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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 2 <br /> <br /> <br />1.2 PRESENT AND PAST USES OF THE SITE <br />Condor reviewed the USGS Manteca Quadrangle Map and historical aerial photographs provided by San <br />Joaquin County Surveyors Office to assess land use in the general area from 1937 to 1975. GoogleEarthTM <br />aerial photographs were reviewed for years 1993-2017 for more recent information. Based on historical <br />information, the area surrounding the site has been primarily agricultural with rural housing developments <br />prior to 1967. <br /> <br />The Site currently consists of French Camp Elementary School. The school was originally built in 1852 <br />and later rebuilt in 1967. An administration building, library, multipurpose room, and several classrooms <br />have been added or removed over the years for a total of 36 classrooms. Copies of historical aerial <br />photographs are included in Appendix B. <br /> <br />1.3 EXISTING AND PROPOSED SEPTIC TANK USAGE <br />1.3.1 Existing On-Site Septic Tank Usage <br />Condor Earth performed a search of the EHD website for records pertaining to existing septic tanks and <br />found references to two existing septic tanks onsite. According to historical permits, a functioning <br />3,800-gallon septic tank was installed in the western portion of property east of the library in December <br />1996, and a 4,000-gallon septic tank was installed in the north portion of the property north of the library <br />in May 2010. <br /> <br />1.3.2 Site Septic Permit History <br />Table 1 <br />Site Septic Permit History for Address 241 Fourth St. French Camp, CA <br />Date Permit # Type Tank 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 />--- --- Shown on SR0011256 Unknown 4? Unknown --- <br />--- --- Shown on SR0011256 6,000 6 Unknown --- <br />1996 SR0011256 Liquid Waste Permit Unknown <br />(old tank filled) NA NA --- <br />1996 SR0011256 Liquid Waste Permit 3,800 3 60 each --- <br />2010 SR0059994 <br />Onsite Wastewater <br />Treatment System <br />Permit <br />4,000 4 100 each --- <br /> <br /> <br />1.3.3 On-Site Septic Tank Repair History <br />In 1996, an on-site septic tank was destroyed by being filled in with pea gravel and replaced by a <br />3,800-gallon septic tank. Permit #SR0011256 shows a record of the tank replacement. <br /> <br />1.3.4 Existing Septic Tank Usage in The General Area <br />To assess septic system density for the vicinity of the Site, Google Maps aerial photos were reviewed to <br />gauge the number of residencies and agricultural land use. Based on over 70 buildings/residencies within <br />0.5 miles of the site it’s assumed that at least each building has one septic system. Refer to section 1.3.5 for <br />description of septic tanks in the general area. <br />