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April 6, 2022 BGG No. G130.09C SITE DESCRIPTION The subject 1-acre site is identified as Assessor's Parcel Number (APN) 208-20-015. The site is located on the east side of Austin Road, approximately 300-feet north of Yosemite Avenue/California Highway 120,in Manteca,California. Several structures were formerly located at the site which were removed between 2008 and 2009 and the site is currently vacant and undeveloped. The relatively flat site has surface elevations of about 52 feet above mean sea level (MSL), according to Google Earth mapping.According to the San Joaquin County Community Development departing, the subject property is zoned R-VL, Very Low Density Residential. 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 east of the 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 immediate area surrounding the subject site consists primarily of low-density to medium-density residential properties. The area to the north of the site is predominantly in use for orchard tree agriculture and the area south of the site contains industrial and commercial facilities along Highway 120. 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 prof ect 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 70 to 80 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. BAEZ GEOTECHNICAL GROUP Soil Suitability Study and Nitrate Loading Study-Enriquez Residence,17650 Austin Road Page 2