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• <br />Cotter Corporation PROCEDURE Number: 3-4 <br />Schwartzwalder Mine Page: 2 of 7 <br />Golden, Colorado WATER MONITORING Revision: 7 <br />Date: 04/15/2010 <br />The pump and tubing (or bailer, or other non-dedicated sampling equipment) will be decontaminated <br />prior to sample collection. After purging, a sample will be pumped directly into the sample bottle(s). <br />Field measurement will be carried out during the sampling, by filling a 250 mL beaker and measuring ph <br />and conductivity with a pH/Conductivity meter. Samples will be labeled, stored on ice and shipped <br />directly to laboratories on the day of sample collection. A thorough rinse with deionized water is sufficient <br />for decontamination between sample locations, provided the rinsate water meets the criteria of <50 <br />µS/cm. <br />2.3.3 Sample Collection Method(s) - <br />PVC Bailer <br />1) At well head, measure and record static water level. <br />2) Calculate volume of water in well casing. <br />3) Purge well by bailing a minimum of three well casing volumes. <br />4) Measure and record in-field parameters after the third and each additional casing volume until stable <br />readings are obtained. <br />5) Draw requisite sample volume; filter & acidify (see In-Field Filtration, Sections 2.4.2 & 2.4.3). <br />6) Clean equipment and proceed to next location. <br />Air Driven Bladder or Piston Pump <br />1) At well head, measure and record static water level. <br />2) Calculate volume of water in well casing. <br />• 3) Attach compressed-air supply line to well head from portable compressor/cycle control unit. Start <br />compressor and set controller to desired pumping cycle (see operating instructions for portable <br />compressor/cycle control unit on file at Environmental Department office). <br />4) Record pumping start time and determine pump rate using a bucket of known volume and a stop <br />watch. Calculate time period at this pump rate necessary to purge one casing volume. Purge well of three <br />to five casing volumes. <br />5) After purging, monitor and record the in-field parameters of the discharge until consistent readings are <br />obtained. <br />6) Draw requisite sample volume; filter & acidify (see In-Field Filtration, Sections 2.4.2 & 2.4.3). <br />7) Stop pumping, detach lines and clean equipment before moving to the next sample location. <br />2.4 Sample Filtration <br />All sample filtration equipment is to be cleaned with detergent and rinsed with deionized water prior to <br />initial use. For in-field filtration, a thorough rinse with deionized water is sufficient for decontamination <br />between sample locations. For on-site laboratory filtration, a thorough rinse with deionized water is <br />sufficient decontamination between samples if samples are being filtered in a sequence beginning with <br />the sample location with the lowest expected concentration (historical) and ending with the sample <br />location with the highest expected concentration (historical). <br />2.4.1 General Requirements (cont'd) <br />Acidify all samples with nitric acid (concentrated) to pH < 2, after filtration. All samples are filtered <br />through a 0.45 micron (urn) membrane filter of the following diameters: <br />- Plate fitter assembly: 102mm <br />- Bottle-top filter: 47mm <br />2.4.2 Field Filtration Methods <br />For the in-field filtration of samples one liter or less in volume <br />Equipment: Bottle-top filter holder; Vacuum flask of at least 250 mL capacity; Vacuum pump (hand-held <br />or power); 0.45 micron membrane filter 47mm in diameter.