2014-01-29_HYDROLOGY - P2009025 (8)

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Baseline Hydrologic Monitoring Plan — Hansen Project 50 Table 17. Domestic Water Supply Locations (Continued) Well or Spring ID Location Description DW Monitoring Status Domestic water supplies located 1/2 to 1 mile from expanded Taylor Ranch Project Boundary (continued) WP 63216 Waugh Mountain Properties O WP 63689 Cottonwood River Ranch O WP 64563 Cottonwood River Ranch O WP 65816 Cottonwood River Ranch A Domestic water supplies sampled, located more than I mile from Taylor Ranch Project Boundary WP 186385 Waugh Mountain Properties PD WP 214402 Autumn Creek Properties A Notes: A= Actively sampled P = Previously sampled O = Opted out of Domestic Water Monitoring Program D = Distant, across drainage divide, removed from Domestic Water Monitoring Program S = Stock well, removed from Domestic Water Monitoring Program - -- = Participation to be determined 5.1 Monitoring Frequency and Duration Water quality in domestic water supplies are currently monitored semiannually (17 wells) or annually (13 wells), depending on the preference or consent of the homeowner. As the permitting process moves forward, the domestic water monitoring program may be continued, and possibly modified based on proposed development activities and information obtained during the baseline monitoring phase. Such modifications could include changes to the list of analytes, such as eliminating constituents that have not been detected, or adding any new constituents of concern identified during geochemical testing. 5.2 Analytical Suite Field parameters for domestic water samples include temperature, pH, electrical conductivity, dissolved oxygen, and oxidation/reduction potential (ORP, or Eh) as shown in Table 18. Two laboratory analytical suites have been developed for domestic water samples. Domestic wells are initially monitored for the long analytical suite, then converted to a shortened analytical suite after one year of semi - annual monitoring. The initial analytical suite includes 48 laboratory parameters, while the reduced analytical suite includes 25 laboratory parameters (Table 19). The initial comprehensive domestic water analytical suite for the Project was developed based on Colorado agricultural groundwater standards and EPA drinking water standards. The suite was modified in 2010 to eliminate or reduce 18 parameters (Whetstone 2010a, 2010b) and those modifications were approved by Fremont County and their third -party hydrologic consultant (Western Water & Land). The analytical suite will be reviewed annually, and may be further modified to add or exclude constituents, as necessary, to meet the goals of the monitoring program. Table 18. Field Parameters for Domestic Water Supply Monitoring Parameter Precision/Units Temperature 0.1 °C pH 0.01 S.U. Electrical Conductivity 1 µmhos /cm Dissolved Oxygen 0.01 mg /L, 1% ORP 1 mV 4153A.140129 Whetstone Associates