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• According to the San Joaquin County Community Development Department (www.co.san-joaquin.ca.us), the subject property is zoned I-L, Limited Industrial. This zoning designation "is intended to provide for light impact manufacturing, warehousing, wholesaling, construction contracting, and distribution uses. Activities within this zone have external physical effects that are generally restricted to the immediate area, are compatible with surrounding uses, are conducted entirely within closed buildings, and have outdoor storage areas that are screened." Existing and Proposed Septic Tank Usage Existing Septic System According to the site plan provided by HD Supply, the current septic system is located southeast of the existing warehouse (Plates 2 and 3). Proposed Septic System The site plan indicates an expansion of the existing septic system is planned; the leach field will be located south of the existing building and west of the proposed building. On-Site Septic Permit History The San Joaquin County Environmental Health Department septic permit files were • searched for the Site address. No permits were identified. 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 GoogleEarthTM was used. Each building cluster on the photo was assumed to have one septic system. Using this method, it is estimated that at least 70 septic systems per square mile are located in the immediate vicinity of the Site. The general area is a mixture of industrial warehouses, orchards, agricultural land, and rural residences. 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 seepage pits; one permit indicated that leach lines with sumps would be installed. The septic permits can be found in Appendix 4 of this report. • LOGE 1628 Page 2