Laserfiche WebLink
PERCOLATION AND HYIIRAULT�C„ N. <br /> CODUCTI.I TY TEST RESULTS <br /> SHALLOW PERC TEST PERC RATE IN HYD.COND.TEST GALLONS/SO FT/DAY <br /> MIN/INCH <br /> Homesite- Shallow(42 in.) 10.0 min/in Homesite- Shallow(24 in) 3.0 gals/ft2/day <br /> III. NITRATE LOADING STUDY RESULTS <br /> A. GROUNDWATER INFORMATION <br /> 1. ESTIMATED GROUNDWATER GRADIENT <br /> The static water level in the Cole's domestic well was measured on August 9, 2001 and found to <br /> be at a depth of.48!ft. The Lines of Equal Depth Map and the Lines of Equal Elevation Map <br /> published by the San Joaquin County Flood Control District do not illustrate the groundwater <br /> depth and elevation for the most recent year published (2000). However, the 1992 Lines of <br /> Equal Elevation map illustrates the groundwater flow to be in a northeasterly direction: This <br /> direction is confirmed by the contaminant plume originating from the Tracy Defense Depot. <br /> 2. ANALYSIS OF ON-SITE DOMESTIC WELL <br /> The domestic well that serves the Cole homesite was purged at the well head before sampling. <br /> Additionally, there is a water softener on the system; therefore, the sample was taken at the well <br /> head to prevent potential influence from the softener. The nitrate concentration was determined <br /> to be 38 ppm nitrate (as NO3), The Maximum Contaminant Level (MCL) for nitrate (as NO3) is <br /> 45 ppm. DBCP and EDB were Below Detectable Limits (BDL). The MCL for DBCP is 0.0002 <br /> ppm or 0.2 µglL. A summary of the water well test results are as follows: <br /> NITRATE'<AND DBCP/EDB CONC-ENTRATIONS <br /> CO;(.,E Il{�MESTI<C V�ELL <br /> NITRATE CONC. DBCP/EDB CONC. <br /> 38 ppm as NO, 0.0 ug/L= BDL* <br /> * Below Detectable Limits <br /> B. SURFACE WATER INFORMATION <br /> Surface water consists of all other water sources originating on the surface of the project, other <br /> than septic system effluent. These sources include rainfall, surface runoff, domestic irrigation <br /> and stormwater retention. The San Joaquin County of Public Works - Isohyetal Map indicate <br /> ..13inches of rainfall,to be the Mean Annual Precipitation in the area of the project. <br /> Page -4- <br /> Valfey AB.research <br /> j <br />