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INERN <br /> 301 <br /> h• <br /> r• <br /> 1, <br /> Waterwork <br /> Groundwater Monitoring Protocol <br /> Monitoring depth to water and free product thickness within wells <br /> at the site will be conducted using an Interface Probebattery <br /> Surface Sampler. The Interface Probe is a hand held, <br /> ed device for measuring depth to petroleum product and <br /> depth to water as measured from an established datum (i.e., top <br /> of the well casing which has been surveyed). For consistency, <br /> all measurements will be taken from the north side of the <br /> wellhead at the survey mark. To assess potential infiltration of <br /> fine grained sediments, total well depth will also be sounded. <br /> a <br /> Product thickness is calculated by subtracting the t3agth to <br /> product from the depth to water. In addition, water elevations <br /> are adjusted for the presence of fuel with the following <br /> calculation: <br /> F� (Product Thickness) (.B)+(Water Elevation) <br /> F • a Corrected Water Elevation _ <br /> 1;19 - <br /> M� 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 /> f`' hours after development prior to free product inspection. <br /> r'a An acrylic Surface Sampler will be used for visual inspection of <br /> 4 the groundwater in order to note sheens (difficult to detect with <br /> the Interface Probe), odors, microbial action and sediments. The <br /> sampler is calibrated in inches and centimeters for visual <br /> inspection of product thickness. K <br /> �cI <br /> To reduce the potential for cross contamination betweenwells, + <br /> the monitorings will take place in order from the .laast to most <br /> contaminated. wells containing free product will be monitored <br /> last. Between each monitoring the equipment will sa washed with <br /> laboratory grade detergent and double rinsed with tap water, and a <br /> final rinsed with deionized water. <br /> Water data collected from the wells will be used to develop <br /> a groundwater equipotential contour map for the project site. <br /> ,:. Groundwater flow will be estimated to be perpendicular to <br /> equipotential contour lines drawn on the map. <br /> E � <br /> Bill 1 51. <br /> I <br />