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File No. 20-2921-01 h"q KLEINFELDER <br /> March 25, 1992 <br /> septic systems on groundwater quality, which include (see <br /> reference 2) : <br /> Internal Factors <br /> 1. Depth to the water table <br /> 2 . Hydraulic conductivity of the aquifer <br /> 3 . Groundwater gradient and direction of flow <br /> 4. Aquifer thickness and effective mixing thickness <br /> 5. Background nitrate-nitrogen concentration of <br /> groundwater <br /> 6. Aquifer geology (e.g. unconsolidated sands, <br /> fractured bedrock, etc. ) <br /> 7 . Potential for denitrification <br /> External Factors <br /> 1. Density of septic systems <br /> 2. Present and potential use of aquifer <br /> 3 . Impact on down-gradient users <br /> 4 . Leakage to (i.e. contamination of) other aquifers <br /> 5. Nutrient status of surface waters in discharge areas <br /> 6. Future land use <br /> 7 . Number of pumping wells in the aquifer and volume of <br /> f water pumped <br /> S. Length of flow path to surface discharge area or <br /> downgradient users <br /> In our evaluation we also considered the fact that the <br /> existing groundwater table is approximately 90 feet below the <br /> ground surface. Leach lines are also separated from first <br /> groundwater by a stratified profile of predominately silt and <br /> clay soils. In addition, as summaries in a previous section <br /> othis report, there have been no reports of leach fief-d <br /> fallures !n the area. <br /> Copyright 1992 Kleinfelder, Inc. Page 8 of 9 <br />