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Addendum Revised Soil Suitability Nitrate Loading Study <br />Manteca Unified School District <br />241 4th Street, French Camp, CA <br />Page 3 <br /> <br /> <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 /> <br /> <br />Address Date Permit # 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 />170 E. 2nd <br />Street 1986 86-923 Septic Tank 1,200 3 70 --- <br />7411 Elm <br />Street 1992 92-3817 Septic Tank 1,600 2 100 8x4x12 <br />7421 Elm <br />Street 1993 93-1039 Septic Tank 1,200 3 61, 43, 37 8x4x8 <br />341 French <br />Camp <br />Road <br />1994 SR0004981 Septic Tank 1,200 1 40 15x4x6 <br />7437 S <br />Elm Street 2005 SR0044498 Septic Tank 1,200 --- --- --- <br />7515 Elm <br />Street 2005 SR0044499 Septic Tank 1,200 --- --- --- <br />301 French <br />Camp <br />Road <br />2005 SR0043682 Septic Tank 1,800- <br />2,000 --- --- --- <br /> <br />Based on the review of EHD permits, the septic systems in the area appear to use leach lines between 37 <br />and 100 feet in length. Septic permit reports can be found in Appendix C of this report. <br /> <br />1.3.6 General Area Septic Tank Repair History <br />Based on EHD permit review of the surrounding area, permit #SR0004981 shows there was a <br />repair/addition of a 1,200-gallon septic tank at 341 S. French Camp Road, which is a three-bedroom <br />residence. <br /> <br />1.3.7 Proposed or Expected Maximum Septic Tank Usage on Site <br />The septic system usage was calculated by MCR Engineering with average daily flow rates estimated at <br />1,509 gallons per day, based on an average occupancy of 644 students/faculty at 5 gallons per person/day <br />for 180 days, and a 95% attendance rate. The septic design plot plan is shown on Figure 3 (Appendix A). <br /> <br />1.4 GROUNDWATER INFORMATION <br />1.4.1 Depth and Gradient of Groundwater in the General Area <br />Subsurface conditions at the Site were determined through geotechnical borings advanced by Condor on <br />April 12, 2019 as well as historical permit information obtained for the Site. During the April 12, 2019 <br />exploration, groundwater was encountered at a depth of approximately 26 feet below ground surface (bgs), <br />but subsequently rose to a depth of approximately 20.5 feet within the hollow stem augers. Groundwater <br />was not encountered in percolation test holes excavated to a depth of 2 and 3 feet bgs on June 25, 2019. <br /> <br />Table 2 <br />Summary of Adjoining Property Septic Permits