2013-12-12_REVISION - M1990057

• Permit No: M1990057
• IBM Index Class Name: REVISION
• Doc Date: 12/12/2013
• Doc Name: Response to amendment review #2
• From: The Union Milling Company
• To: DRMS
• Type & Sequence: AM2
• Email Name: MAC
• Media Type: D
• Archive: No

The Leadville Mill Environmental Sampling Procedures
Water Sample Collection
Page 2 -15
2. Calculate the volume of water present in the well casing by multiplying the
linear feet of water by the volume per linear foot for the diameter of the well
as given in Table 2 -1.
TABLE 2 -1: WELL CASING CAPACITY
Inside Diameter (inch)
Gallons /Linear -Foot
2
0.16
4
0.65
6
1.47
8
2.61
Example:
Total Depth of Casing
100 ft
Depth to Water
20 ft
Linear Water Column
80 ft
2" casing
x 0.16
Water in casing
12.80 gallons
Alternately, use this formula to determine the gallons in any size pipe:
Volume = (3.1416 x r2 x hi„ch) /231
PHYSICAL-CHEMICAL PARAMETERS
In addition to the physical measurements taken above and other information that
may identify the well, the following physical- chemical information should be
recorded initially, during evacuation, and prior to sampling:
• pH
• Temperature
2.7.2 WELL PURGING & EVACUATION PROCEDURES
To obtain a representative sample of groundwater, the well should be purged or
evacuated to allow fresh or formation groundwater to enter the well. The optimum
or preferred method to ensure that fresh water representative of the aquifer in
contact with the well screen is being sampled is to perform a controlled sampling
experiment.
April 2013