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F TRODUCTIONort issues my findings regarding the Nitrate Loading Study and Soil Suitability Study for osed Ice House Industrial Park. These studies were required by the San Joaquin County Environmental Health Department (EHD) and comply with the San Joaquin County Development Title, specifically Section 9-1105.2(d). Mr. A. Michael Souza of Souza Realty and Development is the owner/developer of the project and has provided the preliminary information to complete these studies. The Site Plan and associated civil engineering information were produced by the engineering firm of Schack & Company of Tracy, California. tS§ 1.2 Me project site is adjacent to the east end of the City limits of Tracy on MacArthur ne-quarter mile south of I I' Street. Currently, the project consistsof the Tracy Cold Storage commercial facility comprising three_buil�ings on a total or 8.1 �acre� It is proposed to improve the property in four phases by razing two_existing buildings and constructing new buildings. This is illustrated on the attached Site Plan Due to this proposed improvement and expansion, EHD is requiring a new septic system be installed to accommodate the entire project. The purpose of these Studies was to collect the following information to fulfill EHD requirements and specify septic system operational parameters for the new on-site domestic wastewater system: • Conduct soil physical and chemical testing for determination of the following: Physical testing included`pefcola—t on testing, standard penetration testing, and particle size analysis of the soil characteristics underlying the disposal area. Chemical testing included analyses for constituents that influenc"itrate loading. • To analyze the capacity of the indigenous soils to accept the anticipated wastewater flows, assess the characteristics of the soil to mitigate nitrate impact, and formulate operational parameters and design specifications to achieve the two goals of proper wastewater management and nitrate mitigation for the proposed filter bed disposal field. This was accomplished by the referenced testing, physical/chemical analyses and operational parameters incorporated into the design of the wastewater disposal system. • Analysis of the water table underlying the following: 1.) Proposed filter bed area to establish a baseline nitrate concentration, 2.) The existing leachfield that has served the Tracy Cold Storage facility for several decades, and 3.) The groundwater where a 100% reserve leachfield area was initially considered to be located, at the beginning of these studies. During the course of the testing and calculations, it was subsequently determined that the 100%reserve area could be situated directly northwest of the primary filter bed leachfield. Therefore, this initial reserve area to be in the southeast comer of the facility will now be used to store water tanks for fire suppression. Additionally, mounding potential was estimated under the primary filter bed to ensure sufficient treatment distance between the soil/effluent interface and the highest anticipated depth to groundwater. • Although wastewater flows emanating from the completed project are unknown, average daily flow volumes were formulated using all available parameters acceptable to EHD. 1 Chesney Consulting