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t <br /> Quality Assurance/Quality Control Plan Page 7 <br /> An acrylic Surface Sampler will be used for visual inspection of the groundwater in order to note <br /> sheens (difficult to detect with the Interface Probe), odors, microbial action and sediments. The <br /> sampler is calibrated in inches and centimeters for visual inspection of product thickness. <br /> To reduce the potential for cross contamination between wells, the monitorings will take place <br /> in order from the least to most contaminated, if known. Well containing free product will be <br /> monitored last. Between each well monitoring the equipment will be decontaminated <br /> Water level data collected from the wells will be used to develop a groundwater contour map <br /> for the project site. Groundwater flow will be estimated to be perpendicular to equipotential <br /> lines drawn on the map. <br /> 10.0 WELL DEVELOPMENT PROTOCOL <br /> Groundwater monitoring wells will be surged and developed prior to setting the surface seal. <br /> Approximately 10 times the volume of water in the casing will be withdrawn if possible. Casing <br /> volumes will be calculated in the following manner: <br /> VOLUME OF SCHEDULE 40 PVC PIPE': <br /> DIAMETER I.D. VOL1.UME <br /> (inches) (inches) Gal/linear,ft. <br /> 2 2.067 0.17 <br /> 4 4.026 0.66 <br />