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• <br />Cotter Corporation PROCEDURE Number: 34 <br />Schwartzwalder Mine Page: 3 of 9 <br />Golden, Colorado WATER MONITORING Revision: 8 <br />Date: 08/01/2010 <br />2.2 General Surface Water Sample Collection Protocols <br />Overall sample collection volumes and preparation protocols required to meet the surface water Sampling <br />and Analysis Schedules detailed in Section 2.0 for each location are provided in the following tables. <br />S&A SCHEDULE CODE 1: STREAM WATER <br />SAMPLE COLLECTION & PREPARATION <br />Minimum Sample <br />Volume per Station Sample <br />Preparation <br />0.5 Liter Filtered I HN03" I ICE <br />Acidify to pH 2 <br />S&A SCHEDULE CODE 3: STREAM WATER <br />SAMPLE COLLECTION & PREPARATION <br />Minimum Sample <br />Volume per Station Sample <br />Preparation <br />3 Liters Filtered / HN03" / ICE <br />2 Liters Unfiltered/ HN03' / ICE <br />Acidify to pH 2 <br />TABLE 1 EXTENDED SUITE: STREAM WATER <br />SAMPLE COLLECTION & PREPARATION <br />Minimum Sample <br />Volume per Station Sample <br />Preparation <br />1 Gallon Filtered / HN03* / ICE <br />1 Liter Filtered / ICE <br />1.25 Gallons Unfiltered / HN03" / ICE <br />1 Gallon Unfiltered / ICE <br />1 Liter Unfiltered / 1-12SO; ! ICE <br />0.5 Liter Unfiltered / NaOH- / ICE <br />Acidify to pH 2 <br />Add base to pH 12 <br />2.3 SPECIFIC SURFACE WATER SAMPLING PROCEDURES <br />• 2.3.1 Sampling Procedure <br />Each surface stream water sample is collected using a stainless steel pail, or equivalent. Before collecting <br />each sample, the pail and sample container are rinsed out three times with the stream water at the <br />sampling location. The pail need not be cleaned prior to each separate stream location on any given day, <br />when the samples are collected from upstream to downstream. Samples are collected by dipping the pail <br />into the stream and transferring the required volume(s) into the sample container(s). <br />2.3.2 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). All samples are filtered through a 0.45 <br />micron (urn) membrane filter of the following diameters: <br />- Plate filter assembly: 102mm <br />- Bottle-top filter: 47mm <br />2.3.2.1 Field Filtration Methods <br />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. <br />1) Assemble clean filter holder and filter, attach vacuum pump hose to filter holder, and place <br />on open vacuum flask.