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Title: GCC Rio Grande Pueblo Plant Groundwater Control Number: Revision Date: Page 2 of 6 <br /> Monitoring Well Compliance Sampling PUE.EN.P.003.01 2/19/2020 <br /> • COC's,custody seals <br /> • Box or bag of disposable nitrite gloves <br /> • Hand sprayers—(1)with Liquinox solution, (1)with distilled water <br /> • Roll of paper towels <br /> • Graduated 3 to 5-gallon bucket <br /> 8.0 PROCEDURE <br /> 1) Prior to day of sampling, obtain necessary equipment and materials (listed below in <br /> following section)to sample groundwater monitoring wells per compliance requirements. <br /> 2) Calibrate YSI Pro 1030(or similar)water quality meter for pH and specific conductivity per <br /> manufacturer's instructions in office or lab setting prior to going to field. <br /> 3) Complete Workplace Examination,per PUE.SA.P.015,and review with crew. <br /> 4) Observe and document in official record (Groundwater Sampling Record) any unusual <br /> conditions at or near well,especially including potential signs of tampering such as unlocked <br /> wellhead,removed cap,damage,etc. Take photo(s)as needed. <br /> 5) Set up sampling station <br /> a) Place water level indicator(WLI)and bailer(still in sealed factory bag) beside well. <br /> b) Place graduated bucket for purge water collection&volume measurement nearby. <br /> c) Place cooler containing bags of ice, "GW-Compliance"sample bottle set(s), bag or box of <br /> disposable nitrile gloves, sealed new 0.45 µm filter(s), sealed new syringe(s), and bailer <br /> cord nearby. <br /> 6) Measure and record well water level and well head stick-up <br /> a) Unlock wellhead padlock. Remove wellhead cap or j-plug. <br /> b) Measure depth to water(DTW)with clean/decontaminated WLI to the hundredth of foot <br /> from top of casing. Record value on GW Sampling Record. <br /> c) Measure and record total depth of well(TD)with WLI from top of casing. <br /> d) Measure and record well head stick-up(SU)from ground surface to top of casing. <br /> e) Clean/decontaminate probe and tape with Liquinox detergent solution followed by <br /> distilled water rinse when done with use at this well. <br /> f) If no water is present in well when measured,or water level is found to be within 0.25 <br /> feet of well TD(the distance between the lowest screen slot and well bottom cap),this <br /> monitoring event shall be designated"dry"on the Groundwater Monitoring Record. No <br /> collection of water quality field parameters or a sample for lab analysis is possible. <br /> Retrieve and decontaminate WLI, secure wellhead and rig down all monitoring <br /> equipment. <br /> 7) Calculate three-wellbore volume purge <br /> a) Calculate water column height as TD—DTW=WC,where <br /> TD is total depth (ft) measured from top of casing(TOC) <br /> DTW is depth to water(ft)measured from top of casing(TOC) <br /> WC is water column (ft) <br />