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I. INTRODUCTION This report is an Addendum to a study and design report completed in June 1999 for the Gurdwara Gur Nanak Parkash Sikh Temple facility on West Grant Line Road in Tracy. This Addendum was required by the San Joaquin County Environmental Health Department(EHD)to comply with the San Joaquin County Development Title, specifically Section 9-1105.2(d)and includes the required Nitrate Loading Study,Soil i Suitability Study and Wastewater Disposal Operational and Design Parameters for the proposed Temple expansion. Mr. Sukhjit"Tony" Singh is the Project Manager for the Sikh Temple expansion plans and has provided the preliminary information to complete these studies.The Site Plan and associated civil engineering information have been produced by Mr. Singh's firm,Continental Development Corporation of Las Vegas,Nevada. Typically for Nitrate Loading and Soil Suitability Studies(NLS/SSS), Bolded Section(§)numbers are referenced at the beginning of an applicable Paragraph or Paragraphs that co�e EHD Requirements Checklist for these Studies. However,since this document is Addendum the original NLS/SSS,the END p_mgao Manager has waived this requirement. The Sikh Temple is located approximately 1.5 miles southeast of the town of Mountain House. Since City sewer has not expanded to this area, the Temple must operate with an on-site decentralized wastewater management(septic)system. Since the water table is approximately five ft below grade and the on-site soils are composed of a dense clay soil structure,a new mound system must be installed. A mound system was designed and installed in 1999/' 11 Domestic water will be supplied by the on-site domestic well. It will be a number of decades before Mountain House or the City of Tracy services such as water,sewer and stormwater management will be available at the west end of Grant Line Road, east of Mountain House Parkway. 1� As noted, wastewater system operational and design parameters are also presented within this report to facilitate the transfer of information to EHD. The purposefthese Studies was to collect the following information to fulfill the requirements of the EHD: • L)To analyze the capacity of the indigenous soils in the proposed disposal area to accept the anticipated wastewater flows,2.)Assess the characteristics of the soil to mitigate nitrate impact, and 3.)Discuss operational parameters to achieve the two goals of proper wastewater management and nitrate loading mitigation from the mound disposal system. This was accomplished by the referenced testing,physical/chemical analyses and operational parameters incorporated into the design of the wastewater disposal system. • Conducted soil physical testing to determine the following: Physical testing included percolation testing to determine the permeability of the soil characteristics underlying the proposed effluent disposal area. • Mounding Analyses of the water table underlying the proposed mound system location has been calculated for this project. • As illustrated on the Site Plan,the primary disposal mound area and the required 100% reserve/replacement/addition area are situated directly north of the existing,and future development of the Sikh Temple. • Wastewater flow volumes emanating from the completed project have been based upon the highest Average Daily Flow(ADF)volumes potentially possible. 1