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Pumps Steam cleaned between each use <br /> Bailers Steam cleaned between each use <br /> Teflon Sampling Bailer Alconox washed, then steam cleaned and <br /> rinsed with distilled water prior to sampling <br /> each well <br /> The water used for steam cleaning was obtained from the site or from the water tank of the <br /> drill ng or driller's support truck Deionized water was used for rinses The water generated <br /> rduring decontamination procedures was stored in 55-gallon drums on site <br /> WELL INSTALLATION <br /> Soil boreholes were completed as morutonng wells by installing flush-threaded, PVC casing <br /> Inside the borehole No solvent cements were used on the casing The screened casing was <br />' machine-slotted with 0 010-inch slots Screened sections of casing will across the saturated <br /> interval A threaded bottom cap was attached to the bottom of the casing The annular space <br /> surrounding the casing was at least 2 inches thick, and packed with Number 2/12 sand to <br /> approximately 2 feet above the top of the screened interval A 2-foot-thick bentonite seal was <br /> set above the sandpack and grout was trermed from the top of the bentonite seal to the ground <br /> surface <br />' A traffic-rated vault box with a locking device was set in concrete to protect the wells The <br /> well location was surveyed for relative elevation A detailed well completion diagram was <br />' then prepared <br />' Well Development <br /> The monitoring wells were developed by surging, swabbing, and bailing until a non-turbid <br /> discharge was obtained and the pH, temperature, and specific conductivity had stabilized <br /> within 10 percent of their previous reading All development equipment was steam cleaned <br />' prior to developing the well Development and steam-cleaning water were contained in 55- <br /> gallon drums and stored on site pending proper disposal <br /> i <br /> I <br /> 04!18194!1213821125997/DRILDONE DOC <br />