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-~2-ail <br />From: 1i- <br />Sent: <br />To: ,~ <br /> <br />~ ~S <br />Cc: <br />Subject: ~1/ <br />/Thursday, February 12, 2004 11:01 AM <br />Jackson.Dan@epamail.epa.gov; Wiser.Nathan@epamail.epa.gov; <br />Phillips.Ken@epamail.epa.gov; Ed Baker; paul_daggett@co.blm.gov, / ~---- <br />barbotk@naturalsoda.net; bellrjg@naturalsoda.net; Gregg.squire@state.co~ Sorenson, <br />Allen; ' rica.crosby@state.co.us' <br />~5favnes.Sandra@epamail.epa.gov; Evans.Elisabeth@epamail.epa.gov; <br />Salaza r. Mario@epam a i I. epa.gov <br />Cementing Problems Associated with New DR Monitorin Well at Natural Class III <br />Facility---Summary fo Conference Call with atural Soda <br />wl--l~~> -191 <br />This E-Mail is intended as a brief record of the February 11, 2004, <br />conference call (10:20 AM) with Ed Baker and his well field drilling <br />supervisor, Rod Storey. The purpose of the conference call was to <br />discuss problems that Natural Soda, Inc. (NSI) is experiencing with <br />their newly installed time domain reflectometry (TDR) subsidence <br />monitoring well. <br />The approval of NSI's drilling plan for a new subsidence monitoring well <br />(SMW), 3M-TDR was granted in August of 2003. This well is a replacement <br />£or SMW 2M-TDR which is located near the SH-6H intersection of lA <br />cavity. SMW 3M-TDR was located 20 feet North and On the same drill pad <br />as 2M-TDR. NSI approved plan called for the installation of four TDR <br />cables on the outside of a 4-1/2 inch casing. The cables will be set <br />45, 65, 85 and 105 feet above the Dissolution surface. NSI proposed to <br />construct the monitoring well such that conventional gamma logging could <br />be used to obtain subsidence information in the event of a cable <br />failure. <br />The following is a summary of the results of the installation of the <br />well. <br />+ An 8-3/4 inch hole was drilled to a total depth of 1833 feet <br />below ground surface (BGS). The depth was determined to be such that <br />the bottom of the hole was 45 to 50 feet above the Dissolution Surface <br />(DS). The top of the L-5 Zone (the Injection Zone) is at 1784 feet BGS. <br />The base of the B-Groove (first major USDW) is at 1602 feet BGS; the <br />base of the A-Groove is at 1400 feet BGS; and the Perched aquifer is at <br />400 feet BGS. The logs run on the hole indicate that the bottom hole <br />location was at the desired depth range based on comparisons with logs <br />from other wells. The e-1/2 inch bore hole was logged with a caliper <br />log. The results of the caliper log indicate the presence of a large <br />washout from about 1760 to 1714 feet BGS. <br />+ A 4-12 inch Casing with 4 TDR Cables strapped to the outside <br />was placed in the hole with casing centralizers set every 20 feet. The <br />well was cemented and the top of good cement was determined to be 1766 <br />feet BGS using a cement bond log. The remainder of the cement <br />apparently went into the lost circulation zone. A temperature log was <br />run in the well which indicated that the temperature increase was much <br />less than normal (53 to 58 F) down to the top of the lost circulation <br />zone (1714 feet BGS) where the temperature was only about 60 degrees F. <br />At the base of the log (1825 feet BGS). the temperature was <br />approximately 220 degrees F, rather than the expected 90 degrees F. Two <br />of the four TDR cables have failed, but the remaining two cables <br />continue to function properly. <br />1 <br />