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MON'TORING WELL SAMPLING PROTOCOL Sr <br /> HEMATIC <br /> t <br /> Sampling crew reviews project - <br /> Sampling requirements/schedule 4 <br /> Field decontamination and <br /> Instrumentation calibration <br /> i <br /> Check well integrity - { <br /> (inspect for Well Damage) <br /> Measure and record depth to water <br /> and total well depth <br /> (Electronic Well Sounder) <br /> Check for floating product <br /> (Oil/Water Interface Probe) <br /> Floating product present Floating product not present <br /> I <br /> Confirm product thickness Purge volume calculation I <br /> (Acrylic or PVC bailer) V=p(r/12)'h( %vol.)(7.48) = /gallons <br /> [h= <br /> Purge volume (gallons) <br /> Collect free product sample (as required) 3.14159 <br /> Height of Water Column (feet) <br /> Dissolved product sample Borehole radius (inches) <br /> Not required <br /> Evacuate water from well equal to the <br /> Record data on field data form calculated purge volume while monitoring <br /> groundwater parameters (pH, conductivity, <br /> temperature) at intervals of one casing <br /> volume. - <br /> Well dewaters after one purge Well readily recovers <br /> Volume llow yield well) <br /> Record groundwater stability indicator <br /> Well recharges to 80% of initial parameters from each additional purge <br /> measured water column height volume stability indicated when the <br /> within 24 hrs. of evacuation following criteria are met: <br /> pH: ±0.1 pH unit <br /> Measure groundwater stability Conductivity: ± 10% <br /> parameters (pH, Temperature: 1.0 degree F <br /> temperature, conductivity) <br /> Groundwater stability Groundwater stability <br /> Collect sample and complete Achieved not achieved <br /> Chain-of-Custody <br /> r Collect Sample and Continue purging until stability <br /> Preserve sample according to Complete Chain-of-Custody is achieved <br /> method <br /> Preserve Sample According Collect sample and complete.: <br /> Transport to analytical laboratory to required Chemical Analysis Chain-of-i Custody - <br /> i <br /> Transport to Analytical Laboratory Preserve sample according to <br /> method <br /> Transport to analytical laboratory <br />