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Soil Suitability Nitrate Loading Study Manteca Unified School District 14600 Austin Rd.,Manteca,California Page 3 Table 2 Summa of A(tioining Property Septic Permits Tank Leach Leach Seepage Address Date Permit# Type Size Line Line Pits/Sumps (Gallons) Quantity Length Quantity/Size (Feet) 14510 1993 93-0204 Septic Tank --- 1 40 4x8x 14 Austin Rd 14510 1974 SR0036791 Septic Tank 2,000 2 80 --- Austin Rd 14555 2006 SR0047808 Septic Tank 1,200 3 80 --- Austin Rd 14555 1974 74-24 Septic Tank 1,200 4 100 --- Austin Rd 14729 2012 SR0065975 Leach Line --- 2 80 --- Austin Rd 14729 1970 80-104 Leach Line 1 70 --- Austin Rd 14480 2012 SR0059253 Septic Tank 1,200 Austin Rd Based on the review of EHD permits, the septic systems in the area appear to use leach lines between 40 and 100 feet in length. Septic permit reports can be found in Appendix C of this report. 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 proposes to install an additional 5,000-gallon septic tank and associated leach lines in the south portion of the Site (Building H). The Proposed Leach Field "A" is designed as 7x100-feet lines and the Proposed Leach Field`B"is designed as 2x100-feet lines. Each proposed leach line includes 100% future reserve areas. The usage of the proposed new septic tank was calculated by MCR Engineering and can be found in Appendix D. 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 February 15,2019 as well as historical groundwater information obtained for the Site. During the February 15, 2019 exploration, groundwater was encountered at a depth of 45 feet below ground surface (bgs). Groundwater was not encountered in percolation test holes excavated to a depth of 2 and 3 feet bgs by Condor on October 10, 2019. Historical groundwater data available for the Site suggests groundwater has been as shallow as 10 feet bgs in the 1960s but has been steadily declining since that time. Based upon a review of nearby Leaking Underground Storage Tank (LUST) sites on the GeoTracker database, groundwater beneath the Site is expected to flow north to northwest. rs il? CONDOR