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September 20, 2021 <br /> SOIL SUITABILITY STUDY/NITRATE LOADING STUDY <br /> 33503 S KOSTER ROAD <br /> TRACY,CALIFORNIA <br /> 1.0 INTRODUCTION <br /> Petralogix Engineering, Inc. has been retained by Ms. Pedro Perez to conduct a Nitrate <br /> Loading Study (NLS) and Soil Suitability Study (SSS) for the property located at 33503 S <br /> Koster Road, Tracy, San Joaquin County, California. The site assessor parcel number (APN) <br /> is 255-90-32. Proposed development consists of a two-bedroom, two-bath residential <br /> accessory dwelling unit(ADU).The parcel currently has one primary single-family residence <br /> with three bedrooms and two baths. The Environmental Health Department has requested <br /> the owner to submit a Soil Suitability Study (SSS) and Nitrate Loading Study (NLS) to assess <br /> soil conditions pertaining to the development of the parcel and associated planned septic <br /> 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 <br /> system. The study was conducted in accordance with the requirements of Section 9- <br /> 1105.2(d) of the San Joaquin County Development Code. An important element of an SSS <br /> consists of conducting percolation tests to determine if soils meet the required absorption <br /> rates, as required by the San Joaquin County, Public Health Services, and Environmental <br /> Health Department (EHD). This report has been formatted to correspond with the Soil <br /> Suitability Study Requirements Checklist of the San Joaquin County Environmental Health <br /> Department (EHD) dated July 14, 2003. <br /> The San Joaquin County Environmental Health Department recognizes nitrate <br /> contamination as a significant threat to the surface and groundwaters of the County. <br /> Groundwater quality may be impacted by nitrate contamination where percolating effluent <br /> leaches into the ground, should this effluent reach groundwater. Due to the EHD concerns <br /> regarding nitrate leaching into the surface and groundwaters from septic systems, a nitrate <br /> loading study is required by the EHD for the proposed development to measure the potential <br /> concentration of percolating effluent and rain fall over a long period of time. This report has <br /> been prepared to meet the requirements of the San Joaquin County EHD's Nitrate Loading <br /> Study Requirements Checklist, dated July 14, 2003. <br /> A simple mass balance formula, as discussed in the article by Hantzshe and Finnemorel in <br /> Ground Water, provides a method for nitrate loading analysis to estimate long-term <br /> groundwater nitrate impacts for a wide area. Based on the Hantzshe and Finnemore study, <br /> water quality in the upper saturated groundwater zone approximates the quality of <br /> percolating recharge waters,which the authors believe is a reliable planning tool to estimate <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 6rueIla Road,Galt,Ca 95632 0 <br /> (209),400-5729 <br /> www.petralogix.com <br />