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In summary,the soils testing and investigation has found the indigenous soils under the proposed domestic wastewater disposal area,which is to be directly west of the new modular office building,to contain a predominately fine-grained sandy silt material with some clay. This soil has excellent permeability characteristics with some nitrate mitigation capabilities. Due to the shallow(high)groundwater table,the soil-effluent interface shall be no deeper than 24 inches below existing grade. II. SOIL SUITABILITY STUDY FINDINGS A. SUBJECT PROPERTY AND SURROUNDING STUDY AREA INFORMATION SSS§ 1.1. As noted on the San Joaquin County Parcel Viewer Maps,the current surrounding land use is composed primarily of agricultural production land,horse ranches, an egg-laying ranch,and very low density residential structures and ranchettes. Surrounding land has been in agricultural production for many decades. New development within the City of Lathrop has occurred further to the south. Approximately one-half mile to the west of the site is the San Joaquin River. The property is zoned AG# with no proposal for a zone reclassification. SSS§3.1,3.2,3.3,3.4,3.5,3.6. Applications on file with EHD reveal that there haven two pe 'ts issued for repairs/additions to existing systems within a one-half mile surrounding the p ject sit as j illustrated in the following Table: TABLE 1 Permit Number Address Permit Date Repair 69-1047 616 West Frewert 12/69 Add 60 ft of leach line 87-261 616 West Frewert 2/87 Add one 90 ft leach line The project site has relatively level terrain; consequently,there will be no ed to incorporate design considerations for slopes within the wastewater disposal area. Since th w modular building will be raised, there will be an approximate two-foot elevational difference between the influent line leaving the building and the septic tank and the effluent disposal piping network. B. SOIL PHYSICAL CHARACTERISTICS AND ANALYTICAL TEST RESULTS SSS§5.2.The United States Department of Agrice-So' Conservation Service(USDA-NRCS)indicates the majority of the on-site soils to consist of Gmngevfllc clay oam(#167). As referenced by the NRCS, the surface layer is typically a grayish bro clay loam abo 6 inches thick. Below this stratum is a fme- to-medium sandy loam,which was encounte a remaining soil depth to 60 inches is also a sandy loam, r which was also observed and confirmed by the percolation test results. Rust mottling was not.observed in the percolation test borings which would indicate seasonal soil saturation. NLS§ 1.1, 1.2. As noted on the Denele Laboratory Soil Analysis Reports foanc(ifi Appendix�B emical analyses of the soil samples from the disposal area quantify the constituents tha¢fwi11-i ce ritrate loadinc from this project. The important parameters for nitrate loading assessment are the organic matter,pH,cation exchange capacity(CEC),and nitrate-nitrogen content. 2