ARCHIVED REPORTS_GROUNDWATER AND SURFACE WATER MONITORING 3RD QUARTER 2015

Home Browse Search

Groundwater Sampling Procedure ' Sampling for General Mineral Analvsis Upon arriving at the Site on the sampling date(s), Ground Zero personnel opened all monitoring wells and made depth to water measurements. The monitoring wells were purged and sampled according to the procedure detailed below. Purging was started using the Waterra® purging system with dedicated tubing that has been installed in each well. Purging continued until the temperature, electric conductivity and pH of the groundwater had stabilized (<10% variation for three consecutive readings) indicating that formation water representative of aquifer conditions was entering the well. These water ' quality parameters were measured at intervals of each well volume purged. The wells were purged of at least 3 well volumes of stagnant water. After the well had recharged, a sample was collected from the Waterra tubing. The sample container was then identified and labeled with a unique designation, inserted into foam holders and placed into an ice chest cooled to 4°C for transport to the laboratory. ' All non-disposable sampling equipment was decontaminated using an Alconox® solution before and between uses. Disposable gloves were used by the geologist while collecting samples and were changed with each sample collected. A chain of custody document, listing all samples collected, accompanied the samples from field to laboratory, thereby providing a means to track their movement and ensure their integrity. ' During purging of the wells, various field parameters were measured. These included pH, EC, Temperature, Dissolved Oxygen (DO) and Oxidation-Reduction Potential (ORP). The field parameters are included in Table 3 and in the field data log sheets of Appendix C. Sampling for Bacteria Analysis To prevent the reintroduction of bacteria into the wells, the following procedure is followed anytime the monitoring wells are accessed: • Before opening the pressure caps of each well, they are sprayed with Clorox® bleach and ' then rinsed with de-ionized water. • Prior to making depth to water measurements in each well, the water level probe and tape are disinfected with Clorox® bleach and then rinsed with de-ionized water. ' Before closing the wells after sampling, each pressure cap was sprayed with Clorox® bleach and rinsed with de-ionized water to prevent the reintroduction of bacteria into the monitoring wells.