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Nitrate Loading Study Irerracon <br /> Arellano Property-� Stockton, California <br /> April 26, 2019 Terracon Project No. NA187058 <br /> NITRATE LOADING STUDY <br /> ARELLANO PROPERTY (APN 103-040-28) <br /> 150 S. ALPINE ROAD <br /> STOCKTON, SAN JOAQUIN COUNTY, CALIFORNIA <br /> OUR PROJECT NUMBER: NA187058 <br /> Our office was contacted by Mr. Ismael Solario, architect, to conduct a Nitrate Loading Study <br /> (NLS) for the property at 150 S. Alpine Road, Stockton, San Joaquin County, California. The <br /> formatting of this report has been designed to follow, to the greatest degree possible, San Joaquin <br /> County Environmental Health Department (EHD) Nitrate Loading Study Requirements Checklist, <br /> dated July 14, 2003. <br /> Based on information received from Mr. Solorio and recent Google Earth aerial photos, we <br /> understand the site consists of an approximately 2.0-acre tract of land(APN 103-040-28)currently <br /> improved with a 2,191 square foot (SF) three bedroom residence with septic system, 486 SF <br /> garage, 11,520 SF agricultural building, utilities, a groundwater well, and additional agricultural <br /> structures. <br /> Because of concern regarding nitrate leaching into groundwater from septic systems, a nitrate <br /> loading analysis is required by the EHD for the proposed development to determine the potential <br /> concentration of percolating effluent and rain fall over the long term. Where percolating effluent <br /> leaches into the ground, groundwater quality may be impacted to some degree should the effluent <br /> reach groundwater. <br /> The method utilized for the nitrate loading analysis is based on a simple mass balance formula, <br /> discussed in a published article by Hantzsche and Finnemore (1992), which provides a <br /> convenient and simplified method to estimate long-term groundwater nitrate impacts on an area- <br /> wide basis. <br /> Hantzsche and Finnemore found that over a long period of time, water quality in the upper <br /> saturated groundwater zone closely approximates the quality of percolating recharge waters. <br /> They believe that their method is a good planning tool and provides useful information to planners <br /> and local officials but with some real limitations. In their article published in Ground Water, <br /> Hantzsche and Finnemore mention that "...the equation ignores dispersion, lateral flow, and <br /> mixing with groundwater flow from up-gradient areas. These processes would generally <br /> contribute to additional reduction of nitrate-nitrogen concentrations in groundwater to the extent <br /> that the nitrate-nitrogen concentration of groundwater flow from up-gradient areas is lower." <br /> The Hantzsche and Finnemore approach is "...a conservative (worst case)first approximation of <br /> groundwater nitrate-nitrogen concentration resulting from the combined effect of on-site sewage <br /> disposal systems and precipitation. This (the equation and approach) is for estimation of long- <br /> Responsive m Resourceful n Reliable 2 <br />