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33503 S Koster Road Project No.2021-00073 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 33503 S Koster Road (APN: 255-090-32), Tracy, County of San <br /> Joaquin, California.The parcel is reportedly 1.26 acres of land. There is currently one single- <br /> family residence with three bedrooms located in the central portion of the site; one <br /> 1200-gallon septic tank with leach lines and pits is located on the site to serve the current <br /> residence. The property is located in a rural residential neighborhood, with Interstate 5 <br /> approximately 1 mile west and California State Highway 132/Vernalis Road approximately <br /> 0.75 miles south of the site. The general vicinity consists of rural residential lots and <br /> agricultural use. <br /> The elevation at the site, according to a United States Geological Survey2, is approximately <br /> 125 feet above mean sea level (msl). The site is relatively flat, with topography in the area <br /> grading gently to the northeast. <br /> According to the San Joaquin County District Viewer web site,3 the subject property is zoned <br /> AG-40. <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 1.26 acres of land with a primary 3-bedroom residence <br /> with a 1200-gallon septic tank and associated leach lines. The project proposes to build a <br /> two-bedroom, two-bath, single family manufactured home with a seperate onsite septic <br /> system; there is currenly one domestic well in use. <br /> 2.0 PAST,PRESENT AND PROPOSED FUTURE USES <br /> Present use consists of a 3-bedroom single-family home and a septic system with a 1200- <br /> gallon septic tank with Permit No. 87-2400 dated June 18, 1987; there is currently one <br /> domestic well on site, according to Permit No. 87-2804 July 24, 1987. Proposed future use <br /> is a two-bedroom, two-bathroom accessory dwelling unit with a proposed new septic <br /> system. <br /> z US Geological Survey,2018,7.5'Topographic Map,California,Veranlis 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 /> [209j-40o-5729 <br /> www.petralogix.com <br />