Laserfiche WebLink
October 2012 <br />Attorney Work Product, <br />Confidential and Privileged <br />10 <br />103- 81640A <br />2.2.3 Well Development <br />After the grout has set for a minimum of 24 hours and there has been sufficient time for the groundwater <br />to enter the well, the wells will be developed to improve water flow into the wells and reduce turbidity by <br />removing fines from the screen and sand pack. Development will be conducted using a combination of <br />surging and bailing /pumping or air lifting methods. During development, field parameters of pH, specific <br />conductivity, and temperature will be measured after each casing volume removed. The wells will be <br />developed until turbidity is reduced and field parameters have stabilized, or after five casing volumes <br />have been removed, whichever comes first. <br />Equipment used for well development with either be new materials (such as tubing, surge blocks, and <br />inertial foot valves or disposable bailers) or will be decontaminated using a low phosphate soap (such as <br />Alconox) solution followed by a distilled water rinse. <br />2.2.4 Well Hydraulic Testing <br />After development, hydraulic (slug) testing may be conducted in some or all of the wells to determine <br />estimates of saturated horizontal hydraulic conductivity (Ksat). However, slug testing will not be <br />performed in wells where adequate hydraulic conductivity estimates were obtained from borehole packer <br />injection testing. Slug tests consist of creating a sudden change in the water level and then monitoring <br />the water level as it returns to static. This sudden change in water level will be created by removing water <br />or displacing water when submerging a solid object into the water column of the well. Water levels will be <br />monitored using an electronic pressure transducer and datalogger following slug injection and /or <br />withdrawal. Slug test data will be analyzed to estimate Ksat values using commercial software, such as <br />AQTESOLV, or equivalent. <br />2.3 Review of Water Supply Well Information <br />As part of the field investigation, a review of publically available information will be conducted for the <br />previously identified nearby private wells to ascertain if there is available geologic or water chemistry <br />data. This well information will be used in an attempt to answer DRMS's questions regarding the <br />likelihood that other nearby wells are completed in the same aquifer and may be impacted. This <br />information search will be for both upgradient and downgradient wells, if they exist, and will include <br />records from agencies such as the Colorado Division of Water Resources (DWR), Larimer County, and <br />the U.S Geological Survey. As mentioned previously, this information will aid in evaluating if there are <br />impacts from CKD disposal and in addressing DRMS's questions about: <br />• The vertical and horizontal extent of impacted groundwater; <br />• Whether potential impacts are confined to within the permit area; <br />• What the likelihood is that these other wells are constructed in the same water bearing <br />units; and <br />\10 \81640\ 0400\ characterrzattonpin_ fnl- 23oct12 \charactenzationpin_fnl- 23octl2 docx <br />® <br />Golder <br />Associates <br />