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MR <br /> STANDARD OPERATING PROCEDURES <br /> FOR <br /> GROUNDWATER SAMPLING <br /> 1. OBJECTIVE <br /> Collect representative groundwater level data and groundwater samples. <br /> 2. BACKGROUND <br /> Field work proceeded from the monitoring wells with the lowest to highest concentrations of <br /> constituents (determined from previous analytical data). Water levels were measured to <br /> determine the direction and gradient of groundwater flow. Representative groundwater <br /> samples from the water-bearing zone were obtained using new disposable polyethylene <br /> bailers following purging. <br /> 3. PERSONNEL REQUIRED AND RESPONSIBILITIES <br /> Field Staff: A qualified GHD project geologist, staff geologist, or field technician performed the <br /> quarterly monitoring and sampling activities in accordance with the procedures outlined below. <br /> 4. PROCEDURES <br /> 4.1 Decontamination Procedures <br /> • The wash and rinse buckets, electronic submersible pump, and the water level meter <br /> were decontaminated using Alconox or Liquinox soap and potable water. <br /> • The pump and water level meter were decontaminated following use in each well. <br /> • Nitrile gloves were worn by the sampler at all times and changed after handling <br /> equipment and instruments. <br /> 4.2 Calibration Procedures <br /> • The Ultrameter was calibrated for conductivity and pH prior to use. Temperature <br /> calibration is not necessary in the Ultrameter. <br /> • Conductivity was calibrated using KCI-7000 standard solution within its expiration date. <br /> • The calibration for pH included "zeroing" the Ultrameter meter with a pH 7.00 buffer <br /> solution followed by adjusting the gain with acid and base buffers (4.00 and 10.00). <br /> 4.3 Dissolved Oxygen (DO) Concentrations <br /> • The membrane on the YSI Model 550A DO meter was checked for the presence of <br /> bubbles and wrinkles, neither of which was observed. <br /> • The meter was calibrated in the field prior to collecting measurements. <br /> • Using the calibrated YSI Model 550A DO meter, DO concentrations were measured in <br /> each monitoring well prior to purging and sampling activities. <br /> GHD SOP GW Sampling 1 of 3 Rev 2/14 <br />