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December 1,2017
<br /> NITRATE LOADING STUDY
<br /> 26440, 8875 &8925 THORNTON ROAD
<br /> THORNTON,CALIFORNIA
<br /> 1.0 INTRODUCTION
<br /> Petralogix Engineering, Inc. has been retained by Ms. Lauren Takos to conduct a Nitrate
<br /> Loading Study for the properties located at 26440 N Thornton Road, and 8925 & 8875 W
<br /> Thornton Road,Thornton, San Joaquin County, California. The site assessor parcel numbers
<br /> are (APN) 001-200-77, 001-200-78, and 001-200-02, respectively.
<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 /> 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 6 and 7.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 site consists of three properties, located at 26440 N. Thornton Road and 8875 & 8925
<br /> W. Thornton Road (APNs: 001-200-77, 001-200-78, and 001-200-02), Thornton, County of
<br /> San Joaquin, California. The parcels are approximately 0.80 acres, 0.55 acres, and 1.02 acres
<br /> for 26440 N. Thornton Road, 8875 W. Thornton Road, and 8925 W. Thornton Road,
<br /> respectively. The parcel located at 26440 N. Thornton Road is vacant, with no current
<br /> structures, septic systems or wells. The parcel located at 8925 W. Thornton Road has a CFN
<br /> PetralogixE"Po ,na 1pc. ;96Tore, E.J., 1992. Predicating Ground-Water Nitrate-Nitrogen Impacts.Ground Water,Vol 30, No 4.
<br /> 26675 Bruella boa a t, 9
<br /> (209)-400-5729
<br /> www.petralogix.com 40
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