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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Approximately 10 times the volume of water in the casing will be withdrawn if possible.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 />DIAMETERI.D. 44 VOLUME <br />(inches) (inches) Gal/linear ft. <br />2 1 2.067 1 0.17 <br />4 1 4.026 1 0.66 <br />