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• <br />Cotter Corporation PROCEDURE Number: 34 <br />Schwartzwalder Mine Page: 8 of 9 <br />Golden, Colorado WATER MONITORING Revision: 8 <br />Date: 08/01/2010 <br />3.3.2.1 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 <br />stable 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 />3.3.2.2 Air Driven Bladder or Piston Pump <br />• <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 <br />of three to five casing volumes. <br />5) After purging, monitor and record the in-field parameters of the discharge until consistent <br />readings are 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 />3.3.2.3 Sample Filtration <br />See Section 2.3.2 <br />3.3.2.3.1 Field Filtration Methods <br />See Section 2.3.2.1. <br />3.3.2.3.2 On-Site Laboratory Filtration Methods <br />See Section 2.3.2.2 <br />3.3.2.4 Sample Preservation <br />Acidify all samples to pH < 2 with the indicated acid as specified in Section 3.2. For all filtered <br />• samples, acidification should be performed only after filtration.