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i <br /> ATC Associates Inc <br /> Quality AssurancetQuality control Plan <br /> Revised 1998 <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 calibrated in inches and centimeters for visual inspection of product tluckness <br /> To reduce the potential for cross contanunation between wells, the morutonngs will take place in order <br /> from the least to most contaminated, if known Wells containing free product will be morutored 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 /> • 10.0 WELL DEVELOPMENT PROTOCOL <br /> Groundwater monitoring wells will be surged and developed prior to setting the surface seal <br /> Approximately 10 times the volume of water in the casing will be withdrawn if possible Casing <br /> volumes will be calculated in the following manner <br /> VOLUME OF SCHEDULE 40 PVC PIPE <br /> Diameter(inches) LD.(inches) Volume <br /> GWAintar fret <br /> 2 2067 017 <br /> 4 4 026 066 <br />