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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 <br /> density difference <br /> between water and <br /> 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) <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 the volume of water in the casing will be withdrawn if 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 /> '2 2.067 0. 17 <br /> 4 4.026 0.66 <br />