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January 21, 2021 BGG Job No. G130.09 Mariposa Road, in Stockton, California. The site is currently vacant and undeveloped. Several stockpiles of soil, concrete, asphalt, and landscape materials were observed in the northern portion of the property at the time of our field percolation testing. The relatively flat site has surface elevations of about 22 to 24 feet above mean sea level (MSL), according to Google Earth mapping. According to the San Joaquin County Community Development Department, the subject property is zoned R -L, 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 1,200 -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. A record for Permit No. SR0082692, dated 10-05-2020, was obtained for the subject site, which was for a percolation test permit. No other septic permit files were located; hence, it appears no septic systems are present or have been constructed at the site. A record of the SJCEHD percolation test permit is contained in Appendix A. Existing Septic Tank Usage in the Vicinity The general area surrounding the subject site consists primarily of residences to the south, agricultural crop land to the east, and commercial and industrial use to the north and west. 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. Using this method, it is estimated that approximately 90 to 100 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 - Valdovinos Residence Page 2