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I. INTRODUCTION Mrs. Jessie DeAngelis is proposing to split a 6.5 acre parcel into a two acre homesite parcel to be designated as Parcel 1, and an approximate four acre Parcel as the"Designated Remainder" in a rural, unsewered southwest portion of San Joaquin County. The project site is south of the City of Tracy and southwest of the Tracy Defense Depot. City of Tracy water and sewer systems currently terminate at Valpico Road. The section of land where the DeAngelis residence is located, referenced as the"Valpico Section,"may never hook up to City water and sewer. The Valpico Section of land is one mile square, bordered by Valpico Road to the north, Linne Road to the south, Chrisman Road to the east and MacArthur Road to the west. There are water wells operated by County Service Area 44 (CSA 44) that serve the Valpico Section. It is our understanding that if a second unit dwelling is built on proposed Parcel 1, the development must connect to CSA 44. This report presents the findings of the Nitrate Loading Study and.Soil Suitability Study conducted for the proposed subdivision of the subject property. The San Joaquin County Environmental Health Department(EHD)requires Nitrate Loading and Soil Suitability Studies for projects in unsewered and currently nitrate impacted areas, or for projects which may potentially impact the underlying groundwater with nitrate. This report complies with the San Joaquin County Development Title, Section 9-1105.2 for a Nitrate Loading Study and Soil Suitability Study. Additionally, this proposed project must comply with the Environmental Health Department Sewage Standards, specifically Section 10 - "Requirements for Waste Disposal for New Land Developments." The Conditions of Approval as issued by the Environmental Health Department has stipulated that "additional septic systems for new parcels cannot impact the overall accumulation of nitrates in the first water aquifer." As specified by the Environmental Health Department, the statement of "no further impact" correlates with the "Porter Cologne Water-Act"which states there can be no further degradation to waters of the State of California. The primary concern of nitrate in drinking water is that high concentrations can cause methemoglobinemia in infants. This disease occurs through a series of complex chemical reactions within the hemoglobin in the blood. Only infants and young children are susceptible. Although this disease is extremely rare, nitrate can also potentially cause other health concerns. There have been 1 scientific studies to suggest that nitrate may produce carcinogenic effects. Nitrate Loading Studies and Soil Suitability Studies have been prepared for a number of major developments to the south and southeast of the City of Tracy. Results of these Studies indicate comparatively high nitrate concentrations throughout the Valpico Section. The density of these projects have dictated wastewater treatment to be the only viable option to prevent further nitrate impact. With this Study, nitrate-nitrogen impact was quantified through the recognized Hantzsche-Finneinore Equation. From this equation, it was determined that the nitrate-nitrogen loading from the existing residential structure, along with a proposed second unit dwelling, and assessing the project as a whole, would produce a nitrate-nitrogen loading that is below the current concentration of nitrate-nitrogen in the underlying groundwater. Page -I- Chesney Consulting