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Title: GCC Rio Grande Pueblo Plant Groundwater Control Number: Revision Date: page 3 of 6 <br /> Monitoring Well Compliance Sampling PUE.EN.P.003.01 2/19/2020 <br /> b) Calculate volume of WC as WC X 0.163= 1WBV,where <br /> WC is water column (ft) <br /> 0.163 is multiplier for gallons per foot(gal/ft)for a 2"schedule 40 well <br /> 1WBV is a single wellbore volume(gat) <br /> c) Calculate purge volume of prior to sampling as 1WBV X 3=3WBV,where <br /> 1WBV is a single wellbore volume(gal) <br /> 3WBV is three wellbore volumes(gal) <br /> d) Record calculated single and triple wellbore volumes on the GW Sampling Record. <br /> 8) Bail well&measure water quality parameters <br /> a) With clean disposable nitrile gloves,tear the bailer plastic bag open at the bail end (top) <br /> to expose only the bailer cord tie-off location. <br /> b) Securely tie bailer cord to bailer and remove bailer from bag,taking care to not touch the <br /> bailer to anything prior to inserting it into the well. <br /> c) Lower bailer into well at a rate that is manageable to keep bailer cord from tangling until <br /> it reaches the well water level. Allow the bailer to fill by submerging under its own weight <br /> at least the length of the bailer or otherwise until the bailer stops at the bottom of the <br /> well in the case of a short WC. <br /> d) Retrieve the bailer by pulling/winding the cord,taking care to not allow the cord to touch <br /> any potentially contaminating surfaces.When bailer is at surface it should be full of water, <br /> or at least to the level it was submerged. If not,the check valve ball may have not seated <br /> properly due to debris. Inspect and rinse with distilled water as necessary. Replace bailer <br /> as necessary. <br /> e) Dump bailer water from top of bailer to graduated bucket. The approximate full volume <br /> of a 1.25"X 36" bailer is 0.2 gallons. <br /> f) Lower bailer back into well and allow it to submerge completely to fully fill. <br /> g) Repeat steps 7c through 7e to purge well towards target production of 3 WBV. <br /> h) Collect purge water for water quality field parameter measurement with the calibrated <br /> multi-parameter water quality meter: temperature (T), pH, specific conductance (SC), <br /> after at minimum each 20%towards the total 3 WBV target production. For example, if <br /> the 3 WBV is 15 gallons,WQ parameter readings should be recorded at approximately 3, <br /> 6, 9, 12, and 15 gallons. Record each of these purge WQ measurements on the GW <br /> Sampling Record.At these times also measure and record DTW. <br /> i) Monitor the individual water quality field parameters for stabilization over 3 consecutive <br /> measurements according to the following: <br /> Temperature(10%) <br /> Specific Conductance(10%) <br /> pH (±0.2 unit) <br /> No more than 5 well volumes need to be removed prior to sample collection in the event <br /> of failure to reach stabilization criteria. <br />