2011-02-28_PERMIT FILE - C1991078A (4)

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2.05.6(3) • • One of five methods is used to determine the flow at surface water monitoring stations. The following methods are utilized; 1) V- Notch weir; 2) corrugated metal pipe culvert utilizing pipe size, and velocity of flow; 3) regular channel shape utilizing cross- sectional area and velocity of flow; 4) timing flow into a bucket of known volume and; 5) estimate of flow based upon experience. The following table shows the flow monitoring method used at the monitoring stations based upon the above monitoring method numbers 1 - 5. Active Monitorin4 Stations B-1 Upper Bramiers Draw B-2 Lower Bramiers Draw N-1 Upper Naturita Creek N-1A Upper Naturita Creek N-2 Lower Naturita Creek H-2 Lower Broad Creek S-1 Section 33 Creek R-1 Reed Chatfield Ditch SP-1 - SP-6 - All Springs Inactive Monitorino Stations H-1 Upper C-1 Upper C-2 Lower L-1 Upper L-2 Lower W-1 Upper W-2 Lower Broad Creek Center Creek Center Creek Long Draw Long Draw Wickson Draw Wickson Draw Flow Monitorin4 Method 3 - Regular Channel 2 - Culvert 3 - Regular Channel 3 - Regular Channel 3 -Regular Channel 3 - Regular Channel 3 - Regular Channel 5 - Flow Estimate 4 - Bucket Flow Monitorino Method 3 - Regular Channel 2 - Culvert 1 - Weir 1 - Weir 1 - weir 3 - Regular Channel 1 - Weir Surface and underground water samples are collected in bottles supplied by the testing laboratory. Each water sample consists of three bottles, one unpreserved liter bottle and two 250 milliliter bottles, one preserved with nitric acid and one preserved with sulfuric acid. The bottles are shipped from the field to the testing laboratory in an ice filled cooler. Water samples from the bedrock wells and the alluvial wells are taken after the wells have been purged. At least three well volumes are evacuated in order to purge the wells in accordance with the following table: Well diameter: Gallons/lineal foot of water in well 3/4" 1" 1-1/2" 0.023 0.04 0.09 2.05-35a 2" 4" 6" 0.16 0.65 1.47 April 1993