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Fexisting septic system is unacceptable to EHDhecause the disposal area is undersized he proposed usage, and the existing leachline is currently being drivenover. Thereforew effluent disposal area must be perc tested and denoted on the site plans. ✓ Investigate the physical and chemical soil characteristics of the proposed effluent disposal area, along with percolation testing in the primary disposal. area. ✓ Test the current nitrate and Total Alkalinity concentrations within the underlying groundwater by analyzing the on-site well water that is to be used for this project. Discuss Total Alkalinity within the domestic water as it relates to nitrate loading. ✓ Identify past and present sources of nitrate impacting the underlying groundwater and discuss impact from upgradient septic systems and historical upgradient agricultural production that may have contributed to the nitrate concentration in the underlying groundwater. ✓ Discuss mitigation measures to alleviate nitrate loading from the septic system proposed for this development. II. SOIL SUITABILITY STUDY FINDINGS A. SUBJECT PROPERTY AND SURROUNDING STUDY AREA INFORMATION Thep roperty is bound to the north by open land which was a former drive-in theater, and industrial properties. To the south are also commercial and industrial facilities, along with a mobile home park. To the west is the Highway 99 freeway, commercial properties and new residential developments. To the east is agricultural production land. The surrounding land use to the north, south, east and west of the project site has evolved and developed over in the past number of decades. The United States Department of Agriculture (USDA) Soil Map of San Joaquin County for this area, produced in the 1970s illustrates the area around the subject property to be rural, predominately open agricultural land, except for the referenced mobile home park and drive-in theater. Phase I of the subject property presently contains the buildings referenced on the Site Plan, which include two metal barn structures, the residential structure to be converted to an office and portable containers. There is also tractor/trailer parking. Applications on file with the County Environmental Health Department reveal there has been one permit issued for the subject property itself, and a permit issued for a property one-quarter mile north, both permits for supplemental drainage. The schematic attached to the subject property permit shows the layout of the existing system, which was determined by EHD to be non-viable. The addition of a seepage pit on the subject property reinforces the premise that seepage pits should be installed for this project. This also indicates that the shallow surface soils are marginally conducive for the long- term management of septic effluent due to poor permeability characteristics. 2 Chesney Consulting