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HYDRO27678
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Last modified
8/24/2016 8:47:06 PM
Creation date
11/20/2007 8:18:50 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1974015
IBM Index Class Name
Hydrology
Doc Name
AN ANALYSIS OF POSSIBLE GROUNDWATER & SURFACE WATER IMPACTS RESULTING FROM LYONS ROCKIN WP GRAVEL P
Media Type
D
Archive
No
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i <br />' low-yielding domestic wells, the permits for which allow pumping rates of 15 gallons per minute <br />' (gpm) or less. Well depths range from 9 to 60 feet; static water levels range from 4 to l:i feet below <br />the ground surface. Reported physical well yields range from one gpm to 22 gpm. There were not <br />' any high capacity (municipal or irrigation) wells identified in the vicinity of the mine. <br />' 4.2 Well Drilling and Pump Testing Program <br />1 <br /> <br /> <br />1 <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />1 ' <br />In order to estimate aquifer chazacteristics in the alluvial aquifer, a new pumping well, PZ-26-P W, <br />was constructed, located as shown in Figure 2. Following successful well construction, ashort-term <br />constant dischazge pumping test was performed on the well. The test data were analyzed to <br />determine aquifer characteristics including aquifer transmissivity, hydraulic conductivit`~ and storage <br />coefficient. In addition, data from one additional nearby pumping test were reviewed tmd analyzed <br />to determine aquifer characteristics. <br />The new pumping well, PZ-26-P W, was constructed on November 13, 1999 to a total depth of about <br />12 feet. The well was completed with perforated PVC well screen and a gravel pack as shown in <br />Appendix A. The alluvial aquifer at this location consisted of sand, gravel and cobbles, as indicated <br />on the drilling log presented in Appendix B. The water level in the well was about 2.3 feet below <br />ground surface following well completion; and the top of the aquifer was encountered at a depth of <br />about four feet, indicating semi-contined conditions at this location. Following well completion, the <br />well was developed with a surge block and bailer. The intent of the well constnuction was to <br />accommodate a pumping test during which water levels could be measured in the pumping well and <br />in a neazby observation well, PZ-26; the water level data from the observation well were analyzed <br />and used to estimate aquifer chazacteristics. The pumping well was drilled in acco:-dance with a <br />Notice to Construct Monitoring Wells submitted to the State Engineer's Office on November 8, <br />1999, as shown in Appendix C; a monitoring hole well permit application and a We'l Completion <br />and Test Report will be submitted to the State Engineer's Office within the 60-day time period <br />specified on the Notice. <br />lii,/a~-liinni/ ~i .I ruinan <. Au. <br />
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