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Soil Suitability Nitrate Loading Study Manteca Unified School District 5700 East Nile Ave.,Manteca,CA �_`� Page 3 1.3.5 General Area Septic Permit History Cllr Table 2, below, is a summary of septic permits available on the EHD website for properties adjacent to the site. Table 2 Summa of Adjoining Property Septic Permits Tank Leach Leach Seepage Address Date Permit# Type Size Line Line Pits/Sumps (Gallons) Quantity Length Quantity/Size (Feet) (Feet) 5828 Nile Ave 2016 SR0076159 Leach Line 1 70 Addition 5828 Nile Ave 1962 14972 Septic Tank 800 1 10 3x9x5 5850 Nile Ave 1994 SR002394 Leach Line --- 1 40 4xlOx8 Addition 5850 Nile Ave 1962 14308 Septic Tank 800 2 30,40 3x9x5 5898 Nile Ave 1963 16763 Septic tank 1200 2 Not legible 4x10x5 5898 Nile Ave 2006 SR0047050 Septic Tank 2000 4 80 --- 5922 Nile Ave 1966 20497 Leach Line --- 1 60 --- Addition 5261 Nile Ave 1967 22618 Septic Tank 1200 2 75 5x6xl l Based on the review of EHD permits, the septic systems in the area appear to use leach lines between 10 and 80 feet in length. Septic permit reports can be found in Appendix C. 1.3.6 General Area Septic Tank Repair History Based on EHD permits there were not any septic tank repairs found in the immediate area, although leach line additions were noted at several nearby addresses. 1.3.7 Proposed or Expected Maximum Septic Tank Usage on Site MCR Engineering obtained a permit (SR0081029) to install an additional 6,000-gallon septic tank and associated leach lines in the southeastern portion of the Site. The septic tank usage was calculated by MCR Engineering and can be found in permit application number SR0081029. The total design average daily flowrate is 6,378 gallons per day,which is based upon an average daily flowrate for the 3-room kindergarten classroom building of 960 gallons per day (average occupancy of 32 at 10 gallons per person/day), an average daily flowrate for the single room multi-purpose buildings of 5,418 gallons per day (average occupancy of 375 at 10 gallons per person/day), and an average event flowrate for the multi-purpose building of 1,668 gallons (occupancy of 834 at 2 gallons per person/day). The design parameter of 10 gallons per person/day is based upon assumed use of low-flow fixtures. A copy of the engineered septic design can be found in Appendix D. 1.4 GROUNDWATER INFORMATION 1.4.1 Depth and Gradient of Groundwater in the General Area Subsurface conditions at the Site are available through geotechnical borings advanced by Condor on November 11, 2018 as well as historical permit information obtained for the Site. During the November 11, 2018 exploration, groundwater was encountered at a depth of 10 feet below ground surface (bgs). Groundwater was not encountered in percolation test holes excavated to a depth of 2 and 3 feet bgs by �i� CONDOR