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Soil Suitability Nitrate Loading Study <br />Manteca Unified School District <br />5700 East Nile Ave., Manteca, CA <br />e're Page 3 <br />1.3.5 General Area Septic Permit History <br />Table 2, below, is a summary of septic permits available on the EHD website for properties adjacent to the <br />site. <br />Table 2 <br />Summary of Ad oinin Prone Septic Permits <br />Address Date Permit # <br />— <br />Type <br />Tank <br />Size <br />(Gallons) <br />Leach <br />Line <br />Quantity <br />Leach <br />Line <br />Length <br />(Feet) <br />Seepage <br />Pits/Sumps <br />Quantity/Size <br />(Feet) <br />5828 Nile Ave 2016 SR0076159 Leach Line <br />Addition --- 1 70 --- <br />5828 Nile Ave 1962 14972 Septic Tank 800 1 10 3x9x5 <br />5850 Nile Ave 1994 SR002394 Leach Line <br />Addition --- 1 40 4x10x8 <br />5850 Nile Ave 1962 14308 Septic Tank 800 2 30,40 3x9x5 <br />5898 Nile Ave 1963 16763 Septic tank 1200 2 Not legible 4x10x5 <br />5898 Nile Ave 2006 SR0047050 Septic Tank 2000 4 80 --- <br />5922 Nile Ave 1966 20497 Leach Line <br />Addition --- 1 60 --- <br />5261 Nile Ave 1967 22618 Septic Tank 1200 2 75 5x6x11 <br />Based on the review of EHD permits, the septic systems in the area appear to use leach lines between 10 <br />and 80 feet in length. Septic permit reports can be found in Appendix C. <br />1.3.6 General Area Septic Tank Repair History <br />Based on EHD permits there were not any septic tank repairs found in the immediate area, although leach <br />line additions were noted at several nearby addresses. <br />1.3.7 Proposed or Expected Maximum Septic Tank Usage on Site <br />MCR Engineering obtained a permit (SR0081029) to install an additional 6,000-gallon septic tank and <br />associated leach lines in the southeastern portion of the Site. The septic tank usage was calculated by MCR <br />Engineering and can be found in permit application number SR0081029. The total design average daily <br />flowrate is 6,378 gallons per day, which is based upon an average daily flowrate for the 3-room kindergarten <br />classroom building of 960 gallons per day (average occupancy of 32 at 10 gallons per person/day), an <br />average daily flowrate for the single room multi-purpose buildings of 5,418 gallons per day (average <br />occupancy of 375 at 10 gallons per person/day), and an average event flowrate for the multi-purpose <br />building of 1,668 gallons (occupancy of 834 at 2 gallons per person/day). The design parameter of 10 <br />gallons per person/day is based upon assumed use of low-flow fixtures. A copy of the engineered septic <br />design can be found in Appendix D. <br />1.4 GROUNDWATER INFORMATION <br />1.4.1 Depth and Gradient of Groundwater in the General Area <br />Subsurface conditions at the Site are available through geotechnical borings advanced by Condor on <br />November 11, 2018 as well as historical permit information obtained for the Site. During the November <br />11, 2018 exploration, groundwater was encountered at a depth of 10 feet below ground surface (bgs). <br />Groundwater was not encountered in percolation test holes excavated to a depth of 2 and 3 feet bgs by <br />CONDOR