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July 1,2019 <br /> NITRATE LOADING STUDY <br /> LAWRENCE LIVERMORE NATIONAL LABS <br /> SITE 300 <br /> 15999 W CORRAL HOLLOW ROAD <br /> TRACY,CALIFORNIA <br /> APN:251-140-05 <br /> 1.0 INTRODUCTION <br /> Petralogix Engineering,Inc.has been retained by Mr.Alex Lim(Geosphere,Inc.)to conduct a Nitrate <br /> Loading Study (NLS) for the property located at 15999 W Corral Holl Tracy, San Joaquin <br /> County, California. The site assessor parcel num er is (APN) 251-140-05. This report is being <br /> performed in conjunction with our Soil Suitability Study (SSS) for the site, and it is referenced <br /> throughout for additional details (as needed). <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. 1/ <br /> A simple mass balance formula, as discussed in the article by Hantzshe and Finnemoret 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 1 and 2.The units of nitrate used in <br /> the mass balance equation are nitrate-N, whose maximum drinking water contaminant level is 10 v <br /> mg/L.This report has been developed in conjunction with our concurrent Soil Suitability Study(SSS) <br /> for the same project and site. <br /> 1.1 Description of Site <br /> The property is located at 15999 W Corral Hollow Road,Tracy,San Joaquin County,California.(APN: <br /> 251-140-05). The property consists of one parcel totaling 5753.40 acres. There are rou hg ley 333, <br /> str res onsite which have septic systems as part o their design an unction. Some of these <br /> systems are use , w e o e onsite activ>ties are related—to government/military <br /> testing services,with a variety of uses. Access roads,water wells,buildings,and test areas are spread <br /> across the site. <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 4!„ <br /> www.petralogix.com <br />