HYDRO25613 - Laserfiche WebLink

Home Browse Search

ITEC Environmental Colorado, Inc. Ms. Maxine Stewart ~] March 26, 1999 Page 2 (typically 6 inches), the depth ofwater in the wells (typically in excess of30 feet), and the slow recharge rate ofthe wells, the standazd practice of purging three casing volumes of water prior to sampling was omitted. Five bailer volumes (approximately 5 liters) were removed from each well to ensure adequate sample volume. Watercollected from each well was placed in a temporary container that had been cleaned with a dilute nitric acid solution and rinsed with water from the sample collection location. Sample aliquots were pumped from the temporary collection container into appropriate laboratory-supplied containers using a peristaltic pump and silicon tubing. All ofthesampleswerefieldfilteredfordissolvedanalysesbypumpingthesamplealiquots through a 0.45 µ in-line disposable filter. The filter was purged with approximately 200 mL of sample water before the laboratorycontainerwasfilled. Filters and tubing were usedforonlyonesampleandsubsequently disposed. The groundwater samples from the Hazel A adit and the Wynona were col lected by compositing five 1-liter grab samples into a collection container in a mannor similar to that described below for surface water sample collection. Indicator water quality parameters, including pH, temperature and specific conductance were monitored for all samples, as well as other pertinent data such as observed color and any noticeable sedimentation. These field parameters were recorded on Groundwater Sampling Record forms. The field parameters for each well are summarized in Table 1. Immediately after sample collection, laboratory containers were sealed, labeled and placed in anice-cooled, insulated chest for storage, pending delivery to the laboratory. Chain-of-custody forms were also completed and signed by the field personnel and placed inside the ice chest. In addition to collection of six compliance monitoring groundwater samples, one field quality assurance/quality control (QA/QC) sample was collected for laboratory analysis. Duplicate sample identified as Well #2B was collected at the same location and at the same time as the monitoring sample for Well #2 (Well #2A), and labeled appropriately for separate analyses. This duplicate aliquot was collected by alternately filling quarter-bottle increments to ensure uniformity ofthe monitoring sample and the duplicate. FIRST-QUARTER SURFACE WATER SAMPLING In addition to the groundwater samples collected from the monitoring wells, Wynona mine and the Hazel A adit, as discussed above, two surface water samples were also collected as part of the quarterly compliance monitoring at the Site. One surface water sample was taken from Left Hand Creek, collected just downstream of Lick Skillet Road and the other surface water sample was taken from the Gold Hill Mill Tailings Pond. The sampling methodology for these samples was essentially the same as for the well samples, with the exception that a 1-liter HDPE wide-mouth sample bottle was used instead of well bailers as the collection device. A total of five 1-liter grab samples were collected from the surface water sampling locations and composited in the temporary collection container (churn-sputter). Aliquots were then drawn for analysis as described above for the groundwater samples. As with the other non-dedicated sampling equipment, the l-liter sampling bottle and the temporary collection container were cleaned with a dilute nitric acid solution and rinsed with water from the sample collection location priorto use at each sampling location. ):15461 \ I Q7R99.L7R.wpd