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GROUND ZERO ANALYSIS INC. Qualit uality Assurance Plan <br /> Yontrol/Q <br /> methods to be utilized for purgeable and semivolatile hydrocarbons analyses are shown on Table <br /> 2. <br /> 9.0 GROUNDWATER MONITORING PROTOCOL <br /> Monitoring of depth to water and free phase LNAPL (light non-aqueous phase liquids) thickness <br /> within wells will be conducted using an interface probe or conductivity meter. For consistency, <br /> all measurements will be taken from the north side of the wellhead at the survey mark. To assess <br /> potential infiltration of fine grained sediments, total well depth will also be sounded. <br /> Thickness of LNAPL on the groundwater surface is calculated by subtracting the depth to <br /> product from the depth to water. In addition, water elevations are adjusted for the presence of <br /> fuel with the following calculation: <br /> (LNAPL Thickness)(specific gravity) + (Water Elevation)= Corrected Water Elevation <br /> Newly installed wells will be allowed to stabilize for 24 hours after development prior to free <br /> phase thickness determination. <br /> An acrylic Surface Sampler will be used for visual inspection of the groundwater in order to note <br /> sheen (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 /> To reduce the potential for cross contamination between wells, the monitoring will take place in <br /> t order from the least to most contaminated, if known. Well containing free product will be <br /> monitored last. 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 <br /> the project site. Groundwater flow will be estimated to be perpendicular to equipotential lines <br /> drawn on the map. <br /> 10.0 WELL DEVELOPMENT PROTOCOL <br /> Groundwater monitoring wells will be surged and developed prior to sampling activities. <br /> Approximately 10 times the volume of water in the casing will be withdrawn if possible. <br /> If the aquifer is slow to recharge, development will continue until recharge is too slow to <br /> practically continue. The volume of water produced versus time will be recorded. All purged <br /> groundwater will be stored on-site in 55 gallon waste drums unless permission is granted by the <br /> appropriate regulatory agency to discharge the water to the <br /> ground surface or sanitary sewer. <br /> Drummed water will be labeled with the source of the water to help ensure appropriate disposal <br /> based on contamination levels. <br /> G:\G ROUNDZE\QAQC\QAQC.doc <br /> 5 <br />