REP03020 - Laserfiche WebLink

Home Browse Search

y ~ a , Division of Mining and Geology Department of Natural Resources January 13, 1993 Page 2 The ground water and surface water samples were collected according to the procedures identified in the Protocols by Halepaska and Associates, Inc. personnel during the period October 12 through October 15, 1992. In addition, water samples were collected from the five process points; upper and lower tailings impoundments, collection pond, pre-detox and post-detox. These samples are labelled accordingly on the attached analysis report. No samples were obtained from the lysimeters, due to the absence of collectible fluid in the lysimeters. The samples were submitted for analyses of the water quality parameters listed in Table 1. Sample handling and analyses proceeded in accordance with the Protocols. A copy of the report prepared by Core Laboratories is enclosed as Appendix A. Field quality control was instituted with the collection of a field duplicate, field blank and rinse blanks, to evaluate analytical and sample handling techniques. The sample identified as M-24 is a duplicate sample of M-4. The sample identified as FB is a field blank consisting of on-site laboratory-provided de-ioni2ed, distilled water. The samples identified as BFRB and BLRB are rinse blanks of the barrel filter used in filtering field samples and the bailer used in collecting ground water samples, respectively. Surface water samples were collected at surface stations RS-1, RS-2 and RS-5. The other surface water stations were found to be dry or have insufficient flow to collect samples. In addition, the lower sediment sampler was removed from station RS-1 and submitted for total suspended solids analyses. The sample is identified as RS- 1SS. Sediment samplers at the other surface water stations were dry. During the purging of well M-4, the discharge water progressively became cloudy and turbid. This behavior is common to past sampling events. During this sampling event, however, the water had a chlorine-like odor, and the specific conductivity (1,524,µs/cm) and pH (6.3) measurements were anomalous with past trends. Analysis indicates that this sample has elevated levels of ammonia (3.76 mg/L) and chloride (G3 mg/L) over historical values. With the exception of cadmium, the analyses from any of the other surface and ground water samples do not indicate any anomalous values. Core Laboratories has prefaced their analysis report with a narrative indicating that several cadmium values (samples collected at RS-1, RS-2, RS-5) had dissolved values that were