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Existing and Proposed Septic Tank Usage Existing Septic System One septic system is currently located on the Site (Plate 2). Proposed Septic System Mr. Kimoto plans to install a new septic system for the new residence. On-Site Septic Permit History The San Joaquin County Environmental Health Department septic permit files were searched for the Site address. One permit was identified. The permit, dated November 1964, was for the addition of a 45-foot leach line with a 33-inch diameter by 25-foot deep seepage pit to the existing residential system. It has been included in Appendix 4 of this report. Existing Septic Tank Usage in the Vicinity To estimate the septic system usage in the area, our office counted septic systems that exist within approximately one square mile surrounding the property. Air photo imagery from Google Earth was used. Each building cluster on the photo was assumed to have one septic system. Using this method, it is estimated that at least 390 septic systems per square mile are located in the immediate vicinity of the Site; parcels that are part of the City of Stockton were excluded from the count. The Site is located within a mixed residential, agricultural, and commercial/light industrial area. A park is located to the south and west of the Site. Septic Permit History in the Vicinity Based on a review of septic permits on file at the San Joaquin County Environmental Health Department for nearby properties, most septic systems in the area utilize leach lines with 25-foot deep seepage pits, though one permit indicates an addition of leach lines only. The septic permits can be found in Appendix 4 of this report. Expected On-Site Maximum Septic Tank Usage Maximum expected usage on the Site would be from the future residents of the Site. Septic system design should be based on the San Joaquin County On-Site Wastewater Treatment Systems Standards (2017) or other engineering recommendations. LOGE 2115 Page 2