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May 12, 2004 <br />Mr. Allen Sorenson <br />Division of Minerals and Geology <br />Department of Natural Resources <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />Dear Mr. Sorenson, <br />NATURAL SODA, INC. <br />3200 County Rd. 31 <br />Rifle, Colorado 81650 <br />1 — /cLf <br />Phone: (970) 878 -3674 <br />Fax: (970) 878 -5866 <br />RECEIVED <br />MAY 14 2004 <br />Division of Minerals & Geology <br />Subject: Well Cement Work and Logging Results for Subsidence Monitoring <br />Well 3M -TDR <br />As a result of recent 3M -TDR subsidence monitoring well completion activity and <br />discussions with the BLM, DMG and EPA, this letter provides details of recent <br />ce - : , : _ • • , : _ .. _ _ _ • • : • . nd logs (CBL). Enclosed please find <br />"Pump in '!'racer Survey" log of Aprit 9, 2004,. A Natural Soda Inc. (NSI) work - <br />r.repart # 1) is enclosed describing peril 9, 2004 activities and logging results, <br />which indicated downward water flow on the back side of the 4 1/4" casing. Flow <br />exited the annulus at or below 1550 — 1670 FFS. <br />After flow down the annulus was confirmed, cement work was performed per the <br />attached report (#1). Cement was pumped down the annulus, April 12, 2004, while <br />pumping sodium silicate down the 4 '/2" casing. Total cement pumped was 126 <br />barrels. On April 15, 2004 cement (— two yards) was added down the annulus <br />from the surface. <br />NSI observed positive results of the cement job, on the mining injection/recovery <br />flows. For the first time since 3M -TDR was completed in October 2003, injection <br />flow was greater ( -8 -10 gpm) than recovery flow. Logging of the 3M -TDR well <br />was ordered to confirm positive results of cement jobs. <br />On May 6, 2004 logging was performed. Fluid level of —500 FFS, limited logging <br />to below that depth. Fill material from cementing limited logging to above 1650 <br />FFS. Enclosed please find temperature log that indicates an increase of <br />approximately 14 degrees F from the May 6, 2004 log compared to the November <br />