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Smith Environmental Technologies Corporation <br />Quality Assurance/Quality Control Plan <br />Revised February 1995 <br />Product thickness is calculated by subtracting the depth to product from the depth to water. In <br />addition, water elevations are adjusted for the presence of fuel with the following calculation: <br />(Product Thickness) ( 8) + (Water Elevation) = Corrected Water Elevation <br />NOTE: The 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 <br />inspection. <br />An acrylic Surface Sampler will be used 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 />sampler is cahbrated in inches and centimeters for visual inspection of product thickness. <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 />m:\...\shc1ls\QAQC-95.WP5 <br />8 <br />SMiH <br />