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gently lowered into the water column in the well. The sample is obtained, striving to <br />disturb the well water column as little as possible during sampling and retrieval. Prior <br />to measurement, instruments and equipment (filters and instruments) aze rinsed with <br />distilled water. Field parameters are measured (Table 54) and the water sample is <br />filtered, divided into the proper sample bottles, sealed, cooled as appropriate, boxed, <br />and delivered to the laboratory for analysis. In some cases, samples may not be <br />available since there is insufficient water for sampling. This means that there is not <br />enough water to fill the sample bottles and an addidona1300 to 500 ml of sample for <br />rinsing and field parameter measurement. <br />Surface Water <br />Surface water monitoring is measured seasonally as described on page 2.05-62. <br />Monitoring measurements include measurement of flow, field parameters, and <br />laboratory parameters as identified in Table 54. Surface water flow is measured <br />through Parshall flumes (of vazying throat widths and heights) at the continuous <br />recording stations identified in the Surface Water Monitoring section of the permit <br />document. Continuous recording is accomplished through use of Stevens Type F <br />continuous recorders. Field data is maintained and compiled at the West Elk mine <br />office. Surface water monitoring sample measurements include field parameters, and <br />laboratory pazameters as identified in Table 54. Field parameters of temperature, pH, <br />conductivity, dissolved oxygen, and turbidity are procured at the surface water <br />sampling point by selecting a grab sample volume from surface water flow and <br />measuring the sample for the parameters using standazd instruments which have been <br />calibrated in the field daily. Samples for analysis of laboratory parameters are <br />collected by filling a clean pre-fixed sample bottle from non-aerated flow. Sample <br />bottles aze capped, labelled, placed on ice, and transported to the laboratory for <br />analysis. All equipment is rinsed before and afrer sampling with distilled water as well <br />as sample water prior to measurement of sample parameters. <br />2. The clean water diversion referred to in Exhibit 51; pages 36 and 37 is DCW-2. <br />Appropriate nomenclature changes have been made to pages 36 and 37 of Exhibit 51 <br />and the text in Volume l of the permit document. <br />3. The second paragraph on page 2.05-25 has been changed to identify the clean water <br />diversion ditch south of the haul road for the refuse pile as DCW-2. <br />4. An "as built" survey of the material storage bench and immediate slopes between <br />MB-1 and FW-1 was done on January 12, 1994. Based on the survey and the SAE <br />demonstration undertaken by Greystone Development Corporation, the entire material <br />storage bench in its current configuration can meet the effluent limitations of a SAE <br />(copy of SEDCAD+ run is attached). A copy of the ditch calculations for ditch DI-3 <br />with the additional flow from the south portion of the material storage bench aze <br />appended. <br />-2- <br />