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f <br /> WaterWork <br /> GroyndwaterKqqlto—r—l-nas P otocol <br /> F-4 <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 me4isuring 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, water17 elevations <br /> are adjusted for the presence of fuel with the following <br /> calculation: <br /> (Product Thickness) ( .8)+(Water Elevation) <br /> h = Corrected Water Elevation <br /> Note: The factor of 0.8 accounts for the density difference <br /> bejtween water and petroleum hydrocarbons. <br /> Ai3 acrylic surface Sampler shall be used for visual inspection of <br /> the groundwater to note sheens (difficult to detect with the <br /> w 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. Veils containing fret 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 /> .r <br /> , t <br /> i <br />