Powder Mountain Aquifer Test and Monitoring Report for Summit Mountain Holding Group, Llc
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EXCHANGE APPLICATION E5382 (35-12848) POWDER MOUNTAIN AQUIFER TEST AND MONITORING REPORT FOR SUMMIT MOUNTAIN HOLDING GROUP, LLC Prepared by: Prepared for: Loughlin Water Associates, LLC Summit Mountain Holding Group, LLC 3100 W. Pinebrook Rd, Ste. 1100 Attn: Paul Strange, COO & General Council Park City, UT 84098 3632 North Wolf Creek Drive (435) 649-4005 Eden, Utah 84310 March 2015 Powder Mountain Aquifer Test and Monitoring Report – E8352 (35-12848) TABLE OF CONTENTS Section Page EXECUTIVE SUMMARY ........................................................................................................... 5 AQUIFER TESTING PLAN ........................................................................................................ 7 HYDROGEOLOGY .................................................................................................................... 8 MONITORING DATA AND EVALUATION ................................................................................. 9 Hidden Lake Well ................................................................................................................... 9 Aquifer Test Pumping ......................................................................................................... 9 Water Discharge During Aquifer Test .................................................................................10 Exploration Well 2 .................................................................................................................11 Precipitation and Snowpack ..................................................................................................12 Lefty Spring ...........................................................................................................................13 Lefty Stream ..........................................................................................................................15 Pizzel Spring #3 ....................................................................................................................16 Wellsville Middle Fork............................................................................................................17 Wellsville Creek Near North Boundary of Powder Mountain ..................................................18 Geertsen Creek (Bar B Flumes) ............................................................................................19 Other Protestant Monitoring Points .......................................................................................20 Water Chemistry and Stable Isotopes ...................................................................................20 UGS Data..............................................................................................................................21 CONCLUSIONS ........................................................................................................................21 REFERENCES .........................................................................................................................22 LIST OF TABLES 1 Monitoring Points for the Powder Mountain Aquifer Test 2 Hidden Lake Well Water Levels 3 Exploration Well 2 Water Levels 4 Climate Stations in Powder Mountain Region 5 Precipitation Comparisons 6 Daily Precipitation During Aquifer Test 7 Lefty Spring Weir - Manual Measurements for Discharge Rate 8 Lefty Stream Weir - Manual Measurements for Discharge Rate 9 Pizzel Spring #3 - Daily Flow Volumes at Pump House #1 10 Wellsville Middle Fork Weir - Manual Measurements for Discharge Rate 11 Wellsville Creek North Boundary Weir - Measurements for Discharge Rate Loughlin Water Associates LLC Page 2 of 24 March 27, 2014 Powder Mountain Aquifer Test and Monitoring Report – E8352 (35-12848) TABLE OF CONTENTS (CONTINUED) LIST OF FIGURES 1 Location Map 2 Vicinity Map 3 Geology Map 4 Stratigraphic Column 5 Geologic Cross Sections A, B, C, D 6 Hidden Lake Well - Daily Volume Pumped 7 Hidden Lake Well - Depth to Water 8 Exploration Well 2 - Depth to Water – 2013-2014 9 Exploration Well 2 - Depth to Water – July 2014-January 2015 10 Cumulative Precipitation for Water Year 11 Snow Water Equivalent for Water Year 12 Daily Precipitation 13 Lefty Spring - Transducer Pressure and Temperature 14 Lefty Spring - Protestant Data - Transducer Pressure and Temperature 15 Lefty Spring - Weir Water Levels 16 Lefty Spring - Estimated Discharge Rate 17 Lefty Stream - Transducer Pressure and Temperature 18 Lefty Stream - Protestant Data - Transducer Pressure and Temperature 19 Lefty Stream - Weir Water Levels 20 Lefty Stream - Estimated Discharge Rate 21 Pizzel Spring #3 - Average Daily Flow Rate 22 Pizzel Spring #3 and Pump House #2 - Average Daily Flow Rate 23 Wellsville Middle Fork - Transducer Pressure and Temperature 24 Wellsville Middle Fork - Weir Water Level 25 Wellsville Middle Fork - Estimated Discharge Rate 26 Wellsville Creek North Boundary Weir - Transducer Pressure and Temperature 27 Wellsville Creek North Boundary Weir - Weir Water Level 28 Wellsville Creek North Boundary Weir - Estimated Discharge Rate 29 Geertsen Creek (Bar B Flumes) – Stream Flow 30 Browning Well - Depth to Water 31 Highlands Well - Depth to Water 32 Burnett Spring - Average Daily Flow 33 Lower Wolf Creek - Depth of Water In Weir Loughlin Water Associates LLC Page 3 of 24 March 27, 2014 Powder Mountain Aquifer Test and Monitoring Report – E8352 (35-12848) TABLE OF CONTENTS (CONTINUED) LIST OF APPENDICES A Aquifer Test Plan and Other Selected Documents B Hidden Lake Well Pumping Data Sheets C Aquifer Hydraulic Analysis D Pump House #1 and #2 Data Sheets E Memorandum – Water Sampling and Water Chemistry Evaluation F UGS Water Quality Data We submitted data files to DWRi separately. File: Doc15-01-SMHG-Powder Mountain Aquifer Test Report.doc Loughlin Water Associates LLC Page 4 of 24 March 27, 2014 Powder Mountain Aquifer Test and Monitoring Report – E8352 (35-12848) EXECUTIVE SUMMARY This report provides our summary of the December 2014 Powder Mountain aquifer test, which involved pumping the Hidden Lake Well for 14 days and monitoring wells, springs and streams. The objective of the aquifer test was to determine interactions, if any, between the aquifer and spring and creek flows in Weber and Cache Counties by pumping the Hidden Lake Well. Loughlin Water Associates, LLC (Loughlin Water) prepared this report on behalf of Summit Mountain Holding Group (Summit Group). Figure 1 shows the location of Powder Mountain. Figure 2 shows the locations of monitored points near Powder Mountain (additional points monitored by protestant’s are located several miles to the south and are not shown on Figure 2). Table 1 summarizes points monitored for the Powder Mountain aquifer test. Protestants monitored additional locations, which we plot and briefly discuss. We performed the aquifer test during the seasonal base flow period when impacts, if any, would be most readily observable. Weather conditions were suitable and interpretable data were collected. The pumping rate of 150 gallons per minute (gpm) used for the 14-day Powder Mountain aquifer test is far greater (by at least 25 percent) than the continuous demand that will ever be placed on the Hidden Lake Well. The Utah Division of Drinking Water (DDW, 2014) allowed the well to be equipped with a pump capable of producing up to about 180 gpm. Although the equipped rate of 180 gpm will allow operational flexibility, the DDW (2014) limited the safe yield of the well to 120.7 gpm rate. Therefore the maximum peak day indoor demand of the Equivalent Residential Connections (ERCs) and outdoor irrigation that can be supplied by the well is 120.7 gpm. Average day indoor demand will be closer to 60 gpm. Conducting the 14-day aquifer test at a constant rate of 150 gpm allowed for careful quantitative analysis of the data and more accurate characterization of the aquifer. Previously, we used various analytical methods to estimate a transmissivity of about 500 square feet per day (ft2/day) from the 180-gpm, 24-hour pumping test of the Hidden Lake Well conducted in November 2013; see Loughlin Water (2013b and 2014a). By keeping the pumping rate constant, we were able to observe the delayed- yield response of the aquifer and revise our estimate of the transmissivity downward to about 120 ft2/day. The Utah Geological Survey (UGS, 2015a) also observed the delayed yield response and estimated a similarly low transmissivity of about 230 ft2/day. We present a series of graphs of water levels and flow rates of the various monitored locations along with graphs of well pumping, precipitation and temperatures. We overlaid and compared the graphs to look for impacts while accounting for effects of weather. Our evaluation of the Powder Mountain aquifer test monitoring data indicate no discernible impact due to pumping the Hidden Lake Well at Lefty Spring, Lefty Stream, Pizzel Spring #3, Wellsville Middle Fork, Wellsville Creek near the north boundary of Loughlin Water Associates LLC Page 5 of 24 March 27, 2014 Powder Mountain Aquifer Test and Monitoring Report – E8352 (35-12848) Powder Mountain, Geertsen Creek, or other locations monitored for this study. This is not surprising because many of the monitored locations are far from the pumping well and are isolated from impacts of pumping by the presence of low permeability formations. Lefty Spring and groundwater seeps and springs on the north side of Powder Mountain discharge from the same formation as the Hidden Lake Well. However, effects of pumping the well tend to be localized