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k <br /> R WN <br /> 6 <br /> 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 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 from the north side 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 /> s 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 /> Newly installed wells will be allowed to stabilize for 24 <br /> hours after development p prior to free product inspection. <br /> An acrylic Surface Sampler will be used for visual inspection of <br /> the groundwater in order to note sheens (difficult to detect with <br /> the Interface Probe), odors,. microbial act..on and sediments. The <br /> sampler is calibrated in inches and centimeters for visual <br /> i-� <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 /> Water level data collectedfrom the wells will_be_.used _to -develop <br /> a groundwater equipotential contour mag for the project .site. - <br /> � Groundwater flow will be estimated to be , perpendicular to <br /> equipatential contour lines drawn on the map. <br /> 1 <br />