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January 11, 2022 BGG No. G130.09B SITE DESCRIPTION The subject 0.74-acre site is identified as Assessor’s Parcel Number (APN) 228-020-480. The site is located on the west side of South Austin Road, approximately 800-feet south of Yosemite Avenue/California Highway 120, in Manteca, California. The site was previously vacant and undeveloped prior to construction for the new residence beginning. The relatively flat site has surface elevations of about 51 feet above mean sea level (MSL), according to Google Earth mapping. According to the City of Manteca Planning Division, the subject property is zoned R-E, Residential Estate. EXISTING AND PROPOSED SEPTIC SYSTEM USAGE Existing Septic System There are currently no septic systems located at the site. Proposed Septic System A new 1,500-gallon septic tank is proposed for the new residence, which will be located north of the proposed residence. On-Site Septic Permit History The San Joaquin County Environmental Health Department septic permit files were searched for the Site address. No septic system records or permit files were located; hence, it appears no septic systems are present or have been constructed at the site. Existing Septic Tank Usage in the Vicinity The general area surrounding the subject site consists primarily of commercial facilities to the immediate north, east, and west, with residential subdivisions north of Highway 120 and a mobile home community to the west of the site. The properties south of the subject site are predominantly in use for orchard tree agriculture with ranch residences located throughout. To estimate the septic system usage in the area, we used professional judgement to identify potential septic systems that exist within approximately one square mile surrounding the project site. Google Earth imagery was utilized. Each building cluster on the photo was assumed to have one septic system, and sites perceived to be used for commercial or industrial purposes were assumed to have two septic systems. Sites within improved residential areas perceived to be connected to a municipal wastewater collection system were assumed to have no septic systems. Using this method, it is estimated that approximately 50 to 60 septic systems per square mile are located in the immediate vicinity of the site. Septic Permit History in the Vicinity A review of septic permits on file with the San Joaquin County Environmental Health Department for nearby properties indicated that most septic systems in the area utilize leach lines. Expected On-Site Maximum Septic Tank Usage Maximum expected usage for the proposed onsite septic system will be from the residents of the proposed residence. Septic system design should be based on the San Joaquin County On-Site Wastewater Treatment Systems Standards (2017) or other engineering recommendations.