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RONALD K. BLATCHLEY <br />TED J. CAMPBELL, JR. <br />JAMES L. JEHN <br />FRED C. LADD <br />J <br />December 10, 1980 <br />• III IIIIIIIIIIIIIIII <br />999 <br />-~~~~ <br />GEC 1 t 1980 <br />Mr. Mark S. Loye <br />Reclamation Specialist <br />Mined Land Reclamation Board <br />1313 Sherman, Room 423 <br />Denver, Colorado 80203 <br />rrirar_~ ~Hr:n ~=c~ :, • Tioi <br />Ce!e. Deot. >> :~at~.,~, r.~sL_rc~s <br />RE: Brannan Sand & Gravel Company <br />M.C.A. 29 <br />Job No. 354.1 <br />Dear Mr. Loye: <br />This letter is written in response to the memo from your <br />office dated October 30, 1980 to Ann Hodgson of Brannan Sand and <br />Gravel referencing some concerns about MCA 29. On Page 3 of your <br />letter, Item $1 under the reference to Exhibit D, we understand <br />the concern is with the sealing of the northwestern perimeter of <br />Parcel B of that proposed pit. Under Item #1 the statement is <br />made that the "sealing is necessary to maintain a ten-foot dif- <br />ference in final water levels in the two pits". Our report sta- <br />tes and we further emphasize that the estimated ten-foot water <br />level differential is a result of the sealing effect of fines <br />deposited along the north and west perimeter of Parcel B. These <br />deposits will occur over a period of time and the estimated ten- <br />foot differential in water levels between the two pits will be <br />the progressive result especially during the mining and to a <br />lesser degree after mining when conditions have stabilized within <br />the two proposed pits. Item #1 of that exhibit goes on to ask <br />"why will this area of shoreline "seal" itself while others will <br />not?" Our report did not suggest that other areas will not be <br />sealed to some degree, however, the northwestern perimeter of <br />Parcel B will tend to be sealed quicker and to a greater degree <br />due to the ground water flow patterns from Parcel B toward Parcel <br />A as shown in the attached drawing. As the figure indicates, the <br />existing ground water flow is generally from the southeast toward <br />the northwest across the entire site and will continue in that <br />general direction once the two pits are constructed. In <br />addition, due to the very narrow stretch of unmined property near <br />the northwestern perimeter of Parcel B, the ground water flow and <br />sealing will be directly proportional to the density of the flow <br />lines between the two parcels as shown on the attached figure. <br />During mining and construction of the pits a great deal of sedi- <br />ment will be stirred up and due to the direction of flow out of <br />the pit, the fines will be concentrated against the west and <br />north perimeter of Parcel B as shown on the attached drawing. <br />blatchley c~llociater.inc. /CONSULTING ENGINEERS <br />2525 SOUTH WADSWORTH BOULEVARD, #306 • DENVER, COLORADO 80227 • (303) 989-6932 <br />WATER RESOURCES. WATER RIGHTS, GROUND WATER. HYDROLOGY ENVIRONMENTAL 8 GEOLOGICAL ENGINEERING. SURVEYING <br />