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16475 TIDE ROAD Project No.2019-00072 Page 12 <br /> NITRATE LOADING STUDY <br /> 16475 Tide Road <br /> Ripon, CA 95366 <br /> 1.0 INTRODUCTION <br /> Petralogix Engineering,Inc.has been retained by Ms.Jennifer De Jong to conduct a Nitrate Loading <br /> Study for the property located at 16475 Tide Road.Ripon,CA 95366,San Joaquin County,California. <br /> The site assessor parcel number is (APN): 203-100-17. <br /> The San Joaquin County Environmental Health Department recognizes nitrate contamination as a <br /> significant threat to the surface and groundwaters of the County. Groundwater quality may be <br /> impacted by nitrate contamination where percolating effluent leaches into the ground, should this <br /> effluent reach groundwater.Due to the EHD concerns regarding nitrate leaching into the surface and <br /> groundwaters from septic systems, a nitrate loading study is required by the EHD for the proposed <br /> development to measure the potential concentration of percolating effluent and rain fall over a long <br /> period of time. This report has been prepared to meet the requirements of the San Joaquin County <br /> EHD's Nitrate Loading Study Requirements Checklist,dated July 14,2003. <br /> A simple mass balance formula, as discussed in the article by Hantzshe and Finnemorel in Ground <br /> Water, provides a method for nitrate loading analysis to estimate long-term groundwater nitrate <br /> impacts for a wide area. Based on the Hantzshe and Finnemore study, water quality in the upper <br /> saturated groundwater zone approximates the quality of percolating recharge waters, which the <br /> authors believe is a reliable planning tool to estimate the potential impact to groundwater,as well as <br /> a useful source of analysis to official planning agencies. The equation utilized by the Hantzshe and <br /> Finnemore approach considers the development area, soil denitrification factor, rainfall volume, <br /> rainfall nitrate concentrations,waste effluent quantity,and waste effluent nitrate concentration.The <br /> formulas, calculations, and assumptions are provided on Plates 7 and 8.The units of nitrate used in <br /> the mass balance equation are nitrate-N, whose maximum drinking water contaminant level is <br /> 10 mg/L. <br /> 1.1 Description of Site <br /> The property is located at 16475 Tide Road (APN: 203-100-17), Ripon, County of San Joaquin, <br /> California.The parcel is approximately 0.94 acres of land with no structures.The property is located <br /> in a rural residential neighborhood,with French Camp Road adjacent north and approximately two <br /> miles north of Highway 120. The general vicinity consists of rural residential lots and agricultural <br /> use. <br /> The elevation at the Site, according to a United States Geological Survey2, is approximately 60 feet <br /> above mean sea level (msl).The site is relatively flat,with topography in the area grading gently to <br /> the west. <br /> Hantzshe N., Finnemore, E.J., 1992. Predicating Ground-Water Nitrate-Nitrogen Impacts. Ground Water, Vol 30, No 4. <br /> 2 US Geological Survey,2017,7.5'Topographic Map,California,Avena Quadrangle. <br /> Petralogix Engineering,Inc <br /> 26675 Bruella Road,Galt,Ca 95632 <br /> (209)1100-5729 <br /> www.petralogix.com <br />