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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 Probe and <br /> Surface Sampler. The Interface Probe .is a hand held, battery <br /> operated device for measuring.denth 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 /> ;l all measurements will be taken form the north side of the <br /> wellhead. To assess potential infiltration of fine grained <br /> sediments, well death 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 /> f: (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 /> r � 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 moni,`ored <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 /> 4b <br /> r: <br /> Fag <br /> Ly/ <br /> ao <br />