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Because surface water flow monitoring, quality sampling, • <br />preservation and analysis techniques used at the Nucla Mine have <br />changed slightly from those described in the Nucla Mine permit, a <br />discussion is provided here to update this portion of the permit. <br />Table 2, previously cited, indicates the methodology used at each <br />of the surface water monitoring sites for measuring flow. Table 3 <br />lists the parameters for which the collected water samples are <br />analyzed and the frequency at which the samples are to be <br />collected. Table 4 indicates the sample type, preservative and <br />bottle type necessary for analysis of the particular constituents <br />shown. Raw and/or raw/acidified water samples are taken from the <br />sampling site and placed directly into properly prepared sample <br />bottles. Portions of the samples to be field filtered are forced <br />through a 0.45 micron membrane filter using a Skougstaad plastic <br />filter barrel and pressurized nitrogen gas and are then run <br />directly into the sample bottle. All sample bottles are <br />immediately placed in an iced cooler and delivered to a certified <br />contract laboratory at the end of the day. EPA approved water • <br />analysis holding times are met for all analyses indic<rted on Table <br />5. Field parameters of pH, conductivity and temperature are always <br />taken in the field at the time of sampling. On an annual basis, <br />this field equipment is tested against similar equipment used in an <br />EPA certified laboratory. On December 16, ::956, Dennis Jones, <br />Seneca II Mine Hydrologist, tested the field equipment used at both <br />Nucla and Seneca Mines against the equipment used by Bookcliffs <br />Laboratory in Steamboat Springs. Temperature and pH measured <br />exactly the same as that of the lab equipment. Conductivity <br />measured exactly the same as the lab's conductivity at. 700 umhos/cm <br />at 25°C, -2.8% at 1400 umhos/cm at 25°C, and -2.3% at 2700 umhos/cm <br />at 25°C. As a result, the field equipment used at both the Nucla <br />and the Seneca Mines appears to be accurately calibrated and in <br />excellent condition. <br />At this point in the discussion, two cla.rifica1;ions of the <br />monitoring program need to be presented and one deficiency needs to <br />be addressed. The first clarification involves Peabody's historic <br />10 Revised 03/06/87 <br />