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i Di Sulva Trucking Report August 31 1995 Pogc 3 • the water column existing above the confining Iayer was relatively small, approximately 3 feet prior to pumping On August 14, 1995, Condor installed in MW1 a groundwater pumping system designed for ishort-term, continuous operation On August 22, the system was turned off Groundwater samples were collected from MW1 on August lb, 1995, following the removal of approximately 3,800- gallons of groundwater, and on August 22, 1995, following system shut down The work was performed according to Condor's Work Plan for Modified Groundwater Sampling, dated July 25, 1995, and approved by San Joaquin County Environmental Health Department, Public Health Services (SJCEHD,PHS) ' 3.1 Groundwater Pumping System The groundwater pumping system consisted of a shaft driven, brass, gear pump and an ' electric motor Pulleys installed on the motor and pump shaft were connected via a V belt and the pump and motor were bolted to a metal mounting plate The mounting plate was located at the ground surface near MW1 Polyvinyl tubing was installed from the pump to a foot valve and the foot valve was located approximately 3 5 feet below the static water level in MW1 Approximately 15,700-gallons of groundwater were removed dunng the systems 8 days of continuous operation The groundwater was discharged from the pump to a 21,000-gallon storage vessel located near MW 1 ' 3.2 Pumping Results ' To evaluate the area influenced by the pumping system, the equation for the volume of a cylinder having a porosity of X was used V=(n r 2H)X where V = volume of water (ftp) ' r = radius of influence (ft) H — height of water column above confining layer (ft) ' X = porosity of aquifer bearing zone above confining layer ' Solving for r, rT V n HX 1 • ' $� CONDOR