Laserfiche WebLink
Alk <br />Natural Soda LLC <br />2015 Project Status Report & Annual Plan of Development <br />4.4 Geotechnical Program <br />NS currently monitors two time -domain -reflectometry (TDR) subsurface -subsidence <br />monitor wells, the 4A -5M and 3M -TDR. There has been no indication of surface or <br />subsurface subsidence near the 4A -5M well since installation. One of the TDR cables in <br />the 4A -5M well is showing evidence of water infiltration. The 3M -TDR well was drilled late <br />in 2003. Two of the four TDR cables in 3M -TDR subsidence well were corrupted during <br />installation and not operable. In 2015, readings were again taken and data was gathered <br />from cables two and three. In addition to the monthly NS readings, the installation <br />contractor also collects data quarterly; no significant ground movement has been detected <br />near the 3M -TDR well since the cables were installed. <br />4.4.1 Subsurface Subsidence Geophysical Logging <br />No production well pairs were drilled at NS in 2015. No gamma ray and casing collar <br />locator (GR/CCL) logs were required to establish baseline conditions for future <br />geophysical log subsidence monitoring. <br />4.4.2 Surface Subsidence Monitoring <br />Three new surface subsidence monuments (SSM) were installed in 2015 to monitor <br />surface subsidence above the proposed 15H, 16H, and 17H production intervals. <br />These new surface monument along with the existing 14 monuments located <br />throughout the well field yield a total of 17 SSMs above NS's area of operations. A <br />general surface subsidence survey was conducted in April of 2015. A review of the <br />2015 survey indicated no surface subsidence. A surface subsidence survey of all SSMs <br />will be conducted in 2017. <br />Results of the 2015 SSM Survey are shown in Table 5 below. <br />4.5 Water Well Pumpage <br />In 2015, approximately 125.4 million gallons of water was pumped from water supply <br />wells 90-1, WSW -2, WSW -3, and WSW -4 with an average of 237.5 gpm. The total <br />pumpage from WSW -2 was 35.0 million gallons, WSW -3 was 24.7 million gallons, <br />WSW -4 was 44.7 million gallons and the total pumpage from 90-1 was 21.0 million <br />gallons. <br />DAUB & ASSOCIATES. INC. . 18 <br />January 2016 <br />