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SPECTRUM EXPLORATION, INC. <br /> 2825 East Myrtle Street <br /> Stockton, CA 95205 <br /> (209)465-8712 <br /> June 17 , 1988 <br /> Doug Ries <br /> Moldenhauer Engineering Company <br /> 1107 Kennedy Place #7 <br /> Davis , CA 95616 <br /> Dear Doug: <br /> As you have requested, I am writing to explain our monitoring <br /> well development procedures used at the South West Hide facility <br /> in Manteca, California. <br /> We installed 2 inch schedule 40 PVC casing at this site as <br /> prescribed by Moldenhauer Engineering Company. The development <br /> procedures began by surging the well with a surge block. <br /> The surge block was constructed by sandwiching a piece of stiff <br /> rubber between two metal plates . The diameter of the surge block <br /> is approximately 1-7/8 inches . The unit is threaded into an AW <br /> drill pipe and lowered down inside the PVC casing to the bottom <br /> of the screened section. The surge block is then lifted up and <br /> down with the use of a nylon rope and cathead which is located <br /> on the drill rig. This action forces water in and out of the <br /> filter pack surrounding the screened section of the well . This <br /> action stablizes the filter sand pack and draws silt and other <br /> fine material into the well casing. After the surging has been <br /> completed, the turbulent water is removed with a bailor. <br /> The bailor is made of PVC pipe and uses a ball check valve to <br /> trap the water. The bailor is brought to the surface and the <br /> water is poured out . <br /> The geologic formation in which the well has been installed, the <br /> screen size and filter sand pack size will dictate the number of <br /> times you must surge and bail each well . <br /> We terminated the development procedures after each well produced <br /> clear water when bailed. <br /> C-1 <br />