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Title: Sampling and Analysis Plan for Environmental Control Number: Revision Date: page 26 of 30 Groundwater Monitoring PUE.EN.D.026.04 2/19/2020 Title: GCC Rio Grande Pueblo Plant Groundwater Control Number: Revision Date: page 2 of 4 Monitoring Well Compliance Sampling PUE.EN.P.003.01 2/18/2020 8) Bail well S measure water quality parameters a) With clean disposable nitrile gloves,tear the bailer plastic bag open at the bail end(top)to expose only the bailer cord tie-off location. b) Securely tie bailer cord to bailer and remove bailer from bag, taking care to not touch the bailer to anything prior to inserting it into the well. c) Lower bailer into well at a rate that is manageable to keep bailer cord from tangling until it reaches the well water level. Allow the bailer to fill by submerging under its own weight at least the length of the bailer or otherwise until the bailer stops at the bottom of the well in the case of a short WC. d) Retrieve the bailer by pulling/winding the cord, taking care to not allow the cord to touch any potentially contaminating surfaces.When bailer is at surface it should be full of water, or at least to the level it was submerged. If not, the check valve ball may have not seated properly due to debris. Inspect and rinse with distilled water as necessary. Replace bailer as necessary. e) Dump bailer water from top of bailer to graduated bucket. The approximate full volume of a 1.25"X 36"bailer is 0.2 gallons. f) Lower bailer back into well and allow it to submerge completely to fully fill. g) Repeat steps 7c through 7e to purge well towards target production of 3 WBV. h) Collect purge water for water quality field parameter measurement with the calibrated multi- parameter water quality meter: temperature (T), pH, specific conductance (SC), after at minimum each 20%towards the total 3 WBV target production. For example, if the 3 WBV is 15 gallons,WQ parameter readings should be recorded at approximately 3, 6, 9, 12,and 15 gallons. Record each of these purge WQ measurements on the GW Sampling Record. At these times also measure and record DTW. i) Monitor the individual water quality field parameters for stabilization over 3 consecutive measurements according to the following: Temperature(10%) Specific Conductance(10%) pH(±0.2 unit) No more than 5 well volumes need to be removed prior to sample collection in the event of failure to reach stabilization criteria. 9) If well goes dry before field parameter stabilization or 5 WBV,recap and secure well and allow well to recover for up to 24 hours. Monitor DTW for adequate recovery. If recovered within 24 hours(same or next day),no further purging is required so move to step 10 below. If the well does not recover within 24 hours,this monitoring event shall be designated "dry following purge" on the Groundwater Monitoring Record. No collection of a sample for lab analysis is possible, however the field water quality parameters collected during the purge shall be retained on the Groundwater Monitoring Record. Retrieve and decontaminate WLI,secure wellhead and rig down all monitoring equipment. 10)Collect final field parameters and sample a) When stabilization criteria are met or 5 WBV have been purged, log one sample for all default parameters on the multi-parameter water quality meter naming the log for the appropriate monitoring well ID (i.e. MW-6). Download and email the export data file at completion of daily sampling activities to: Diana Furman— `!rmanna occ cnm b) There are 3 individual bottles in the "GW-Compliance" bottle set to be filled. Label all sample bottles by completing labels with indelible ink pen or marker prior to filling.