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J1. <br />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 equipmentwill 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the volume of water in the casing will be withdrawn if 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 />