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l <br /> I. INTRODUCTION <br /> This report issues our findings regarding the Nitrate Loading and Soil Suitability Studies for the <br /> A.& M. Pombo property on South Banta Road. The Pombo property consists of three parcels, <br /> and a Designated Remainder, which were created by Lot Line Adjustment. These studies were <br /> required by the San Joaquin County Department of Environmental Health (PHS-EHD). The <br /> Environmental Health Department requires Nitrate Loading and Soil Suitability Studies for <br /> j projects in unsewered and currently nitrate impacted areas, or for projects which maypotentially <br /> impact the underlying groundwater with nitrate. This report complies with the San Joaquin r <br /> County Development Title, Section 9-1105.2 for a Nitrate Loading Study and Soil Suitability <br /> Study. Additionally, this proposed project must comply with the Environmental Health <br /> Department Sewage Standards, specifically Section 10 - "Requirements for Waste Disposal for <br /> New Land Developments." <br /> 'The primary concern of nitrate in drinking water is that high concentrations can cause <br /> methemoglobinemia in infants and it can also induce abortion or death in cattle. This disease . <br /> occurs through a series of complex chemical reactions within the hemoglobin in the blood. Only <br /> infants and young children are susceptible. Although this disease is extremely rare, nitrate can <br /> also potentially cause other health concerns. Scientific studies suggest that nitrate may produce <br /> carcinogenic effects in humans. Nitrate concentrations in water can be expressed two ways: 1.) as <br /> the weight of the nitrate molecule, which is one atom of nitrogen and three atoms of oxygen for <br /> an atomic weight of 62 units. Or, 2.) nitrate can be expressed as the amount of the nitrogen atom <br /> itself. The ratio of weight of the nitrate molecule (NO3) to the atom (N) is 62114 or <br /> approximately 4.5. The U.S.E.P.A. has established the Maximum Contaminant Level (MCL) of <br /> nitrate in drinking water at 45 mg/l as nitrate. Due to the ratio described above, the MCL is <br /> sometimes reported as 10 mg/l as nitrate-nitrogen. <br /> Mr. Ron Pombo is the Manager for this project and has provided the preliminary information to <br /> complete these studies. The attached Site Plan was completed by Quartaroli & Associates, Inc. of <br /> Manteca, CA. The project site is located at the east end of the City limits of Tracy on Banta <br /> Road, near the intersection of the Southern Pacific Railroad and the Western Pacific Railroad, y <br /> midpoint between I I`h Street and Linne Road.. <br /> The purpose of these Studies was threefold: i <br /> r <br /> ❑ To analyze the capacity of the indigenous soils to accept commercial wastewater flows,� <br /> assess the soil characteristics for nitrate mitigation, and recommend a septic system that <br /> is in accordance with the San Joaquin County Sewage Standards. This was accomplish6d <br /> by percolation testing and physical/chemical analyses. <br /> ❑ To analyze the underlying groundwater to quantify nitrate impact, to estimate <br /> assimilative capacity for future nitrate impact and to test the on-site well for chloroform <br /> that allegedly originated from the All-Pure Chemical company, south of the subject <br /> property. <br /> } <br /> ❑ Determine the number of people the three parcels can support without exceeding <br /> acceptable nitrate-nitrogen loading rates. <br /> 1 <br /> i <br /> vaffey AB.research <br />