #'s on the cap for easy identification. The operator <br />agreed to this request. <br />The operator agreed to provide two Technical Revisions as soon as possible. These should <br />be submitted within 60 days of receipt of this report. <br />1) The first TR will be to cover the water treatment facility. The submittal must <br />include an as built design stamped by a professional engineer. The system must be <br />designed to contain the total amount of chemicals that will be stored with a 20~ <br />excess storage area that will never be utilized unless there is an emergency. The <br />sediment detention basin will have to have at a minimum a double lined stem (12 <br />inches of compacted clay to 95 ~ Procter and a 60 mil geomemabrane liner with a leak <br />detection and :pump back system to collect any solution that might leak in between <br />the two liners. The Division will also require one GW Monitoring well to be placed <br />down gradient Hof the pond, in the shallow alluvium. If the operator can demonstrate <br />