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I. INTRODUCTION Mr. David Smith is proposing to subdivide an existing 7.32 acre parcel into three homesite parcel's " in a rural, unsewered portion of.San Joaquin County.-' This report presents the test results and research findings of the Nitrate Loading and Soil Suitability Studies conducted as a prerequisite for this proposed Minor Subdivision? A.Tentative Map'has not been drawn as of the date o this? .Report. Attorney Mike Hakeem of the law firm Hakeem, Ellis and Marengo is representing Mr. 'Smith's application. The subject property is located east of Stockton on North Alpine Road, between Highway 26 and 3> Copperopolis Road. Water and sewer-Trom the City.of Stockton do not extend to the-subject .property and probably.never.will. The property is located in Township 2 North, Range 7 East, and has the address of 767 North Alpine Road. It is bound to the north by the defunct Southern Pacific Railroad (S.P.R.R.) tracks and a walnut orchard. To the south is Orford Road with single family residences (SFRs) and agricultural production land. To the west are SFRs on the north side of Orford Road and additional agricultural production land. To the east are ranchettes and horse boarding facilities. The San"Joaquin County Environmental Health Department(PHS-EHD)requires'Nitrate Loading and Soil Suitability Studies for projects in unsewered 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 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 hemoglobin in the blood. Only infants and young children are susceptible to this disease, which is extremely rare. f Nitrate concentrations in water can be expressed in two different terms: 1.) As the weight of the nitrate molecule, which is one atom of nitrogen and three atoms of oxygen for an atomic weight of 62 units. Or, 2.) Nitrate can be expressed as the amount of the nitrogen atom itself. This one atom of nitrogen (N) in a nitrate molecule contributes 14 atomic weight units to the weight of the nitrate molecule. The ratio of weight of the nitrate molecule (NO3) to the atom(N) is 62114 or approxwi imately 4_S, The -A. has established the Maximum Contaminant Level (MCL)-of nitrate'in drinking water at 45 mg/l as nitratC.TDue to the ratio described-above; the MCL is sometimes reported as 10 mg/l as nitrate-nitrogen- Staff from the Environmental Health Department has stipulated these studies address the following information: w✓,; Investigate the physical and chemical surface and subsurface soil characteristics of the subject property. Conduct percolation testing in areas which will compose the anticipated Parcels. tOV) Investigate the current nitrate and DBCP concentrations within the underlying groundwater by analyzing the on-site well water. Chesney Consudting