Laserfiche WebLink
• <br /> 21 <br /> measured with an electric sounder during drawdown and recovery. <br /> Well discharge would be measured with a totalizing one-inch <br /> diameter flowmeter. Special aquifer test forms would be used to <br /> record the measurements. Field plots would be maintained on <br /> semi-log paper to evaluate possible boundaries and other factors . <br /> Aquifer transmissivity and permeability would then be determined . <br /> The estimated porosity, permeability, and hydraulic gradient, as <br /> determined from a water-level elevation contour map, would be used <br /> to determine the rate of groundwater flow. <br /> Vadose Zone Monitoring <br /> Vadose zone monitoring is not proposed as part of this <br /> program, because of the shallow depth to water (less than 20 feet <br /> deep) . The shallowest permeable strata below the water table would <br /> be tapped by the monitor wells. Sampling of water from these <br /> permeable saturated strata as proposed should be much more reliable <br /> than vadose zone monitoring. <br /> Schedule <br /> Upon approval by the California Regional Water Quality Control <br /> Board, it is anticipated that the new monitor wells can be installed <br /> within twelve months. These wells could be pump tested and sampled <br /> within two weeks after completion. Chemical analyses are normally <br /> available within about three weeks of sample collection. <br /> REFERENCES <br /> California Department,of Water Resources, 1967, "San Joaquin County <br /> Ground Water Investigation," Bulletin No. 146, 177 p. <br /> Page, R.W. , and G.O. Balding, 1973, "Geology and Quality of Water <br /> in the Modesto-Merced Area, San Joaquin Valley, California, " U.S . <br /> Geological Survey Water Resources Investigations 6-73, 85 p. <br />