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RESNA Industries Inc <br /> Quality Assurance/Quality Control Plan <br /> Revised November 1993 <br /> ' Provided the database is of sufficient size, statistical techniques may be employed for data <br /> validation. <br /> 9.0 GROUNDWATER MONITORING PROTOCOL <br /> Monitoring of depth to water and free product thickness within wells at the site will be <br /> conducted using an Interface Probe or Conductivity Meter. For consistency,-all measurements <br /> will be taken from the north side of the wellhead at the survey mark. To assess potential <br /> infiltration of fine-grained sediments, total well depth will also be sounded. <br /> 1 <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 <br /> ) O + C�'� ) = Corrected Water Elevation <br /> ' NOTE: The factor of 0 8 accounts for the density difference between water andPe troleum <br /> hydrocarbons. <br /> Newly installed wells will be allowed to stabilize for 24 hours after development prior to free <br /> product inspection. <br /> ' An acrylic Surface e 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 calibrated in inches and centimeters for visual inspection of product thickness. <br /> 1 I <br /> I <br /> QAQC1092 ML 7 <br />