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£ a <br /> S <br /> WaterWork <br /> Groundwater Monitoring Proms <br /> Monitoring depth to water and free product thickness within wells <br /> at the site will be conducted using an Interface <br /> Probe <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 sure -ad). For consistency, <br /> VA all measurements will be taken from cne north nide 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 /> 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 /> (Prod ret Thickness) ( .8)+(Water Elevation) <br /> m Corrected Water Elevation <br /> 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 /> hours after development prior to free product inspection. . <br /> 4 <br /> + }. An acrylic Surface Sampler will be used for visual inspection of <br /> 3� f g 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 /> y x � inspection of product thickness. <br /> To reduce the <br /> potential for cross contamination between wells, <br /> the monitorings will take place in order from the least to most <br /> contaminated. Wells oantaining free product will be monitored <br /> z " ]est. Between each monitoring the equipment will be washed with <br /> 4`s. laboratorygrade detergent and double rinsed with. tap water, and <br /> final rinsed with deionized water. <br /> as ' <br /> Water, level data collected from the wells will be used to da_v_ele <br /> M_kr-- — _ a__-groundwatersquipotential con;our .-ma --fore the -- <br /> - 5 Groundwater flow will be est imated' to be Project site. <br /> rya . equipotential contour lines drawn on the map, perpendicular to <br /> r <br /> 11 Y <br /> 7 9qF L <br /> y <br />