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y � <br /> FC) PAARC <br /> COLATION TEST :RESULTS: <br /> EL No. PERC RATE IN MINUTES/INCH <br /> Parcel 1 5.9 min/in <br /> Parcel 2 5.0 min/in <br /> III. NITRATE LOADING STUDY FINDINGS <br /> A. GROUNDWATER INFORMATION <br /> I. ESTIMATED GROUNDWATER GRADIENT AND VELOCITY <br /> The static water level under the project is approximately 20 ft below grade according to the Lines <br /> of Equal Depth Map published by the San Joaquin County Flood Control District. The Lines of <br /> Equal Elevation map illustrate the groundwater flow to be in a northwest direction. From this <br /> map, it is apparent the gradient is very gradual as the flow travels northwest, but is steeper <br /> southwest of the subject site. The groundwater directional flow has been further defined by <br /> triangulation and plotted on a United States Geological Survey Map. f <br /> i <br /> The groundwater gradient as the flow gradually descends from the project site is estimated to be <br /> 10 ft_ 14,520 ft (2.75 mi) = 0.00069 ft/ft. The velocity of the groundwater directly <br /> downgradient from the subject site can be estimated by the following formula: <br /> &0, -h2) <br /> Vaquifer= L <br /> 7.5 <br /> Where: <br /> K =Hydraulic conductivity of aquifer formation in gals/day/ft2 7,500 gals/daylft2 (est. based <br /> on a coarse sand formation) <br /> h,= 20 ft <br /> h2= 10 ft <br /> L = 2.75 mi = 14,520 ft <br /> p =porosity of aquifer z 39% (est.) <br /> Vaquifer= 1.8 ft/day <br /> 5 <br /> VafIey Ag Research <br />