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casing with a locking cap will be cemented in place In areas of,high traffic, the monitoring wells will <br /> be completed flush with grade and a lockable protective cover will be secured in place. <br /> Following their installation, each monitoring well will be developed to remove all material that resulted <br /> from the installation process that may clog the well screen An over-pump, surge-pump, or other <br /> appropriate method will be used for well development The monitoring wells will be considered <br /> sufficiently developed when their discharge is significantly free of sand, silt, and discoloration, or until <br /> further development yields no improvement in the produced water. To prevent cross contamination <br /> ' during well development, dedicated tubing, check valves, and fittings may be used for each well- <br /> ' The proper development of the wells will ensure measurement of representative groundwater levels and, <br /> if petroleum hydrocarbon fuel is present, a more representative petroleum hydrocarbon fuel thickness <br /> All petroleum hydrocarbon product and contaminated water produced during monitoring well <br /> ' development and subsequent sampling will be containerized and will remain the property of the client <br /> Alternatively, fluids may be discharged according to any applicable regulations <br /> A3 Monitoring Well Surveying <br /> ' The elevations of the tops of casing for all the monitoring wells will be surveyed and marked The <br /> elevation of a known benchmark, if available, will be used as a reference point, otherwise a point will <br /> be selected in the field and marked The purpose of the surveying is to allow the water depth measured <br /> in each well to be corrected for topographic elevation differences, and well construction differences. <br /> At least two sets of water level measurements will be taken after monitoring well development The <br /> purpose of the two sets of water levels is to cross check levels and to discover any anomalies <br /> ' A.4 Groundwater Sampling <br /> Groundwater samples will be collected from all of the monitoring wells in which free product 1s not <br /> detected To ensure the acqutsition of high quality samples, the standard sampling protocol will be <br /> used All groundwater sampling will be conducted by Du Pont field personnel <br /> The well cover, cap, and casing will be inspected to ensure the integrity of the system Should there <br /> be evidence that the integrity of the system has been violated, the section manager and the project <br /> manager will be notified for instructions The water level and total depth in each monitoring well will <br /> be measured and recorded to calculate the well's volume An accurate water level measurement will <br /> be obtained with a conventional electronic water level meter At least three well volumes of water will <br /> then be Purged' om each monitoring well in order to remove water that would otherwise blas a <br /> representative groundwater sample. The method of purging(either bailer or pump)will depend on the <br /> recovery rate of the monitoring well Produced fluids will be handled as described above <br />' 4005111 Rev 0 Du Pont Environmental Remediation Services A-3 <br /> Printed on Recycled Paper <br />