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I. INTRODUCTION This report issues my findings regarding the Nitrate Loading and Soil Suitability Studies for a single parcel of land owned by Mr. Les Calkins. These studies are required by the San Joaquin County Department of Environmental Health(EHD)under Community Development Title Chapter 9-1105.2 (d)1-5. This report complies with the San Joaquin County Development Title, Section 9-1105.2 for a Nitrate Loading Study and Soil Suitability Study. The Environmental Health Department requires Nitrate Loading and Soil Suitability Studies for projects in unsewered and currently nitrate affected areas, or for projects that may potentially impact the underlying groundwater with nitrate. Any improvement to the subject property must comply with the Environmental Health Department Regulations and Standards. As owner of the property, Mr. Calkins provided the preliminary information to complete these Studies. The attorney for this project is Mr. Jose Alva, Esq. The property is located in the northwest corner of the Highway 99 Frontage Road and Woodbridge Road. The primary concern of nitrate in drinking water is that high concentrations can cause methemoglobinemia in infants and it can also induce abortion or death in cattle. This disease occurs through a series of complex chemical reactions within the h( infants and young children are susceptible. Although this disease i; also potentially cause other health concerns. Scientific studies sugl � carcinogenic effects in humans. Nitrate concentrations in water car As the weight of the nitrate molecule, which is one atom of nitroge for an atomic weight of 62 units. Or,2.)Nitrate can be expressed a atom itself. The ratio of weight of the nitrate molecule (NOD to the approximately 4.5. The U.S.E.P.A. has established the Maximum I nitrate in drinking water at 45 mg/l as nitrate. Due to the ratio des( sometimes reported as 10 mg/1 as nitrate-nitrogen. The primary purpose of these Studies was to obtain data and information to show that the subject property can beself-supporting regarding domestic water and on-site sewage systems, without mandatin the r2 connect&d to a public waters stem and wastg=g treatmentplant._ This self-supporting determination is base upon the following investigative results: 1.) The indigenous soils were analyzed and tested for their capacity to accept commercial wastewater flows, 2.) Property soil characteristics were assessed for nitrate impact and nitrate mitigation potential, 3.) Underlying groundwater from the drinking water aquifers was analyzed for the current nitrate concentration, and 4.) Examples of septic system components (e.g., septic tanks and leachfields)were provided to illustrate operational feasibility. To examine the nitrate loading potential of the subject parcel, nitrate loading calculations were done under two scenarios. First, loading calculations were done, for then r-firture ani .in tPrl wastewater flows, which were based upon provided information. Secondly, loading calculations were one to deet�ermine the maximum number of people the parcel c-a-T"in-Tividually supp= without exceeding the MCL for nitrate in drinking water, which is ppm (as NO3). It was determined that the property can support twice the number of people what is currently being proposed. 1 Chesney Consulting