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I. INTRODUCTION This Technical Information Report contains the information and data required for the Report of Waste Discharge,Nitrate Loading Study, Soil Suitability Study, and Manure Management Plan regarding the existing de Snayer Holstein Dairy Facility. On September 23, 2003, the San Joaquin �.. County Environmental Health Department(EHD) stipulated in their Conditions of Approval document that the Applicant must submit a Report of Waste Discharge (ROWD) in accordance with the Porter Cologne Water Quality Act, Chapter 4, Article 4, Section 13260-13263. The EHD Nitrate Loading Study for dairies correlates with the Nutrient and Irrigation Water Management Plan (NIWMP - Fact Sheet 4), promulgated by the Central Valley Regional Water Quality Control Board. The EHD Soil Suitability Study is primarily concerned with the existing and proposed on-site septic systems and well water analysis. The Manure Management Plan is also closely related to information required in the ROWD. All EHD studies comply with Section 9-1110 (c) and Section 9-1105.2 (d) of the San Joaquin County Community Development Title. Staff from the Regional Water Quality Control Board and staff from the San Joaquin County Environmental Health Department determined that it was acceptable to combine all four studies/ reports as listed on the cover page into a single Technical Information Report, since the information and data presented herein are interrelated for the common goal of protecting groundwater and surface water quality. The Regional Board and the Environmental Health Department consider nitrate contamination a serious threat to surface waters and groundwaters of the State and County. By conducting these types of investigations, the State and County are better able to locate, quantify and mitigate the potential for nitrate and other environmental impacts to groundwater and surface water. High nitrate concentrations in drinking water can have deleterious effect on infants, and may also induce abortion in cattle. The United States Environmental Protection Agency (EPA)has determined 10 mg per liter of nitrate-nitrogen (NO3-N), equivalent to 45 mg per liter nitrate (NO3) in drinking water to be the Maximum Contaminant Level (MCL). There are several aspects of this Technical Report that contribute to its complexity. The following is a brief summary of the significant points concerning this Application: • The de Snayer Dairy is proposing to construct a new milk barn for the "Home Ranch." • The Dairy currently milks 1,100 head of Holstein dairy cows with associated support stock. • It is proposed to increase the milking herd to 1,800 Holsteins. • The de Snayer Dairy's heifers will be raised at the nearby leased "Acampo Ranch." 0 Manure solids from the de Snayer Dairy will be transported to the nearby "Blossom Ranch." • The de Snayer Dairy is one of the few dairies that has a"closed-loop"tailwater return system. • A triple cropping program is to be implemented. • A soil and irrigation water monitoring program is also to be implemented. 4- Chest e Consulting