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Product thickness is calculated by subtracting the depth to <br /> product from the depth to water. In addition, water <br /> elevations are adjusted for the presence of fuel with the <br /> following calculation: <br /> (Product Thickness) ( .8)+(Water Elevation) <br /> = Corrected Water Elevation <br /> Note: The factor of 0.8 accounts for the density difference <br /> between water and petroleum hydrocarbons. <br /> Newly installed wells will be allowed to stabilize for 24 <br /> hours after development prior to free product inspection. <br /> • An acrylic Surface Sampler will be used for visual <br /> inspection of the groundwater in order to note sheens <br /> (difficult to detect with the Interface Probe) , odors, <br /> microbial action and sediments. The sampler is calibrated <br /> in inches and centimeters for visual inspection of product <br /> thickness. <br /> To reduce the potential for cross contamination between <br /> wells, the monitorings will take place in order from the <br /> least to most contaminated, if known. Wells containing free <br /> product will be monitored last. Between each well <br /> monitoring the equipment will be decontaminated. <br /> Water level data collected from the wells will be used to <br /> develop a groundwater contour map for the project site. <br /> Groundwater flow will be estimated to be perpendicular to <br /> equipotential lines drawn on the map. <br /> 10.0 Well Development Protocol <br /> Groundwater monitoring wells will be surged and developed <br /> prior to setting the surface seal. Approximately 10 times <br /> the volume of water in the casing will be withdrawn if <br /> possible. Casing volumes will be calculated in the <br /> following manner: <br /> Volume of Schedule 40 PVC Pipe <br /> Diameter I.D. Volume <br /> .(inches) ( inches) Gal/linear ft. <br /> ------------------------------------------ <br /> 2 2.067 0.17 <br /> 4 4.026 0.66 <br />