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Water Work <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 Probe and <br /> Surface Sampler . The Interface Probe is a hand held, battery <br /> operated 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 form the north side of the <br /> wellhead . To assess potential infiltration of fine grained <br /> sediments, well depth will be sounded using the interface probe . <br /> Product thickness is calculated by subtracting the depth 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 /> (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 /> An acrylic Surface Sampler shall be used for visual inspection of <br /> the groundwater to note sheens (difficult to detect with the <br /> Interface Probe ) , odors, microbial action and sediments . The <br /> sampler is calibrated in inches and centimeters for visual <br /> inspection of product thickness . <br /> To reduce the potential for cross contamination between wells, <br /> the monitorings will take place in order from the least to most <br /> contaminated. Wells containing free product will be monitored <br /> last . Between each monitoring the equipment will be washed with <br /> laboratory grade detergent and double rinsed with tap water, and <br /> final rinsed with deionized water . <br />