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PERCOLATION TEST RESULTS. <br /> PARCEL WEST PARCEL MIDDLE PARCEL EASTPARCEL <br /> L <br /> PERC DEPTH PERC RATE PERC RATE PERC RATE <br /> SHALLOW 35.7 nun/in @ 42 Inch Depth 41.7 min/in @ 42 Inch Depth Failed @ 42 Inch Depth <br /> PERC DEPTH <br /> . INTERMEDIATE No Perc Test Conducted at the 13.0 min/in @ 10.2 Ft.Depth Failed @ 8 Ft.Depth <br /> PERC DEPTH Intermediate Depth <br /> DEEP Failed @ 23.5 Ft.Depth 5.0 minlin @24.5 Ft.Depth 7.3 min/in @ 24.5 Ft.Depth <br /> PERC DEPTH (Possibly due to cave-in) <br /> III. NITRATE LOADING STUDY RESULTS <br /> A. GROUNDWATER INFORMATION <br /> I. GROUNDWATER GRADIENT, VELOCITY AND ANALYSES <br /> The static water level under the center of the project is located approximately 73 feet below grade <br /> according to the 1999 Lines of Equal Depth Map published by the San Joaquin County Flood Control <br /> District. The 1999 Lines of Equal Elevation map illustrate the groundwater to be approximately-25 ft <br /> MSL. The 1992 Lines of Equal Elevation map illustrates the groundwater to be -62 ft MSL. <br /> Therefore, the static groundwater level appears to have risen 37 feet in the past seven years. <br /> Current groundwater directional flow is in a north-northeasterly direction according to the Lines of <br /> t= Equal Elevation Contour map. From this map, it appears the gradient.is to the north-northeast under <br /> i. the property, and then changes to an east-northeasterly direction south of the property. The 1992 <br /> Equal Elevation Map indicates the groundwater flow to the north-northwest due to apparent heavy <br /> groundwater pumping in this area. <br /> 1 . <br /> The groundwater gradient under the subject site is estimated to be -20 ft - (-30 ft) 5,800 ft = <br /> 0.00172 ft/fl, based on the distance between contour lines under the property. The velocity of the top <br /> ' groundwater formation under the site can be estimated by the following formula: <br /> K (h3 -h21 <br /> Vaqu*r= L <br /> 7.5 p I <br /> Where: f <br /> K =Hydraulic conductivity of aquifer formation in gals/day/ft' 2500 gals/day/ftp <br /> (Estimated based on a silty clay formation denoted on well log for 7425 Orford Road below the 70 foot depth.) <br /> h,= -20 ft <br /> h, = -30 ft <br /> L- 5,800 ft <br /> p = porosity of aquifer z 35%, (estimated) <br /> V,quiF�,=2.3 ft/day or 840 ft/yr <br /> 6 <br /> Chested Consulting <br />