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y • ~ III IIIIIIIII IIII III <br />999 <br />Michael J. Galloway <br />Consulting Hydrogeologist <br />10420 W. Evans Ave. <br />Lakewood, Colorado 80227 <br />(303) 9884616 Fac (303) 9867889 <br />May 6, 1993 <br />E. Peter Matthies <br />NCIG, Inc. <br />29 Glen Eagle Circle <br />New Castle, Colorado 81647-9767 <br />Re: Various Issues From MLR, Permit C-84065 <br />Dear Peter: <br />It is my understanding that several relatively minor issues have been raised by MLR concerning <br />Permit C-84-065. I have addressed the issues assigned to me and have provided both an <br />explanation and backup information. The issues are as follows: <br />Verification of dry conditions in wells OW-3L, OW-7, OW-12, and OW-13: These <br />four wells have been dry since drilled. During the first year or two of use of these <br />wells, all of the wells were visited by the sampler each sampling period to verify the dry <br />conditions. Subsequently, the inspection frequency was reduced to approximately once <br />per year since the wells have never shown any water. The upgradient wells (OW-3L and <br />7) and the downgradient wells (OW-12 and 13), have been dry over 10 and 7 years, <br />respectively. Copies of the original logs of OW-3L and 7 and various field book and <br />data sheets back to 1983 are attached. The well names have changed slightly during the <br />period, but are highlighted for easy identification. <br />It is my understanding that one of the upgradient wells appeared to have water, as <br />detected by dropping a rock. It is possible that due to the extremely wet conditions this <br />winter, that water has entered the casing either directly through the top, which I <br />understand was not on at the time, or through the screen which comes nearly to the <br />surface. These wells have about 4 to 6 inches of blank casing at the bottom which is <br />also capped. It is possible that water can become trapped in the bottom of the casing <br />until it evaporates. <br />