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<br />• However, when such a vacuum source is used, a filter f1asF; <br />or similar water trap should be installed in the vacuum line <br />between the engine and the sampler. After the sample has <br />been ta4;en, the sampler sonde should be disassembled and <br />cleaned, including a final rinse with distilled water. The <br />Sinco unit is easily disassembled for cleaning. The well <br />purging procedure is normally sufficient to flush the <br />sampler tubing as the fluid passing through the tubing <br />during the purging operation ultimately represents the fluid <br />to be sampled. As the sample sites are not far from the <br />mill's analytical laboratory, the filtration of these <br />samples can be performed in the lab at much greater <br />efficiency than in the field, providing that the sample is <br />filtered within 24 hours after collection. As such the <br />ground water samples can be collected in one gallon <br />polyethylene containers in the field and transported to the <br />lab. Two gallons should be a sufficient quantity from each <br />site. The gallon-size field sample containers can be reused <br />provided they are properly washed and rinsed with acidified <br />and plain distilled water. Surface water samples can be <br />collected directly into the containers used for preservation <br />and shipment. <br />The water temperature, pH and conductivity of the sample <br />should be measured and recorded at the time of sampling. <br />• Quality portable instruments for this purpose are available <br />from Cole Parmer Instrument Company as well as other <br />suppliers. We recommend the Cole Parmer Model R-1481-50 <br />Conductivity meter with probe and Model R-5994-00 LCD pH <br />Meter kit. Both units with a supply of Conductivity meter <br />calibrating solution would cost appror.imately $450. <br />The water levels should 6e measured in each well prior to <br />purging the stagnant casing fluid as this represents the <br />static water level at equilibrium. The Cisco Model WL-300 <br />M-Scope Water Level Indicator has been a very popular unit, <br />costing appro:;imately X200. This model can measure to depths <br />of 300 feet. Measurement should be to the nearest, O.DS feet. <br />The water level measurements at the specified surface water <br />sites can be obtained 6y installing a graduated staff in the <br />pond and detemining the index, elevation by leveling <br />procedures. A section of cloth or fiber glass engineer's <br />tape can be nailed to the staff for to provide the <br />graduations. <br />Sample filtration should be performed with paper suited far <br />finely crystalline precipitates (EPA specifies 45 micron <br />opening) such as Whatman No. 5 and using Buchner funnels and <br />1000 ml or larger filter flasks. The recommended filter size <br /> <br />-27- <br /> <br />