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7report DUCTION \ es our findings for the proposed St Bernard's Catholic Church Multipurpose ing the Nitrate Loading Study, Soil Suitability Study and Domestic Wastewater Management Design Criteria. 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). In September 2003, Chesney Consulting completed a Wastewater Disposal System Study consisting of a Nitrate Loading Study, Soil Suitability Study and Preliminary Design Criteria for the proposed St. Bernard's Church Complex, in its entirety. The Church Complex was at that time, and is eventually to consist of the following: The Church Worship Assembly Sanctuary, Church Support Buildings, The Multipurpose Building, and a K-8 Grade School. Due to a number of constraints placed on complete development of the Church Complex (partially due to deficient wastewater disposal area for the entire project)precipitated the need for St. Bernard's Church to develop the Multipurpose Building as "Phase I" exclusively. When City of Tracy services(water, and particularly sewer), reach the subject property, the Church will continue with its original plans for complete development in seven phases. This time frame is presently unknown,but is assumed to be within five years. Currently, a City sewer trunk line is approximately 0.4 miles north of the intersection of Valpico Road and Corral Hollow Road. In accordance with EHD's request, the original 2003 Wastewater Disposal System Study document is being submitted to them as the "Primary Report" for this project, and will be referenced as such in this Report. This Multipurpose Building Report is being submitted to EHD as an "Addendum" to the original 2003 document. The Primary Report should be read and examined first before reading this Report. The purpose of these Studies was to collect the following information and fulfill EHD requirements for specifying the wastewater management system design and operational parameters for the on-site wastewater system to serve the St. Bernard's Multipurpose Building: • Conduct soil physical and chemical testing: Physical testing included percolation testing and particle size analysis of the soil characteristics underlying the exact disposal area. Chemical testing included analyses for constituents that influence nitrate loading potential. • Analyze the capacity of the soils in the disposal area to accept the anticipated wastewater flows, assess the characteristics of the anticipated effluent, and discuss the soil characteristics to mitigate nitrate impact. Formulate operational parameters and design specifications to achieve the two goals of proper wastewater management and nitrate mitigation from 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. M • Although wastewater flow volumes and precise characteristics emanating from the Multipurpose Building are presently unknown, average daily flow(ADF)volumes were formulated using all available parameters acceptable to EHD. Page -1- Chesney Consulting