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II <br /> Smith Technology Corporation i <br /> Quality Assurance/Quality Control Plan <br /> Revised Februarys 1995 II <br /> ' 13 <br /> Product thickness is calculated by !subtracting the depth to product from the depth to water. In <br /> i <br /> addition, water elevations are adjusted for the presence esence of fuel with the e followingcalculation, :i <br /> at on. <br /> ij <br /> (Product Thieknm) (.8) +(Water Elevadon) =Corrected Water Elevation <br /> � I <br /> NOTE: The.E factor of 0.8 accounts for the density difference between water and petroleum ' <br /> hydrocarbons.:, <br /> Newly installed wells will be allowed to stabilize for 24 hours after development prior to free product i <br /> ii <br /> inspection. <br /> I <br /> An acrylic Surface Sampler will beused for visual inspection of the groundwater in order to note , <br /> sheens (difficult to detect with the;Interface Probe), odors, microbial action and sediments. The <br /> i <br /> sampler is calibrated in inches and centimeters for visual inspection of product thickness. <br /> ,I <br /> To reduce the potential for cross contamination between wells, the monitorings will take place in order <br /> from the least to most contaminated, if known. Wells containing free product will be monitored last. <br /> Between each well monitoring the equipment will be decontaminated. <br /> Water level data collected from the Wells will be used to develop a groundwater contour map for the <br /> project site. Groundwater flow will be estimated to be perpendicular to equipotential lines drawn on <br /> the map. <br /> I <br /> W;IAdmin\She11s1QAQC-97.DOC <br /> I ' <br /> 3 <br />