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rThgradient as the flow gradually descends from the project site is estimated to be <br /> e <br /> (3 mi) = 0.00063 ft/ft. The velocityof the groundwater directly downgradientsite can be estimated by the following formula: <br /> K(hiz.�h ) <br /> Vaquifer L <br /> 7.5 p <br /> Where: <br /> K= Hydraulic conductivity of aquifer formation in gals/day/ft2 =7,500 gals/day/ft, (est. based <br /> on a medium sand formation) <br /> h,= 40 ft <br /> h, = 30ft <br /> L:= 3.0 mi = 15,840 ft <br /> p=porosity of aquifer = 39% (est.) <br /> Vaquifcr= 1.6 ft/day <br /> _ 2. ANALYSES OF ON-SITE DOMESTIC AND IRRIGATION WELLS <br /> Although there are 11 domestic and irrigation wells over the entire subject property, only seven <br /> wells which were operational and accessible were sampled. Two irrigation wells could not be <br /> sampled since there was harvested almonds on the ground. The Maximum Contaminant Level <br /> (MCL) for nitrate (as NO3) is 45 ppm. The MCL for DBCP is 0.0002 ppm or 0.2 /eg/L. A <br /> summary of the water well test results are as follows: <br /> NITRATE AND DBCP/EDB CONCENTRATIONS <br /> ADDRESS NITRATE CONC. DBCP/EDB CONC. <br /> 14625 E. Donahue Road 30 ppm as NO, 0.024µg/L/BDL" <br /> +14622 E. Donahue Road 43 ppm as NO, BDL/BDL <br /> 14966 N. Ripon Road 10 ppm as NO, BDL/BDL <br /> _ 18404 N. Ripon Road 17 ppm as NO, BDL/BDL <br /> 18404 Ag Well 38 ppm as NO, 0.036µg/L/BDL <br /> _ 18600 N. Ripon Road 40 ppm as NO, 0.10µg/L/BDL <br /> +19909 N. Ripon Road 89 ppm as NO, BDL/BDL <br /> +Well Log Available <br /> Below Detectable Limits <br /> 6 <br /> _ Na!!ey Ag Research <br />