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476 N Patton Avenue Project No. 2021-00084 Page 12 <br /> the potential impact to groundwater,as well as a useful source of analysis to official planning <br /> agencies. The equation utilized by the Hantzshe and Finnemore approach considers the <br /> development area, soil denitrification factor, rainfall volume, rainfall nitrate concentrations, <br /> waste effluent quantity,and waste effluent nitrate concentration.The formulas, calculations, <br /> and assumptions are provided on Plates 7 and 8.The units of nitrate used in the mass balance <br /> equation are nitrate-N,whose maximum drinking water contaminant level is 10 mg/L. <br /> 1.1 Description of Site <br /> The property is located at 476 N Patton Avenue (APN: 103-130-15), Stockton, County of San <br /> Joaquin, California.The parcel is reportedly 2.20 acres of land. There is currently one single- <br /> family residence with three bedrooms located in the western portion of the site with a septic <br /> system of unknown tank size and number of leach lines which serves the current residence. <br /> The property is located in a rural residential neighborhood, with Highway 4 approximately <br /> .751 miles south and California State Highway 26 1.5 miles north of the site. The general <br /> vicinity consists of rural residential lots and agricultural use. <br /> The elevation at the site, according to a United States Geological Survey2, is approximately <br /> 55 feet above mean sea level (msl). The site is relatively flat, with topography in the area <br /> grading gently to the west. <br /> According to the San Joaquin County District Viewer web site,3 the subject property is zoned <br /> R-R. <br /> Location maps of the subject property are attached to this report as Appendix A. <br /> 1.2 Proposed Development <br /> The property currently consists of 2.20 acres of land with a primary three-bedroom <br /> residence with associated septic system. The project proposes to build a three-bedroom, <br /> two-bath, single family manufactured home with a seperate onsite septic system; there is <br /> currenly one domestic well in use. <br /> 2.0 PAST,PRESENT AND PROPOSED FUTURE USES <br /> Present use consists of a three-bedroom single-family home and associated septic system. <br /> There is currently one domestic well on site. Proposed future use is a three-bedroom, <br /> two-bathroom accessory dwelling unit with a proposed new septic system. <br /> z US Geological Survey,2018,7.5'Topographic Map,California,Stockton East Quadrangle. <br /> 3 San Joaquin County District Viewer,http://sjmap.org/website/DistrictViewer/Viewer.asp. <br /> Petralogix Engineering,InC. - <br /> 26675 BruelIa Road,Galt.Ca 95632 <br /> (209)-40o-5729 <br /> www.petralogix.com <br />