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ITEC Environmental Colorado, Inc. January 6, 1999 Ms. Maxine Stewart Page 2 rate of the wells, the standard 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. Water collected 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 of the samples were field filtered for dissolved analyses by pumping the sample aliquots through a 0.4Sµ in-line disposable filter. The filter was purged with approximately 200 mL of sample water before the laboratory container was filled. Filters and mbing were used for only one sample and subsequently disposed. Collection of a groundwater sample from the Hazel A adit required the use of a bailer, since the water level was much lower than that which could be sampled by reaching over the timbered bulkhead. The bulkhead is located approximately 40 feet from the adit entrance. 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 I. Immediately after sample collection, laboratory containers were sealed, labeled and placed in an ice-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 assurancelquality control (QA/QC) sample was collected for laboratory analysis. Duplicate sample identified as Well f11B was collected at the same location and at the same time as the monitoring sample for Well pl (Well t11A), and labeled appropriately for separate analyses. This duplicate aliquot was collected by alternately filling quarter-bottle increments to ensure uniformity of the monitoring sample and the duplicate. FOURTH-QUARTER SURFACE WATER SAMPLING In addition to the groundwater samples collected from the monitoring well, Wynona mine and the Hazel A adit, as discussed above, a surface water sample was also collected as part of the quarterly compliance monitoring at the Site. The only surface water sample was taken from Left Hand Creek, collected just downstream of Lick Skillet Road. The sampling methodology for the Left Hand Creek sample was essentially the same as far 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 l-liter grab samples were collected from the surface water sampling location and composited in [he temporary collection container. Aliquots were then drawn for analysis as described above for the groundwater samples. As with the other non-dedicated sampling equipment, the 1-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 prior to use a[ each sampling location. J . \ 5461 \4TN QTR. LT R. w pd