Laserfiche WebLink
r <br /> March 16, 2006 <br /> NOA Project Number: E0601 1A <br /> 1F <br /> 2.3 Current and Future "Site Ground Water Uses <br /> No wells exist on the subject property. The construction of a single family residence is the proposed <br /> development by Mrs. Grace Segura. <br /> 3.0 SOURCES U CES AND IMPACT OF NITRATE TO GROUND WATER <br /> 3.1 Current Off-Site Sources of Nitrate <br /> We recognize that septic systems, agriculture, and dairies in the Qmnaythe most significFJ <br /> sources of nitrate. Septic tank use in the vicinity is discussed inf the SSS. <br /> No well currently exists on the Site, therefore no water sample was analyzed. <br /> 3.2 Contribution of Rainfall <br /> F! An estimate of the quantity and quality of rainfall was required for the nitrate loading analysis. The <br /> estimate of deep percolation of rain is based on the average monthly precipitation of rainfall and <br /> evapotranspiration for East Tracy, California. The estimate first determines whether the average <br /> F1monthly precipitation exceeds average monthly potential evapotranspiration. If so, the -the <br /> difference is potential deep percolation. This method does not consider runoff. See late 5 or the <br /> data and calculation. <br /> I <br /> Average potential evapotranspiration and average rainfall data was obtained from the California <br /> Irrigation Management Information System (CIMIS). The data from January 1988 to December <br /> 2004 was used for the calculation. <br /> Based on this method, the average de� rcolZtion of rain for the Tracy-Afea is estimated to be 1.27 <br /> F'. <br /> inches. The nitrate concentration of L''-falf-was estimated to be 1 mg/L-N (Hantzsche and <br /> Finnemore, 1992). T�/ <br /> 3.3 Current On-Site Sources of Nitrate <br /> The site is vacant land. No sources of nitrates besides septic effluent and rainfall are recognized. <br /> i <br /> 3.3.1 Existing Septic System <br /> No septic systems exist on the Site. <br /> Fil <br /> P- 3 '0044 <br /> h <br />