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�f <br /> WaterWork <br /> Groundwater MoRitori.n Protocol <br /> r 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 /> k Product thickness is calculated by subtracting the depth to <br /> depth to water. In addition, water elevations <br /> product from the p <br /> p in <br /> he follow <br /> for the presence of fuel with t 3 <br /> P <br /> are adjusted <br /> calculation: ' <br /> (Product Thickness) ( .8)+(Water Elevation) <br /> s <br /> Corrected Water Elevation <br /> � <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 /> s rY <br /> detect <br /> with the <br /> =-.s. . <br /> -.-. ficult <br /> to <br /> the groundwater to nate sheens (dif <br /> interface Probe) , odors, microbial action ind sediments. The <br /> sampler is calibrated in inches and cent meters for visual <br /> inspection of product thickness. <br /> i. <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. Setwgradeach deter detergentmonitoring <br /> doubleequipment <br /> rinsed with tapwwater, with <br /> and <br /> ` laboratory g g <br /> final rinsed with deionized water. <br /> i <br /> I <br />