Laserfiche WebLink
., <br />Gregg Squire <br />- 2 - March 12, 1986 <br />If this is the case however, a further analysis of the geologic and hydrologic <br />picture is necessary to substantiate this claim. For example, what is the <br />directional permeability? Is the permeability controlled by channel sands or <br />fractures oriented along the axis of the Chandler Syncline? Please <br />investigate further as the explanation that "The amount of seepage has been <br />directly related to proximity of the Last Chance Mine and the strike of rolls <br />in the formation,..." does not seem adequate to answer all the questions. <br />Additionally, how much water is actually present in the Last Chance Mine? <br />The statement "Due to the character of the seepage, accurate sampling of the <br />ground water is impossible" does nothing to resolve the questions generated by <br />this report. Please explain what the "character of the seepage" actually is <br />in physical terms. Is it too diffuse, for example? <br />Several members of the Division examined data on water quality at the <br />Dorchester No. 1 Mine and found certain similarities to the Twin Pines ground <br />water in chemical parameters in a well designated MW-7A. Similar values for <br />fluoride and several metals were seen in this well when compared to the wells <br />at Twin Pines. It seems that Well MW-7A was completed in a coal seam called <br />M1, which was mined in the old Mountain View Mine. Correlation between the <br />Brookside Seam (Twin Pines) and the M1, seam is likely. If this is the case <br />then it is possible that ground waters generated from old mine workings may <br />show these chemical characteristics in this seam. <br />Because of this possibility, it is felt that water quality monitoring in the <br />Caldirola No. 2 Well should cease and monitoring of parameters should begin <br />for one of the wells on the north side of the mine. Perhaps one of the <br />Rockvale water supply wells would be a good choice if available. <br />Since the report indicates that ground water entering the mine may be flowing <br />in a northeasterly direction and that inflows are being discharged at the <br />portals, then it may be necessary to place an alluvial monitoring well in <br />Lewis Gulch as this stream system directly enters the Oak Creek AVF to the <br />north. Surface and surficial ground water (alluvial) flow are probably in a <br />northerly direction following the topographic expression as opposed to the <br />deeper bedrock flow which probably flows down dip in strata in a southerly <br />direction, paralleling the axis of the Chandler Syncline. <br />The operator must address the Division concern of impact to the Oak Creek AVF <br />and propose a monitoring plan if applicable. <br />Please respond to these issued by The Division will <br />discuss any of these concerns with t e operator i urther clarification is <br />requested. <br />cc: Gregg Squire <br />Candy Thompson <br />Mike Long <br />srs <br />8362E <br />