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Environment, Inc. Page 3 <br /> Bestway Concrete- Rocky Flats Pit M-1987-113 <br /> September 9,2016 <br /> 52' below the ground surface. If the Operator contends the depth to groundwater is greater <br /> than the proposed maximum depth of the pit, then provide documentation which demonstrates <br /> the depth to groundwater in this area. Otherwise explain how the Operator will account for <br /> evaporative depletions associated with exposed groundwater. <br /> In the original application packet we based that depth on the <br /> drill logs we had from DOE back in the 1970 ' s. They said the <br /> water level was 52 feet below the surface. I think what was <br /> happening was that when the monitoring wells were drilled they <br /> partially filled with surface water over time and it was held in <br /> the well because of the high clay content in the material . At <br /> that time DOE was irrigating this area to regularly so there was <br /> an abundance of water being placed on the surface . <br /> When gravel mining began we found that there is no ground water <br /> like what is found along a river. Since no ground water has been <br /> encountered at the mine, I am unsure how I can provide <br /> documentation proving it . Review of the SEO' s well records for <br /> this area does not show many wells in the immediate vicinity of <br /> the mine. The closest well is northwest and is listed as being <br /> over 1500 feet deep to a producing water zone. In 2002 a test <br /> well was drilled on the adjoining property to the west, by Mr. <br /> Charlie McKay, he says that at 1400 feet they gave up finding <br /> water in any quantity that was usable. In 1987 Mr. McKay filed a <br /> well permit for the mine area that was denied on 12/14/87 and one <br /> of the reason for denial is the SEO says the site was not in a <br /> designated ground water basin. <br /> The mine floor is deeper then 60 feet at this time and when the <br /> water that accumulates in the excavated area is pumped out the <br /> floor stays dry until the next heavy storm event. No springs or <br /> water seeps have been found in the mine area. The standing plan <br /> it to pump the stormwater out as needed and distribute it on the <br /> surrounding land so there is no discharge. <br /> I hope this address the adequacy questions and if you need more information or have more <br /> questions, please call me. <br /> Sincerely, <br /> Environment, Inc. <br /> Stevan L. O'Brian <br /> President <br /> Enclosure <br /> cc Bestway Concrete <br /> Michael Cunningham (DRMS)-via e-mail <br /> file <br />