January 22, Coronado National Forest 300 West Congress Street Tucson, AZ Jim Upchurch, Forest Supervisor. Dear Mr.

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1 January 22, 2015 Coronado National Forest 300 West Congress Street Tucson, AZ Attn: Jim Upchurch, Forest Supervisor Dear Mr. Upchurch: In your letter dated January 16, 2015, you requested that Hudbay share any additional information with you that you should have in preparation of the SBA or SIR. Late last week, I was able to share water quality and water level data that we continue to collect and today I have shared the link for Ranid ( ) and Bat ( ) survey reports for the years indicated. As you know, Rosemont installed two of the surface water monitoring locations in Davidson and Barrel Canyons on private property. Over the past two years, monthly reports have been produced for these monitoring systems. Hudbay will continue to monitor these locations and produce these reports. It appears that the most interesting and useful information that these stations provide at this time is associated with the annual rainfall and flow data measured at the stations. I have attached the December 2013 and December 2014 reports but can share any of the other information if your specialists believe the other information would be useful. As you can see from the 2014 report, one of the stations has a monitoring probe that may be failing and we believe there may be a maintenance issue with the Davidson Canyon wells. Please let me know if you have any questions or if you would like to see some of the other station reports. Sincerely, Katherine Ann Arnold, P.E. Director of Environment Attachment: Water and Earth Technology December Reports for Monitoring Stations in Davidson and Barrel Canyons December 2013 and December 2014 cc: Mindy Vogel, Coronado National Forest Melissa Polm, SWCA Doc. No. 007/ Arizona Business Unit 2450 W. Ruthrauff Road, Suite 180 P.O. Box Tucson, Arizona hudbayminerals.com Page 1 of 1

2 Analysis of Barrel Canyon and Davidson Canyon Instrumentation Data December 1, 2013 December 31, 2013 Prepared for Rosemont Copper Company 1/6/2014 This document describes the environmental monitoring data that were received from the Barrel Canyon and Davidson Canyon instrumentation stations. The purpose of this report is to provide a summary of data that were received and any QA/QC operations that were performed. Additional plots and reports can be developed upon request. However, detailed analysis of processes that drive changes in data values are beyond the scope of this task. Introduction During December 2012, Water and Earth Technologies, Inc. (WET) staff installed two combined groundwater and surface water instrumentation stations. One station is located in Barrel Canyon just upstream of the SR 83 Bridge and one station is located in Davidson Canyon downstream of the Davidson Dike, downstream of the confluence with Barrel Canyon. The Davidson Canyon station was activated on December 20, 2012 at 10:15am. The Barrel Canyon station was activated on December 21, 2012 at 2:26pm. Plots of all December 2013 raw data are presented in the Appendix of this report. USGS style precipitation and discharge reports are also provided in the Appendix. Year to date plots of cumulative precipitation, peak daily discharge and well elevations are also included in the Appendix. Items of Note or Concern There were two small precipitation events during December. No surface flow was measured and no ISCO sampling was triggered. These events are summarized in Table 1. On 12/19, the Novastar data receiving process was restarted. A short delay in data availability occurred, but no data were lost. This restart was related to a software update, not a satellite constellation connectivity issue. Table 1. December 2013 Hydrologic Event Summary Station Number of Number of Surfacewater Flow Events Sampling Events Number of ISCO Precipitation Events Barrel Canyon Davidson Canyon Data Analysis for December 2013 Page 1 of 20

3 Precipitation Two small precipitation events were measured at Barrel Canyon and Davidson Canyon during December These events occurred on 12/5 7/2013 (Barrel Canyon 0.24 inches and Davidson Canyon 0.28 inches) and 12/20 22/2013 (Barrel Canyon 0.32 inches and Davidson Canyon 0.32 inches). The monthly measured precipitation and the annual cumulative precipitation are presented below in Table 2. The 2013 monthly and annual totals for each station are presented in the precipitation reports at the end of the Appendix. The precipitation plot in the Appendix presents the annual cumulative precipitation. Table Annual Cumulative Precipitation Measured Station Precipitation Measured During December 2013 (inches) 2013 Annual Cumulative Precipitation as of December 31, 2013 (inches) Barrel Canyon Davidson Canyon Davidson Canyon precipitation not measured during 8/26/ :00 09/04/ :23:00. Data Analysis for December 2013 Page 2 of 20

4 Stream Flow No stream flow events or ISCO sampling events occurred during December The list of all 2013 events presented in Table 3 and Table 4. The days in 2013 where streamflow occurred in Barrel or Davidson Canyons is presented in Table 5. Table 3. Barrel Canyon Peak Stage and Peak Discharge for Storms During Date of Storm Barrel Canyon Peak Stage Barrel Canyon Rated Discharge (cfs) (feet) 7/16/ : (reported as 0.00) 7/20/ : /22/ : /23/ : /25/ : /08/ :15: /09/ :00: /09/ :15: /23/ :45: Measured by PT at sub surface location Table 4. Davidson Canyon Stage and Discharge for Storms During Date of Storm Davidson Canyon Peak Stage Davidson Canyon Rated Discharge (cfs) (feet) 8/24/ : /09/ :00: /09/ :00: Time of discharge indicated by ISCO trigger 2 Estimated by post storm high water mark measurement 3 Measured by the PT in the alternate location above the channel bed Data Analysis for December 2013 Page 3 of 20

5 Table 5. Days of Streamflow Occurrence During Station Barrel Canyon Davidson Canyon Days Where Streamflow In Channel Occurred at the Station Dates in 2013 Total Number of Days in /16/2013, 7/20/2013 7/21/2013, 08/22/ /01/2013, 23 09/08/ /14/2013, 11/23/ /24/2013 8/24/2013, 09/09/ During December, the stream PT at Barrel Canyon was located 1.66 feet below the stream bed. The two small precipitation events that occurred during December caused stream bed seepage and resulted in small increases in hydraulic head above the Barrel sub surface PT installation. No surface flow was measured. The Davidson Canyon stream PT was located at the alternate installation location 0.39 feet above the stream bed. The alternate installation location resulted in some noise in the Davidson Canyon PT stage data during the warm times of the year. During December, no noise was measured. The locations of the stream PTs are presented in Table 6. Table 6 also includes the minimum stage, as measured by the PT, where the lower float switch is activated triggering the ISCO sampler. Table 6. Location of Stream Pressure Transducers. Station Date Range Barrel Canyon 1 12/21/ /31/ /20/2012 9/3/2013 Davidson Canyon 2 9/4/ /31/2013 Stream PT location 1.66 feet below stream bed 1.63 feet below stream bed 0.39 feet above stream bed Minimum Stream Stage to Trigger ISCO Sampler by Lower Float Switch Approximate Stage as Stage Above Measured by PT Deepest Point in Channel feet 0.75 feet 2.33 feet 0.70 feet 0.31 feet 0.70 feet 1 The original installation location 2 Davidson Canyon Stream PT was placed in the above stream bed location on 9/4/ As measured during installation in December 2012 Data Analysis for December 2013 Page 4 of 20

6 Float Switches and ISCO Sampler No ISCO sampling events occurred during December. The ISCO sampling events for 2013 are presented in Table 7. Table 7. ISCO Sampling Events During Station ISCO Trigger Time Float Switch Trigger Times 8/22/ :48 Lower float switch 14:48, 15:02, 15:40 8/23/ :04 Lower float switch 23:04 Upper float switch 23:15. Barrel Canyon 09/08/ :09:00 (float switch stuck on until 09/17/ :49:00) Lower float switch 14:09, 14:22 Upper float switch 16:58:00 Davidson Canyon 8/24/2013 at 00:09 Lower float switch 00:09 09/09/ :38:00 Lower float switch 07:38 (float switch stuck on until 09/17/ :34:00) Data Analysis for December 2013 Page 5 of 20

7 Well Stage 15 minute data for Barrel Canyon alluvial and bedrock wells and Davidson Canyon alluvial and bedrock wells were received during December The two small precipitation events caused small increases in alluvial water level on 12/5 6/2013 and 12/20 21/2013 only at Barrel Canyon. Even with two small increases, the Barrel Canyon alluvial well showed an overall decrease of 0.39 feet during December. The Davidson Canyon alluvial well showed a steady increase of 0.47 feet over the month. The Barrel Canyon bedrock well showed a small, steady decrease of 0.14 feet over the month. The Davidson Canyon bedrock well showed a steady increase of 1.31 feet over the month. The current locations of the PTs for each well are presented in Table 8, below. Plots of raw PT data, water surface elevations and depth to groundwater are presented in the Appendix. Table 8. Location of PTs at Groundwater Wells as of December 31, 2013 Station Measurement Date PT location for Alluvial Well Depth below the channel bed (feet) Elevation (feet above mean sea level) Measurement Date PT location for Bedrock Well Depth below the channel bed (feet) Elevation (feet above mean sea level) Barrel Canyon 4/8/ /14/ Davidson Canyon 4/9/ /9/ Note: For depth below channel bed, scour or deposition can change the bed elevation at wells through time. Well Temperature Data for well temperatures, recorded at 15 minute intervals, were received for the alluvial and bedrock wells during the month. The precipitation events may have influenced the alluvial groundwater temperatures slightly. The Barrel alluvial well demonstrated non constant decreases during the month, with larger changes in temperature around 12/5 and 12/20, the times of the precipitations events. The Barrel Canyon alluvial well temperature decreased 5.5 degrees Fahrenheit (F) during December, from 65.1 degrees F to 59.6 degrees F. The Barrel Canyon bedrock well PT measured constant temperatures of 68.6 degrees F during December. The Davidson Canyon alluvial well temperature decreased 0.1 degrees F, from 70.0 degrees F to 69.9 degrees F. The Davidson Canyon bedrock well temperature decreased 2.4 degrees F, from 70.8 degrees F to 68.4 degrees F during December. Data Analysis for December 2013 Page 6 of 20

8 Soil Temperature The soil sensors are numbered 1 through 4, where sensor 1 is 1 foot below the channel bed surface. Sensor numbers increase with depth. Barrel Canyon sensors are located at 1 foot, 2 feet, 3 feet and 4 feet below the surface, Davidson Canyon sensors are located at 1 foot, 3 feet, 5 feet and 10 feet below the surface. 15 minute data for Barrel Canyon and Davidson Canyon soil temperature were received during the month. Near surface soil diurnal temperature fluctuations are seen in the data. Soil temperature decreases are associated with the two December precipitation events. Larger daily fluctuations and precipitation influences were observed at the surface and less influences at locations further down in the soil column. Soil Moisture 15 minute data for Barrel Canyon and Davidson Canyons soil moisture were received during the month. Small fluctuations in moisture throughout most days are seen in the data, as expected. Sensors, which are located in saturated soil display moisture of about 50%. The two December precipitation events did not greatly influence soil moisture at the two stations. At Barrel Canyon, a small increase in surface soil moisture occurred in the first part of December. For sensors further from the surface, nearly constant soil moisture occurred. At Davidson Canyon, the soil moisture at all levels remained nearly constant during the month. Soil Conductivity 15 minute data for Barrel Canyon and Davidson Canyon soil conductivity were received during the month. The soil conductivity data showed small fluctuations throughout most days; the two precipitation events did not greatly influence changes in soil conductivity. At Barrel Canyon and Davidson Canyon, soil conductivities showed no overall change during the month. Soil conductivities at different soil horizons remained nearly constant. Battery Voltage Hourly data for Barrel Canyon and Davidson Canyon battery voltage were received during the month. Sinusoidal changes in voltage seen because of changes in sun incidence angle on the solar panel. Some day to day variations caused by changes in cloud cover can be seen in the data. The range of voltage is maintained between 12.7 and 14.3 volts. Voltages greater than 11.2 volts will keep the station operating normally. These data show that the voltage regulators, batteries and solar panels are functioning properly. Data Analysis for December 2013 Page 7 of 20

9 Action Items Data will continue to be observed and QA/QC ed on a daily basis. The satellite data transmission delay issue will continue to be checked for daily Conclusion Both stations are operating well. All sensors are in place and functioning properly. Data Analysis for December 2013 Page 8 of 20

10 APPENDIX December 2013 Plots, Precipitation and Discharge Reports Data Analysis for December 2013 Page 9 of 20

11 Data Analysis for December 2013 Page 10 of 20

12 Data Analysis for December 2013 Page 11 of 20

13 Data Analysis for December 2013 Page 12 of 20

14 Data Analysis for December 2013 Page 13 of 20

15 Data Analysis for December 2013 Page 14 of 20

16 PRECIPITATION REPORT Station Number: Name: Barrel Canyon above SR83 Bridge LOCATION.-- Lat N Lon W DRAINAGE AREA.-- N/A DAILY TOTAL VALUES OF PRECIPITATION, IN INCHES, CALENDAR YEAR JANUARY 2013 TO DECEMBER 2013 DAY JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC TOTAL MAX MIN CAL YR 2013 TOTAL MAX 1.97 MIN 0.00 NOTE: EACH TABLE VALUE CALCULATED USING RAW DATA USING 5 DECIMAL PLACES PRECISION TOTALS USING PRECISION PRESENTED IN THE TABLE MAY NOT ADD CORRECTLY. Data Analysis for December 2013 Page 15 of 20

17 PRECIPITATION REPORT Station Number: Name: Davidson Canyon below Davidson Dike LOCATION.-- Lat N Lon W DRAINAGE AREA.-- N/A DAILY TOTAL VALUES OF PRECIPITATION, IN INCHES, CALENDAR YEAR JANUARY 2013 TO DECEMBER 2013 DAY JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC TOTAL MAX MIN CAL YR 2013 TOTAL MAX 1.73 MIN 0.00 NOTE: EACH TABLE VALUE CALCULATED USING RAW DATA USING 5 DECIMAL PLACES PRECISION TOTALS USING PRECISION PRESENTED IN THE TABLE MAY NOT ADD CORRECTLY. Data Analysis for December 2013 Page 16 of 20

18 DISCHARGE REPORT Station Number: Name: Barrel Canyon above SR83 Bridge LOCATION.-- Lat Long DRAINAGE AREA.-- N/A MEAN DAILY VALUES OF DISCHARGE, IN CFS, CALENDAR YEAR JANUARY 2013 TO DECEMBER 2013 DAY JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC MEAN MAX MIN CAL YR 2013 MEAN 0.03 MAX 4.25 MIN 0.00 INST MAX INST MAX TIME 09/09/ :15:00 Data Analysis for December 2013 Page 17 of 20

19 DISCHARGE REPORT Station Number: Name: Davidson Canyon below Davidson Dike LOCATION.-- Lat Long DRAINAGE AREA.-- N/A MEAN DAILY VALUES OF DISCHARGE, IN CFS, CALENDAR YEAR JANUARY 2013 TO DECEMBER 2013 DAY JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC MEAN MAX MIN CAL YR 2013 MEAN 0.03 MAX MIN 0.00 INST MAX INST MAX TIME 9/9/2013 6:00:00 PM Data Analysis for December 2013 Page 18 of 20

20 Annual Plots through December 31, 2013 Davidson Canyon station offline 8/26 9/4/2013, no data measured. Note: a flow event at Davidson Canyon on 8/24/2013 was indicated by the ISCO trigger, but not measured by the PT. Data Analysis for December 2013 Page 19 of 20

21 Barrel Bedrock PT removed for well testing 4/8 5/14/2013, no data measured. Davidson Canyon station offline 8/26 9/4/2013, no data measured. Davidson Canyon Bedrock Well pump test 11/4 11/13/2013, data flagged as maintenance and not plotted. Data Analysis for December 2013 Page 20 of 20

22 Analysis of Barrel Canyon and Davidson Canyon Instrumentation Data December 1, 2014 December 31, 2014 With Calendar Year 2014 Analysis Prepared for Rosemont Copper Company 1/22/2015 This document describes the environmental monitoring data that were received from the Barrel Canyon (BC 2) and Davidson Canyon (DC 3) instrumentation stations. The purpose of this report is to provide a summary of data that were received and any QA/QC operations that were performed. Additional graphs and reports can be developed upon request. However, detailed analysis of processes that drive changes in data values are beyond the scope of this task. Introduction During December 2012, Water and Earth Technologies, Inc. (WET) staff installed two combined groundwater and surface water instrumentation stations. One station is located in Barrel Canyon 0.28 miles upstream of the SR 83 Bridge and one station is located in Davidson Canyon downstream of the Davidson Dike, approximately 2.5 river miles downstream of the confluence with Barrel Canyon. The Davidson Canyon station was activated on December 20, 2012 at 10:15am. The Barrel Canyon station was activated on December 21, 2012 at 2:26pm. Graphs of all December 2014 raw data are presented in the Appendix of this report. Precipitation and stream discharge reports are also provided in the Appendix. Year to date graphs of cumulative precipitation, peak daily discharge, well elevations and soil conditions are also included in the Appendix. Items of Note or Concern Davidson Canyon soil sensor #4, installed 10 feet below the channel bed, may be failing. Data shifts were observed in moisture and conductivity on 10/10/2014. Very little change in the data was observed during December. The moisture and conductivity continue to be out of range; the temperature appears to be reporting accurately. Page 1 of 31

23 There were five (5) precipitation events, no streamflow events and no ISCO sampling events measured during December. These events are summarized in Table 1. Table 1. December 2014 Hydrologic Event Summary Station Number of Number of Surfacewater Flow Events Sampling Events Number of ISCO Precipitation Events Barrel Canyon Davidson Canyon There were no (0) satellite transmission no report alarm during December. There were no well pumping tests performed in December. Page 2 of 31

24 Precipitation There were five (5) precipitation events measured at each station during December. The monthly measured precipitation and the annual cumulative precipitation are presented below in Table 2 and Table 3. Comparison with 2013 measured total precipitation is also presented. The 2014 monthly and annual totals for each station are also presented in the precipitation reports at the end of the Appendix. The precipitation graph in the Appendix presents the annual cumulative precipitation. Table Annual Cumulative Precipitation Measured Station Precipitation Measured During December 2014 (inches) Measured 2014 Total Precipitation as of December 31, 2014 (inches) Comparison: Measured 2013 Total Precipitation (inches) Barrel Canyon Davidson Canyon Table Monthly Precipitation Measured Month Barrel Canyon (inches) Davidson Canyon (inches) January February March April May June July August September October November December Year To Date Each table value calculated using raw data with 5 decimal places precision. Totals using precision presented in the table may not add correctly. Page 3 of 31

25 Precipitation events with greater than 0.5 inches measured precipitation in 24 hours are of interest for the stormwater monitoring permit reporting. Days when this occurred during 2013 and 2014 is presented in Table 4. Plots of annual 24 hour rainfall total are also presented in the Appendix (2013 plots are included at the very end of the Appendix). Table and 2014 Days of Greater than 0.5 Inches of Measured Precipitation in 24 Hours Station Barrel Canyon 2013 End of storm dates for storms greater than 0.5 inches in 24 hours. 07/11/13 07/16/13 07/20/13 08/23/13 08/25/13 09/08/13 09/09/13 11/23/ End of storm dates for storms greater than 0.5 inches in 24 hours. 03/01/14 07/06/14 07/09/14 07/13/14 08/01/14 08/19/14 09/17/14 09/18/14 09/20/14 10/08/14 Davidson Canyon 8 days in /21/13 06/14/13 08/02/13 08/23/13 09/09/13 11/23/13 6 days in days in /01/14 07/05/14 08/01/14 09/08/14 09/12/14 09/17/14 09/20/14 09/21/14 10/08/14 9 days in 2014 Page 4 of 31

26 Stream Flow No (0) streamflow events were measured during December 2014 at the Barrel station and none (0) were measured at the Davidson station. No (0) ISCO sampling events occurred during December All 2014 events are presented in Table 5 and Table 6. The days in 2014 where streamflow occurred in Barrel or Davidson Canyons are presented in Table 7. The total annual volume of measured streamflow is presented in Table 8. Note that the discharge reports presented in the appendix show mean daily streamflow. The instantaneous maximums are included at the bottom of the reports. Table 5. Barrel Canyon Peak Stage and Peak Discharge for Storms during Date of Storm Barrel Canyon Measured Peak Stage (feet) Barrel Canyon Rated Peak Discharge (cfs) 3/1 2/ at 3/2 04: /6/ at 14: /7/ at 15: /9/ at 18: /13/ at 19: /14/ at 14: /27/ at 23: /01/ at 20: /15/ at 9: /16/ at 23: /19/ at19: /6/ at 13: /8/ at 13: /18/ at 0: /20/ at 11: Note: a change of rating for the gage after 9/20/2014 at 11:45 caused no surface flow to be estimated for 10/9/2014, previously indicated in October 2014 data analysis report to have surface flow. Also, this update DID NOT influence the calculation of the peak discharge on 9/20/2014. Table 6. Davidson Canyon Stage and Discharge for Storms during Date of Storm Davidson Canyon Measured Peak Stage (feet) Davidson Canyon Rated Peak Discharge (cfs) 7/9/ at 19: /28/ at 1: /1/ at 20: /19/ at 20: /8/ at 12: /12/ at 21: /20/ at 11: Page 5 of 31

27 Table 7. Days of Streamflow Occurrence during Days Where Streamflow In Channel Occurred at the Station 1 Station Dates in 2014 Total Number of Days in /1, 3/2, 7/6, 7/7, 7/9, 7/10, Barrel 7/13 7/19, 7/27 7/29, 8/1 8/5, Mar: 2, July: 14, Aug: 18, Sep: 13, Total: 47 Canyon 8/15 8/27, 9/6 9/10, 9/17 9/24 2 Davidson 7/9, 7/28, 8/1, 8/19, 9/8, 9/12, 9/20, Jul: 2, Aug: 2, Sep: 4, Total: 8 Canyon 9/21 1 Following runoff events, water often ponds near the Barrel station. This ponded water and/or saturated channel bed material is often measured as very low streamflow discharges. 2 A change of rating for the gage after 9/20/2014 at 11:45 caused no surface flow to be estimated for 10/8 10/2014, previously indicated in October 2014 data analysis report to have surface flow. Table 8. Total Volume of Measured Streamflow as of December 31, Station Total Volume of 2014 Measured Comparison: Total Volume of 2013 Measured Streamflow (AF) Streamflow (AF) Barrel Canyon 0.19 March July August September total July Davidson August Canyon September total 1 A change of rating for the gage after 9/20/2014 at 11:45 caused no surface flow to be estimated for 10/8 10/2014, previously indicated in October 2014 data analysis report to have surface flow. 2 Discharge during 8/24/2013 not measured by PT and not included in volume calculation. During December, the stream PT at Barrel Canyon was located 1.99 feet below the stream bed. Any PT measurement above 1.99 feet indicates surface flow in the channel. The Davidson Canyon stream PT was located at the alternate installation location 0.39 feet above the stream bed during December. The Davidson PT demonstrated some noise in the level data earlier in the summer. The PT data can be small positive values even when there is no stage above the PT. This noise in the data, caused by extreme temperature is more common during the warm times of the year and has recently reported values feet during warm summer conditions. To filter out the noise from the real surface flow, the rating for the Davidson Canyon stream PT is computing discharge when the PT stage is only greater than 0.07 ft. During the cooler month of December zero stage values of feet were reported. Table 9 below presents the stream PT locations and the minimum stage, as measured by the PT, where the lower float switch would be activated triggering the ISCO sampler. The monthly stream stage plots show the PT stage measurement for the location of the stream bed for the Barrel and the upper and lower float switch stage values at both stations. Page 6 of 31

28 Table 9. Location of Stream Pressure Transducers. Station Barrel Canyon Davidson Canyon Date Range 12/21/2012 9/20/2014 9/20/2014 present 12/20/2012 9/3/2013 9/4/2013 present 1 The original installation location 2 Location moved to the above stream installation on 9/4/ As measured during installation in December As measured during channel bed re survey in October 2014 Stream PT location 1.66 feet below stream bed feet below stream bed feet below stream bed feet above stream bed 2 Minimum Stream Stage to Trigger ISCO Sampler by Lower Float Switch Approximate Stage as Stage Above Measured by PT Deepest Point in Channel 2.41 feet 0.75 feet feet 0.42 feet feet 0.70 feet feet 0.70 feet 3 The peak discharge values at the Rosemont Barrel station were compared with the peak values measured at the USGS station in Barrel Canyon. The USGS gage BARREL CANYON NEAR SONOITA, AZ is 0.28 miles downstream of the Rosemont Barrel station, with no large intervening inflows or withdrawals. Discharge measurements between the two gages should be nearly equivalent (reach gain between the gages is probably small). Peak measured discharges could vary based on measurement times. Both gages report data with 15 minute resolution, so there is a possibility of missing the exact peak of a short runoff event. The surface runoff event observed in December at the Rosemont Barrel Canyon station was very small, but there was not report of discharge at the USGS station. The peak discharges at the USGS gage for the 2014 storms are presented in Table 10. Page 7 of 31

29 Table 10. Barrel Canyon Peak Discharges as measured by Rosemont and USGS gage Date and time of Storm Rosemont Barrel Canyon Station BC 2 Rated Peak Discharge (cfs) USGS Gage Peak Discharge (cfs) 3/2/ : /6/ : /7/ : /9/ : /13/ : /14/ : /27/ : /1/ : /15/2014 9: /19/ : /6/ : /20/ : Note: a change of rating for the Rosemont BC 2 gage after 9/20/2014 at 11:45 caused no surface flow to be estimated for 10/9/2014, previously indicated to have a small surface flow. There are differences between the USGS peak values and the Rosemont gage peak values. Both the USGS gage and the Rosemont gage use stage discharge relationships to estimate discharge as a function of measured stage. The discharge values at the Rosemont gage are computed through the hydraulic stage discharge rating, which is based on the physical survey of the channel at the time of installation on 12/2012 and hydraulic modeling in HEC RAS. Based on observations, the channel shape has changed slightly since 12/2012 due to storm scour and sediment deposition. It is possible that the stage discharge relationship in the channel has changed slightly since installation. The location of the USGS gage at the concrete bridge opening with an apron may provide a better rated cross section, because the cross section is less likely to change (although sedimentation can occur on top of the concrete apron) and the concrete provides a uniform bed slope. Measured hydrographs from the Rosemont station at Barrel and the USGS Barrel station have been compared as part of the rating adjustment. Many events are characterized nearly identically between the two gages. However for some events, there are some differences in flow magnitude, which vary from event to event with no overall bias. In general, the timing of the start of events and magnitude and duration of events compare well between the two gages. More detailed comparison of discharge hydrographs and total volume of discharge will be performed as part of the 401 surface flow modeling. Given the nature of the wash and the infrequency of events, discharge measurements with a flowmeter are very difficult. Discharge measurements, in available, are useful to ground truth hydraulic ratings. The USGS has not performed a manual discharge measurement at this gage since 9/11/2012, see Page 8 of 31

30 Float Switches and ISCO Sampler No (0) ISCO sampling events occurred during December. The ISCO sampling events for 2014 are presented in Table 11. Table 11. ISCO Sampling Events during Station ISCO Trigger Time Float Switch Trigger Times Barrel Canyon 7/6/ :33 14:45 7/7/ :09 16:30 7/13/ :16 19:30 7/27/ :34 7/28/ :22 8/1/ :36 8/2/2014 7:36 8/19/ :36 8/20/ :01 9/6/ :20 9/8/ :38 9/20/ :41 9/23/ :05 1 7/6/ :33 14:45 1 7/7/ :09 16:30 2 7/13/ :16 19:30 1,2 7/27/ :34 7/28/ :22 2 8/1/ :36 8/2/2014 7:36 2 8/19/ :36 8/20/ :01 1 9/6/ :20 9/8/ :38 1 9/20/ :41 9/23/ :05 2 9/20/ :02 9/23/ :00 Davidson Canyon 7/28/ :59 01:08 8/1/ :00 8/2/2014 8:45 8/19/ :42 8/20/ :30 9/8/ :22 14:30 9/12/ :26 21:30 9/20/ :42 9/23/ :17 1 7/28/ :59 01:08 1 8/1/ :00 8/2/2014 8:45 2 8/1/ :00 8/1/ :05 1,2 8/19/ :42 8/20/ :30 2 9/8/ :22 14:30 1 9/12/ :26 21:30 1 9/20/ :42 9/23/ :17 2 9/20/ :49 11:00 Well Stage 15 minute data for groundwater levels in the Barrel Canyon alluvial and bedrock wells and Davidson Canyon alluvial and bedrock wells were received during December There were five (5) precipitation events measured during the month, although these did not directly influence groundwater levels. No pump tests (or pumped well sampling) occurred during this month. Groundwater levels in the Barrel Canyon alluvial well showed a decrease of 0.40 feet during the month. The groundwater levels in the Davidson Canyon alluvial well showed a small increase of 0.24 feet over the month. The Barrel Canyon bedrock well PT continued to show nearly constant level during the month, but with varying degrees of diurnal fluctuations in water level, with daily variations ranging up to 0.12 feet recorded during the month. Groundwater levels in the Barrel Canyon bedrock well showed a small decrease of 0.15 feet during the month. Groundwater levels in the Davidson Canyon bedrock well showed an increase of 0.63 feet over the month. Page 9 of 31

31 The current locations of the PTs for each well are presented in Table 12, below. Graphs of raw PT data, water surface elevations and depth to groundwater are presented in the Appendix. Table 12. Location of PTs at Groundwater Wells as of December 31, 2014 Station PT location for Alluvial Well Depth Elevation below (feet Measurement the above Date channel mean bed sea level) (feet) Change in elevation (feet above mean sea level) PT location for Bedrock Well Depth Elevation below (feet Measurement the above Date channel mean bed sea (feet) level) Change in elevation (feet above mean sea level) Barrel Canyon 4/8/ /14/ Davidson Canyon 4/9/ /9/ Barrel Canyon 5/14/ /14/ Davidson Canyon 5/14/ /14/ Note: For depth below channel bed, scour or deposition can change the bed elevation at wells through time. Due to movement of well casings, the casing or PVC top elevations may change over time. Exact PT elevation inside the wells can change slightly due to removal and re installation during maintenance, well pumping or sampling. Well Temperature Data for well temperatures, recorded at 15 minute intervals, were received for the alluvial and bedrock wells during the month. There were five (5) precipitation events measured during December, these did not appear to directly influence well temperatures. The Barrel Canyon alluvial well temperature decreased 4.4 degrees F during December, from 66.4 degrees F to 62.0 degrees F. The Barrel Canyon bedrock well PT measured constant temperatures of 68.6 degrees F during December. The Davidson Canyon alluvial well temperature decreased 0.1 degrees F, from 70.7 degrees F to 70.6 degrees F. The Davidson Canyon bedrock well temperature decreased 2.1 degrees F from 70.8 degrees F to 68.7 degrees F during December. Page 10 of 31

32 Soil Temperature The soil sensors are numbered 1 through 4, where sensor 1 is 1 foot below the channel bed surface. Sensor numbers increase with depth. Barrel Canyon sensors are located at 1 foot, 2 feet, 3 feet and 4 feet below the surface, Davidson Canyon sensors are located at 1 foot, 3 feet, 5 feet and 10 feet below the surface. 15 minute data for Barrel Canyon and Davidson Canyon soil temperature were received during the month. Near surface soil diurnal temperature fluctuations are seen in the data. Temperatures in deeper soil horizons fluctuated less. The influence of changing weather and small precipitation events on soil temperatures are evident; only small, steady soil temperature decreases are seen with small changes in the diurnal signal of temperature during the month. Soil Moisture 15 minute data for Barrel Canyon and Davidson Canyons soil moisture were received during the month. Small fluctuations in moisture throughout most days are seen in the data, as expected. Sensors, which are located in saturated soil display moisture of about 50%. Most sensors showed constant, near saturation values. The small precipitation events during December did not impact soil moisture much. Davidson Canyon Soil sensor 4 may be showing signs of failure. This sensor, located 10 feet below the surface was installed in saturated soil and has recorded at or near saturation conditions since that day. On 10/10 at 13:30, data for soil moisture and conductivity shifted dramatically. Temperature appeared to be un altered. Soil moisture changed from 55% to 218% (out of the realistic range). This sensor has continued to return out of range values during December. Even with raw data out of realistic bounds, this sensor has reported small changes in moisture during the month. A constant could be added to the raw data value at the base station. This shift adjustment would remove this erroneous step change from the resulting data. Page 11 of 31

33 Soil Conductivity 15 minute data for Barrel Canyon and Davidson Canyon soil conductivity were received during the month. In general, the soil conductivity data showed small fluctuations throughout most days. Following the moisture response, most sensors showed constant values during the month. The small precipitation events during December did not impact soil conductivity much. Davidson Canyon Soil sensor 4 may be showing signs of failure. This sensor, located 10 feet below the surface was installed in saturated soil. On 10/10 at 13:30, data for soil moisture and conductivity shifted dramatically. Temperature appeared to be un altered. Soil water conductivity changed from S/cm to 0.18 S/cm (out of the realistic range). Even with raw data out of realistic bounds, this sensor has reported small changes in conductivity during the month. A constant could be added to the raw data value at the base station. This shift adjustment would remove this erroneous step change from the resulting data. Battery Voltage Hourly data for Barrel Canyon and Davidson Canyon battery voltage were received during the month. Sinusoidal changes in voltage seen because of changes in sun incidence angle on the solar panel. Some day to day variations caused by changes in cloud cover can be seen in the data. The range of voltage was maintained between 12.7 and 14.5 volts during the month. Voltages greater than 11.2 volts will keep the station operating normally. These data show that the voltage regulators, batteries and solar panels are functioning properly. Action Items Data will continue to be observed and QA/QC ed on a daily basis. The satellite data transmission delay issue will continue to be checked for daily. The soil sensors can not be re calibrated nor serviced in the field. If Davidson Canyon soil sensor 4 is in fact failing, it cannot be repaired. Another sensor could be installed, but because of the nature of the layered soil pit installation, the installation of remaining soil sensors would be disrupted. Conclusion With the exception of Davidson Canyon soil sensor 4, both stations are operating well. All sensors are in place and functioning properly. Page 12 of 31

34 APPENDIX December 2014 Graphs valid data only plotted Precipitation Page 13 of 31

35 Barrel Stage, Discharge and ISCO Sampling Triggers Page 14 of 31

36 Davidson Stage, Discharge and ISCO Sampling Triggers Page 15 of 31

37 Groundwater Level, Elevation and Temperature Page 16 of 31

38 Individual Stations Groundwater Level Page 17 of 31

39 Soil Temperature Page 18 of 31

40 Soil Moisture Davidson Canyon Soil Sensor 4 is showing signs of failure. Value is out of range and not plotted. Page 19 of 31

41 Soil Conductivity Davidson Canyon Soil Sensor 4 is showing signs of failure. Value is out of range and not plotted. Battery Voltage Page 20 of 31

42 Precipitation and Discharge Reports PRECIPITATION REPORT Station Number: Name: Barrel Canyon above SR83 Bridge LOCATION.-- Lat N Lon W DRAINAGE AREA Sq. Miles DAILY TOTAL VALUES OF PRECIPITATION, IN INCHES, CALENDAR YEAR JANUARY 2014 TO DECEMBER 2014 DAY JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC TOTAL MAX MIN CAL YR 2015 TOTAL MAX 1.22 MIN 0.00 NOTE: EACH TABLE VALUE CALCULATED USING RAW DATA USING 5 DECIMAL PLACES PRECISION TOTALS USING PRECISION PRESENTED IN THE TABLE MAY NOT ADD CORRECTLY. Page 21 of 31

43 PRECIPITATION REPORT Station Number: Name: Davidson Canyon below Davidson Dike LOCATION.-- Lat N Lon W DRAINAGE AREA Sq. Miles DAILY TOTAL VALUES OF PRECIPITATION, IN INCHES, CALENDAR YEAR JANUARY 2014 TO DECEMBER 2014 DAY JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC TOTAL MAX MIN CAL YR 2014 TOTAL MAX 1.49 MIN 0.00 NOTE: EACH TABLE VALUE CALCULATED USING RAW DATA USING 5 DECIMAL PLACES PRECISION TOTALS USING PRECISION PRESENTED IN THE TABLE MAY NOT ADD CORRECTLY. Page 22 of 31