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November 12, 2019 <br /> SOIL SUITABILITY STUDY/NITRATE LOADING STUDY <br /> 21300 MANN ROAD <br /> ACAMPO,CALIFORNIA <br /> 1.0 INTRODUCTION <br /> Petralogix Engineering, Inc. has been retained by Ms.Jennifer De Jong to conduct a Nitrate Loading <br /> Study (NLS) and Soil Suitability Study(SSS) for the property located at 21300 Mann Road,Acampo, <br /> San Joaquin County, California. The site assessor parcel number (APN) is 017-290-09. Proposed <br /> development consists of one new 1,600 square-foot, three-bedroom, two-bath single family home <br /> which will replace a single-family residence converted to a duplex(21300&21296 Mann Road)that <br /> was subject to enforcement activity (No. EN-1700064) "red tag" from the San Joaquin County <br /> Community Development Department, initialized in March 2017. The Environmental Health <br /> Department has requested the owner to submit a Soil Suitability Study (SSS) and Nitrate Loading <br /> Study (NLS) to assess soil conditions pertaining to the development of the parcel and associated <br /> planned septic system as well an evaluation of the projects potential to contaminate surface and <br /> groundwater with nitrate. <br /> The purpose of the SSS is to determine whether the soils are suitable for use with a septic system. <br /> The study was conducted in accordance with the requirements of Section 9-1105.2(d) of the San <br /> Joaquin County Development Code. An important element of an SSS consists of conducting <br /> percolation tests to determine if soils meet the required absorption rates, as required by the San <br /> Joaquin County, Public Health Services, and Environmental Health Department (EHD). This report <br /> has been formatted to correspond with the Soil Suitability Study Requirements Checklist of the San <br /> Joaquin County Environmental Health Department(EHD) dated July 14,2003. <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 /> 1 Hantzshe N., Finnemore, E.J., 1992. Predicating Ground-Water Nitrate-Nitrogen Impacts. Ground Water, Vol 30, No 4. <br /> Petralogix Engineering,Inc. <br /> 26675 Bruella Road,Galt,Ca 95632 <br /> (209)-400-5729 <br /> www.petralogix.com <br />