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Sit Sampling in Borings <br /> No soil samples will be collected from the replacement well/boring Subjective evidence of <br /> hydrocarbons, such as soil staining, obvious product odor, and photoionization detector (or <br /> similar instrument) readings will be recorded in field notes and included in a summary report <br /> If subjective evidence indicates the absence of soil contamination, drill cuttings will be <br /> incorporated into site grounds via surface spreading <br /> Monitoring-Well Construction <br /> The replacement monitoring well will be constructed in the boring with thread jointed <br /> Schedule 40 PVC casing No chemical cements, glues, or solvents will be used in well <br /> construction The screened portion of each well will consist of factory-perforated casing, with <br /> slots of 0.010 inches in width The well screen will extend from approximately 2 feet below <br /> grade to approximately 12 feet below grade This screened interval will allow sampling at the <br /> air-water interface during seasonal and other fluctuations of the groundwater level The <br /> annular space in the well will be packed with sand compatible with well slot size to <br /> approximately one-half to one feet above the slotted interval A one to two foot thick <br /> bentonite plug will be added above the sand pack to prevent the cement from entering the well <br /> pack The remaining annulus will be backfilled to grade with a bentonite cement slurry <br /> The well will be protected with a traffic-rated, cast-aluminum, watertight utility box equipped <br /> with a PVC skirt or a steel well monument The well casing will be secured with a lockable, <br /> watertight cap. <br /> Well Development <br /> The newly installed groundwater monitoring wells are allowed to stabilize a minimum of 24 <br /> hours after installation prior to development to allow the grout to seal Before developing the <br /> monitoring wells, a water sample is collected for subjective analysis from near the water <br /> surface in the well with a dedicated disposable bailer The wells are developed by pumping, <br /> bailing, and or surge-block techniques Well development continues until the discharge water <br /> is relatively clear of silt and sand Clay-size sediments derived from the screened portion of <br /> the formation cannot be entirely eliminated by well development After the wells have been <br /> adequately developed, a sample is collected for laboratory analysis <br /> 1500751QUARTLYIPLDMTHDS doc 3 <br />